terminology update

author: Philip Lampkin <plampkin@chem.wisc.edu> 2021-04-24 12:07:04 -0500
committer: Philip Lampkin <plampkin@chem.wisc.edu> 2021-04-24 12:07:04 -0500
commit: 40ab1463c3da0c844eedba5c5f52d5ef8af322c4 (patch)
tree: d7984802dbe72f0d203d7b86372ca355ac0c833d /digital-driver/firmware
parent: d6df6a65cf04da7ed29e8f09c0bf14c8b2cfb2e6 (diff)
28 files changed, 0 insertions, 4005 deletions
diff --git a/digital-driver/firmware/TinyWire-master.zip b/digital-driver/firmware/TinyWire-master.zip
deleted file mode 100644
index 081f1a5..0000000
--- a/digital-driver/firmware/TinyWire-master.zip
+++ /dev/null
diff --git a/digital-driver/firmware/TinyWire-master/README.md b/digital-driver/firmware/TinyWire-master/README.md
deleted file mode 100644
index 46a5ef2..0000000
--- a/digital-driver/firmware/TinyWire-master/README.md
+++ /dev/null
@@ -1,25 +0,0 @@
-# Arduino TinyWire Slave Library
-
-Originals from <http://www.arduino.cc/playground/Code/USIi2c>
-
-Modified to support ATtiny44/84
-
-## NOTE about reliable communication
-
-Since (most of) the ATTinys lack TWI module for implementing all the nitty-gritty of I2C in hardware
-they will have to do some clock-stretching (at least if run at 8MHz, you may get away with more on higher clock speeds)
-as specified in the I2C protocol. However some (especially "bit-banged") master implementations do not
-support clock-streching (looking at you Bus pirate 3.x and [RPI][rpibug]), you will not get reliable communication
-unless your master supports the full I2C protocol spec. There is a [library][pigpio] which can bit-bang I2C correctly on RPI, use that instead of the [buggy hardware][rpibug] (thanks to @brendanarnold for [that tip][pigtip]).
-
-You can use my [Arduino based I2C master][i2crepl] to test your TinyWire code, this uses Bus Pirate semantics
-with Arduinos TWI hardware that is known to implement I2C properly.
-
-[i2crepl]: https://github.com/rambo/I2C/blob/master/examples/i2crepl/i2crepl.ino
-[rpibug]: http://www.advamation.com/knowhow/raspberrypi/rpi-i2c-bug.html
-[pigpio]: http://abyz.co.uk/rpi/pigpio/python.html#bb_i2c_zip
-[pigtip]: https://github.com/rambo/TinyWire/issues/14#issuecomment-125325081
-
-## delayMicroseconds
-
-See this issue: <https://github.com/rambo/TinyWire/issues/8> (remember to declare the function void if you copy-paste it verbatim)
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/TinyWireS.cpp b/digital-driver/firmware/TinyWire-master/TinyWireS/TinyWireS.cpp
deleted file mode 100644
index 783e8e7..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/TinyWireS.cpp
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
-  TinyWireS.cpp - a wrapper class for Don Blake's usiTwiSlave routines.
-  Provides TWI/I2C Slave functionality on ATtiny processers in Arduino environment.
-  1/23/2011 BroHogan -  brohoganx10 at gmail dot com
-
-  **** See TinyWireS.h for Credits and Usage information ****
-
-  This library is free software; you can redistribute it and/or modify it under the
-  terms of the GNU General Public License as published by the Free Software
-  Foundation; either version 2.1 of the License, or any later version.
-  This program is distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-  PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-*/
-
-extern "C" {
-  #include <inttypes.h>
-  #include "usiTwiSlave.h"
-  #include <avr/interrupt.h>
-  }
-
-#include "TinyWireS.h"
-#include "Arduino.h"
-
-// Constructors ////////////////////////////////////////////////////////////////
-
-USI_TWI_S::USI_TWI_S(){
-}
-
-
-// Public Methods //////////////////////////////////////////////////////////////
-
-void USI_TWI_S::begin(uint8_t slaveAddr){ // initialize I2C lib
-  usiTwiSlaveInit(slaveAddr); 
-}
-
-void USI_TWI_S::send(uint8_t data){  // send it back to master
-  usiTwiTransmitByte(data);
-}
-
-uint8_t USI_TWI_S::available(){ // the bytes available that haven't been read yet
-  return usiTwiAmountDataInReceiveBuffer(); 
-  //return usiTwiDataInReceiveBuffer(); // This is wrong as far as the Wire API is concerned since it returns boolean and not amount
-}
- 
-uint8_t USI_TWI_S::receive(){ // returns the bytes received one at a time
-  return usiTwiReceiveByte(); 
-}
-
-// sets function called on slave write
-void USI_TWI_S::onReceive( void (*function)(uint8_t) )
-{
-  usi_onReceiverPtr = function;
-}
-
-// sets function called on slave read
-void USI_TWI_S::onRequest( void (*function)(void) )
-{
-  usi_onRequestPtr = function;
-}
-
-// This routine is no longer used now that the usiTwiSlave is completely
-// interrupt driven. The function is maintained here so that programs
-// written for the pre-interrupt driven version will still compile and function.
-void TinyWireS_stop_check()
-{
-  // empty functions
-}
-
-// Implement a delay loop that checks for the stop bit (basically direct copy of the stock arduino implementation from wiring.c)
-// I don't think this function is necessary now that the 
-// usiTwiSlave is completely interrupt driven. I'm not sure, and the function is 
-// behaviorally harmless because TinyWireS_stop_check() is empty, so I'm leaving it alone.
-void tws_delay(unsigned long ms)
-{
-    uint16_t start = (uint16_t)micros();
-    while (ms > 0)
-    {
-        TinyWireS_stop_check();
-        if (((uint16_t)micros() - start) >= 1000)
-        {
-            ms--;
-            start += 1000;
-        }
-    }
-}
-
-// Preinstantiate Objects //////////////////////////////////////////////////////
-
-USI_TWI_S TinyWireS = USI_TWI_S();
-
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/TinyWireS.h b/digital-driver/firmware/TinyWire-master/TinyWireS/TinyWireS.h
deleted file mode 100644
index ccef042..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/TinyWireS.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
-  TinyWireS.h - a wrapper class for Don Blake's usiTwiSlave routines.
-  Provides TWI/I2C Slave functionality on ATtiny processers in Arduino environment.
-  1/23/2011 BroHogan -  brohoganx10 at gmail dot com
-
-  Major credit and thanks to Don Blake for his usiTwiSlave code which makes this possible
-  http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=51467&start=all&postdays=0&postorder=asc
-  (Changed #define USI_START_COND_INT  USISIF (was USICIF) in usiTwiSlave.h)
-
-  NOTE! - It's very important to use pullups on the SDA & SCL lines! More so than with the Wire lib.
-  Current Rx & Tx buffers set at 32 bytes - see usiTwiSlave.h
- 
- USAGE is modeled after the standard Wire library . . .
-  Put in setup():
-	TinyWireS.begin(I2C_SLAVE_ADDR);                 // initialize I2C lib & setup slave's address (7 bit - same as Wire)
-
-  To Receive:
-    someByte = TinyWireS.available(){                // returns the number of bytes in the received buffer
-    someByte = TinyWireS.receive(){                  // returns the next byte in the received buffer
-
-  To Send:
-	TinyWireS.send(uint8_t data){                    // sends a requested byte to master
-	
-  TODO:	(by others!)
-	- onReceive and onRequest handlers are not implimented.
-	- merge this class with TinyWireM for master & slave support in one library
-	
-  This library is free software; you can redistribute it and/or modify it under the
-  terms of the GNU General Public License as published by the Free Software
-  Foundation; either version 2.1 of the License, or any later version.
-  This program is distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-  PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-*/
-
-#ifndef TinyWireS_h
-#define TinyWireS_h
-
-#include <inttypes.h>
-
-
-class USI_TWI_S
-{
-  private:
-	//static uint8_t USI_BytesAvail;
-	
-  public:
- 	USI_TWI_S();
-    void begin(uint8_t I2C_SLAVE_ADDR);
-    void send(uint8_t data);
-    uint8_t available();
-    uint8_t receive();
-    void onReceive( void (*)(uint8_t) );
-    void onRequest( void (*)(void) );
-};
-
-void TinyWireS_stop_check();
-// Implement a delay loop that checks for the stop bit (basically direct copy of the stock arduino implementation from wiring.c)
-void tws_delay(unsigned long);
-
-extern USI_TWI_S TinyWireS;
-
-#endif
-
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/avr_usi_i2c_master.pdf b/digital-driver/firmware/TinyWire-master/TinyWireS/avr_usi_i2c_master.pdf
deleted file mode 100644
index dc8f460..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/avr_usi_i2c_master.pdf
+++ /dev/null
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/avr_usi_i2c_slave.pdf b/digital-driver/firmware/TinyWire-master/TinyWireS/avr_usi_i2c_slave.pdf
deleted file mode 100644
index e4704c7..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/avr_usi_i2c_slave.pdf
+++ /dev/null
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/TinyWireS_Stress_Master/TinyWireS_Stress_Master.ino b/digital-driver/firmware/TinyWire-master/TinyWireS/examples/TinyWireS_Stress_Master/TinyWireS_Stress_Master.ino
deleted file mode 100644
index d50adb7..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/TinyWireS_Stress_Master/TinyWireS_Stress_Master.ino
+++ /dev/null
@@ -1,184 +0,0 @@
-// ---------------------------------
-// Stress test program/example for TinyWireS I2C library.
-// Run this master program on the Arduino Uno R3.
-// Run the other slave program on the Attiny.
-// ---------------------------------
-// Written by Scott Hartog, 2/6/2016
-// This is the I2C master program which runs on on a regular Arduino
-// (not a AtTiny). This program uses the regular Wire library from the Arduino IDE.
-//
-// It performs these steps in a loop:
-//    1. picks a random number of bytes between 1 and 12
-//    2. sends that many bytes of random data to the AtTiny slave within
-//       a single Wire.beginTransmission() / Wire.write() / Wire.endTransmission() set
-//    3. reads that same number of bytes back with a single Wire.requestFrom() call
-//    4. compares the received data to the originally transmitted data
-//    5. displays the number of requests, number of requests with mismatches,
-//       and enough of the data so that the operator can tell it's working.
-//
-#include <Wire.h>
-
-// BREADBOARD SETUP:
-// Arduino Uno R3 (D18/SDA) = I2C SDA 
-//     connect to SDA on slave with external pull-up (~4.7K)
-// Arduino Uno R3 (D19/SCL) = I2C SCL 
-//     connect to SCL on slave with external pull-up (~4.7K)
-// Arduino Uno R3 (D2)
-//     connect to !RST on slave
-//     Can alternatively connect !RST on slave to the Ardiuno "!RESET" pin
-
-#define I2C_SLAVE_ADDR  0x26            // i2c slave address (38, 0x26)
-
-#if defined(ESP8266)
-  // pins that work for Monkey Board ESP8266 12-E
-  // SCL=5, SDA=4
-  #define SLAVE_RESET_PIN 2
-  #define ALL_OK_LED_PIN 16
-  #define OK_LED_PIN 14
-  #define ERROR_LED_PIN 13
-#else
-  // pins that work for Micro Pro, Uno, Mega 2560
-  // reference documentation for SCL and SDA pin locations
-  // Uno SDA=D18, SCL=D19
-  #define SLAVE_RESET_PIN 6
-  #define ALL_OK_LED_PIN 9
-  #define OK_LED_PIN 7
-  #define ERROR_LED_PIN 8
-#endif
-
-uint16_t count = 0;       // total number of passes so far
-uint16_t error_count = 0; // total errors encountered so far
-
-char c_buf[64]; // for creating messages
-
-void setup()
-{
-  // set pin modes 
-  pinMode(SLAVE_RESET_PIN,OUTPUT);  // active low reset to slave device
-  pinMode(OK_LED_PIN,OUTPUT);       // indicates last transaction matched
-  pinMode(ALL_OK_LED_PIN,OUTPUT);   // indicates all transactions so far have matched
-  pinMode(ERROR_LED_PIN,OUTPUT);    // indicates last transaction mismatched
-
-  // init the serial port
-  Serial.begin(9600);
-
-  // print some useful pinnout info for the Arduino
-  //Serial.println(String("SCL:")+String(SCL)+String(", SDA:")+String(SDA));
-  //Serial.println(String("MOSI:")+String(MOSI)+String(", SCK:")+String(SCK));
-
-  // init the Wire object (for I2C)
-  Wire.begin(); 
-
-  // init the i2c clock
-  // default is 100kHz if not changed
-  // Wire.setClock(400000L);  // 400kHz
-  
-  // reset the slave
-  digitalWrite(SLAVE_RESET_PIN, LOW);
-  delay(10);
-  digitalWrite(SLAVE_RESET_PIN, HIGH);
-
-  // set the all okay pin high
-  digitalWrite(ALL_OK_LED_PIN, HIGH);
-  
-  // wait for slave to finish any init sequence
-  delay(2000);
-}
-
-void loop()
-{
-  uint8_t i;
-  uint8_t req_rtn;       // num bytes returned by requestFrom() call
-  uint8_t rand_byte_count;
-  uint8_t out_rand[16];  // data written from master
-  uint8_t in_rand[16];   // data read back from slave
-
-  bool mismatch;
-
-  // count total number of request
-  count++;
-
-  // compute random number of bytes for this pass
-  rand_byte_count = random(16) + 1;
-
-  // force the first three requests to be small so that the tx buffer doesn't overflow
-  // instantly and the user can see at least one successful transaction and some
-  // mismtaches before the usiTwiSlave.c library hangs on the line "while ( !txCount );".
-  if (count <= 3) rand_byte_count = 2;
-
-  // generate, save, and send N random byte values
-  Wire.beginTransmission(I2C_SLAVE_ADDR);
-  for (i = 0; i < rand_byte_count; i++)
-    Wire.write(out_rand[i] = random(256));
-  Wire.endTransmission();
-  
-  // delay 20 milliseconds to accomodate slave onReceive() callback
-  // function. The actual time that slave takes is application dependent, but
-  // just storing the master's transmitted data does not take
-  // anywhere near 20ms.
-  delay(20);
-  
-  // read N bytes from slave
-  req_rtn = Wire.requestFrom(I2C_SLAVE_ADDR, (int)rand_byte_count);      // Request N bytes from slave
-  for (i = 0; i < req_rtn; i++)
-    in_rand[i] = Wire.read();
-
-  // compare in/out data values
-  mismatch = false;
-  for (i = 0; i < rand_byte_count; i++)
-    mismatch = mismatch || (out_rand[i] != in_rand[i]);
-
-  // increment the error counter if the number of byte variables don't match or
-  // if the data itself doesn't match
-  if (mismatch || (rand_byte_count != req_rtn)) 
-  {
-    error_count++;
-    digitalWrite(ERROR_LED_PIN, HIGH);
-    digitalWrite(OK_LED_PIN, LOW);
-    // If there's ever an error, reset the ALL_OK_LED
-    // and it is not set again until the master resets.
-    digitalWrite(ALL_OK_LED_PIN, LOW);
-  }
-  else
-  {
-    digitalWrite(ERROR_LED_PIN, LOW);
-    digitalWrite(OK_LED_PIN, HIGH);
-  }
-
-  // The rest of the program just displays the results to the serial port
-  
-  // display total requests so far and error count so far
-  snprintf(c_buf, sizeof(c_buf), "req: %3d,err: %3d", count, error_count);
-  Serial.println(c_buf);
-
-  // display the random byte count, the number of bytes read back, and "MATCH"/"MISMATCH"
-  snprintf(c_buf, sizeof(c_buf), "size: %2d/%2d,%s", rand_byte_count, req_rtn, rand_byte_count != req_rtn?"MISMATCH  <<--- !!!":"MATCH");
-  Serial.println(c_buf);
-  
-  // display whether the data compare matched or mismatched
-  snprintf(c_buf, sizeof(c_buf), "data: %s", mismatch?"MISMATCH  <<--- !!!":"MATCH");
-  Serial.println(c_buf);
-
-  // send up to three tx/rx bytes so that random data can be
-  // visually verified
-  if (rand_byte_count >= 1)
-  {
-    snprintf(c_buf, sizeof(c_buf), "rand[0]: %02x/%02x", out_rand[0], in_rand[0]);
-    Serial.println(c_buf);
-  }
-
-  if (rand_byte_count >= 2)
-  {
-    snprintf(c_buf, sizeof(c_buf), "rand[1]: %02x/%02x", out_rand[1], in_rand[1]);
-    Serial.println(c_buf);
-  }
-
-  if (rand_byte_count >= 3)
-  {
-    snprintf(c_buf, sizeof(c_buf), "rand[2]: %02x/%02x", out_rand[2], in_rand[2]);
-    Serial.println(c_buf);
-  }
-
-  // delay 1 second so user can watch results
-  delay(1000);
-}
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/TinyWireS_Stress_Slave/TinyWireS_Stress_Slave.ino b/digital-driver/firmware/TinyWire-master/TinyWireS/examples/TinyWireS_Stress_Slave/TinyWireS_Stress_Slave.ino
deleted file mode 100644
index c7fbe41..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/TinyWireS_Stress_Slave/TinyWireS_Stress_Slave.ino
+++ /dev/null
@@ -1,143 +0,0 @@
-// ---------------------------------
-// Stress test program/example for TinyWireS I2C library.
-// Run this slave program on the Attiny.
-// Run the other master program on the Arduino Uno R3.
-// ---------------------------------
-// // Written by Scott Hartog, 2/6/2016, to stress test the TinyWireS library.
-// https://github.com/rambo/TinyWire
-//
-// This project uses the Tiny85 as an I2C slave.
-//
-// The slave program using TinyWireS, running on a Attiny85, receives
-// N bytes of random data in a single receiveEvent() callback and
-// stores that data in a global buffer. It then responds the first requestEvent()
-// callback with that same data. The requestEvent() callback overwrites the data
-// buffer with zeros after responding so it will only respond correctly to the
-// first requestEvent() callback after each receiveEvent() callback. Subsequent
-// requestEvent() will respond with 0xff for all data bytes.
-//
-//
-// SETUP:
-// AtTiny Pin 5 (PB0/SDA) = I2C SDA 
-//     connect to SDA on master with external pull-up (~4.7K)
-// AtTiny Pin 7 (PB0/SCL) = I2C SCL 
-//     connect to SCL on master with external pull-up (~4.7K)
-// AtTiny Pin 1 (PB5/!RST)
-//     connect to reset on master (or just pull-up)
-//
-// Please see credits and usage for usiTwiSlave and TinyWireS in the .h files of 
-// those libraries.
