[Voyage-linux] ALIX.2D2 and I2C EEPROM

[Markus Cords]

Hello,

I have a ALIX 2D2 Board with Voyage 0.8.
My Problem is to access the I2C EEPROM (externel) with my programm.

root at voyage:/tmp# i2cdetect -y 0
      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- UU -- -- --
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root at voyage:/tmp#


The Address of the eeprom is 0x50


with my programm:
root at voyage:/tmp# ./main
Failed to write to the i2c bus.


[code]

#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

void main(void) {
   int file;
   char *filename = "/dev/i2c-0";
   if((file = open(filename, O_RDWR)) < 0)
   {
     perror("Failed to open the i2c bus");
     exit(1);
   }

   int addr = 0x50;
   if (ioctl(file, I2C_SLAVE, addr) < 0) {
     printf("Failed to acquire bus access and/or talk to slave.\n");
     exit(1);
   }
   char buf[10] = {0};

   buf[0] = 0x00;
   buf[1] = 0xAA;
   if(write(file, buf, 2) != 1)
   {
     printf("Failed to write to the i2c bus.\n");
     printf("\n\n");
   }
}
[/code]

I hope anybody can help me.

Thanks,
Markus