TinyWireM.h File Reference

#include "Arduino.h"
#include <inttypes.h>

Go to the source code of this file.

Classes
class	USI_TWI
	class USI_TWI : public Stream More...

Macros
#define	USI_SEND   0
	indicates sending to TWI
#define	USI_RCVE   1
	indicates receiving from TWI
#define	USI_BUF_SIZE   18
	bytes in message buffer

Variables
USI_TWI	TinyWireM
	Makes TinyWireM an object of USI_TWI.

Detailed Description

TinyWireM.h - a wrapper(+) class for TWI/I2C Master library for the ATtiny on Arduino 1/21/2011 BroHogan - brohoganx10 at gmail dot com

Thanks to 'jkl' for the gcc version of Atmel's USI_TWI_Master code http://www.cs.cmu.edu/~dst/ARTSI/Create/PC%20Comm/ I added Atmel's original Device dependant defines section back into USI_TWI_Master.h

NOTE! - It's very important to use pullups on the SDA & SCL lines! More so than with the Wire lib.

USAGE is modeled after the standard Wire library . . . Put in setup(): TinyWireM.begin(){ // initialize I2C lib To Send: TinyWireM.beginTransmission(uint8_t slaveAddr){ // setup slave's address (7 bit address - same as Wire) TinyWireM.send(uint8_t data){ // buffer up bytes to send - can be called multiple times someByte = TinyWireM.endTransmission(){ // actually send the bytes in the buffer // returns (optional) 0 = sucess or see USI_TWI_Master.h for error codes To Receive: someByte = TinyWireM.requestFrom(uint8_t slaveAddr, uint8_t numBytes){ // reads 'numBytes' from slave's address // (usage optional) returns 0= success or see USI_TWI_Master.h for error codes someByte = TinyWireM.receive(){ // returns the next byte in the received buffer - called multiple times someByte = TinyWireM.available(){ // returns the number of unread bytes in the received buffer

TODO:   (by others!)
- merge this class with TinyWireS 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.