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1. 
   #include <stdio.h>
   
   
   


2. 
   #include <fcntl.h>
   
   


3. 
   #include <linux/i2c-dev.h>
   
   


4. 
   #include <errno.h>
   
   


5. 
   #define I2C_ADDR        0x5c
   
   


6. 
   int main(void)
   
   


7. 
   {
   
   


8. 
           int fd;
   
   


9. 
           char buf[3];
   
   


10. 
            char val,value;
    
    


11. 
            float flight;
    
    


12. 
            fd=open("/dev/i2c-1",O_RDWR);
    
    


13. 
            if(fd<0)
    
    


14. 
            {
    
    


15. 
                    printf("err open file:%s\r\n",strerror(errno)); return 1;
    
    


16. 
            }
    
    


17. 
            if(ioctl( fd,I2C_SLAVE,I2C_ADDR)<0 )
    
    


18. 
            {
    
    


19. 
                    printf("ioctl error : %s\r\n",strerror(errno));return 1;
    
    


20. 
            }
    
    


21. 
            val=0x01;
    
    


22. 
            if(write(fd,&val,1)<0)
    
    


23. 
            {
    
    


24. 
                    printf("write 0x01 err\r\n");
    
    


25. 
            }
    
    


26. 
            val=0x10;
    
    


27. 
            if(write(fd,&val,1)<0)
    
    


28. 
            {
    
    


29. 
                    printf("write 0x10 err\r\n");
    
    


30. 
            }
    
    


31. 
            while(1)
    
    


32. 
    
    
    


33. 
            {
    
    


34. 
                    if(read(fd,&buf,3))
    
    


35. 
                    {
    
    


36. 
                            flight=(buf[0]*256+buf[1])/1.2;
    
    


37. 
                            printf("light is %6.3f\r\n",flight);
    
    


38. 
                    }
    
    


39. 
                    else
    
    


40. 
                    {
    
    


41. 
                            printf("read light error\r\n");
    
    


42. 
                    }
    
    


43. 
                    usleep(100000);//sleep 0.1s
    
    


44. 
            }
    
    


45. 
    }