-
-#include <avr/sleep.h>
-#include <avr/wdt.h>
-#include "TinyWireS.h"                  // wrapper class for I2C slave routines
-
-#define I2C_SLAVE_ADDR  0x26            // i2c slave address (38, 0x26)
-
-// turns on code that makes the Tiny85 sleep between transactions
-// This is optional. The Tiny85 current drops from
-// about 2mA to about 20uA when the CPU is put into
-// PowerDown sleep mode.
-#define USE_CPU_SLEEP
-
-// global buffer to store data sent from the master.
-uint8_t master_data[16];
-// global variable to number of bytes sent from the master.
-uint8_t master_bytes;
-
-// Gets called when the ATtiny receives an i2c write slave request
-// This routine runs from the usiTwiSlave interrupt service routine (ISR)
-// so interrupts are disabled while it runs.
-void receiveEvent(uint8_t num_bytes)
-{
-  uint8_t i;
-
-  // save the number of bytes sent from the master
-  master_bytes = num_bytes;
-
-  // store the data from the master into the data buffer
-  for (i = 0; i < master_bytes; i++)
-    master_data[i] = TinyWireS.receive();
-    
-}
-
-// Gets called when the ATtiny receives an i2c read slave request
-// This routine runs from the usiTwiSlave interrupt service routine (ISR)
-// so interrupts are disabled while it runs.
-void requestEvent()
-{
-  uint8_t i;
-  
-  // send the data buffer back to the master
-  for (i = 0; i < master_bytes; i++)
-    TinyWireS.send(master_data[i]);
-
-  // corrupt the byte values in the data buffer
-  // so that any subsequent call won't match
-  for (i = 0; i < master_bytes; i++)
-    master_data[i] += 0x5a;
-
-  // corrupt length of the request, but don't make it zero
-  
-  // if the usiTwiSlave.c is working fine, then this number is completely irrelevant
-  // because the requestEvent() callback will not be called again until
-  // after the next receiveEvent() callback, so the master_data and
-  // master_bytes variables will be overwritten by that call.
-
-  // If the usiTwiSlave.c has the issue of calling the requestFrom() callback
-  // for each byte sent, the buffer will accumulate by this amount *for each byte
-  // in the original request*. (This problem is fixed in the recent version.)
-  // 
-  // Making it zero will obscure the 1-byte send issue in the usiTwiSlave.c
-  // that is being tested.
-  // Making it small will allow a few requests to succeed before the tx buffer
-  // overflows and the usiTwiSlave.c hangs on the "while ( tmphead == txTail );"
-  // line
-  master_bytes = 2; 
-}
-
-void setup()
-{
-  //pinMode(1,OUTPUT);   // This pin can be used for rudimentary debug
-  
-  // initialize the TinyWireS and usiTwiSlave libraries
-  TinyWireS.begin(I2C_SLAVE_ADDR);      // init I2C Slave mode
-
-  // register the onReceive() callback function
-  TinyWireS.onReceive(receiveEvent);
-  
-  // register the onRequest() callback function
-  TinyWireS.onRequest(requestEvent);
-
- // disable the watchdog timer so that it doesn't
-  // cause power-up, code is from datasheet
-  // Clear WDRF in MCUSR – MCU Status Register
-  // MCUSR provides information on which reset source caused an MCU Reset.
-  MCUSR = 0x00;
-  // WDTCR - Watchdog Timer Control Register
-  // Write logical one to WDCE and WDE (must be done before disabling)
-  WDTCR |= ( _BV(WDCE) | _BV(WDE) );
-  // Turn off WDT
-  WDTCR = 0x00;
-
-#ifdef USE_CPU_SLEEP
-  // enable power down sleep mode
-  set_sleep_mode(SLEEP_MODE_PWR_DOWN);  // sleep mode
-  sleep_enable();
-#endif
-
-  sei();                                // enable interrupts
-
-}
-
-void loop()
-{
-
-#ifdef USE_CPU_SLEEP
-  // optionally put the CPU to sleep. It will be woken by a USI interrupt
-  // when it sees a "start condition" on the I2C bus. Everything interesting
-  // happens in the usiTwiSlave ISR.
-  sleep_cpu();
-#endif
-
-}
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_analog/attiny85_i2c_analog.ino b/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_analog/attiny85_i2c_analog.ino
deleted file mode 100644
index 7190c93..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_analog/attiny85_i2c_analog.ino
+++ /dev/null
@@ -1,210 +0,0 @@
-/**
- * Example sketch for writing to and reading from a slave in transactional manner
- *
- * NOTE: You must not use delay() or I2C communications will fail, use tws_delay() instead (or preferably some smarter timing system)
- *
- * On write the first byte received is considered the register addres to modify/read
- * On each byte sent or read the register address is incremented (and it will loop back to 0)
- *
- * You can try this with the Arduino I2C REPL sketch at https://github.com/rambo/I2C/blob/master/examples/i2crepl/i2crepl.ino 
- * If you have bus-pirate remember that the older revisions do not like the slave streching the clock, this leads to all sorts of weird behaviour
- * Examples use bus-pirate semantics (like the REPL)
- *
- * The basic idea is:
- *  1. Choose your ADC channel (0-X), use "byte ch = 1;" for example.
- *  2. Combine the channel and conversion start flag to single calue: byte start_on_ch = (ch | _BV(7)); // This is 0x81
- *  3. Write start_on_ch to the first register on the attiny [ 8 0  81 ]
- *  4. Come back later and check the first register [ 8 0 [ r ], if the value is same as ch then the conversion is complete, you can now read the value
- *  5. read the value [ 8 2 [ r r ] (first one is low, second high byte)
- *
- * You need to have at least 8MHz clock on the ATTiny for this to work (and in fact I have so far tested it only on ATTiny85 @8MHz using internal oscillator)
- * Remember to "Burn bootloader" to make sure your chip is in correct mode 
- */
-
-
-/**
- * Pin notes by Suovula, see also http://hlt.media.mit.edu/?p=1229
- *
- * DIP and SOIC have same pinout, however the SOIC chips are much cheaper, especially if you buy more than 5 at a time
- * For nice breakout boards see https://github.com/rambo/attiny_boards
- *
- * Basically the arduino pin numbers map directly to the PORTB bit numbers.
- *
-// I2C
-arduino pin 0 = not(OC1A) = PORTB <- _BV(0) = SOIC pin 5 (I2C SDA, PWM)
-arduino pin 2 =           = PORTB <- _BV(2) = SOIC pin 7 (I2C SCL, Analog 1)
-// Timer1 -> PWM
-arduino pin 1 =     OC1A  = PORTB <- _BV(1) = SOIC pin 6 (PWM)
-arduino pin 3 = not(OC1B) = PORTB <- _BV(3) = SOIC pin 2 (Analog 3)
-arduino pin 4 =     OC1B  = PORTB <- _BV(4) = SOIC pin 3 (Analog 2)
- */
-#define I2C_SLAVE_ADDRESS 0x4 // the 7-bit address (remember to change this when adapting this example)
-// Get this from https://github.com/rambo/TinyWire
-#include <TinyWireS.h>
-// The default buffer size, though we cannot actually affect it by defining it in the sketch
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE ( 16 )
-#endif
-// For the ADC_xxx helpers
-#include <core_adc.h>
-
-// The "registers" we expose to I2C
-volatile uint8_t i2c_regs[] =
-{
-    0x0, // Status register, writing (1<<7 & channel) will start a conversion on that channel, the flag will be set low when conversion is done.
-    0x1, // Averaging count, make this many conversions in row and average the result (well, actually it's a rolling average since we do not want to have the possibility of integer overflows)
-    0x0, // low byte 
-    0x0, // high byte
-};
-const byte reg_size = sizeof(i2c_regs);
-// Tracks the current register pointer position
-volatile byte reg_position;
-// Tracks wheter to start a conversion cycle
-volatile boolean start_conversion;
-// Counter to track where we are averaging
-byte avg_count;
-// Some temp value holders
-int avg_temp1;
-int avg_temp2;
-
-/**
- * This is called for each read request we receive, never put more than one byte of data (with TinyWireS.send) to the 
- * send-buffer when using this callback
- */
-void requestEvent()
-{  
-    TinyWireS.send(i2c_regs[reg_position]);
-    // Increment the reg position on each read, and loop back to zero
-    reg_position++;
-    if (reg_position >= reg_size)
-    {
-        reg_position = 0;
-    }
-}
-
-/**
- * The I2C data received -handler
- *
- * This needs to complete before the next incoming transaction (start, data, restart/stop) on the bus does
- * so be quick, set flags for long running tasks to be called from the mainloop instead of running them directly,
- */
-void receiveEvent(uint8_t howMany)
-{
-    if (howMany < 1)
-    {
-        // Sanity-check
-        return;
-    }
-    if (howMany > TWI_RX_BUFFER_SIZE)
-    {
-        // Also insane number
-        return;
-    }
-
-    reg_position = TinyWireS.receive();
-    howMany--;
-    if (!howMany)
-    {
-        // This write was only to set the buffer for next read
-        return;
-    }
-    while(howMany--)
-    {
-        i2c_regs[reg_position] = TinyWireS.receive();
-        if (   reg_position == 0 // If it was the first register
-            && bitRead(i2c_regs[0], 7) // And the highest bit is set
-            && !ADC_ConversionInProgress() // and we do not actually have a conversion running already
-            )
-        {
-            start_conversion = true;
-        }
-        reg_position++;
-        if (reg_position >= reg_size)
-        {
-            reg_position = 0;
-        }
-    }
-}
-
-
-void setup()
-{
-    // TODO: Tri-state this and wait for input voltage to stabilize 
-    pinMode(3, OUTPUT); // OC1B-, Arduino pin 3, ADC
-    digitalWrite(3, LOW); // Note that this makes the led turn on, it's wire this way to allow for the voltage sensing above.
-
-    pinMode(1, OUTPUT); // OC1A, also The only HW-PWM -pin supported by the tiny core analogWrite
-
-    /**
-     * Reminder: taking care of pull-ups is the masters job
-     */
-
-    TinyWireS.begin(I2C_SLAVE_ADDRESS);
-    TinyWireS.onReceive(receiveEvent);
-    TinyWireS.onRequest(requestEvent);
-
-    
-    // Whatever other setup routines ?
-    
-    digitalWrite(3, HIGH);
-}
-
-void loop()
-{
-    /**
-     * This is the only way we can detect stop condition (http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=984716&sid=82e9dc7299a8243b86cf7969dd41b5b5#984716)
-     * it needs to be called in a very tight loop in order not to miss any (REMINDER: Do *not* use delay() anywhere, use tws_delay() instead).
-     * It will call the function registered via TinyWireS.onReceive(); if there is data in the buffer on stop.
-     */
-    TinyWireS_stop_check();
-
-    // Thus stuff is basically copied from wiring_analog.c
-    if (start_conversion)
-    {
-        //Avoid doubled starts
-        start_conversion = false;
-        byte adcpin = (i2c_regs[0] & 0x7f); // Set the channel from the control reg, dropping the highest bit.
-#if defined( CORE_ANALOG_FIRST )
-        if ( adcpin >= CORE_ANALOG_FIRST ) adcpin -= CORE_ANALOG_FIRST; // allow for channel or pin numbers
-#endif
-        // NOTE: These handy helpers (ADC_xxx) are only present in the tiny-core, for other cores you need to check their wiring_analog.c source.
-        ADC_SetInputChannel( (adc_ic_t)adcpin ); // we need to typecast
-        ADC_StartConversion();
-        // Reset these variables
-        avg_count = 0;
-        avg_temp2 = 0;
-    }
-    
-    if (   bitRead(i2c_regs[0], 7) // We have conversion flag up
-        && !ADC_ConversionInProgress()) // But the conversion is complete
-    {
-        // So handle it
-        avg_temp1 = ADC_GetDataRegister();
-        // Rolling average
-        if (avg_count)
-        {
-            avg_temp2 = (avg_temp2+avg_temp1)/2;
-        }
-        else
-        {
-            avg_temp2 = avg_temp1;
-        }
-        avg_count++;
-        if (avg_count >= i2c_regs[1])
-        {
-            // All done, set the bytes to registers
-            cli();
-            i2c_regs[2] = lowByte(avg_temp2);
-            i2c_regs[3] = highByte(avg_temp2);
-            sei();
-            // And clear the conversion flag so the master knows we're ready
-            bitClear(i2c_regs[0], 7);
-        }
-        else
-        {
-            // Re-trigger conversion
-            ADC_StartConversion();
-        }
-    }
-
-}
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_slave/attiny85_i2c_slave.ino b/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_slave/attiny85_i2c_slave.ino
deleted file mode 100644
index df2532f..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_slave/attiny85_i2c_slave.ino
+++ /dev/null
@@ -1,152 +0,0 @@
-/**
- * Example sketch for writing to and reading from a slave in transactional manner
- *
- * NOTE: You must not use delay() or I2C communications will fail, use tws_delay() instead (or preferably some smarter timing system)
- *
- * On write the first byte received is considered the register addres to modify/read
- * On each byte sent or read the register address is incremented (and it will loop back to 0)
- *
- * You can try this with the Arduino I2C REPL sketch at https://github.com/rambo/I2C/blob/master/examples/i2crepl/i2crepl.ino 
- * If you have bus-pirate remember that the older revisions do not like the slave streching the clock, this leads to all sorts of weird behaviour
- *
- * To read third value (register number 2 since counting starts at 0) send "[ 8 2 [ 9 r ]", value read should be 0xBE
- * If you then send "[ 9 r r r ]" you should get 0xEF 0xDE 0xAD as response (demonstrating the register counter looping back to zero)
- *
- * You need to have at least 8MHz clock on the ATTiny for this to work (and in fact I have so far tested it only on ATTiny85 @8MHz using internal oscillator)
- * Remember to "Burn bootloader" to make sure your chip is in correct mode 
- */
-
-
-/**
- * Pin notes by Suovula, see also http://hlt.media.mit.edu/?p=1229
- *
- * DIP and SOIC have same pinout, however the SOIC chips are much cheaper, especially if you buy more than 5 at a time
- * For nice breakout boards see https://github.com/rambo/attiny_boards
- *
- * Basically the arduino pin numbers map directly to the PORTB bit numbers.
- *
-// I2C
-arduino pin 0 = not(OC1A) = PORTB <- _BV(0) = SOIC pin 5 (I2C SDA, PWM)
-arduino pin 2 =           = PORTB <- _BV(2) = SOIC pin 7 (I2C SCL, Analog 1)
-// Timer1 -> PWM
-arduino pin 1 =     OC1A  = PORTB <- _BV(1) = SOIC pin 6 (PWM)
-arduino pin 3 = not(OC1B) = PORTB <- _BV(3) = SOIC pin 2 (Analog 3)
-arduino pin 4 =     OC1B  = PORTB <- _BV(4) = SOIC pin 3 (Analog 2)
- */
-#define I2C_SLAVE_ADDRESS 0x4 // the 7-bit address (remember to change this when adapting this example)
-// Get this from https://github.com/rambo/TinyWire
-#include <TinyWireS.h>
-// The default buffer size, Can't recall the scope of defines right now
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE ( 16 )
-#endif
-
-
-volatile uint8_t i2c_regs[] =
-{
-    0xDE, 
-    0xAD, 
-    0xBE, 
-    0xEF, 
-};
-// Tracks the current register pointer position
-volatile byte reg_position;
-const byte reg_size = sizeof(i2c_regs);
-
-/**
- * This is called for each read request we receive, never put more than one byte of data (with TinyWireS.send) to the 
- * send-buffer when using this callback
- */
-void requestEvent()
-{  
-    TinyWireS.send(i2c_regs[reg_position]);
-    // Increment the reg position on each read, and loop back to zero
-    reg_position++;
-    if (reg_position >= reg_size)
-    {
-        reg_position = 0;
-    }
-}
-
-// TODO: Either update this to use something smarter for timing or remove it alltogether
-void blinkn(uint8_t blinks)
-{
-    digitalWrite(3, HIGH);
-    while(blinks--)
-    {
-        digitalWrite(3, LOW);
-        tws_delay(50);
-        digitalWrite(3, HIGH);
-        tws_delay(100);
-    }
-}
-
-/**
- * The I2C data received -handler
- *
- * This needs to complete before the next incoming transaction (start, data, restart/stop) on the bus does
- * so be quick, set flags for long running tasks to be called from the mainloop instead of running them directly,
- */
-void receiveEvent(uint8_t howMany)
-{
-    if (howMany < 1)
-    {
-        // Sanity-check
-        return;
-    }
-    if (howMany > TWI_RX_BUFFER_SIZE)
-    {
-        // Also insane number
-        return;
-    }
-
-    reg_position = TinyWireS.receive();
-    howMany--;
-    if (!howMany)
-    {
-        // This write was only to set the buffer for next read
-        return;
-    }
-    while(howMany--)
-    {
-        i2c_regs[reg_position] = TinyWireS.receive();
-        reg_position++;
-        if (reg_position >= reg_size)
-        {
-            reg_position = 0;
-        }
-    }
-}
-
-
-void setup()
-{
-    // TODO: Tri-state this and wait for input voltage to stabilize 
-    pinMode(3, OUTPUT); // OC1B-, Arduino pin 3, ADC
-    digitalWrite(3, LOW); // Note that this makes the led turn on, it's wire this way to allow for the voltage sensing above.
-
-    pinMode(1, OUTPUT); // OC1A, also The only HW-PWM -pin supported by the tiny core analogWrite
-
-    /**
-     * Reminder: taking care of pull-ups is the masters job
-     */
-
-    TinyWireS.begin(I2C_SLAVE_ADDRESS);
-    TinyWireS.onReceive(receiveEvent);
-    TinyWireS.onRequest(requestEvent);
-
-    
-    // Whatever other setup routines ?
-    
-    digitalWrite(3, HIGH);
-}
-
-void loop()
-{
-    /**
-     * This is the only way we can detect stop condition (http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=984716&sid=82e9dc7299a8243b86cf7969dd41b5b5#984716)
-     * it needs to be called in a very tight loop in order not to miss any (REMINDER: Do *not* use delay() anywhere, use tws_delay() instead).
-     * It will call the function registered via TinyWireS.onReceive(); if there is data in the buffer on stop.
