Linux应用层I2C操作

Linux应用层I2C操作:

背景：
项目需求，需检测是否有camera sensor(CHIP_ADDR:0x6C>>1),
通过I2C读取sensor的CHIP ID(CHIP_ID_H:0x300A, CHIP_ID_L:0x300B)为0x27 0x70

应用层I2C操作:

C
     unsigned char rddata[2]={0};
     unsigned char rdaddr0[2] = {0x30, 0x0A}; //CHIP_ID_H  0x27
     unsigned char rdaddr1[2] = {0x30, 0x0B}; //CHIP_ID_L  0x70
     int fd =open(CHIP, O_RDWR);
     if (fd< 0) {
         printf("open"CHIP"failed\n");        
         return -1;
     }
 #if 0  //方式一
     if (ioctl(fd, I2C_SLAVE_FORCE, CHIP_ADDR) < 0) { 
         /* 设置芯片地址 */
         printf("oictl:setslave address failed\n");

..............

作者: Shell