From bf5893688496e2ae85808303e425c439f06c7efc Mon Sep 17 00:00:00 2001
From: Blaise Thompson <blaise@untzag.com>
Date: Sat, 24 Apr 2021 17:21:37 -0500
Subject: updated controller firmware with serial interface

---
 .../arduino-uno-controller/firmware/firmware.ino   | 86 +++++++++++++++-------
 1 file changed, 59 insertions(+), 27 deletions(-)

(limited to 'digital-controller/arduino-uno-controller/firmware')

diff --git a/digital-controller/arduino-uno-controller/firmware/firmware.ino b/digital-controller/arduino-uno-controller/firmware/firmware.ino
index e87db8d..3735c4a 100644
--- a/digital-controller/arduino-uno-controller/firmware/firmware.ino
+++ b/digital-controller/arduino-uno-controller/firmware/firmware.ino
@@ -1,41 +1,73 @@
 #include <Wire.h>
 
-#define I2C_SLAVE_ADDR  0x26            // I2C slave address (38, 0x26)
+#define INPUT_SIZE 100  // TODO: make this a reasonable value
+#define sep " "
+char input[INPUT_SIZE + 1];
 
-void setup()
-{
+char c_address = '0';
+char c_led = '0';
+char c_fan = '0';
+int address = 0;
+int led = 0;
+int fan = 0;
+
+void setup() {
   pinMode(A4, OUTPUT);
   pinMode(A5, OUTPUT);
-  // init the Wire object
   Wire.begin(); 
-  
-  // wait for slave to finish any init sequence
-  delay(2000);
-
   Serial.begin(9600);
 }
 
-void loop()
-{
-  for( int a=10; a<=255; a++ ){
-  //generate buffer containing data to send via I2C
-  uint8_t buf[1];
-  buf[0] = 255-a;  // adjusting this byte changes fan speed. Can be adjusted from 0 to 256.
-  buf[1] = a;  // adjusting this byte changes LED intensity. Can be adjusted from 0 to 256. 
-  Serial.println(int(buf));
+void loop() {
+}
 
-  // send buffer 
-  Wire.beginTransmission(I2C_SLAVE_ADDR);
-  Wire.write(buf, 2);
-  Wire.endTransmission();
-  
-  // delay 20 milliseconds to accomodate slave onReceive()
-  delay(20);
+void scan() {
+  Serial.println("scanning!");
+  byte error, address;
+
+  for(address = 1; address < 127; address++ ) 
+  {
+    // The i2c_scanner uses the return value of
+    // the Write.endTransmisstion to see if
+    // a device did acknowledge to the address.
+    Wire.beginTransmission(address);
+    error = Wire.endTransmission();
 
-  /////////////////////// WHY DO I NEED THIS PART?//////////////////////////
-  Wire.requestFrom(I2C_SLAVE_ADDR, 1);
+    if (error == 0)
+    {
+      Serial.print("I2C device found at address ");
+      Serial.println(address);
+    } 
+  }
   
-  // delay 1 second so user can watch results
-  delay(50);
+}
+
+void serialEvent() {  // occurs whenever new data comes in the hardware serial RX
+  // read serial into input char array
+  byte size = Serial.readBytesUntil('\n', input, INPUT_SIZE);
+  input[size] = 0;
+  // parse input
+  char *c_address = strtok(input, sep);
+  char *c_led = strtok(0, sep);
+  char *c_fan = strtok(0, sep);
+  // convert input
+  address = atoi(c_address);
+  led = atoi(c_led);
+  fan = atoi(c_fan);
+  // scan if address is less than zero
+  if (address < 0) {
+    scan();
   }
+  // write to peripheral
+  uint8_t buf[1];
+  buf[0] = fan;
+  buf[1] = led;
+  Wire.beginTransmission(address);
+  Wire.write(buf, 2);
+  Wire.endTransmission();
+}
+
+void serialEventRun(void) {
+  // this runs inside of the main loop, essentially
+  if (Serial.available()) serialEvent();
 }
-- 
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