接口设计

struct rt_i2c_bus_device_ops
{
    rt_size_t (*master_xfer)(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num);
    rt_size_t (*slave_xfer)(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num);
    rt_err_t (*i2c_bus_control)(struct rt_i2c_bus_device *bus, rt_uint32_t, rt_uint32_t);
};

D211 实例化的结构体为：

static const struct rt_i2c_bus_device_ops i2c_ops = {
    aic_i2c_master_xfer,    // master_xfer
    RT_NULL,                // slave_xfer
    aic_i2c_bus_control,    // bus_control
};

I2C 消息结构体

struct rt_i2c_msg
{
    rt_uint16_t addr;       // I2C 从设备地址
    rt_uint16_t flags;      // I2C 读写标志
    rt_uint16_t len;        // 待传输数据的长度
    rt_uint8_t  *buf;       // 待传输数据的指针
};