Function rt_serial_tx_disable

components/drivers/serial/dev_serial_v2.c:1079–1119

* @brief Disable serial tranmit mode. * @param dev The pointer of device driver structure * @param rx_oflag The flag of that the serial port opens. * @return Return the status of the operation. */

  * @return Return the status of the operation.
  */
static rt_err_t rt_serial_tx_disable(struct rt_device *dev,
                                     rt_uint16_t       tx_oflag)
{
    struct rt_serial_device  *serial;
    struct rt_serial_tx_fifo *tx_fifo;

    RT_ASSERT(dev != RT_NULL);
    serial = (struct rt_serial_device *)dev;

#ifndef RT_USING_DEVICE_OPS
    dev->write = RT_NULL;
#endif

    if (serial->serial_tx == RT_NULL) return RT_EOK;

    tx_fifo = (struct rt_serial_tx_fifo *)serial->serial_tx;
    RT_ASSERT(tx_fifo != RT_NULL);

    if (tx_oflag == RT_SERIAL_TX_NON_BLOCKING)
    {
        dev->open_flag &= ~RT_SERIAL_TX_NON_BLOCKING;
        /* disable ignore return value */
        serial->ops->control(serial,
                             RT_DEVICE_CTRL_CLR_INT,
                             (void *)RT_SERIAL_TX_NON_BLOCKING);
    }
    else
    {
        rt_completion_done(&tx_fifo->tx_cpt);
        dev->open_flag &= ~RT_SERIAL_TX_BLOCKING;
        /* disable ignore return value */
        serial->ops->control(serial,
                             RT_DEVICE_CTRL_CLR_INT,
                             (void *)RT_SERIAL_TX_BLOCKING);
    }


    rt_free(tx_fifo);
    serial->serial_tx = RT_NULL;
    return RT_EOK;
}

/**
  * @brief Initialize the serial device.