-     */
-    TinyWireS_stop_check();
-}
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_slave_task/attiny85_i2c_slave_task.ino b/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_slave_task/attiny85_i2c_slave_task.ino
deleted file mode 100644
index 4b3f269..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/examples/attiny85_i2c_slave_task/attiny85_i2c_slave_task.ino
+++ /dev/null
@@ -1,246 +0,0 @@
-/**
- * Example sketch for writing to and reading from a slave in transactional manner, it will also blink a led attached to pin 3 (which is the SOIC pin 2)
- * (provided you're using one of my ATTiny85 boards from https://github.com/rambo/attiny_boards with the led soldered) 
- *
- * NOTE: You must not use delay() or I2C communications will fail, use tws_delay() instead (or preferably some smarter timing system, like the Task library used in this example)
- *
- * On write the first byte received is considered the register addres to modify/read
- * On each byte sent or read the register address is incremented (and it will loop back to 0)
- *
- * You can try this with the Arduino I2C REPL sketch at https://github.com/rambo/I2C/blob/master/examples/i2crepl/i2crepl.ino 
- * If you have bus-pirate remember that the older revisions do not like the slave streching the clock, this leads to all sorts of weird behaviour
- *
- * By default this blinks the SOS morse pattern and then has long on/off time to indicate end of pattern, send [ 8 0 32 ] (using the REPL/bus-pirate 
- * semantics) to make the delay per bit smaller (and thus blinking faster). The pattern lenght is calculated from the register size, it would be fairly
- * trivial to make it yet another variable changeable via I2C.
- *
- * You need to have at least 8MHz clock on the ATTiny for this to work (and in fact I have so far tested it only on ATTiny85 @8MHz using internal oscillator)
- * Remember to "Burn bootloader" to make sure your chip is in correct mode 
- */
-
-
-/**
- * Pin notes by Suovula, see also http://hlt.media.mit.edu/?p=1229
- *
- * DIP and SOIC have same pinout, however the SOIC chips are much cheaper, especially if you buy more than 5 at a time
- * For nice breakout boards see https://github.com/rambo/attiny_boards
- *
- * Basically the arduino pin numbers map directly to the PORTB bit numbers.
- *
-// I2C
-arduino pin 0 = not(OC1A) = PORTB <- _BV(0) = SOIC pin 5 (I2C SDA, PWM)
-arduino pin 2 =           = PORTB <- _BV(2) = SOIC pin 7 (I2C SCL, Analog 1)
-// Timer1 -> PWM
-arduino pin 1 =     OC1A  = PORTB <- _BV(1) = SOIC pin 6 (PWM)
-arduino pin 3 = not(OC1B) = PORTB <- _BV(3) = SOIC pin 2 (Analog 3)
-arduino pin 4 =     OC1B  = PORTB <- _BV(4) = SOIC pin 3 (Analog 2)
- */
-#define I2C_SLAVE_ADDRESS 0x4 // the 7-bit address (remember to change this when adapting this example)
-// Get this from https://github.com/rambo/TinyWire
-#include <TinyWireS.h>
-// The default buffer size, Can't recall the scope of defines right now
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE ( 16 )
-#endif
-// Get this library from http://bleaklow.com/files/2010/Task.tar.gz 
-// and read http://bleaklow.com/2010/07/20/a_very_simple_arduino_task_manager.html for background and instructions
-#include <Task.h>
-#include <TaskScheduler.h>
-
-// The led is connected so that the tiny sinks current
-#define LED_ON LOW
-#define LED_OFF HIGH
-
-// The I2C registers
-volatile uint8_t i2c_regs[] =
-{
-    150, // Delay between each position (ms, remeber that this isa byte so 255 is max)
-    B10101000, // SOS pattern 
-    B01110111, 
-    B01110001,
-    B01010000, 
-    B00000000,
-    B11111111, // Long on and off to mark end of pattern
-    B00000000,
-};
-// Tracks the current register pointer position
-volatile byte reg_position;
-const byte reg_size = sizeof(i2c_regs);
-
-
-/**
- * BEGIN: PatternBlinker task based on the Task library Blinker example
- */
-// Timed task to blink a LED.
-const byte pattern_lenght = (sizeof(i2c_regs)-1) * 8; // bits (first is the speed, rest is the pattern)
-class PatternBlinker : public TimedTask
-{
-public:
-    // Create a new blinker for the specified pin and rate.
-    PatternBlinker(uint8_t _pin);
-    virtual void run(uint32_t now);
-private:
-    uint8_t pin;      // LED pin.
-    uint8_t pattern_position; // Used to calcuate the register and bit offset
-};
-
-PatternBlinker::PatternBlinker(uint8_t _pin)
-: TimedTask(millis()),
-  pin(_pin)
-{
-    pinMode(pin, OUTPUT);     // Set pin for output.
-}
-
-void PatternBlinker::run(uint32_t now)
-{
-    // Start by setting the next runtime
-    incRunTime(i2c_regs[0]);
-
-    // Written out for clear code, the complier might optimize it to something more efficient even without it being unrolled into one line
-    byte reg = i2c_regs[1+(pattern_position/8)]; // Get the register where the bit pattern position is stored
-    byte shift_amount = 7 - (pattern_position % 7); // To have "natural" left-to-right pattern flow.
-    bool state = (reg >> shift_amount) & 0x1;
-    if (state) {
-        digitalWrite(pin, LED_ON);
-    } else {
-        digitalWrite(pin, LED_OFF);
-    }
-    // Calculate the next pattern position
-    pattern_position = (pattern_position+1) % pattern_lenght;
-}
-/**
- * END: PatternBlinker task copied from the Task library example
- */
-/**
- * BEGIN: I2C Stop flag checker
- *
- * This task needs to run almost all the time due to the USI I2C implementation limitations
- *
- * So I2CStopCheck_YIELD_TICKS below is used to specify how often the task is run, not it's every 4 ticks
- */
-#define I2CStopCheck_YIELD_TICKS 4
-class I2CStopCheck : public Task
-{
-public:
-    I2CStopCheck();
-    virtual void run(uint32_t now);
-    virtual bool canRun(uint32_t now);
-private:
-    uint8_t yield_counter; // Incremented on each canRun call, used to yield to other tasks.
-};
-
-I2CStopCheck::I2CStopCheck()
-: Task()
-{
-}
-
-// We can't just return true since then no other task could ever run (since we have the priority)
-bool I2CStopCheck::canRun(uint32_t now)
-{
-    yield_counter++;
-    bool ret = false;
-    if (yield_counter == I2CStopCheck_YIELD_TICKS)
-    {
-        ret = true;
-        yield_counter = 0;
-    }
-    return ret;
-}
-
-void I2CStopCheck::run(uint32_t now)
-{
-    TinyWireS_stop_check();
-}
-/**
- * END: I2C Stop flag checker
- */
-
-// Create the tasks.
-PatternBlinker blinker(3);
-I2CStopCheck checker;
-
-// Tasks are in priority order, only one task is run per tick
-Task *tasks[] = { &checker, &blinker, };
-TaskScheduler sched(tasks, NUM_TASKS(tasks));
-
-
-/**
- * This is called for each read request we receive, never put more than one byte of data (with TinyWireS.send) to the 
- * send-buffer when using this callback
- */
-void requestEvent()
-{  
-    TinyWireS.send(i2c_regs[reg_position]);
-    // Increment the reg position on each read, and loop back to zero
-    reg_position++;
-    if (reg_position >= reg_size)
-    {
-        reg_position = 0;
-    }
-}
-
-/**
- * The I2C data received -handler
- *
- * This needs to complete before the next incoming transaction (start, data, restart/stop) on the bus does
- * so be quick, set flags for long running tasks to be called from the mainloop instead of running them directly,
- */
-void receiveEvent(uint8_t howMany)
-{
-    if (howMany < 1)
-    {
-        // Sanity-check
-        return;
-    }
-    if (howMany > TWI_RX_BUFFER_SIZE)
-    {
-        // Also insane number
-        return;
-    }
-
-    reg_position = TinyWireS.receive();
-    howMany--;
-    if (!howMany)
-    {
-        // This write was only to set the buffer for next read
-        return;
-    }
-    while(howMany--)
-    {
-        i2c_regs[reg_position] = TinyWireS.receive();
-        reg_position++;
-        if (reg_position >= reg_size)
-        {
-            reg_position = 0;
-        }
-    }
-}
-
-
-void setup()
-{
-    // TODO: Tri-state this and wait for input voltage to stabilize 
-    pinMode(3, OUTPUT); // OC1B-, Arduino pin 3, ADC
-    digitalWrite(3, LED_ON); // Note that this makes the led turn on, it's wire this way to allow for the voltage sensing above.
-
-    pinMode(1, OUTPUT); // OC1A, also The only HW-PWM -pin supported by the tiny core analogWrite
-
-    /**
-     * Reminder: taking care of pull-ups is the masters job
-     */
-
-    TinyWireS.begin(I2C_SLAVE_ADDRESS);
-    TinyWireS.onReceive(receiveEvent);
-    TinyWireS.onRequest(requestEvent);
-
-    
-    // Whatever other setup routines ?
-    
-    digitalWrite(3, LED_OFF);
-}
-
-void loop()
-{
-    // Run the scheduler - never returns.
-    sched.run();
-}
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/keywords.txt b/digital-driver/firmware/TinyWire-master/TinyWireS/keywords.txt
deleted file mode 100644
index ccc0b46..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/keywords.txt
+++ /dev/null
@@ -1,27 +0,0 @@
-#######################################
-# Syntax Coloring Map For TinyWireS
-#######################################
-
-#######################################
-# Datatypes (KEYWORD1)
-#######################################
-
-#######################################
-# Methods and Functions (KEYWORD2)
-#######################################
-
-begin	KEYWORD2
-send	KEYWORD2
-available	KEYWORD2
-receive	KEYWORD2
-
-#######################################
-# Instances (KEYWORD2)
-#######################################
-
-TinyWireS	KEYWORD2
-
-#######################################
-# Constants (LITERAL1)
-#######################################
-
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/usiTwiSlave.c b/digital-driver/firmware/TinyWire-master/TinyWireS/usiTwiSlave.c
deleted file mode 100644
index a263184..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/usiTwiSlave.c
+++ /dev/null
@@ -1,748 +0,0 @@
-/********************************************************************************
-
-USI TWI Slave driver.
-
-Created by Donald R. Blake. donblake at worldnet.att.net
-Adapted by Jochen Toppe, jochen.toppe at jtoee.com
-
----------------------------------------------------------------------------------
-
-Created from Atmel source files for Application Note AVR312: Using the USI Module
-as an I2C slave.
-
-This program is free software; you can redistribute it and/or modify it under the
-terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2 of the License, or (at your option) any later
-version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
----------------------------------------------------------------------------------
-
-Change Activity:
-
-    Date       Description
-   ------      -------------
-  16 Mar 2007  Created.
-  27 Mar 2007  Added support for ATtiny261, 461 and 861.
-  26 Apr 2007  Fixed ACK of slave address on a read.
-  04 Jul 2007  Fixed USISIF in ATtiny45 def
-  12 Dev 2009  Added callback functions for data requests
-  06 Feb 2016  Minor change to allow mutli-byte requestFrom() from master.
-  10 Feb 2016  Simplied RX/TX buffer code and allowed use of full buffer.
-  13 Feb 2016  Made USI_RECEIVE_CALLBACK() callback fully interrupt-driven
-  12 Dec 2016  Added support for ATtiny167
-  23 Dec 2017  Fixed repeated restart (which broke when making receive callback
-                interrupt-driven)
-
-********************************************************************************/
-
-
-/********************************************************************************
-                                    includes
-********************************************************************************/
-
-#include <avr/io.h>
-#include <avr/interrupt.h>
-
-#include "usiTwiSlave.h"
-//#include "../common/util.h"
-
-
-/********************************************************************************
-                            device dependent defines
-********************************************************************************/
-
-#if defined( __AVR_ATtiny167__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-#if defined( __AVR_ATtiny2313__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB5
-#  define PORT_USI_SCL        PB7
-#  define PIN_USI_SDA         PINB5
-#  define PIN_USI_SCL         PINB7
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-#if defined(__AVR_ATtiny84__) | \
-     defined(__AVR_ATtiny44__)
-#  define DDR_USI             DDRA
-#  define PORT_USI            PORTA
-#  define PIN_USI             PINA
-#  define PORT_USI_SDA        PORTA6
-#  define PORT_USI_SCL        PORTA4
-#  define PIN_USI_SDA         PINA6
-#  define PIN_USI_SCL         PINA4
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATtiny25__ ) | \
-     defined( __AVR_ATtiny45__ ) | \
-     defined( __AVR_ATtiny85__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATtiny26__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_STRT_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATtiny261__ ) | \
-      defined( __AVR_ATtiny461__ ) | \
-      defined( __AVR_ATtiny861__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATmega165__ ) | \
-     defined( __AVR_ATmega325__ ) | \
-     defined( __AVR_ATmega3250__ ) | \
-     defined( __AVR_ATmega645__ ) | \
-     defined( __AVR_ATmega6450__ ) | \
-     defined( __AVR_ATmega329__ ) | \
-     defined( __AVR_ATmega3290__ )
-#  define DDR_USI             DDRE
-#  define PORT_USI            PORTE
-#  define PIN_USI             PINE
-#  define PORT_USI_SDA        PE5
-#  define PORT_USI_SCL        PE4
-#  define PIN_USI_SDA         PINE5
-#  define PIN_USI_SCL         PINE4
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-#if defined( __AVR_ATmega169__ )
-#  define DDR_USI             DDRE
-#  define PORT_USI            PORTE
-#  define PIN_USI             PINE
-#  define PORT_USI_SDA        PE5
-#  define PORT_USI_SCL        PE4
-#  define PIN_USI_SDA         PINE5
-#  define PIN_USI_SCL         PINE4
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-// These macros make the stop condition detection code more readable.
-#define USI_PINS_SCL_SDA ( ( 1 << PIN_USI_SDA ) | ( 1 << PIN_USI_SCL ) )
-#define USI_PINS_SDA     ( 1 << PIN_USI_SDA )
-#define USI_PINS_SCL     ( 1 << PIN_USI_SCL )
-
-/********************************************************************************
-
-                        functions implemented as macros
-
-********************************************************************************/
-
-#define SET_USI_TO_SEND_ACK( ) \
-{ \
-  /* prepare ACK, ack is a zero */ \
-  USIDR = 0; \
-  /* set SDA as output */ \
-  DDR_USI |= ( 1 << PORT_USI_SDA ); \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR = \
-       ( 0 << USI_START_COND_INT ) | \
-       ( 1 << USIOIF ) | ( 1 << USIPF ) | \
-       ( 1 << USIDC )| \
-       /* set USI counter to shift 1 bit */ \
-       ( 0x0E << USICNT0 ); \
-}
-
-#define SET_USI_TO_READ_ACK( ) \
-{ \
-  /* set SDA as input */ \
-  DDR_USI &= ~( 1 << PORT_USI_SDA ); \
-  /* prepare ACK */ \
-  USIDR = 0; \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR = \
-       ( 0 << USI_START_COND_INT ) | \
-       ( 1 << USIOIF ) | \
-       ( 1 << USIPF ) | \
-       ( 1 << USIDC ) | \
-       /* set USI counter to shift 1 bit */ \
-       ( 0x0E << USICNT0 ); \
-}
-
-#define SET_USI_TO_TWI_START_CONDITION_MODE( ) \
-{ \
-  USICR = \
-       /* enable Start Condition Interrupt, disable Overflow Interrupt */ \
-       ( 1 << USISIE ) | ( 0 << USIOIE ) | \
-       /* set USI in Two-wire mode, no USI Counter overflow hold */ \
-       ( 1 << USIWM1 ) | ( 0 << USIWM0 ) | \
-       /* Shift Register Clock Source = External, positive edge */ \
-       /* 4-Bit Counter Source = external, both edges */ \
-       ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) | \
-       /* no toggle clock-port pin */ \
-       ( 0 << USITC ); \
-  USISR = \
-        /* clear all interrupt flags, except Start Cond */ \
-        ( 0 << USI_START_COND_INT ) | ( 1 << USIOIF ) | ( 1 << USIPF ) | \
-        ( 1 << USIDC ) | ( 0x0 << USICNT0 ); \
-}
-
-#define SET_USI_TO_SEND_DATA( ) \
-{ \
-  /* set SDA as output */ \
-  DDR_USI |=  ( 1 << PORT_USI_SDA ); \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR    =  \
-       ( 0 << USI_START_COND_INT ) | ( 1 << USIOIF ) | ( 1 << USIPF ) | \
-       ( 1 << USIDC) | \
-       /* set USI to shift out 8 bits */ \
-       ( 0x0 << USICNT0 ); \
-}
-
-#define SET_USI_TO_READ_DATA( ) \
-{ \
-  /* set SDA as input */ \
-  DDR_USI &= ~( 1 << PORT_USI_SDA ); \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR    = \
-       ( 0 << USI_START_COND_INT ) | ( 1 << USIOIF ) | \
-       ( 1 << USIPF ) | ( 1 << USIDC ) | \
-       /* set USI to shift out 8 bits */ \
-       ( 0x0 << USICNT0 ); \
-}
-
-#define USI_RECEIVE_CALLBACK() \
-{ \
-    if (usi_onReceiverPtr) \
-    { \
-        if (usiTwiAmountDataInReceiveBuffer()) \
-        { \
-            usi_onReceiverPtr(usiTwiAmountDataInReceiveBuffer()); \
-        } \
-    } \
-}
-
-#define USI_REQUEST_CALLBACK() \
-{ \
-    if(usi_onRequestPtr) usi_onRequestPtr(); \
-}
-
-/********************************************************************************
-
-                                   typedef's
-
-********************************************************************************/
-
-typedef enum
-{
-  USI_SLAVE_CHECK_ADDRESS                = 0x00,
-  USI_SLAVE_SEND_DATA                    = 0x01,
-  USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA = 0x02,
-  USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA   = 0x03,
-  USI_SLAVE_REQUEST_DATA                 = 0x04,
-  USI_SLAVE_GET_DATA_AND_SEND_ACK        = 0x05
-} overflowState_t;
-
-
-
-/********************************************************************************
-
-                                local variables
-
-********************************************************************************/
-
-static uint8_t                  slaveAddress;
-static uint8_t                  sleep_enable_bit;
-static uint8_t                  in_transaction;
-static volatile overflowState_t overflowState;
-
-
-static uint8_t          rxBuf[ TWI_RX_BUFFER_SIZE ];
-static volatile uint8_t rxHead;
-static volatile uint8_t rxTail;
-static volatile uint8_t rxCount;
-
-static uint8_t          txBuf[ TWI_TX_BUFFER_SIZE ];
-static volatile uint8_t txHead;
-static volatile uint8_t txTail;
-static volatile uint8_t txCount;
-
-
-
-/********************************************************************************
-
-                                local functions
-
-********************************************************************************/
-
-// flushes the TWI buffers
-
-static void flushTwiBuffers( void )
-{
-  rxTail = 0;
-  rxHead = 0;
-  rxCount = 0;
-  txTail = 0;
-  txHead = 0;
-  txCount = 0;
-} // end flushTwiBuffers
-
-
-
-/********************************************************************************
-
-                                public functions
-
-********************************************************************************/
-
-// initialise USI for TWI slave mode
-
-void usiTwiSlaveInit( uint8_t ownAddress )
-{
-  // initialize the TX and RX buffers to empty
-  flushTwiBuffers( );
-
-  slaveAddress = ownAddress;
-
-  // In Two Wire mode (USIWM1, USIWM0 = 1X), the slave USI will pull SCL
-  // low when a start condition is detected or a counter overflow (only
-  // for USIWM1, USIWM0 = 11).  This inserts a wait state.  SCL is released
-  // by the ISRs (USI_START_vect and USI_OVERFLOW_vect).
