Re: I2C programming

[Rafael Rodr�guez Velilla]

I've attached the code that I fail to compile.

--
Rafael Rodr�guez Velilla        [EMAIL PROTECTED]
Telef�nica I+D          http://www.tid.es
Telf: +34 - 91 337 4270
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
int main(void)
{
  int file;
  int addr = 0x54; // The I2C address 
  __u8 registro = 0; // Device register to access 
  __s32 res;
  char buf[10];
  int adapter_nr = 0; /* probably dynamically determined */
  char filename[20];

  sprintf(filename,"/dev/i2c-%d",adapter_nr);
  if ((file = open(filename,O_RDWR)) < 0) {
    /* ERROR HANDLING; you can check errno to see what went wrong */
    printf("Error al abrir el dispositivo\n");
    exit(1);
  }

  if (ioctl(file,I2C_SLAVE,addr) < 0) {
    /* ERROR HANDLING; you can check errno to see what went wrong */
    printf("Error al n");
    exit(1);
  }
  for (registro=0;registro<=0x18;registro++) {
    res = i2c_smbus_read_byte_data(file,registro);
    if (res < 0) {
      /* ERROR HANDLING: i2c transaction failed */
      printf("Falla al leer el registro %d\n",registro);
    } else {
      printf("Registro %d = %d\n",registro,res);
      /* res contains the read word */
    }
  }
  close (file);
}