TWI Kommunikation gesucht in C

/*******************************************************

 Author:          Manfred Langemann

 mailto:          Manfred.Langemann ät t-online.de

 Begin of project:      04.01.2008

 Latest version generated:  04.01.2008

 Filename:          Main.c

 Description:          Main routine for testing

               TWI_Master_main.c

 ********************************************************/

#include <stdio.h>

#include <avr/interrupt.h>

#include "General.h"

#include "RS232.h"

#include "Delay.h"

#include "TWI_Master.h"

/*

** This main programm demonstrates how to use the 

** implemented TWI master functions. These are:

**  TWIM_Init

**  TWIM_ReadAck

**  TWIM_ReadNack

**  TWIM_Write

**  TWIM_Stop

**

** For testing this program, use the program

** TWI_Slave_main.c in the slave uC and connect the

** two TWI lines properly (don't forget to also

** connect GND between Master and Slave!)

**

** Used uC for Master is ATMega32

*/

int main (void)

  {

  uint8_t    i;

  uint8_t    j=0;

  uint8_t    Data[8];

  uint8_t    SlaveAddress = 15;

/*

** Clear any interrupt

*/

  cli ();

/*

** Wait 1 second for POR

*/

  Delay_ms (1000);

/*

** Initiate RS232

*/

  RS232_Init ();

  printf ("Hello world...\n");

/*

** Initiate TWI Master Interface with bitrate of 100000 Hz

*/

  if (!TWIM_Init (100000))

    {

    printf ("Error in initiating TWI interface\n");

    while (1);

    }

/*

** Endless loop

*/

  while (1)

    {

/*

** Read byte(s) from the slave.

** It is implicitely assumed, that the slave will send

** 8 bytes

*/

      if (!TWIM_Start (SlaveAddress, TWIM_READ))

      {

      TWIM_Stop ();

      printf ("Could not start TWI Bus for READ\n");

        }

    else

      {

      for (i=0;i<7;i++)

        {

            Data[i] = TWIM_ReadAck ();

        printf ("Reading Byte %d: %d\n", i, Data[i]);

        }

          Data[7] = TWIM_ReadNack ();

      printf ("Reading Byte %d: %d\n", i, Data[7]);

      TWIM_Stop ();

      Delay_ms (1000);

      }

/*

** Write byte(s) to the slave.

** It is implicitely assumed, that the slave will

** accepts 8 bytes

*/

      if (!TWIM_Start (SlaveAddress, TWIM_WRITE))

      {

      TWIM_Stop ();

      printf ("Could not start TWI Bus for WRITE\n");

        }

    else

      {

      for (i=0;i<8;i++)

        {

            TWIM_Write (j++);

        printf ("Byte %d sent: %d\n", i, j);

        }

      TWIM_Stop ();

      Delay_ms (1000);

      }

/*

** Do something else

*/

    i++;

    }

  return 0;

  }