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/*
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
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