[Gumstix-users] I2C Problem For a Newbie..

[silex <mer...@gm...>]

Hello,

I have Gumstix Overo, with 2.6.35 kernel on it.. I need to achieve
communication with Sparkfun IMU3000 Accelerometer&Gyro. I had spent so much
hours on it, but i could not succeed on using "ioctl" function, i need your
help.
I can open i2c-3 port without any problem. But, after running (ioctl(fh,
I2C_SLAVE,GYRO_W) function ,as i used at the below, i get this error:
"ioctl: Invalid Argument"
I have realized that, if i write 7 bits of data to  the address of slave
device, i dont get any errors. But all of my r/w slave address bits are 8
bit, so how can i use ioctl without problem??  

Here is the code;

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

//addresses of imu
#define GYRO_W 0xD0 
#define GYRO_R 0XD1
#define ACC_W 0xA6
#define ACC_R 0xA7  

int main(void)
{

int fh;
char buff[16]; 

fh=open("/dev/i2c-3",O_RDWR);

if (fh < 0) {
              perror("open");
              return 1;
     } 

 if (ioctl(fh, I2C_SLAVE,GYRO_W) < 0) {
              perror("ioctl");
              return 1;
      }

//rest of code.. not important for now..
return 0;
}

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