-
-  // Set SCL and SDA as output
-  DDR_USI |= ( 1 << PORT_USI_SCL ) | ( 1 << PORT_USI_SDA );
-
-  // set SCL high
-  PORT_USI |= ( 1 << PORT_USI_SCL );
-
-  // set SDA high
-  PORT_USI |= ( 1 << PORT_USI_SDA );
-
-  // Set SDA as input
-  DDR_USI &= ~( 1 << PORT_USI_SDA );
-
-  USICR =
-       // enable Start Condition Interrupt
-       ( 1 << USISIE ) |
-       // disable Overflow Interrupt
-       ( 0 << USIOIE ) |
-       // set USI in Two-wire mode, no USI Counter overflow hold
-       ( 1 << USIWM1 ) | ( 0 << USIWM0 ) |
-       // Shift Register Clock Source = external, positive edge
-       // 4-Bit Counter Source = external, both edges
-       ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) |
-       // no toggle clock-port pin
-       ( 0 << USITC );
-
-  // clear all interrupt flags and reset overflow counter
-
-  USISR = ( 1 << USI_START_COND_INT ) | ( 1 << USIOIF ) | ( 1 << USIPF ) | ( 1 << USIDC );
-
-  // The 'in_transaction' variable remembers if the usiTwiSlave driver is in the middle of
-  // an i2c transaction. Initialize it to zero
-  in_transaction = 0;
-
-} // end usiTwiSlaveInit
-
-
-bool usiTwiDataInTransmitBuffer(void)
-{
-
-  // return 0 (false) if the receive buffer is empty
-  return txCount;
-
-} // end usiTwiDataInTransmitBuffer
-
-
-// put data in the transmission buffer, wait if buffer is full
-
-void usiTwiTransmitByte( uint8_t data )
-{
-
-  // wait for free space in buffer
-  while ( txCount == TWI_TX_BUFFER_SIZE) ;
-
-  // store data in buffer
-  txBuf[ txHead ] = data;
-  txHead = ( txHead + 1 ) & TWI_TX_BUFFER_MASK;
-  txCount++;
-
-} // end usiTwiTransmitByte
-
-
-// return a byte from the receive buffer, wait if buffer is empty
-
-uint8_t usiTwiReceiveByte( void )
-{
-  uint8_t rtn_byte;
-
-  // wait for Rx data
-  while ( !rxCount );
-
-  rtn_byte = rxBuf [ rxTail ];
-  // calculate buffer index
-  rxTail = ( rxTail + 1 ) & TWI_RX_BUFFER_MASK;
-  rxCount--;
-
-  // return data from the buffer.
-  return rtn_byte;
-
-} // end usiTwiReceiveByte
-
-
-uint8_t usiTwiAmountDataInReceiveBuffer(void)
-{
-    return rxCount;
-}
-
-
-/********************************************************************************
-
-                            USI Start Condition ISR
-
-********************************************************************************/
-
-ISR( USI_START_VECTOR )
-{
-  uint8_t usi_pins;
-  // http://www.atmel.com/webdoc/AVRLibcReferenceManual/group__avr__interrupts.html
-
-  // Notes about ISR. The compiler in the Arduino IDE handles some of the
-  // basic ISR plumbing (unless the "ISR_NAKED" attribute is applied).
-  //   * The AVR processor resets the SREG.I bit when jumping into an ISR
-  //   * The compiler automatically adds code to save SREG
-  //   * < user's ISR code goes here >
-  //   * The compiler automatically adds code to restore SREG
-  //   * The compiler automatically uses the RETI instruction to return from the ISR.
-  //     The RETI instruction enables interrupts after the return from ISR.
-  // The compiler behavior can be altered with attributes into the ISR declaration;
-  // however, the description above is the default.
-
-  // cli() call is not necessary. Processor disables interrupts when
-  // jumping to an ISR
-
-  // no need to save the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  if ( !in_transaction )
-  {
-    // remeber the sleep enable bit when entering the ISR
-    sleep_enable_bit = MCUCR & ( 1 << SE );
-
-    // clear the sleep enable bit to prevent the CPU from entering sleep mode while executing this ISR.
-    MCUCR &= ~( 1 << SE );
-  }
-
-  // set default starting conditions for new TWI package
-  overflowState = USI_SLAVE_CHECK_ADDRESS;
-
-  // set SDA as input
-  DDR_USI &= ~( 1 << PORT_USI_SDA );
-
-  // the start condition is that the master pulls SDA low.
-
-  // wait for SCL to go low to ensure the Start Condition has completed (the
-  // start detector will hold SCL low ) - if a Stop Condition arises then leave
-  // the interrupt to prevent waiting forever - don't use USISR to test for Stop
-  // Condition as in Application Note AVR312 because the Stop Condition Flag is
-  // going to be set from the last TWI sequence
-
-  // while SCL is high and SDA is low
-  while  ( ( usi_pins = PIN_USI & USI_PINS_SCL_SDA ) == USI_PINS_SCL );
-
-  // if SDA line was low at SCL edge, then start condition occurred
-  if ( !( usi_pins & USI_PINS_SDA ) )
-  {
-    // a Stop Condition did not occur
-    
-    // Execute callback if this is a repeated start
-    if (in_transaction)
-    {
-        USI_RECEIVE_CALLBACK();
-    }
-
-    USICR =
-         // keep Start Condition Interrupt enabled to detect RESTART
-         ( 1 << USISIE ) |
-         // enable Overflow Interrupt
-         ( 1 << USIOIE ) |
-         // set USI in Two-wire mode, hold SCL low on USI Counter overflow
-         ( 1 << USIWM1 ) | ( 1 << USIWM0 ) |
-         // Shift Register Clock Source = External, positive edge
-         // 4-Bit Counter Source = external, both edges
-         ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) |
-         // no toggle clock-port pin
-         ( 0 << USITC );
-         
-    //remember that the USI is in a valid i2c transaction
-    in_transaction = 1;
-
-  }
-  else
-  {
-    // a Stop Condition did occur
-
-    USICR =
-         // enable Start Condition Interrupt
-         ( 1 << USISIE ) |
-         // disable Overflow Interrupt
-         ( 0 << USIOIE ) |
-         // set USI in Two-wire mode, no USI Counter overflow hold
-         ( 1 << USIWM1 ) | ( 0 << USIWM0 ) |
-         // Shift Register Clock Source = external, positive edge
-         // 4-Bit Counter Source = external, both edges
-         ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) |
-         // no toggle clock-port pin
-         ( 0 << USITC );
-
-    //no longer in valid i2c transaction
-    in_transaction = 0;
-    // restore the sleep enable bit
-    MCUCR |= sleep_enable_bit;
-
-  } // end if
-
-  USISR =
-       // clear interrupt flags - resetting the Start Condition Flag will
-       // release SCL
-       ( 1 << USI_START_COND_INT ) | ( 1 << USIOIF ) |
-       ( 1 << USIPF ) |( 1 << USIDC ) |
-       // set USI to sample 8 bits (count 16 external SCL pin toggles)
-       ( 0x0 << USICNT0);
-
-  // no need to restore the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  // The compiler automatically uses an RETI instruction to return when using the
-  // ISR construct without modifying attributes.
-
-} // end ISR( USI_START_VECTOR )
-
-
-
-/********************************************************************************
-
-                                USI Overflow ISR
-
-Handles all the communication.
-
-Only disabled when waiting for a new Start Condition.
-
-********************************************************************************/
-
-ISR( USI_OVERFLOW_VECTOR )
-{
-  uint8_t finished;
-  uint8_t usi_pins;
-
-  // http://www.atmel.com/webdoc/AVRLibcReferenceManual/group__avr__interrupts.html
-
-  // Notes about ISR. The compiler in the Arduino IDE handles some of the
-  // basic ISR plumbing.
-  //   * The AVR processor resets the SREG.I bit when jumping into an ISR
-  //   * The compiler automatically adds code to save the SREG
-  //   * < user's ISR code goes here >
-  //   * The compiler automatically adds code to restore the SREG
-  //   * The compiler automatically uses the RETI instruction to return from the ISR.
-  //     The RETI insturction enables interrupts after the return from ISR.
-  // The compiler behavior can be altered with attributes into the ISR declaration;
-  // however, the description above is the default.
-
-  // cli() call is not necessary. Processor disables interrupts when
-  // jumping to an ISR
-
-  // no need to save the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  // The ISR is only ever entered because the ISR(USI_START_VECTOR) interrupt
-  // routine ran first. That routine saved the sleep mode and disabled sleep.
-
-  // Most of the time this routine exits, it has setup the USI to shift in/out bits
-  // and is expected to re-entered because of the USI overflow interrupt. Track whether or
-  // not the transaction is completely finished.
-  finished = 0;
-
-
-  switch ( overflowState )
-  {
-
-    // Address mode: check address and send ACK (and next USI_SLAVE_SEND_DATA) if OK,
-    // else reset USI
-    case USI_SLAVE_CHECK_ADDRESS:
-      if ( ( USIDR == 0 ) || ( ( USIDR >> 1 ) == slaveAddress) )
-      {
-        if ( USIDR & 0x01 )
-        {
-          overflowState = USI_SLAVE_SEND_DATA;
-        }
-        else
-        {
-          overflowState = USI_SLAVE_REQUEST_DATA;
-        } // end if
-
-        // ack the start frame
-        // sets up the USI to pull SDA low and clock one bit (two edges)
-        SET_USI_TO_SEND_ACK( );
-      }
-      else
-      {
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-        finished = 1;
-      }
-      break;
-
-    // master-read / slave-send: check reply and goto USI_SLAVE_SEND_DATA if OK,
-    // else reset USI
-    case USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA:
-      // Execute request callback for each byte requested, as this is the intended
-      // behavior of this library
-      USI_REQUEST_CALLBACK();
-      if ( USIDR )
-      {
-        // if NACK, the master does not want more data
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-        finished = 1;
-        break;
-      }
-      // from here we just drop straight into USI_SLAVE_SEND_DATA if the
-      // master sent an ACK
-
-    // copy data from buffer to USIDR and set USI to shift byte
-    // next USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA
-    case USI_SLAVE_SEND_DATA:
-      // Get data from Buffer
-      if ( txCount )
-      {
-        USIDR = txBuf[ txTail ];
-        txTail = ( txTail + 1 ) & TWI_TX_BUFFER_MASK;
-        txCount--;
-
-        overflowState = USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA;
-        SET_USI_TO_SEND_DATA( );
-      }
-      else
-      {
-        // the buffer is empty
-        SET_USI_TO_READ_ACK( ); // This might be neccessary sometimes see http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=805227#805227
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-      } // end if
-      break;
-
-    // set USI to sample reply from master
-    // next USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA
-    case USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA:
-      overflowState = USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA;
-      SET_USI_TO_READ_ACK( );
-      break;
-
-    // master-send / slave-receive: set USI to sample data from master, next
-    // USI_SLAVE_GET_DATA_AND_SEND_ACK
-    case USI_SLAVE_REQUEST_DATA:
-      overflowState = USI_SLAVE_GET_DATA_AND_SEND_ACK;
-      SET_USI_TO_READ_DATA( );
-
-      // with the SET_USI_TO_READ_DATA() macro call above, the USI has
-      // been setup to catch the next byte if the master sends one.
-      // while that's going on, look for a stop condition here which
-      // is when the SDA line goes high after the SCL line;
-
-      // wait until SCL goes high
-      while  ( ! ( ( usi_pins = PIN_USI & USI_PINS_SCL_SDA ) & USI_PINS_SCL ) );
-
-      // if SDA line was high at SCL edge, then not a stop condition
-      if ( usi_pins & USI_PINS_SDA )
-        break;
-
-      // wait until SCL goes low or SDA goes high
-      while  ( ( usi_pins = PIN_USI & USI_PINS_SCL_SDA ) == USI_PINS_SCL );
-
-      // if both SCL and SDA are high, then stop condition occurred
-      if ( usi_pins == USI_PINS_SCL_SDA )
-      {
-        USI_RECEIVE_CALLBACK();
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-        finished = 1;
-      }
-
-      break;
-
-    // copy data from USIDR and send ACK
-    // next USI_SLAVE_REQUEST_DATA
-    case USI_SLAVE_GET_DATA_AND_SEND_ACK:
-      // put data into buffer
-      // check buffer size
-      if ( rxCount < TWI_RX_BUFFER_SIZE )
-      {
-        rxBuf[ rxHead ] = USIDR;
-        rxHead = ( rxHead + 1 ) & TWI_RX_BUFFER_MASK;
-        rxCount++;
-      } else {
-        // overrun
-        // drop data
-      }
-      // next USI_SLAVE_REQUEST_DATA
-      overflowState = USI_SLAVE_REQUEST_DATA;
-      SET_USI_TO_SEND_ACK( );
-      break;
-
-  } // end switch
-
-  if (finished)
-  {
-    //no longer in valid i2c transaction
-    in_transaction = 0;
-    // restore the sleep enable bit
-    // note that this allows sleep -- it does not cause sleep
-    MCUCR |= sleep_enable_bit;
-  }
-
-  // no need to restore the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  // The compiler automatically uses an RETI instruction to return when using the
-  // ISR construct without modifying attributes.
-
-} // end ISR( USI_OVERFLOW_VECTOR )
diff --git a/digital-driver/firmware/TinyWire-master/TinyWireS/usiTwiSlave.h b/digital-driver/firmware/TinyWire-master/TinyWireS/usiTwiSlave.h
deleted file mode 100644
index 88b9445..0000000
--- a/digital-driver/firmware/TinyWire-master/TinyWireS/usiTwiSlave.h
+++ /dev/null
@@ -1,96 +0,0 @@
-/********************************************************************************
-
-Header file for the USI TWI Slave driver.
-
-Created by Donald R. Blake
-donblake at worldnet.att.net
-
----------------------------------------------------------------------------------
-
-Created from Atmel source files for Application Note AVR312: Using the USI Module
-as an I2C slave.
-
-This program is free software; you can redistribute it and/or modify it under the
-terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2 of the License, or (at your option) any later
-version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
----------------------------------------------------------------------------------
-
-Change Activity:
-
-    Date       Description
-   ------      -------------
-  15 Mar 2007  Created.
-
-********************************************************************************/
-
-
-
-#ifndef _USI_TWI_SLAVE_H_
-#define _USI_TWI_SLAVE_H_
-
-
-
-/********************************************************************************
-
-                                    includes
-
-********************************************************************************/
-
-#include <stdbool.h>
-#include <avr/sleep.h>
-
-
-
-/********************************************************************************
-
-                                   prototypes
-
-********************************************************************************/
-
-void    usiTwiSlaveInit( uint8_t );
-void    usiTwiTransmitByte( uint8_t );
-uint8_t usiTwiReceiveByte( void );
-bool    usiTwiDataInTransmitBuffer(void);
-uint8_t usiTwiAmountDataInReceiveBuffer(void);
-// on_XXX handler pointers
-void    (*usi_onRequestPtr)(void);
-void    (*usi_onReceiverPtr)(uint8_t);
-
-
-/********************************************************************************
-
-                           driver buffer definitions
-
-********************************************************************************/
-
-// permitted RX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256
-
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE  ( 16 )
-#endif
-#define TWI_RX_BUFFER_MASK  ( TWI_RX_BUFFER_SIZE - 1 )
-
-#if ( TWI_RX_BUFFER_SIZE & TWI_RX_BUFFER_MASK )
-#  error TWI RX buffer size is not a power of 2
-#endif
-
-// permitted TX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256
-
-#ifndef TWI_TX_BUFFER_SIZE
-#define TWI_TX_BUFFER_SIZE ( 16 )
-#endif
-#define TWI_TX_BUFFER_MASK ( TWI_TX_BUFFER_SIZE - 1 )
-
-#if ( TWI_TX_BUFFER_SIZE & TWI_TX_BUFFER_MASK )
-#  error TWI TX buffer size is not a power of 2
-#endif
-
-
-
-#endif  // ifndef _USI_TWI_SLAVE_H_
diff --git a/digital-driver/firmware/TinyWireS.zip b/digital-driver/firmware/TinyWireS.zip
deleted file mode 100644
index aa3958c..0000000
--- a/digital-driver/firmware/TinyWireS.zip
+++ /dev/null
diff --git a/digital-driver/firmware/TinyWireS/TinyWireS.cpp b/digital-driver/firmware/TinyWireS/TinyWireS.cpp
deleted file mode 100644
index 783e8e7..0000000
--- a/digital-driver/firmware/TinyWireS/TinyWireS.cpp
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
-  TinyWireS.cpp - a wrapper class for Don Blake's usiTwiSlave routines.
-  Provides TWI/I2C Slave functionality on ATtiny processers in Arduino environment.
-  1/23/2011 BroHogan -  brohoganx10 at gmail dot com
-
-  **** See TinyWireS.h for Credits and Usage information ****
-
-  This library is free software; you can redistribute it and/or modify it under the
-  terms of the GNU General Public License as published by the Free Software
-  Foundation; either version 2.1 of the License, or any later version.
