linux下i2c读写数据代码实现

以下是在Linux下使用i2c读写数据的代码实现示例：

1. 打开i2c设备

int file;
char *filename = "/dev/i2c-1"; // i2c设备文件名
int addr = 0x68; // i2c设备地址

if ((file = open(filename, O_RDWR)) < 0) {
    printf("Failed to open the i2c bus\n");
    exit(1);
}

if (ioctl(file, I2C_SLAVE, addr) < 0) {
    printf("Failed to acquire bus access and/or talk to slave.\n");
    exit(1);
}

2. 写入数据

unsigned char buf[2];
buf[0] = 0x00; // 寄存器地址
buf[1] = 0x01; // 数据

if (write(file, buf, 2) != 2) {
    printf("Failed to write to the i2c bus.\n");
    exit(1);
}

3. 读取数据

unsigned char buf[1];
buf[0] = 0x00; // 寄存器地址

if (write(file, buf, 1) != 1) {
    printf("Failed to write to the i2c bus.\n");
    exit(1);
}

if (read(file, buf, 1) != 1) {
    printf("Failed to read from the i2c bus.\n");
    exit(1);
}

printf("Data read: 0x%x\n", buf[0]);

4. 关闭i2c设备

close(file);

请注意，上述示例代码仅供参考，实际使用时需要根据具体情况进行相应的修改和适配。