内核驱动 i2c 开发

Question

在我的板上，我有一个 I2C 设备，可以设置一些寄存器。

g_I2cDevFd = open("/dev/" UMAP_DEVNAME_I2C, O_RDWR, 0);
if (g_I2cDevFd < 0)
{
    HI_FATAL_I2C("open I2C err.\n");
    HI_I2C_UNLOCK();
    return HI_ERR_I2C_OPEN_ERR;
}

我该怎么做？

最好的问候

Answer 1

你的问题不是很清楚。但是对于Linux Os中的I2C通信，请参考这个链接Interfacing_with_I2C_Devices

• 请在定义UMAP_DEVNAME_I2C 时使用您的设备路径。即#define UMAP_DEVNAME_I2C "/dev/your_i2c_device"

• 如果您无法编辑UMAP_DEVNAME_I2C，则使用sprintf，即，

  char buff[100] = {0}; // size you can change according to your requirement
  
  sprintf(buff,"/dev/%s",UMAP_DEVNAME_I2C);
  g_I2cDevFd = open(buff, O_RDWR, 0);
  /* Error check for open here*/
  
  int addr = 0xFF;          // 0xFF is Invalid, Give I2C address of your device
  if (ioctl(g_I2cDevFd, I2C_SLAVE, addr) < 0) {
      printf("Failed to acquire bus access and/or talk to slave.\n");
      /* ERROR HANDLING; you can check errno to see what went wrong */
      exit(1);
  }
  
  /* Write or Read*/