Question

在我的主板上，我有一个设置寄存器的I2C设备。

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。但对于Linux Os中的I2C通信，请参阅此链接Interfacing_with_I2C_Devices

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

如果您无法修改sprintf，即

，请使用UMAP_DEVNAME_I2C

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*/

内核驱动程序i2c Develop

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