TWI lesen? MD25

/*

 * MD25_24_02_15.c

 *

 * Created: 24.02.2015 13:57:49

 *  Author: andreas

 */ 

#include <avr/io.h>

#define TAKT 1000000UL

#define EINAD 0xB0        //Write

#define AUSAD 0xB1        //Read 

#define FAKTOR 10        //möglicherweise ändern

#define TEILER 1        //-||-

#define MOTOR1 0x00

#define MOTOR2 0x01

#define MOTOR1_STROM 0x0B

#define MOTOR2_STROM 0x0C

//////////////////////////////////////

//                  //

//    Funktionen Definieren      //

//                  //

//////////////////////////////////////

//TWI INITALISIEREN

void init(unsigned char faktor, unsigned char teiler)

{

  TWBR = faktor;          //Bitrate

  TWSR = teiler;          //Prescaler

}

//TWI INITALISIEREN END

//TWI SENDEN

void send(unsigned char adres,unsigned char reg, unsigned char daten)

{

  TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);        //Startbedingung

  loop_until_bit_is_set(TWCR, TWINT);            //warte bis fertig

  TWDR = adres;

  TWCR = (1<<TWINT) | (1<<TWEN);

  loop_until_bit_is_set(TWCR, TWINT);

  TWDR = reg;

  TWCR = (1<<TWINT)|(1<<TWEN);

  loop_until_bit_is_set(TWCR, TWINT);

  TWDR = daten;

  TWCR = (1<<TWINT)|(1<<TWEN);

  loop_until_bit_is_set(TWCR, TWINT);

  TWCR = (1<<TWINT)|(1<<TWSTO)|(1<<TWEN);

}

//TWI SENDEN END

//TWI EMPFANGEN

unsigned char empf(unsigned char adres, unsigned char reg)

{

  unsigned char daten;

  TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);

  loop_until_bit_is_set(TWCR, TWINT);

  TWDR = adres;

  TWCR = (1<<TWINT)|(1<<TWEN);

  loop_until_bit_is_set(TWCR,TWINT);

  TWDR = reg;

  TWCR = (1<<TWINT)|(1<<TWEN);

  loop_until_bit_is_set(TWCR,TWINT);

  TWCR=(1<<TWINT)|(1<<TWEN);

  loop_until_bit_is_set(TWCR,TWINT);

  daten = TWDR;

  TWCR = (1<<TWINT)|(1<<TWEA)|(1<<TWEN);

  loop_until_bit_is_set(TWCR,TWINT);

  TWCR = (1<<TWINT)|(1<<TWSTO)|(1<<TWEN);

  return daten;

}

//TWI EMPFANGEN END

int main(void)

{

  unsigned char ausl; 

  init(FAKTOR,TEILER);

    while(1)

    {

    send(EINAD,MOTOR1,0x80);

    send(EINAD,MOTOR2,0x80);

    ausl = empf(AUSAD, MOTOR1);

    PORTB = ausl;

    }

}