#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/i2c-dev.h>
#define I2C_SLAVE 0x0703 /* Change slave address */

int i2c;
int rc;
unsigned int address;
unsigned char data[3];
unsigned char result[2];

int main(int argc, char ** argv)
{
  if(argc != 4) 
  { 
    fprintf(stderr, "usage: %s [I2Cdevice_address] [command] [data16bits]",argv[0]);
    exit(1);
  }

  /* address is the first number after the program name */
  address = atoi(argv[1]);    // i2c slave address
  data[0] = atoi(argv[2]);    // pic command
  data[1] = atoi(argv[3]);    // pic data lsb
  data[2] = atoi(argv[3])>>8; // pic data msb

  i2c = open("/dev/i2c-0",O_RDWR); /* open the device dev/i2c-0 */
  rc=ioctl(i2c,I2C_SLAVE,address); /* set the i2c chip address */

// write data to pic
  write(i2c,data,3);
  //usleep(50); 
  printf("I2Cdev[%d] -> Command=%d, Data_LSB=%d, Data_MSB=%d\n", address, data[0], data[1], data[2]);


  i2c = close(i2c);

return(0);
}