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68 lines
2.9 KiB
C++
68 lines
2.9 KiB
C++
/*
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TinyWireM.h - a wrapper(+) class for TWI/I2C Master library for the ATtiny on Arduino
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1/21/2011 BroHogan - brohoganx10 at gmail dot com
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Thanks to 'jkl' for the gcc version of Atmel's USI_TWI_Master code
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http://www.cs.cmu.edu/~dst/ARTSI/Create/PC%20Comm/
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I added Atmel's original Device dependant defines section back into USI_TWI_Master.h
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NOTE! - It's very important to use pullups on the SDA & SCL lines! More so than with the Wire lib.
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USAGE is modeled after the standard Wire library . . .
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Put in setup():
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TinyWireM.begin(){ // initialize I2C lib
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To Send:
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TinyWireM.beginTransmission(uint8_t slaveAddr){ // setup slave's address (7 bit address - same as Wire)
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TinyWireM.send(uint8_t data){ // buffer up bytes to send - can be called multiple times
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someByte = TinyWireM.endTransmission(){ // actually send the bytes in the buffer
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// returns (optional) 0 = sucess or see USI_TWI_Master.h for error codes
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To Receive:
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someByte = TinyWireM.requestFrom(uint8_t slaveAddr, uint8_t numBytes){ // reads 'numBytes' from slave's address
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// (usage optional) returns 0= success or see USI_TWI_Master.h for error codes
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someByte = TinyWireM.receive(){ // returns the next byte in the received buffer - called multiple times
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someByte = TinyWireM.available(){ // returns the number of unread bytes in the received buffer
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TODO: (by others!)
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- merge this class with TinyWireS for master & slave support in one library
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This library is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2.1 of the License, or any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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*/
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#ifndef TinyWireM_h
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#define TinyWireM_h
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#include <inttypes.h>
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#define USI_SEND 0 // indicates sending to TWI
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#define USI_RCVE 1 // indicates receiving from TWI
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#define USI_BUF_SIZE 16 // bytes in message buffer
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class USI_TWI
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{
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private:
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static uint8_t USI_Buf[]; // holds I2C send and receive data
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static uint8_t USI_BufIdx; // current number of bytes in the send buff
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static uint8_t USI_LastRead; // number of bytes read so far
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static uint8_t USI_BytesAvail; // number of bytes requested but not read
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public:
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USI_TWI();
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void begin();
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void beginTransmission(uint8_t);
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void send(uint8_t);
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uint8_t endTransmission();
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uint8_t requestFrom(uint8_t, uint8_t);
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uint8_t receive();
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uint8_t available();
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};
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extern USI_TWI TinyWireM;
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#endif
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