i2cmaster.h

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/*  BSD-License:

Copyright (c) 2007 by Nils Springob, nicai-systems, Germany

All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
  * Neither the name nicai-systems nor the names of its contributors may be
    used to endorse or promote products derived from this software without
    specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#ifndef NIBOBURGER_I2CMASTER_H_
#define NIBOBURGER_I2CMASTER_H_

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define I2C_BUF_SIZE 0x25
#define NIBO_I2C_TXRX 1
#define I2C_TWBR_INIT 100


#ifdef NIBO_I2C_TXRX

extern volatile uint8_t i2c_tx_size;

extern volatile uint8_t i2c_rx_size;

#else

extern volatile uint8_t i2c_size;

#endif


extern uint8_t i2c_buf[I2C_BUF_SIZE];

enum {
  I2C_BUSY,
  I2C_IDLE,
  I2C_SUCCESS,
  I2C_ERROR=0x10
};

void i2c_init(void);

uint8_t i2c_start_transmission(void);

uint8_t i2c_status(void);

extern volatile uint8_t i2c_last_TWSR;
extern volatile uint8_t i2c_pos;

uint8_t i2c_wait_transmission(void);

#define I2C_TX(ADDR) ((ADDR)<<1)
#define I2C_RX(ADDR) (((ADDR)<<1)+1)

#ifdef __cplusplus
} // extern "C"
#endif

#endif // NIBOBURGER_I2CMASTER_H_