Function rt_usart_init

bsp/efm32/drv_usart.c:125–158

Private function prototypes -----------------------------------------------*/ Private functions ---------------------------------------------------------*/ / * @brief * Initialize USART device * * @details * * @note * * @param[in] dev * Pointer to device descriptor * * @return * Error code ******************************************************************************/

 *   Error code
 ******************************************************************************/
static rt_err_t rt_usart_init (rt_device_t dev)
{
    struct efm32_usart_device_t *usart;

    usart = (struct efm32_usart_device_t *)(dev->user_data);

    if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
    {
        if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
        {
            struct efm32_usart_dma_mode_t *dma_tx;

            dma_tx = (struct efm32_usart_dma_mode_t *)(usart->tx_mode);

            usart->state |= USART_STATE_RX_BUSY;
        }

        if (dev->flag & RT_DEVICE_FLAG_INT_RX)
        {
            struct efm32_usart_int_mode_t *int_rx;

            int_rx = (struct efm32_usart_int_mode_t *)(usart->rx_mode);

            int_rx->data_ptr = RT_NULL;
        }

        /* Enable USART */
        USART_Enable(usart->usart_device, usartEnable);

        dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
    }

    return RT_EOK;
}

/***************************************************************************//**
 * @brief