I2C kompatibel unter AVRs?

#include <avr/io.h>

#include "i2c.h"

//Initialisierung

void i2c_init(void)

{

  TWBR = 8;

  TWCR = 0x84;

  TWSR = 0x00;

}

//I2C Starten, Adresse angeben

void i2c_start(uint8_t address, uint8_t read)  //schreiben 0 lesen 1

{

  // TWI START

  TWCR = 0xA4;

  // TWI SEND: address first brick

  while(!(TWCR & 0x80));

  TWDR = address | read;

  TWCR = 0x84;

}

//I2C stopen

void i2c_stop(void)

{

  // TWI STOP

  while(!(TWCR & 0x80));

  TWCR = 0x94;

}

//I2C schreiben, Daten angeben

void i2c_write(uint8_t data)

{

  // TWI SEND: data

  while(!(TWCR & 0x80));

  TWDR = data;

  TWCR = 0x84;

}

//I2C lesen, Register angeben und ACK oder NACK

uint8_t i2c_read(uint8_t sendACK)

{

  // TWI READ: send zero

  while(!(TWCR & 0x80));

  TWDR = 0xFF;

  TWCR = 0x84 | (sendACK ? 0x40 : 0x00);

  while(!(TWCR & 0x80));

  return TWDR;

}