Update drv_usart.c
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@ -634,11 +634,13 @@ void LPUART1_DMA_RX_IRQHandler(void)
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#ifdef RT_SERIAL_USING_DMA
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static void stm32_dma_config(struct rt_serial_device *serial, rt_ubase_t flag)
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{
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RT_ASSERT(serial != RT_NULL);
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struct rt_serial_rx_fifo *rx_fifo
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DMA_HandleTypeDef *DMA_Handle;
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struct dma_config *dma_config;
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struct stm32_uart *uart = (struct stm32_uart *)serial->parent.user_data;
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struct stm32_uart *uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct stm32_uart *)serial->parent.user_data;
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RT_ASSERT(uart != RT_NULL);
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if (RT_DEVICE_FLAG_DMA_RX == flag)
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