diff options
| author | 周传福 <[email protected]> | 2019-05-17 23:23:14 +0800 |
|---|---|---|
| committer | GitHub <[email protected]> | 2019-05-17 23:23:14 +0800 |
| commit | 6ebb2c75d956449fa535481c42933bdb94b691c8 (patch) | |
| tree | 6345a5ceb1cad15e5d5d80547dd5b510d03db1d5 /bsp/stm32/libraries/HAL_Drivers | |
| parent | 9329b62beff829b7e6fcfe285b4267011e6f4d5c (diff) | |
Update drv_usart.c
添加部分空行
Diffstat (limited to 'bsp/stm32/libraries/HAL_Drivers')
| -rw-r--r-- | bsp/stm32/libraries/HAL_Drivers/drv_usart.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c index ff438e2554..7bf0c73912 100644 --- a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c +++ b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c @@ -222,10 +222,12 @@ static rt_size_t stm32_dma_transmit(struct rt_serial_device *serial, rt_uint8_t RT_ASSERT(serial != RT_NULL); uart = (struct stm32_uart *)(serial->parent.user_data); RT_ASSERT(uart != RT_NULL); + if (size == 0) { return 0; } + if (RT_SERIAL_DMA_TX == direction) { if (HAL_UART_Transmit_DMA(&uart->handle, buf, size) == HAL_OK) @@ -652,6 +654,7 @@ static void stm32_dma_config(struct rt_serial_device *serial, rt_ubase_t flag) DMA_Handle->Init.MemInc = DMA_MINC_ENABLE; DMA_Handle->Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; DMA_Handle->Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; + if (RT_DEVICE_FLAG_DMA_RX == flag) { DMA_Handle->Init.Direction = DMA_PERIPH_TO_MEMORY; @@ -662,6 +665,7 @@ static void stm32_dma_config(struct rt_serial_device *serial, rt_ubase_t flag) DMA_Handle->Init.Direction = DMA_MEMORY_TO_PERIPH; DMA_Handle->Init.Mode = DMA_NORMAL; } + DMA_Handle->Init.Priority = DMA_PRIORITY_MEDIUM; #if defined(SOC_SERIES_STM32F4) || defined(SOC_SERIES_STM32F7) DMA_Handle->Init.FIFOMode = DMA_FIFOMODE_DISABLE; |