-  This program is distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-  PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-*/
-
-extern "C" {
-  #include <inttypes.h>
-  #include "usiTwiSlave.h"
-  #include <avr/interrupt.h>
-  }
-
-#include "TinyWireS.h"
-#include "Arduino.h"
-
-// Constructors ////////////////////////////////////////////////////////////////
-
-USI_TWI_S::USI_TWI_S(){
-}
-
-
-// Public Methods //////////////////////////////////////////////////////////////
-
-void USI_TWI_S::begin(uint8_t slaveAddr){ // initialize I2C lib
-  usiTwiSlaveInit(slaveAddr); 
-}
-
-void USI_TWI_S::send(uint8_t data){  // send it back to master
-  usiTwiTransmitByte(data);
-}
-
-uint8_t USI_TWI_S::available(){ // the bytes available that haven't been read yet
-  return usiTwiAmountDataInReceiveBuffer(); 
-  //return usiTwiDataInReceiveBuffer(); // This is wrong as far as the Wire API is concerned since it returns boolean and not amount
-}
- 
-uint8_t USI_TWI_S::receive(){ // returns the bytes received one at a time
-  return usiTwiReceiveByte(); 
-}
-
-// sets function called on slave write
-void USI_TWI_S::onReceive( void (*function)(uint8_t) )
-{
-  usi_onReceiverPtr = function;
-}
-
-// sets function called on slave read
-void USI_TWI_S::onRequest( void (*function)(void) )
-{
-  usi_onRequestPtr = function;
-}
-
-// This routine is no longer used now that the usiTwiSlave is completely
-// interrupt driven. The function is maintained here so that programs
-// written for the pre-interrupt driven version will still compile and function.
-void TinyWireS_stop_check()
-{
-  // empty functions
-}
-
-// Implement a delay loop that checks for the stop bit (basically direct copy of the stock arduino implementation from wiring.c)
-// I don't think this function is necessary now that the 
-// usiTwiSlave is completely interrupt driven. I'm not sure, and the function is 
-// behaviorally harmless because TinyWireS_stop_check() is empty, so I'm leaving it alone.
-void tws_delay(unsigned long ms)
-{
-    uint16_t start = (uint16_t)micros();
-    while (ms > 0)
-    {
-        TinyWireS_stop_check();
-        if (((uint16_t)micros() - start) >= 1000)
-        {
-            ms--;
-            start += 1000;
-        }
-    }
-}
-
-// Preinstantiate Objects //////////////////////////////////////////////////////
-
-USI_TWI_S TinyWireS = USI_TWI_S();
-
diff --git a/digital-driver/firmware/TinyWireS/TinyWireS.h b/digital-driver/firmware/TinyWireS/TinyWireS.h
deleted file mode 100644
index ccef042..0000000
--- a/digital-driver/firmware/TinyWireS/TinyWireS.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
-  TinyWireS.h - a wrapper class for Don Blake's usiTwiSlave routines.
-  Provides TWI/I2C Slave functionality on ATtiny processers in Arduino environment.
-  1/23/2011 BroHogan -  brohoganx10 at gmail dot com
-
-  Major credit and thanks to Don Blake for his usiTwiSlave code which makes this possible
-  http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=51467&start=all&postdays=0&postorder=asc
-  (Changed #define USI_START_COND_INT  USISIF (was USICIF) in usiTwiSlave.h)
-
-  NOTE! - It's very important to use pullups on the SDA & SCL lines! More so than with the Wire lib.
-  Current Rx & Tx buffers set at 32 bytes - see usiTwiSlave.h
- 
- USAGE is modeled after the standard Wire library . . .
-  Put in setup():
-	TinyWireS.begin(I2C_SLAVE_ADDR);                 // initialize I2C lib & setup slave's address (7 bit - same as Wire)
-
-  To Receive:
-    someByte = TinyWireS.available(){                // returns the number of bytes in the received buffer
-    someByte = TinyWireS.receive(){                  // returns the next byte in the received buffer
-
-  To Send:
-	TinyWireS.send(uint8_t data){                    // sends a requested byte to master
-	
-  TODO:	(by others!)
-	- onReceive and onRequest handlers are not implimented.
-	- merge this class with TinyWireM for master & slave support in one library
-	
-  This library is free software; you can redistribute it and/or modify it under the
-  terms of the GNU General Public License as published by the Free Software
-  Foundation; either version 2.1 of the License, or any later version.
-  This program is distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-  PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-*/
-
-#ifndef TinyWireS_h
-#define TinyWireS_h
-
-#include <inttypes.h>
-
-
-class USI_TWI_S
-{
-  private:
-	//static uint8_t USI_BytesAvail;
-	
-  public:
- 	USI_TWI_S();
-    void begin(uint8_t I2C_SLAVE_ADDR);
-    void send(uint8_t data);
-    uint8_t available();
-    uint8_t receive();
-    void onReceive( void (*)(uint8_t) );
-    void onRequest( void (*)(void) );
-};
-
-void TinyWireS_stop_check();
-// Implement a delay loop that checks for the stop bit (basically direct copy of the stock arduino implementation from wiring.c)
-void tws_delay(unsigned long);
-
-extern USI_TWI_S TinyWireS;
-
-#endif
-
diff --git a/digital-driver/firmware/TinyWireS/avr_usi_i2c_master.pdf b/digital-driver/firmware/TinyWireS/avr_usi_i2c_master.pdf
deleted file mode 100644
index dc8f460..0000000
--- a/digital-driver/firmware/TinyWireS/avr_usi_i2c_master.pdf
+++ /dev/null
diff --git a/digital-driver/firmware/TinyWireS/avr_usi_i2c_slave.pdf b/digital-driver/firmware/TinyWireS/avr_usi_i2c_slave.pdf
deleted file mode 100644
index e4704c7..0000000
--- a/digital-driver/firmware/TinyWireS/avr_usi_i2c_slave.pdf
+++ /dev/null
diff --git a/digital-driver/firmware/TinyWireS/examples/TinyWireS_Stress_Master/TinyWireS_Stress_Master.ino b/digital-driver/firmware/TinyWireS/examples/TinyWireS_Stress_Master/TinyWireS_Stress_Master.ino
deleted file mode 100644
index d50adb7..0000000
--- a/digital-driver/firmware/TinyWireS/examples/TinyWireS_Stress_Master/TinyWireS_Stress_Master.ino
+++ /dev/null
@@ -1,184 +0,0 @@
-// ---------------------------------
-// Stress test program/example for TinyWireS I2C library.
-// Run this master program on the Arduino Uno R3.
-// Run the other slave program on the Attiny.
-// ---------------------------------
-// Written by Scott Hartog, 2/6/2016
-// This is the I2C master program which runs on on a regular Arduino
-// (not a AtTiny). This program uses the regular Wire library from the Arduino IDE.
-//
-// It performs these steps in a loop:
-//    1. picks a random number of bytes between 1 and 12
-//    2. sends that many bytes of random data to the AtTiny slave within
-//       a single Wire.beginTransmission() / Wire.write() / Wire.endTransmission() set
-//    3. reads that same number of bytes back with a single Wire.requestFrom() call
-//    4. compares the received data to the originally transmitted data
-//    5. displays the number of requests, number of requests with mismatches,
-//       and enough of the data so that the operator can tell it's working.
-//
-#include <Wire.h>
-
-// BREADBOARD SETUP:
-// Arduino Uno R3 (D18/SDA) = I2C SDA 
-//     connect to SDA on slave with external pull-up (~4.7K)
-// Arduino Uno R3 (D19/SCL) = I2C SCL 
-//     connect to SCL on slave with external pull-up (~4.7K)
-// Arduino Uno R3 (D2)
-//     connect to !RST on slave
-//     Can alternatively connect !RST on slave to the Ardiuno "!RESET" pin
-
-#define I2C_SLAVE_ADDR  0x26            // i2c slave address (38, 0x26)
-
-#if defined(ESP8266)
-  // pins that work for Monkey Board ESP8266 12-E
-  // SCL=5, SDA=4
-  #define SLAVE_RESET_PIN 2
-  #define ALL_OK_LED_PIN 16
-  #define OK_LED_PIN 14
-  #define ERROR_LED_PIN 13
-#else
-  // pins that work for Micro Pro, Uno, Mega 2560
-  // reference documentation for SCL and SDA pin locations
-  // Uno SDA=D18, SCL=D19
-  #define SLAVE_RESET_PIN 6
-  #define ALL_OK_LED_PIN 9
-  #define OK_LED_PIN 7
-  #define ERROR_LED_PIN 8
-#endif
-
-uint16_t count = 0;       // total number of passes so far
-uint16_t error_count = 0; // total errors encountered so far
-
-char c_buf[64]; // for creating messages
-
-void setup()
-{
-  // set pin modes 
-  pinMode(SLAVE_RESET_PIN,OUTPUT);  // active low reset to slave device
-  pinMode(OK_LED_PIN,OUTPUT);       // indicates last transaction matched
-  pinMode(ALL_OK_LED_PIN,OUTPUT);   // indicates all transactions so far have matched
-  pinMode(ERROR_LED_PIN,OUTPUT);    // indicates last transaction mismatched
-
-  // init the serial port
-  Serial.begin(9600);
-
-  // print some useful pinnout info for the Arduino
-  //Serial.println(String("SCL:")+String(SCL)+String(", SDA:")+String(SDA));
-  //Serial.println(String("MOSI:")+String(MOSI)+String(", SCK:")+String(SCK));
-
-  // init the Wire object (for I2C)
-  Wire.begin(); 
-
-  // init the i2c clock
-  // default is 100kHz if not changed
-  // Wire.setClock(400000L);  // 400kHz
-  
-  // reset the slave
-  digitalWrite(SLAVE_RESET_PIN, LOW);
-  delay(10);
-  digitalWrite(SLAVE_RESET_PIN, HIGH);
-
-  // set the all okay pin high
-  digitalWrite(ALL_OK_LED_PIN, HIGH);
-  
-  // wait for slave to finish any init sequence
-  delay(2000);
-}
-
-void loop()
-{
-  uint8_t i;
-  uint8_t req_rtn;       // num bytes returned by requestFrom() call
-  uint8_t rand_byte_count;
-  uint8_t out_rand[16];  // data written from master
-  uint8_t in_rand[16];   // data read back from slave
-
-  bool mismatch;
-
-  // count total number of request
-  count++;
-
-  // compute random number of bytes for this pass
-  rand_byte_count = random(16) + 1;
-
-  // force the first three requests to be small so that the tx buffer doesn't overflow
-  // instantly and the user can see at least one successful transaction and some
-  // mismtaches before the usiTwiSlave.c library hangs on the line "while ( !txCount );".
-  if (count <= 3) rand_byte_count = 2;
-
-  // generate, save, and send N random byte values
-  Wire.beginTransmission(I2C_SLAVE_ADDR);
-  for (i = 0; i < rand_byte_count; i++)
-    Wire.write(out_rand[i] = random(256));
-  Wire.endTransmission();
-  
-  // delay 20 milliseconds to accomodate slave onReceive() callback
-  // function. The actual time that slave takes is application dependent, but
-  // just storing the master's transmitted data does not take
-  // anywhere near 20ms.
-  delay(20);
-  
-  // read N bytes from slave
-  req_rtn = Wire.requestFrom(I2C_SLAVE_ADDR, (int)rand_byte_count);      // Request N bytes from slave
-  for (i = 0; i < req_rtn; i++)
-    in_rand[i] = Wire.read();
-
-  // compare in/out data values
-  mismatch = false;
-  for (i = 0; i < rand_byte_count; i++)
-    mismatch = mismatch || (out_rand[i] != in_rand[i]);
-
-  // increment the error counter if the number of byte variables don't match or
-  // if the data itself doesn't match
-  if (mismatch || (rand_byte_count != req_rtn)) 
-  {
-    error_count++;
-    digitalWrite(ERROR_LED_PIN, HIGH);
-    digitalWrite(OK_LED_PIN, LOW);
-    // If there's ever an error, reset the ALL_OK_LED
-    // and it is not set again until the master resets.
-    digitalWrite(ALL_OK_LED_PIN, LOW);
-  }
-  else
-  {
-    digitalWrite(ERROR_LED_PIN, LOW);
-    digitalWrite(OK_LED_PIN, HIGH);
-  }
-
-  // The rest of the program just displays the results to the serial port
-  
-  // display total requests so far and error count so far
-  snprintf(c_buf, sizeof(c_buf), "req: %3d,err: %3d", count, error_count);
-  Serial.println(c_buf);
-
-  // display the random byte count, the number of bytes read back, and "MATCH"/"MISMATCH"
-  snprintf(c_buf, sizeof(c_buf), "size: %2d/%2d,%s", rand_byte_count, req_rtn, rand_byte_count != req_rtn?"MISMATCH  <<--- !!!":"MATCH");
-  Serial.println(c_buf);
-  
-  // display whether the data compare matched or mismatched
-  snprintf(c_buf, sizeof(c_buf), "data: %s", mismatch?"MISMATCH  <<--- !!!":"MATCH");
-  Serial.println(c_buf);
-
-  // send up to three tx/rx bytes so that random data can be
-  // visually verified
-  if (rand_byte_count >= 1)
-  {
-    snprintf(c_buf, sizeof(c_buf), "rand[0]: %02x/%02x", out_rand[0], in_rand[0]);
-    Serial.println(c_buf);
-  }
-
-  if (rand_byte_count >= 2)
-  {
-    snprintf(c_buf, sizeof(c_buf), "rand[1]: %02x/%02x", out_rand[1], in_rand[1]);
-    Serial.println(c_buf);
-  }
-
-  if (rand_byte_count >= 3)
-  {
-    snprintf(c_buf, sizeof(c_buf), "rand[2]: %02x/%02x", out_rand[2], in_rand[2]);
-    Serial.println(c_buf);
-  }
-
-  // delay 1 second so user can watch results
-  delay(1000);
-}
diff --git a/digital-driver/firmware/TinyWireS/examples/TinyWireS_Stress_Slave/TinyWireS_Stress_Slave.ino b/digital-driver/firmware/TinyWireS/examples/TinyWireS_Stress_Slave/TinyWireS_Stress_Slave.ino
deleted file mode 100644
index c7fbe41..0000000
--- a/digital-driver/firmware/TinyWireS/examples/TinyWireS_Stress_Slave/TinyWireS_Stress_Slave.ino
+++ /dev/null
@@ -1,143 +0,0 @@
-// ---------------------------------
-// Stress test program/example for TinyWireS I2C library.
-// Run this slave program on the Attiny.
-// Run the other master program on the Arduino Uno R3.
-// ---------------------------------
-// // Written by Scott Hartog, 2/6/2016, to stress test the TinyWireS library.
-// https://github.com/rambo/TinyWire
-//
-// This project uses the Tiny85 as an I2C slave.
-//
-// The slave program using TinyWireS, running on a Attiny85, receives
-// N bytes of random data in a single receiveEvent() callback and
-// stores that data in a global buffer. It then responds the first requestEvent()
-// callback with that same data. The requestEvent() callback overwrites the data
-// buffer with zeros after responding so it will only respond correctly to the
-// first requestEvent() callback after each receiveEvent() callback. Subsequent
-// requestEvent() will respond with 0xff for all data bytes.
-//
-//
-// SETUP:
-// AtTiny Pin 5 (PB0/SDA) = I2C SDA 
-//     connect to SDA on master with external pull-up (~4.7K)
-// AtTiny Pin 7 (PB0/SCL) = I2C SCL 
-//     connect to SCL on master with external pull-up (~4.7K)
-// AtTiny Pin 1 (PB5/!RST)
-//     connect to reset on master (or just pull-up)
-//
-// Please see credits and usage for usiTwiSlave and TinyWireS in the .h files of 
-// those libraries.
-
-#include <avr/sleep.h>
-#include <avr/wdt.h>
-#include "TinyWireS.h"                  // wrapper class for I2C slave routines
-
-#define I2C_SLAVE_ADDR  0x26            // i2c slave address (38, 0x26)
-
-// turns on code that makes the Tiny85 sleep between transactions
-// This is optional. The Tiny85 current drops from
-// about 2mA to about 20uA when the CPU is put into
-// PowerDown sleep mode.
-#define USE_CPU_SLEEP
-
-// global buffer to store data sent from the master.
-uint8_t master_data[16];
-// global variable to number of bytes sent from the master.
-uint8_t master_bytes;
-
-// Gets called when the ATtiny receives an i2c write slave request
-// This routine runs from the usiTwiSlave interrupt service routine (ISR)
-// so interrupts are disabled while it runs.
-void receiveEvent(uint8_t num_bytes)
-{
-  uint8_t i;
-
-  // save the number of bytes sent from the master
-  master_bytes = num_bytes;
-
-  // store the data from the master into the data buffer
-  for (i = 0; i < master_bytes; i++)
-    master_data[i] = TinyWireS.receive();
-    
-}
-
-// Gets called when the ATtiny receives an i2c read slave request
-// This routine runs from the usiTwiSlave interrupt service routine (ISR)
-// so interrupts are disabled while it runs.
-void requestEvent()
-{
-  uint8_t i;
-  
-  // send the data buffer back to the master
-  for (i = 0; i < master_bytes; i++)
-    TinyWireS.send(master_data[i]);
-
-  // corrupt the byte values in the data buffer
-  // so that any subsequent call won't match
-  for (i = 0; i < master_bytes; i++)
-    master_data[i] += 0x5a;
-
-  // corrupt length of the request, but don't make it zero
-  
-  // if the usiTwiSlave.c is working fine, then this number is completely irrelevant
-  // because the requestEvent() callback will not be called again until
-  // after the next receiveEvent() callback, so the master_data and
-  // master_bytes variables will be overwritten by that call.
-
-  // If the usiTwiSlave.c has the issue of calling the requestFrom() callback
-  // for each byte sent, the buffer will accumulate by this amount *for each byte
-  // in the original request*. (This problem is fixed in the recent version.)
-  // 
-  // Making it zero will obscure the 1-byte send issue in the usiTwiSlave.c
-  // that is being tested.
-  // Making it small will allow a few requests to succeed before the tx buffer
-  // overflows and the usiTwiSlave.c hangs on the "while ( tmphead == txTail );"
-  // line
-  master_bytes = 2; 
-}
-
-void setup()
-{
-  //pinMode(1,OUTPUT);   // This pin can be used for rudimentary debug
-  
-  // initialize the TinyWireS and usiTwiSlave libraries
-  TinyWireS.begin(I2C_SLAVE_ADDR);      // init I2C Slave mode
-
-  // register the onReceive() callback function
-  TinyWireS.onReceive(receiveEvent);
-  
-  // register the onRequest() callback function
-  TinyWireS.onRequest(requestEvent);
-
- // disable the watchdog timer so that it doesn't
-  // cause power-up, code is from datasheet
-  // Clear WDRF in MCUSR – MCU Status Register
-  // MCUSR provides information on which reset source caused an MCU Reset.
