arm - Atmel / Microchip studio I2C 通信 ASF 框架工作

Question

我是 atmel / microchip studio 的新手，并试图通过 I2C 与从机通信。I2C 传输命令的 HAL 库或 ASF 框架如下。

int32_t i2c_m_sync_cmd_write(struct i2c_m_sync_desc *i2c, uint8_t reg, uint8_t *buffer, uint8_t length)
{
    struct _i2c_m_msg msg;
    int32_t           ret;

    msg.addr   = i2c->slave_addr;
    msg.len    = 1;
    msg.flags  = 0;
    msg.buffer = ®

    ret = _i2c_m_sync_transfer(&i2c->device, &msg);

    if (ret != 0) {
        /* error occurred */
        return ret;
    }

    ****msg.flags  = I2C_M_STOP;
    msg.buffer = buffer;
    msg.len    = length;

    ret = _i2c_m_sync_transfer(&i2c->device, &msg);

    if (ret != 0) {
        /* error occurred */
        return ret;
    }****

    return ERR_NONE;
}

问题是四颗星（****）之间的代码传输了一个不需要的帧，因此，从站行为异常。所需帧在代码星号部分上方的代码部分中正确传输。如果注释星号部分，则代码无法正常工作。有什么解决办法吗？