Function rt_leuart_control

bsp/efm32/drv_leuart.c:508–601

/ * @brief * Configure LEUART device * * @details * * @note * * @param[in] dev * Pointer to device descriptor * * @param[in] cmd * IIC control command * * @param[in] args * Arguments * * @return * Error code ******************************************************************************/

*   Error code
******************************************************************************/
static rt_err_t rt_leuart_control (
    rt_device_t     dev,
    rt_uint8_t      cmd,
    void            *args)
{
    RT_ASSERT(dev != RT_NULL);

    rt_err_t    err_code;
    struct efm32_leuart_device_t *leuart;

    leuart = (struct efm32_leuart_device_t *)(dev->user_data);

    /* Lock device */
    if (rt_hw_interrupt_check())
    {
        err_code = rt_sem_take(leuart->lock, RT_WAITING_NO);
    }
    else
    {
        err_code = rt_sem_take(leuart->lock, RT_WAITING_FOREVER);
    }
    if (err_code != RT_EOK)
    {
        return err_code;
    }

    switch (cmd)
    {
    case RT_DEVICE_CTRL_SUSPEND:
        /* Suspend device */
        dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
        LEUART_Enable(leuart->leuart_device, leuartDisable);
        break;

    case RT_DEVICE_CTRL_RESUME:
        /* Resume device */
        dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
        LEUART_Enable(leuart->leuart_device, leuartEnable);
        break;

    case RT_DEVICE_CTRL_LEUART_RBUFFER:
        /* Set RX buffer */
        {
            struct efm32_leuart_int_mode_t *int_rx;
            rt_uint8_t size;

            int_rx = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);
            size = (rt_uint8_t)((rt_uint32_t)args & 0xFFUL);

            /* Free previous RX buffer */
            if (int_rx->data_ptr != RT_NULL)
            {
                if (size == 0)
                {   /* Free RX buffer */
                    rt_free(int_rx->data_ptr);
                    int_rx->data_ptr = RT_NULL;
                }
                else if (size != int_rx->data_size)