-  MCUSR = 0x00;
-  // WDTCR - Watchdog Timer Control Register
-  // Write logical one to WDCE and WDE (must be done before disabling)
-  WDTCR |= ( _BV(WDCE) | _BV(WDE) );
-  // Turn off WDT
-  WDTCR = 0x00;
-
-#ifdef USE_CPU_SLEEP
-  // enable power down sleep mode
-  set_sleep_mode(SLEEP_MODE_PWR_DOWN);  // sleep mode
-  sleep_enable();
-#endif
-
-  sei();                                // enable interrupts
-
-}
-
-void loop()
-{
-
-#ifdef USE_CPU_SLEEP
-  // optionally put the CPU to sleep. It will be woken by a USI interrupt
-  // when it sees a "start condition" on the I2C bus. Everything interesting
-  // happens in the usiTwiSlave ISR.
-  sleep_cpu();
-#endif
-
-}
diff --git a/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_analog/attiny85_i2c_analog.ino b/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_analog/attiny85_i2c_analog.ino
deleted file mode 100644
index 7190c93..0000000
--- a/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_analog/attiny85_i2c_analog.ino
+++ /dev/null
@@ -1,210 +0,0 @@
-/**
- * Example sketch for writing to and reading from a slave in transactional manner
- *
- * NOTE: You must not use delay() or I2C communications will fail, use tws_delay() instead (or preferably some smarter timing system)
- *
- * On write the first byte received is considered the register addres to modify/read
- * On each byte sent or read the register address is incremented (and it will loop back to 0)
- *
- * You can try this with the Arduino I2C REPL sketch at https://github.com/rambo/I2C/blob/master/examples/i2crepl/i2crepl.ino 
- * If you have bus-pirate remember that the older revisions do not like the slave streching the clock, this leads to all sorts of weird behaviour
- * Examples use bus-pirate semantics (like the REPL)
- *
- * The basic idea is:
- *  1. Choose your ADC channel (0-X), use "byte ch = 1;" for example.
- *  2. Combine the channel and conversion start flag to single calue: byte start_on_ch = (ch | _BV(7)); // This is 0x81
- *  3. Write start_on_ch to the first register on the attiny [ 8 0  81 ]
- *  4. Come back later and check the first register [ 8 0 [ r ], if the value is same as ch then the conversion is complete, you can now read the value
- *  5. read the value [ 8 2 [ r r ] (first one is low, second high byte)
- *
- * You need to have at least 8MHz clock on the ATTiny for this to work (and in fact I have so far tested it only on ATTiny85 @8MHz using internal oscillator)
- * Remember to "Burn bootloader" to make sure your chip is in correct mode 
- */
-
-
-/**
- * Pin notes by Suovula, see also http://hlt.media.mit.edu/?p=1229
- *
- * DIP and SOIC have same pinout, however the SOIC chips are much cheaper, especially if you buy more than 5 at a time
- * For nice breakout boards see https://github.com/rambo/attiny_boards
- *
- * Basically the arduino pin numbers map directly to the PORTB bit numbers.
- *
-// I2C
-arduino pin 0 = not(OC1A) = PORTB <- _BV(0) = SOIC pin 5 (I2C SDA, PWM)
-arduino pin 2 =           = PORTB <- _BV(2) = SOIC pin 7 (I2C SCL, Analog 1)
-// Timer1 -> PWM
-arduino pin 1 =     OC1A  = PORTB <- _BV(1) = SOIC pin 6 (PWM)
-arduino pin 3 = not(OC1B) = PORTB <- _BV(3) = SOIC pin 2 (Analog 3)
-arduino pin 4 =     OC1B  = PORTB <- _BV(4) = SOIC pin 3 (Analog 2)
- */
-#define I2C_SLAVE_ADDRESS 0x4 // the 7-bit address (remember to change this when adapting this example)
-// Get this from https://github.com/rambo/TinyWire
-#include <TinyWireS.h>
-// The default buffer size, though we cannot actually affect it by defining it in the sketch
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE ( 16 )
-#endif
-// For the ADC_xxx helpers
-#include <core_adc.h>
-
-// The "registers" we expose to I2C
-volatile uint8_t i2c_regs[] =
-{
-    0x0, // Status register, writing (1<<7 & channel) will start a conversion on that channel, the flag will be set low when conversion is done.
-    0x1, // Averaging count, make this many conversions in row and average the result (well, actually it's a rolling average since we do not want to have the possibility of integer overflows)
-    0x0, // low byte 
-    0x0, // high byte
-};
-const byte reg_size = sizeof(i2c_regs);
-// Tracks the current register pointer position
-volatile byte reg_position;
-// Tracks wheter to start a conversion cycle
-volatile boolean start_conversion;
-// Counter to track where we are averaging
-byte avg_count;
-// Some temp value holders
-int avg_temp1;
-int avg_temp2;
-
-/**
- * This is called for each read request we receive, never put more than one byte of data (with TinyWireS.send) to the 
- * send-buffer when using this callback
- */
-void requestEvent()
-{  
-    TinyWireS.send(i2c_regs[reg_position]);
-    // Increment the reg position on each read, and loop back to zero
-    reg_position++;
-    if (reg_position >= reg_size)
-    {
-        reg_position = 0;
-    }
-}
-
-/**
- * The I2C data received -handler
- *
- * This needs to complete before the next incoming transaction (start, data, restart/stop) on the bus does
- * so be quick, set flags for long running tasks to be called from the mainloop instead of running them directly,
- */
-void receiveEvent(uint8_t howMany)
-{
-    if (howMany < 1)
-    {
-        // Sanity-check
-        return;
-    }
-    if (howMany > TWI_RX_BUFFER_SIZE)
-    {
-        // Also insane number
-        return;
-    }
-
-    reg_position = TinyWireS.receive();
-    howMany--;
-    if (!howMany)
-    {
-        // This write was only to set the buffer for next read
-        return;
-    }
-    while(howMany--)
-    {
-        i2c_regs[reg_position] = TinyWireS.receive();
-        if (   reg_position == 0 // If it was the first register
-            && bitRead(i2c_regs[0], 7) // And the highest bit is set
-            && !ADC_ConversionInProgress() // and we do not actually have a conversion running already
-            )
-        {
-            start_conversion = true;
-        }
-        reg_position++;
-        if (reg_position >= reg_size)
-        {
-            reg_position = 0;
-        }
-    }
-}
-
-
-void setup()
-{
-    // TODO: Tri-state this and wait for input voltage to stabilize 
-    pinMode(3, OUTPUT); // OC1B-, Arduino pin 3, ADC
-    digitalWrite(3, LOW); // Note that this makes the led turn on, it's wire this way to allow for the voltage sensing above.
-
-    pinMode(1, OUTPUT); // OC1A, also The only HW-PWM -pin supported by the tiny core analogWrite
-
-    /**
-     * Reminder: taking care of pull-ups is the masters job
-     */
-
-    TinyWireS.begin(I2C_SLAVE_ADDRESS);
-    TinyWireS.onReceive(receiveEvent);
-    TinyWireS.onRequest(requestEvent);
-
-    
-    // Whatever other setup routines ?
-    
-    digitalWrite(3, HIGH);
-}
-
-void loop()
-{
-    /**
-     * This is the only way we can detect stop condition (http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=984716&sid=82e9dc7299a8243b86cf7969dd41b5b5#984716)
-     * it needs to be called in a very tight loop in order not to miss any (REMINDER: Do *not* use delay() anywhere, use tws_delay() instead).
-     * It will call the function registered via TinyWireS.onReceive(); if there is data in the buffer on stop.
-     */
-    TinyWireS_stop_check();
-
-    // Thus stuff is basically copied from wiring_analog.c
-    if (start_conversion)
-    {
-        //Avoid doubled starts
-        start_conversion = false;
-        byte adcpin = (i2c_regs[0] & 0x7f); // Set the channel from the control reg, dropping the highest bit.
-#if defined( CORE_ANALOG_FIRST )
-        if ( adcpin >= CORE_ANALOG_FIRST ) adcpin -= CORE_ANALOG_FIRST; // allow for channel or pin numbers
-#endif
-        // NOTE: These handy helpers (ADC_xxx) are only present in the tiny-core, for other cores you need to check their wiring_analog.c source.
-        ADC_SetInputChannel( (adc_ic_t)adcpin ); // we need to typecast
-        ADC_StartConversion();
-        // Reset these variables
-        avg_count = 0;
-        avg_temp2 = 0;
-    }
-    
-    if (   bitRead(i2c_regs[0], 7) // We have conversion flag up
-        && !ADC_ConversionInProgress()) // But the conversion is complete
-    {
-        // So handle it
-        avg_temp1 = ADC_GetDataRegister();
-        // Rolling average
-        if (avg_count)
-        {
-            avg_temp2 = (avg_temp2+avg_temp1)/2;
-        }
-        else
-        {
-            avg_temp2 = avg_temp1;
-        }
-        avg_count++;
-        if (avg_count >= i2c_regs[1])
-        {
-            // All done, set the bytes to registers
-            cli();
-            i2c_regs[2] = lowByte(avg_temp2);
-            i2c_regs[3] = highByte(avg_temp2);
-            sei();
-            // And clear the conversion flag so the master knows we're ready
-            bitClear(i2c_regs[0], 7);
-        }
-        else
-        {
-            // Re-trigger conversion
-            ADC_StartConversion();
-        }
-    }
-
-}
diff --git a/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_slave/attiny85_i2c_slave.ino b/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_slave/attiny85_i2c_slave.ino
deleted file mode 100644
index df2532f..0000000
--- a/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_slave/attiny85_i2c_slave.ino
+++ /dev/null
@@ -1,152 +0,0 @@
-/**
- * Example sketch for writing to and reading from a slave in transactional manner
- *
- * NOTE: You must not use delay() or I2C communications will fail, use tws_delay() instead (or preferably some smarter timing system)
- *
- * On write the first byte received is considered the register addres to modify/read
- * On each byte sent or read the register address is incremented (and it will loop back to 0)
- *
- * You can try this with the Arduino I2C REPL sketch at https://github.com/rambo/I2C/blob/master/examples/i2crepl/i2crepl.ino 
- * If you have bus-pirate remember that the older revisions do not like the slave streching the clock, this leads to all sorts of weird behaviour
- *
- * To read third value (register number 2 since counting starts at 0) send "[ 8 2 [ 9 r ]", value read should be 0xBE
- * If you then send "[ 9 r r r ]" you should get 0xEF 0xDE 0xAD as response (demonstrating the register counter looping back to zero)
- *
- * You need to have at least 8MHz clock on the ATTiny for this to work (and in fact I have so far tested it only on ATTiny85 @8MHz using internal oscillator)
- * Remember to "Burn bootloader" to make sure your chip is in correct mode 
- */
-
-
-/**
- * Pin notes by Suovula, see also http://hlt.media.mit.edu/?p=1229
- *
- * DIP and SOIC have same pinout, however the SOIC chips are much cheaper, especially if you buy more than 5 at a time
- * For nice breakout boards see https://github.com/rambo/attiny_boards
- *
- * Basically the arduino pin numbers map directly to the PORTB bit numbers.
- *
-// I2C
-arduino pin 0 = not(OC1A) = PORTB <- _BV(0) = SOIC pin 5 (I2C SDA, PWM)
-arduino pin 2 =           = PORTB <- _BV(2) = SOIC pin 7 (I2C SCL, Analog 1)
-// Timer1 -> PWM
-arduino pin 1 =     OC1A  = PORTB <- _BV(1) = SOIC pin 6 (PWM)
-arduino pin 3 = not(OC1B) = PORTB <- _BV(3) = SOIC pin 2 (Analog 3)
-arduino pin 4 =     OC1B  = PORTB <- _BV(4) = SOIC pin 3 (Analog 2)
- */
-#define I2C_SLAVE_ADDRESS 0x4 // the 7-bit address (remember to change this when adapting this example)
-// Get this from https://github.com/rambo/TinyWire
-#include <TinyWireS.h>
-// The default buffer size, Can't recall the scope of defines right now
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE ( 16 )
-#endif
-
-
-volatile uint8_t i2c_regs[] =
-{
-    0xDE, 
-    0xAD, 
-    0xBE, 
-    0xEF, 
-};
-// Tracks the current register pointer position
-volatile byte reg_position;
-const byte reg_size = sizeof(i2c_regs);
-
-/**
- * This is called for each read request we receive, never put more than one byte of data (with TinyWireS.send) to the 
- * send-buffer when using this callback
- */
-void requestEvent()
-{  
-    TinyWireS.send(i2c_regs[reg_position]);
-    // Increment the reg position on each read, and loop back to zero
-    reg_position++;
-    if (reg_position >= reg_size)
-    {
-        reg_position = 0;
-    }
-}
-
-// TODO: Either update this to use something smarter for timing or remove it alltogether
-void blinkn(uint8_t blinks)
-{
-    digitalWrite(3, HIGH);
-    while(blinks--)
-    {
-        digitalWrite(3, LOW);
-        tws_delay(50);
-        digitalWrite(3, HIGH);
-        tws_delay(100);
-    }
-}
-
-/**
- * The I2C data received -handler
- *
- * This needs to complete before the next incoming transaction (start, data, restart/stop) on the bus does
- * so be quick, set flags for long running tasks to be called from the mainloop instead of running them directly,
- */
-void receiveEvent(uint8_t howMany)
-{
-    if (howMany < 1)
-    {
-        // Sanity-check
-        return;
-    }
-    if (howMany > TWI_RX_BUFFER_SIZE)
-    {
-        // Also insane number
-        return;
-    }
-
-    reg_position = TinyWireS.receive();
-    howMany--;
-    if (!howMany)
-    {
-        // This write was only to set the buffer for next read
-        return;
-    }
-    while(howMany--)
-    {
-        i2c_regs[reg_position] = TinyWireS.receive();
-        reg_position++;
-        if (reg_position >= reg_size)
-        {
-            reg_position = 0;
-        }
-    }
-}
-
-
-void setup()
-{
-    // TODO: Tri-state this and wait for input voltage to stabilize 
-    pinMode(3, OUTPUT); // OC1B-, Arduino pin 3, ADC
-    digitalWrite(3, LOW); // Note that this makes the led turn on, it's wire this way to allow for the voltage sensing above.
-
-    pinMode(1, OUTPUT); // OC1A, also The only HW-PWM -pin supported by the tiny core analogWrite
-
-    /**
-     * Reminder: taking care of pull-ups is the masters job
-     */
-
-    TinyWireS.begin(I2C_SLAVE_ADDRESS);
-    TinyWireS.onReceive(receiveEvent);
-    TinyWireS.onRequest(requestEvent);
-
-    
-    // Whatever other setup routines ?
-    
-    digitalWrite(3, HIGH);
-}
-
-void loop()
-{
-    /**
-     * This is the only way we can detect stop condition (http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=984716&sid=82e9dc7299a8243b86cf7969dd41b5b5#984716)
-     * it needs to be called in a very tight loop in order not to miss any (REMINDER: Do *not* use delay() anywhere, use tws_delay() instead).
-     * It will call the function registered via TinyWireS.onReceive(); if there is data in the buffer on stop.
-     */
-    TinyWireS_stop_check();
-}
diff --git a/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_slave_task/attiny85_i2c_slave_task.ino b/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_slave_task/attiny85_i2c_slave_task.ino
deleted file mode 100644
index 4b3f269..0000000
--- a/digital-driver/firmware/TinyWireS/examples/attiny85_i2c_slave_task/attiny85_i2c_slave_task.ino
+++ /dev/null
@@ -1,246 +0,0 @@
-/**
- * Example sketch for writing to and reading from a slave in transactional manner, it will also blink a led attached to pin 3 (which is the SOIC pin 2)
- * (provided you're using one of my ATTiny85 boards from https://github.com/rambo/attiny_boards with the led soldered) 
- *
- * NOTE: You must not use delay() or I2C communications will fail, use tws_delay() instead (or preferably some smarter timing system, like the Task library used in this example)
- *
- * On write the first byte received is considered the register addres to modify/read
- * On each byte sent or read the register address is incremented (and it will loop back to 0)
- *
- * You can try this with the Arduino I2C REPL sketch at https://github.com/rambo/I2C/blob/master/examples/i2crepl/i2crepl.ino 
- * If you have bus-pirate remember that the older revisions do not like the slave streching the clock, this leads to all sorts of weird behaviour
- *
- * By default this blinks the SOS morse pattern and then has long on/off time to indicate end of pattern, send [ 8 0 32 ] (using the REPL/bus-pirate 
- * semantics) to make the delay per bit smaller (and thus blinking faster). The pattern lenght is calculated from the register size, it would be fairly
- * trivial to make it yet another variable changeable via I2C.
- *
- * You need to have at least 8MHz clock on the ATTiny for this to work (and in fact I have so far tested it only on ATTiny85 @8MHz using internal oscillator)
- * Remember to "Burn bootloader" to make sure your chip is in correct mode 
- */
-
-
-/**
- * Pin notes by Suovula, see also http://hlt.media.mit.edu/?p=1229
- *
- * DIP and SOIC have same pinout, however the SOIC chips are much cheaper, especially if you buy more than 5 at a time
- * For nice breakout boards see https://github.com/rambo/attiny_boards
- *
- * Basically the arduino pin numbers map directly to the PORTB bit numbers.
