Работа с МК i.MX28 по I2C (ЭКЛЗ)

#include <linux/i2c-dev.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdint.h>
 
#define ADAPTER 0
#define ADDR_SLAVE 0x68
#define SIZE_READ 8
 
int main(void)
{
    int i2c_file;
    int i;
    char i2c_filename[20];
    int i2c_adapter_nr = ADAPTER;
    int i2c_addr = ADDR_SLAVE;
    char write_buf[1];
    char read_buf[SIZE_READ];
    uint8_t val;
 
    //printf("Step 1: Opening file defice I2C\n");
    snprintf(i2c_filename, 19, "/dev/i2c-%d", i2c_adapter_nr);
 
// Доступ к I2C шине, как открытие файла
    if ((i2c_file = open(i2c_filename, O_RDWR)) < 0)
    {
        printf("Error Read PRS: Failed opening file device I2C\n");
        return 0; 
    }
    
    //printf("\nStep 2: Acquiring I2C access and/or talk to Detector PRS\n");
// Обращение к Slave по адресу
    if (ioctl(i2c_file, I2C_SLAVE_FORCE, i2c_addr) < 0)
    {
        printf("Error Read PRS: Failed to acquire I2C access and/or talk to Detector PRS\n");
        close(i2c_file);
        return 0;
    }   
 
    //printf("Step 5: Read data\n");
    if (read(i2c_file,read_buf,8) != 8)
    {
        printf("Error Read PRS: Failed read %d bit\n", read_buf[0]); 
            close(i2c_file);
            return 0;
    }
 
    //printf("Step 6: Out console result\n");
    // вывод времени и  даты
    printf("%x %x %x %x %x %x %x %x\n",read_buf[0],read_buf[1],read_buf[2],read_buf[3],read_buf[4],read_buf[5],read_buf[6],read_buf[7]);
    
 
    close(i2c_file);
    return 0;
 
}