- *
-// I2C
-arduino pin 0 = not(OC1A) = PORTB <- _BV(0) = SOIC pin 5 (I2C SDA, PWM)
-arduino pin 2 =           = PORTB <- _BV(2) = SOIC pin 7 (I2C SCL, Analog 1)
-// Timer1 -> PWM
-arduino pin 1 =     OC1A  = PORTB <- _BV(1) = SOIC pin 6 (PWM)
-arduino pin 3 = not(OC1B) = PORTB <- _BV(3) = SOIC pin 2 (Analog 3)
-arduino pin 4 =     OC1B  = PORTB <- _BV(4) = SOIC pin 3 (Analog 2)
- */
-#define I2C_SLAVE_ADDRESS 0x4 // the 7-bit address (remember to change this when adapting this example)
-// Get this from https://github.com/rambo/TinyWire
-#include <TinyWireS.h>
-// The default buffer size, Can't recall the scope of defines right now
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE ( 16 )
-#endif
-// Get this library from http://bleaklow.com/files/2010/Task.tar.gz 
-// and read http://bleaklow.com/2010/07/20/a_very_simple_arduino_task_manager.html for background and instructions
-#include <Task.h>
-#include <TaskScheduler.h>
-
-// The led is connected so that the tiny sinks current
-#define LED_ON LOW
-#define LED_OFF HIGH
-
-// The I2C registers
-volatile uint8_t i2c_regs[] =
-{
-    150, // Delay between each position (ms, remeber that this isa byte so 255 is max)
-    B10101000, // SOS pattern 
-    B01110111, 
-    B01110001,
-    B01010000, 
-    B00000000,
-    B11111111, // Long on and off to mark end of pattern
-    B00000000,
-};
-// Tracks the current register pointer position
-volatile byte reg_position;
-const byte reg_size = sizeof(i2c_regs);
-
-
-/**
- * BEGIN: PatternBlinker task based on the Task library Blinker example
- */
-// Timed task to blink a LED.
-const byte pattern_lenght = (sizeof(i2c_regs)-1) * 8; // bits (first is the speed, rest is the pattern)
-class PatternBlinker : public TimedTask
-{
-public:
-    // Create a new blinker for the specified pin and rate.
-    PatternBlinker(uint8_t _pin);
-    virtual void run(uint32_t now);
-private:
-    uint8_t pin;      // LED pin.
-    uint8_t pattern_position; // Used to calcuate the register and bit offset
-};
-
-PatternBlinker::PatternBlinker(uint8_t _pin)
-: TimedTask(millis()),
-  pin(_pin)
-{
-    pinMode(pin, OUTPUT);     // Set pin for output.
-}
-
-void PatternBlinker::run(uint32_t now)
-{
-    // Start by setting the next runtime
-    incRunTime(i2c_regs[0]);
-
-    // Written out for clear code, the complier might optimize it to something more efficient even without it being unrolled into one line
-    byte reg = i2c_regs[1+(pattern_position/8)]; // Get the register where the bit pattern position is stored
-    byte shift_amount = 7 - (pattern_position % 7); // To have "natural" left-to-right pattern flow.
-    bool state = (reg >> shift_amount) & 0x1;
-    if (state) {
-        digitalWrite(pin, LED_ON);
-    } else {
-        digitalWrite(pin, LED_OFF);
-    }
-    // Calculate the next pattern position
-    pattern_position = (pattern_position+1) % pattern_lenght;
-}
-/**
- * END: PatternBlinker task copied from the Task library example
- */
-/**
- * BEGIN: I2C Stop flag checker
- *
- * This task needs to run almost all the time due to the USI I2C implementation limitations
- *
- * So I2CStopCheck_YIELD_TICKS below is used to specify how often the task is run, not it's every 4 ticks
- */
-#define I2CStopCheck_YIELD_TICKS 4
-class I2CStopCheck : public Task
-{
-public:
-    I2CStopCheck();
-    virtual void run(uint32_t now);
-    virtual bool canRun(uint32_t now);
-private:
-    uint8_t yield_counter; // Incremented on each canRun call, used to yield to other tasks.
-};
-
-I2CStopCheck::I2CStopCheck()
-: Task()
-{
-}
-
-// We can't just return true since then no other task could ever run (since we have the priority)
-bool I2CStopCheck::canRun(uint32_t now)
-{
-    yield_counter++;
-    bool ret = false;
-    if (yield_counter == I2CStopCheck_YIELD_TICKS)
-    {
-        ret = true;
-        yield_counter = 0;
-    }
-    return ret;
-}
-
-void I2CStopCheck::run(uint32_t now)
-{
-    TinyWireS_stop_check();
-}
-/**
- * END: I2C Stop flag checker
- */
-
-// Create the tasks.
-PatternBlinker blinker(3);
-I2CStopCheck checker;
-
-// Tasks are in priority order, only one task is run per tick
-Task *tasks[] = { &checker, &blinker, };
-TaskScheduler sched(tasks, NUM_TASKS(tasks));
-
-
-/**
- * This is called for each read request we receive, never put more than one byte of data (with TinyWireS.send) to the 
- * send-buffer when using this callback
- */
-void requestEvent()
-{  
-    TinyWireS.send(i2c_regs[reg_position]);
-    // Increment the reg position on each read, and loop back to zero
-    reg_position++;
-    if (reg_position >= reg_size)
-    {
-        reg_position = 0;
-    }
-}
-
-/**
- * The I2C data received -handler
- *
- * This needs to complete before the next incoming transaction (start, data, restart/stop) on the bus does
- * so be quick, set flags for long running tasks to be called from the mainloop instead of running them directly,
- */
-void receiveEvent(uint8_t howMany)
-{
-    if (howMany < 1)
-    {
-        // Sanity-check
-        return;
-    }
-    if (howMany > TWI_RX_BUFFER_SIZE)
-    {
-        // Also insane number
-        return;
-    }
-
-    reg_position = TinyWireS.receive();
-    howMany--;
-    if (!howMany)
-    {
-        // This write was only to set the buffer for next read
-        return;
-    }
-    while(howMany--)
-    {
-        i2c_regs[reg_position] = TinyWireS.receive();
-        reg_position++;
-        if (reg_position >= reg_size)
-        {
-            reg_position = 0;
-        }
-    }
-}
-
-
-void setup()
-{
-    // TODO: Tri-state this and wait for input voltage to stabilize 
-    pinMode(3, OUTPUT); // OC1B-, Arduino pin 3, ADC
-    digitalWrite(3, LED_ON); // Note that this makes the led turn on, it's wire this way to allow for the voltage sensing above.
-
-    pinMode(1, OUTPUT); // OC1A, also The only HW-PWM -pin supported by the tiny core analogWrite
-
-    /**
-     * Reminder: taking care of pull-ups is the masters job
-     */
-
-    TinyWireS.begin(I2C_SLAVE_ADDRESS);
-    TinyWireS.onReceive(receiveEvent);
-    TinyWireS.onRequest(requestEvent);
-
-    
-    // Whatever other setup routines ?
-    
-    digitalWrite(3, LED_OFF);
-}
-
-void loop()
-{
-    // Run the scheduler - never returns.
-    sched.run();
-}
diff --git a/digital-driver/firmware/TinyWireS/keywords.txt b/digital-driver/firmware/TinyWireS/keywords.txt
deleted file mode 100644
index ccc0b46..0000000
--- a/digital-driver/firmware/TinyWireS/keywords.txt
+++ /dev/null
@@ -1,27 +0,0 @@
-#######################################
-# Syntax Coloring Map For TinyWireS
-#######################################
-
-#######################################
-# Datatypes (KEYWORD1)
-#######################################
-
-#######################################
-# Methods and Functions (KEYWORD2)
-#######################################
-
-begin	KEYWORD2
-send	KEYWORD2
-available	KEYWORD2
-receive	KEYWORD2
-
-#######################################
-# Instances (KEYWORD2)
-#######################################
-
-TinyWireS	KEYWORD2
-
-#######################################
-# Constants (LITERAL1)
-#######################################
-
diff --git a/digital-driver/firmware/TinyWireS/usiTwiSlave.c b/digital-driver/firmware/TinyWireS/usiTwiSlave.c
deleted file mode 100644
index a263184..0000000
--- a/digital-driver/firmware/TinyWireS/usiTwiSlave.c
+++ /dev/null
@@ -1,748 +0,0 @@
-/********************************************************************************
-
-USI TWI Slave driver.
-
-Created by Donald R. Blake. donblake at worldnet.att.net
-Adapted by Jochen Toppe, jochen.toppe at jtoee.com
-
----------------------------------------------------------------------------------
-
-Created from Atmel source files for Application Note AVR312: Using the USI Module
-as an I2C slave.
-
-This program is free software; you can redistribute it and/or modify it under the
-terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2 of the License, or (at your option) any later
-version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
----------------------------------------------------------------------------------
-
-Change Activity:
-
-    Date       Description
-   ------      -------------
-  16 Mar 2007  Created.
-  27 Mar 2007  Added support for ATtiny261, 461 and 861.
-  26 Apr 2007  Fixed ACK of slave address on a read.
-  04 Jul 2007  Fixed USISIF in ATtiny45 def
-  12 Dev 2009  Added callback functions for data requests
-  06 Feb 2016  Minor change to allow mutli-byte requestFrom() from master.
-  10 Feb 2016  Simplied RX/TX buffer code and allowed use of full buffer.
-  13 Feb 2016  Made USI_RECEIVE_CALLBACK() callback fully interrupt-driven
-  12 Dec 2016  Added support for ATtiny167
-  23 Dec 2017  Fixed repeated restart (which broke when making receive callback
-                interrupt-driven)
-
-********************************************************************************/
-
-
-/********************************************************************************
-                                    includes
-********************************************************************************/
-
-#include <avr/io.h>
-#include <avr/interrupt.h>
-
-#include "usiTwiSlave.h"
-//#include "../common/util.h"
-
-
-/********************************************************************************
-                            device dependent defines
-********************************************************************************/
-
-#if defined( __AVR_ATtiny167__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-#if defined( __AVR_ATtiny2313__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB5
-#  define PORT_USI_SCL        PB7
-#  define PIN_USI_SDA         PINB5
-#  define PIN_USI_SCL         PINB7
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-#if defined(__AVR_ATtiny84__) | \
-     defined(__AVR_ATtiny44__)
-#  define DDR_USI             DDRA
-#  define PORT_USI            PORTA
-#  define PIN_USI             PINA
-#  define PORT_USI_SDA        PORTA6
-#  define PORT_USI_SCL        PORTA4
-#  define PIN_USI_SDA         PINA6
-#  define PIN_USI_SCL         PINA4
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATtiny25__ ) | \
-     defined( __AVR_ATtiny45__ ) | \
-     defined( __AVR_ATtiny85__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATtiny26__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_STRT_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATtiny261__ ) | \
-      defined( __AVR_ATtiny461__ ) | \
-      defined( __AVR_ATtiny861__ )
-#  define DDR_USI             DDRB
-#  define PORT_USI            PORTB
-#  define PIN_USI             PINB
-#  define PORT_USI_SDA        PB0
-#  define PORT_USI_SCL        PB2
-#  define PIN_USI_SDA         PINB0
-#  define PIN_USI_SCL         PINB2
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVF_vect
-#endif
-
-#if defined( __AVR_ATmega165__ ) | \
-     defined( __AVR_ATmega325__ ) | \
-     defined( __AVR_ATmega3250__ ) | \
-     defined( __AVR_ATmega645__ ) | \
-     defined( __AVR_ATmega6450__ ) | \
-     defined( __AVR_ATmega329__ ) | \
-     defined( __AVR_ATmega3290__ )
-#  define DDR_USI             DDRE
-#  define PORT_USI            PORTE
-#  define PIN_USI             PINE
-#  define PORT_USI_SDA        PE5
-#  define PORT_USI_SCL        PE4
-#  define PIN_USI_SDA         PINE5
-#  define PIN_USI_SCL         PINE4
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-#if defined( __AVR_ATmega169__ )
-#  define DDR_USI             DDRE
-#  define PORT_USI            PORTE
-#  define PIN_USI             PINE
-#  define PORT_USI_SDA        PE5
-#  define PORT_USI_SCL        PE4
-#  define PIN_USI_SDA         PINE5
-#  define PIN_USI_SCL         PINE4
-#  define USI_START_COND_INT  USISIF
-#  define USI_START_VECTOR    USI_START_vect
-#  define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
-#endif
-
-// These macros make the stop condition detection code more readable.
-#define USI_PINS_SCL_SDA ( ( 1 << PIN_USI_SDA ) | ( 1 << PIN_USI_SCL ) )
-#define USI_PINS_SDA     ( 1 << PIN_USI_SDA )
-#define USI_PINS_SCL     ( 1 << PIN_USI_SCL )
-
-/********************************************************************************
-
-                        functions implemented as macros
-
-********************************************************************************/
-
-#define SET_USI_TO_SEND_ACK( ) \
-{ \
-  /* prepare ACK, ack is a zero */ \
-  USIDR = 0; \
-  /* set SDA as output */ \
-  DDR_USI |= ( 1 << PORT_USI_SDA ); \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR = \
-       ( 0 << USI_START_COND_INT ) | \
-       ( 1 << USIOIF ) | ( 1 << USIPF ) | \
-       ( 1 << USIDC )| \
-       /* set USI counter to shift 1 bit */ \
-       ( 0x0E << USICNT0 ); \
-}
-
-#define SET_USI_TO_READ_ACK( ) \
-{ \
-  /* set SDA as input */ \
-  DDR_USI &= ~( 1 << PORT_USI_SDA ); \
-  /* prepare ACK */ \
-  USIDR = 0; \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR = \
-       ( 0 << USI_START_COND_INT ) | \
-       ( 1 << USIOIF ) | \
-       ( 1 << USIPF ) | \
-       ( 1 << USIDC ) | \
-       /* set USI counter to shift 1 bit */ \
-       ( 0x0E << USICNT0 ); \
-}
-
-#define SET_USI_TO_TWI_START_CONDITION_MODE( ) \
-{ \
-  USICR = \
-       /* enable Start Condition Interrupt, disable Overflow Interrupt */ \
-       ( 1 << USISIE ) | ( 0 << USIOIE ) | \
-       /* set USI in Two-wire mode, no USI Counter overflow hold */ \
-       ( 1 << USIWM1 ) | ( 0 << USIWM0 ) | \
-       /* Shift Register Clock Source = External, positive edge */ \
-       /* 4-Bit Counter Source = external, both edges */ \
-       ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) | \
-       /* no toggle clock-port pin */ \
-       ( 0 << USITC ); \
-  USISR = \
-        /* clear all interrupt flags, except Start Cond */ \
-        ( 0 << USI_START_COND_INT ) | ( 1 << USIOIF ) | ( 1 << USIPF ) | \
-        ( 1 << USIDC ) | ( 0x0 << USICNT0 ); \
-}
-
-#define SET_USI_TO_SEND_DATA( ) \
-{ \
-  /* set SDA as output */ \
-  DDR_USI |=  ( 1 << PORT_USI_SDA ); \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR    =  \
-       ( 0 << USI_START_COND_INT ) | ( 1 << USIOIF ) | ( 1 << USIPF ) | \
-       ( 1 << USIDC) | \
-       /* set USI to shift out 8 bits */ \
-       ( 0x0 << USICNT0 ); \
-}
-
-#define SET_USI_TO_READ_DATA( ) \
-{ \
-  /* set SDA as input */ \
-  DDR_USI &= ~( 1 << PORT_USI_SDA ); \
-  /* clear all interrupt flags, except Start Cond */ \
-  USISR    = \
-       ( 0 << USI_START_COND_INT ) | ( 1 << USIOIF ) | \
-       ( 1 << USIPF ) | ( 1 << USIDC ) | \
-       /* set USI to shift out 8 bits */ \
-       ( 0x0 << USICNT0 ); \
-}
-
-#define USI_RECEIVE_CALLBACK() \
-{ \
-    if (usi_onReceiverPtr) \
-    { \
-        if (usiTwiAmountDataInReceiveBuffer()) \
-        { \
-            usi_onReceiverPtr(usiTwiAmountDataInReceiveBuffer()); \
-        } \
-    } \
-}
-
-#define USI_REQUEST_CALLBACK() \
-{ \
-    if(usi_onRequestPtr) usi_onRequestPtr(); \
-}
-
-/********************************************************************************
-
-                                   typedef's
-
-********************************************************************************/
-
-typedef enum
-{
-  USI_SLAVE_CHECK_ADDRESS                = 0x00,
-  USI_SLAVE_SEND_DATA                    = 0x01,
-  USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA = 0x02,
-  USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA   = 0x03,
-  USI_SLAVE_REQUEST_DATA                 = 0x04,
-  USI_SLAVE_GET_DATA_AND_SEND_ACK        = 0x05
-} overflowState_t;
-
-
-
-/********************************************************************************
-
-                                local variables
-
-********************************************************************************/
-
-static uint8_t                  slaveAddress;
-static uint8_t                  sleep_enable_bit;
-static uint8_t                  in_transaction;
-static volatile overflowState_t overflowState;
-
-
-static uint8_t          rxBuf[ TWI_RX_BUFFER_SIZE ];
-static volatile uint8_t rxHead;
-static volatile uint8_t rxTail;
-static volatile uint8_t rxCount;
-
-static uint8_t          txBuf[ TWI_TX_BUFFER_SIZE ];
-static volatile uint8_t txHead;
-static volatile uint8_t txTail;
-static volatile uint8_t txCount;
-
-
-
-/********************************************************************************
-
-                                local functions
-
-********************************************************************************/
-
-// flushes the TWI buffers
-
-static void flushTwiBuffers( void )
-{
-  rxTail = 0;
-  rxHead = 0;
-  rxCount = 0;
-  txTail = 0;
-  txHead = 0;
-  txCount = 0;
-} // end flushTwiBuffers
-
-
-
-/********************************************************************************
-
-                                public functions
-
-********************************************************************************/
-
-// initialise USI for TWI slave mode
-
-void usiTwiSlaveInit( uint8_t ownAddress )
-{
-  // initialize the TX and RX buffers to empty
-  flushTwiBuffers( );
-
-  slaveAddress = ownAddress;
-
-  // In Two Wire mode (USIWM1, USIWM0 = 1X), the slave USI will pull SCL
-  // low when a start condition is detected or a counter overflow (only
-  // for USIWM1, USIWM0 = 11).  This inserts a wait state.  SCL is released
-  // by the ISRs (USI_START_vect and USI_OVERFLOW_vect).
-
-  // Set SCL and SDA as output
-  DDR_USI |= ( 1 << PORT_USI_SCL ) | ( 1 << PORT_USI_SDA );
-
-  // set SCL high
-  PORT_USI |= ( 1 << PORT_USI_SCL );
-
-  // set SDA high
-  PORT_USI |= ( 1 << PORT_USI_SDA );
-
-  // Set SDA as input
-  DDR_USI &= ~( 1 << PORT_USI_SDA );
-
-  USICR =
-       // enable Start Condition Interrupt
-       ( 1 << USISIE ) |
-       // disable Overflow Interrupt
-       ( 0 << USIOIE ) |
-       // set USI in Two-wire mode, no USI Counter overflow hold
-       ( 1 << USIWM1 ) | ( 0 << USIWM0 ) |
-       // Shift Register Clock Source = external, positive edge
-       // 4-Bit Counter Source = external, both edges
-       ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) |
-       // no toggle clock-port pin
-       ( 0 << USITC );
-
-  // clear all interrupt flags and reset overflow counter
-
-  USISR = ( 1 << USI_START_COND_INT ) | ( 1 << USIOIF ) | ( 1 << USIPF ) | ( 1 << USIDC );
-
-  // The 'in_transaction' variable remembers if the usiTwiSlave driver is in the middle of
-  // an i2c transaction. Initialize it to zero
-  in_transaction = 0;
-
-} // end usiTwiSlaveInit
-
-
-bool usiTwiDataInTransmitBuffer(void)
-{
-
-  // return 0 (false) if the receive buffer is empty
-  return txCount;
-
-} // end usiTwiDataInTransmitBuffer
-
-
-// put data in the transmission buffer, wait if buffer is full
-
-void usiTwiTransmitByte( uint8_t data )
-{
-
-  // wait for free space in buffer
-  while ( txCount == TWI_TX_BUFFER_SIZE) ;
-
-  // store data in buffer
-  txBuf[ txHead ] = data;
-  txHead = ( txHead + 1 ) & TWI_TX_BUFFER_MASK;
-  txCount++;
-
-} // end usiTwiTransmitByte
-
-
-// return a byte from the receive buffer, wait if buffer is empty
-
-uint8_t usiTwiReceiveByte( void )
-{
-  uint8_t rtn_byte;
-
-  // wait for Rx data
-  while ( !rxCount );
-
-  rtn_byte = rxBuf [ rxTail ];
-  // calculate buffer index
-  rxTail = ( rxTail + 1 ) & TWI_RX_BUFFER_MASK;
-  rxCount--;
-
-  // return data from the buffer.
-  return rtn_byte;
-
-} // end usiTwiReceiveByte
-
-
-uint8_t usiTwiAmountDataInReceiveBuffer(void)
-{
-    return rxCount;
-}
-
-
-/********************************************************************************
-
-                            USI Start Condition ISR
-
-********************************************************************************/
-
-ISR( USI_START_VECTOR )
-{
-  uint8_t usi_pins;
-  // http://www.atmel.com/webdoc/AVRLibcReferenceManual/group__avr__interrupts.html
-
-  // Notes about ISR. The compiler in the Arduino IDE handles some of the
-  // basic ISR plumbing (unless the "ISR_NAKED" attribute is applied).
-  //   * The AVR processor resets the SREG.I bit when jumping into an ISR
-  //   * The compiler automatically adds code to save SREG
-  //   * < user's ISR code goes here >
-  //   * The compiler automatically adds code to restore SREG
-  //   * The compiler automatically uses the RETI instruction to return from the ISR.
-  //     The RETI instruction enables interrupts after the return from ISR.
-  // The compiler behavior can be altered with attributes into the ISR declaration;
-  // however, the description above is the default.
-
-  // cli() call is not necessary. Processor disables interrupts when
-  // jumping to an ISR
-
-  // no need to save the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  if ( !in_transaction )
-  {
-    // remeber the sleep enable bit when entering the ISR
-    sleep_enable_bit = MCUCR & ( 1 << SE );
-
-    // clear the sleep enable bit to prevent the CPU from entering sleep mode while executing this ISR.
-    MCUCR &= ~( 1 << SE );
-  }
-
-  // set default starting conditions for new TWI package
-  overflowState = USI_SLAVE_CHECK_ADDRESS;
-
-  // set SDA as input
-  DDR_USI &= ~( 1 << PORT_USI_SDA );
-
-  // the start condition is that the master pulls SDA low.
-
-  // wait for SCL to go low to ensure the Start Condition has completed (the
-  // start detector will hold SCL low ) - if a Stop Condition arises then leave
-  // the interrupt to prevent waiting forever - don't use USISR to test for Stop
-  // Condition as in Application Note AVR312 because the Stop Condition Flag is
-  // going to be set from the last TWI sequence
-
-  // while SCL is high and SDA is low
-  while  ( ( usi_pins = PIN_USI & USI_PINS_SCL_SDA ) == USI_PINS_SCL );
-
-  // if SDA line was low at SCL edge, then start condition occurred
-  if ( !( usi_pins & USI_PINS_SDA ) )
-  {
-    // a Stop Condition did not occur
-    
-    // Execute callback if this is a repeated start
-    if (in_transaction)
-    {
-        USI_RECEIVE_CALLBACK();
-    }
-
-    USICR =
-         // keep Start Condition Interrupt enabled to detect RESTART
-         ( 1 << USISIE ) |
-         // enable Overflow Interrupt
-         ( 1 << USIOIE ) |
-         // set USI in Two-wire mode, hold SCL low on USI Counter overflow
-         ( 1 << USIWM1 ) | ( 1 << USIWM0 ) |
-         // Shift Register Clock Source = External, positive edge
-         // 4-Bit Counter Source = external, both edges
-         ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) |
-         // no toggle clock-port pin
-         ( 0 << USITC );
-         
-    //remember that the USI is in a valid i2c transaction
-    in_transaction = 1;
-
-  }
-  else
-  {
-    // a Stop Condition did occur
-
-    USICR =
-         // enable Start Condition Interrupt
-         ( 1 << USISIE ) |
-         // disable Overflow Interrupt
-         ( 0 << USIOIE ) |
-         // set USI in Two-wire mode, no USI Counter overflow hold
-         ( 1 << USIWM1 ) | ( 0 << USIWM0 ) |
-         // Shift Register Clock Source = external, positive edge
-         // 4-Bit Counter Source = external, both edges
-         ( 1 << USICS1 ) | ( 0 << USICS0 ) | ( 0 << USICLK ) |
-         // no toggle clock-port pin
-         ( 0 << USITC );
-
-    //no longer in valid i2c transaction
-    in_transaction = 0;
-    // restore the sleep enable bit
-    MCUCR |= sleep_enable_bit;
-
-  } // end if
-
-  USISR =
-       // clear interrupt flags - resetting the Start Condition Flag will
-       // release SCL
-       ( 1 << USI_START_COND_INT ) | ( 1 << USIOIF ) |
-       ( 1 << USIPF ) |( 1 << USIDC ) |
-       // set USI to sample 8 bits (count 16 external SCL pin toggles)
-       ( 0x0 << USICNT0);
-
-  // no need to restore the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  // The compiler automatically uses an RETI instruction to return when using the
-  // ISR construct without modifying attributes.
-
-} // end ISR( USI_START_VECTOR )
-
-
-
-/********************************************************************************
-
-                                USI Overflow ISR
-
-Handles all the communication.
-
-Only disabled when waiting for a new Start Condition.
-
-********************************************************************************/
-
-ISR( USI_OVERFLOW_VECTOR )
-{
-  uint8_t finished;
-  uint8_t usi_pins;
-
-  // http://www.atmel.com/webdoc/AVRLibcReferenceManual/group__avr__interrupts.html
-
-  // Notes about ISR. The compiler in the Arduino IDE handles some of the
-  // basic ISR plumbing.
-  //   * The AVR processor resets the SREG.I bit when jumping into an ISR
-  //   * The compiler automatically adds code to save the SREG
-  //   * < user's ISR code goes here >
-  //   * The compiler automatically adds code to restore the SREG
-  //   * The compiler automatically uses the RETI instruction to return from the ISR.
-  //     The RETI insturction enables interrupts after the return from ISR.
-  // The compiler behavior can be altered with attributes into the ISR declaration;
-  // however, the description above is the default.
-
-  // cli() call is not necessary. Processor disables interrupts when
-  // jumping to an ISR
-
-  // no need to save the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  // The ISR is only ever entered because the ISR(USI_START_VECTOR) interrupt
-  // routine ran first. That routine saved the sleep mode and disabled sleep.
-
-  // Most of the time this routine exits, it has setup the USI to shift in/out bits
-  // and is expected to re-entered because of the USI overflow interrupt. Track whether or
-  // not the transaction is completely finished.
-  finished = 0;
-
-
-  switch ( overflowState )
-  {
-
-    // Address mode: check address and send ACK (and next USI_SLAVE_SEND_DATA) if OK,
-    // else reset USI
-    case USI_SLAVE_CHECK_ADDRESS:
-      if ( ( USIDR == 0 ) || ( ( USIDR >> 1 ) == slaveAddress) )
-      {
-        if ( USIDR & 0x01 )
-        {
-          overflowState = USI_SLAVE_SEND_DATA;
-        }
-        else
-        {
-          overflowState = USI_SLAVE_REQUEST_DATA;
-        } // end if
-
-        // ack the start frame
-        // sets up the USI to pull SDA low and clock one bit (two edges)
-        SET_USI_TO_SEND_ACK( );
-      }
-      else
-      {
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-        finished = 1;
-      }
-      break;
-
-    // master-read / slave-send: check reply and goto USI_SLAVE_SEND_DATA if OK,
-    // else reset USI
-    case USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA:
-      // Execute request callback for each byte requested, as this is the intended
-      // behavior of this library
-      USI_REQUEST_CALLBACK();
-      if ( USIDR )
-      {
-        // if NACK, the master does not want more data
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-        finished = 1;
-        break;
-      }
-      // from here we just drop straight into USI_SLAVE_SEND_DATA if the
-      // master sent an ACK
-
-    // copy data from buffer to USIDR and set USI to shift byte
-    // next USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA
-    case USI_SLAVE_SEND_DATA:
-      // Get data from Buffer
-      if ( txCount )
-      {
-        USIDR = txBuf[ txTail ];
-        txTail = ( txTail + 1 ) & TWI_TX_BUFFER_MASK;
-        txCount--;
-
-        overflowState = USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA;
-        SET_USI_TO_SEND_DATA( );
-      }
-      else
-      {
-        // the buffer is empty
-        SET_USI_TO_READ_ACK( ); // This might be neccessary sometimes see http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=805227#805227
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-      } // end if
-      break;
-
-    // set USI to sample reply from master
-    // next USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA
-    case USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA:
-      overflowState = USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA;
-      SET_USI_TO_READ_ACK( );
-      break;
-
-    // master-send / slave-receive: set USI to sample data from master, next
-    // USI_SLAVE_GET_DATA_AND_SEND_ACK
-    case USI_SLAVE_REQUEST_DATA:
-      overflowState = USI_SLAVE_GET_DATA_AND_SEND_ACK;
-      SET_USI_TO_READ_DATA( );
-
-      // with the SET_USI_TO_READ_DATA() macro call above, the USI has
-      // been setup to catch the next byte if the master sends one.
-      // while that's going on, look for a stop condition here which
-      // is when the SDA line goes high after the SCL line;
-
-      // wait until SCL goes high
-      while  ( ! ( ( usi_pins = PIN_USI & USI_PINS_SCL_SDA ) & USI_PINS_SCL ) );
-
-      // if SDA line was high at SCL edge, then not a stop condition
-      if ( usi_pins & USI_PINS_SDA )
-        break;
-
-      // wait until SCL goes low or SDA goes high
-      while  ( ( usi_pins = PIN_USI & USI_PINS_SCL_SDA ) == USI_PINS_SCL );
-
-      // if both SCL and SDA are high, then stop condition occurred
-      if ( usi_pins == USI_PINS_SCL_SDA )
-      {
-        USI_RECEIVE_CALLBACK();
-        SET_USI_TO_TWI_START_CONDITION_MODE( );
-        finished = 1;
-      }
-
-      break;
-
-    // copy data from USIDR and send ACK
-    // next USI_SLAVE_REQUEST_DATA
-    case USI_SLAVE_GET_DATA_AND_SEND_ACK:
-      // put data into buffer
-      // check buffer size
-      if ( rxCount < TWI_RX_BUFFER_SIZE )
-      {
-        rxBuf[ rxHead ] = USIDR;
-        rxHead = ( rxHead + 1 ) & TWI_RX_BUFFER_MASK;
-        rxCount++;
-      } else {
-        // overrun
-        // drop data
-      }
-      // next USI_SLAVE_REQUEST_DATA
-      overflowState = USI_SLAVE_REQUEST_DATA;
-      SET_USI_TO_SEND_ACK( );
-      break;
-
-  } // end switch
-
-  if (finished)
-  {
-    //no longer in valid i2c transaction
-    in_transaction = 0;
-    // restore the sleep enable bit
-    // note that this allows sleep -- it does not cause sleep
-    MCUCR |= sleep_enable_bit;
-  }
-
-  // no need to restore the SREG. The compiler does this automatically when using the
-  // ISR construct without modifying attributes.
-
-  // The compiler automatically uses an RETI instruction to return when using the
-  // ISR construct without modifying attributes.
-
-} // end ISR( USI_OVERFLOW_VECTOR )
diff --git a/digital-driver/firmware/TinyWireS/usiTwiSlave.h b/digital-driver/firmware/TinyWireS/usiTwiSlave.h
deleted file mode 100644
index 88b9445..0000000
--- a/digital-driver/firmware/TinyWireS/usiTwiSlave.h
+++ /dev/null
@@ -1,96 +0,0 @@
-/********************************************************************************
-
-Header file for the USI TWI Slave driver.
-
-Created by Donald R. Blake
-donblake at worldnet.att.net
-
----------------------------------------------------------------------------------
-
-Created from Atmel source files for Application Note AVR312: Using the USI Module
-as an I2C slave.
-
-This program is free software; you can redistribute it and/or modify it under the
-terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2 of the License, or (at your option) any later
-version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
----------------------------------------------------------------------------------
-
-Change Activity:
-
-    Date       Description
-   ------      -------------
-  15 Mar 2007  Created.
-
-********************************************************************************/
-
-
-
-#ifndef _USI_TWI_SLAVE_H_
-#define _USI_TWI_SLAVE_H_
-
-
-
-/********************************************************************************
-
-                                    includes
-
-********************************************************************************/
-
-#include <stdbool.h>
-#include <avr/sleep.h>
-
-
-
-/********************************************************************************
-
-                                   prototypes
-
-********************************************************************************/
-
-void    usiTwiSlaveInit( uint8_t );
-void    usiTwiTransmitByte( uint8_t );
-uint8_t usiTwiReceiveByte( void );
-bool    usiTwiDataInTransmitBuffer(void);
-uint8_t usiTwiAmountDataInReceiveBuffer(void);
-// on_XXX handler pointers
-void    (*usi_onRequestPtr)(void);
-void    (*usi_onReceiverPtr)(uint8_t);
-
-
-/********************************************************************************
-
-                           driver buffer definitions
-
-********************************************************************************/
-
-// permitted RX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256
-
-#ifndef TWI_RX_BUFFER_SIZE
-#define TWI_RX_BUFFER_SIZE  ( 16 )
-#endif
-#define TWI_RX_BUFFER_MASK  ( TWI_RX_BUFFER_SIZE - 1 )
-
-#if ( TWI_RX_BUFFER_SIZE & TWI_RX_BUFFER_MASK )
-#  error TWI RX buffer size is not a power of 2
-#endif
-
-// permitted TX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256
-
-#ifndef TWI_TX_BUFFER_SIZE
-#define TWI_TX_BUFFER_SIZE ( 16 )
-#endif
-#define TWI_TX_BUFFER_MASK ( TWI_TX_BUFFER_SIZE - 1 )
-
-#if ( TWI_TX_BUFFER_SIZE & TWI_TX_BUFFER_MASK )
-#  error TWI TX buffer size is not a power of 2
-#endif
-
-
-
-#endif  // ifndef _USI_TWI_SLAVE_H_
diff --git a/digital-driver/firmware/firmware.ino b/digital-driver/firmware/firmware.ino
deleted file mode 100644
index c024bbf..0000000
--- a/digital-driver/firmware/firmware.ino
+++ /dev/null
@@ -1,58 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////////
-//       Digital Photoreactor Controller Slave Program Controlled by I2C          //
-//                    Run this slave program on the AtTiny85.                     //      
-////////////////////////////////////////////////////////////////////////////////////
-
-#include "TinyWireS.h"                  // wrapper class for I2C slave routines   https://github.com/rambo/TinyWire/tree/master
-
-#define I2C_SLAVE_ADDR  0x26            // I2C slave address (38, 0x26), 
-
-uint8_t master_data[1];               // global buffer to store data sent from the master.
-uint8_t master_bytes;                  // global variable to number of bytes sent from the master.
-
-const int LEDPin = 4;                  //Arduino pin 4, pin 3 on AtTiny85 pinout
-const int FanPin = 1;                  //Arduino pin 1, pin 6 on AtTiny85 pinout
-const int BlinkPin = 3;                //Arduino pin 3, pin 2 on AtTiny85 pinout
-
-void setup()
-{
-  // initialize the TinyWireS and usiTwiSlave libraries
-  TinyWireS.begin(I2C_SLAVE_ADDR);      // init I2C Slave mode
-
-  // register the onReceive() callback function
-  TinyWireS.onReceive(receiveEvent);
-  
-  pinMode(LEDPin, OUTPUT);   // set pin for LED PWM
-  pinMode(FanPin, OUTPUT);   // set pin for Fan PWM
-  pinMode(BlinkPin, OUTPUT); // set pin to blink LED
-  
-  TCCR0B = TCCR0B & 0b11111000 | 0b001; // sets internal timer of AtTiny85 to 31250 Hz for fast PWM for controlling fan speed
-}
-
-// Gets called when the ATtiny85 receives an I2C write slave request
-void receiveEvent(uint8_t num_bytes)
-{
-  uint8_t i;
-  
-  // save the number of bytes sent from the master
-  master_bytes = num_bytes;
-
-  // store the data from the master into the data buffer
-  for (i = 0; i < master_bytes; i++)
-    master_data[i] = TinyWireS.receive();
-
-  // set LED and Fan PWM duty to random byte values recieved from the master
-  analogWrite(FanPin, master_data[0]);
-  analogWrite(LEDPin, master_data[1]);
-
-  // blink LED whenever data is successfuly recieved
-  digitalWrite(BlinkPin, HIGH);
-  delay(10);
-  digitalWrite(BlinkPin, LOW);
-
-}
-
-void loop()
-{
-  
-}
author	Philip Lampkin <plampkin@chem.wisc.edu>	2021-04-24 12:07:04 -0500
committer	Philip Lampkin <plampkin@chem.wisc.edu>	2021-04-24 12:07:04 -0500
commit	40ab1463c3da0c844eedba5c5f52d5ef8af322c4 (patch)
tree	d7984802dbe72f0d203d7b86372ca355ac0c833d /digital-driver/firmware
parent	d6df6a65cf04da7ed29e8f09c0bf14c8b2cfb2e6 (diff)