- 本帖最后由 miaomiao 于 2020-6-29 17:19 编辑 *
如题：在使用串口3的DMA接收模式时，使用官方的例程，并且在CubeMX下配置了串口3和DMA，但是在以下程序中串口设备无法打开
ret = rt_device_open(serial, RT_DEVICE_FLAG_DMA_RX);
if(ret != RT_EOK)
{
rt_kprintf(“rt_device_open uart3 failed!
“);
}
这是我的串口和DMA初始化程序
else if(huart->Instance==USART3)
{
/ USER CODE BEGIN USART3_MspInit 0 /
/ USER CODE END USART3_MspInit 0 /
/ Peripheral clock enable /
__HAL_RCC_USART3_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();/**USART3 GPIO Configuration PB10 ------> USART3_TXPB11 ------> USART3_RX */GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11;GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;GPIO_InitStruct.Alternate = GPIO_AF7_USART3;HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);/* USART3 DMA Init *//* USART3_RX Init */hdma_usart3_rx.Instance = DMA1_Stream1;hdma_usart3_rx.Init.Channel = DMA_CHANNEL_4;hdma_usart3_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;hdma_usart3_rx.Init.PeriphInc = DMA_PINC_DISABLE;hdma_usart3_rx.Init.MemInc = DMA_MINC_ENABLE;hdma_usart3_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;hdma_usart3_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;hdma_usart3_rx.Init.Mode = DMA_NORMAL;hdma_usart3_rx.Init.Priority = DMA_PRIORITY_VERY_HIGH;hdma_usart3_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;if (HAL_DMA_Init(&hdma_usart3_rx) != HAL_OK){ Error_Handler();}__HAL_LINKDMA(huart,hdmarx,hdma_usart3_rx);/* USART3 interrupt Init */HAL_NVIC_SetPriority(USART3_IRQn, 0, 0);HAL_NVIC_EnableIRQ(USART3_IRQn);
/ USER CODE BEGIN USART3_MspInit 1 /
/ USER CODE END USART3_MspInit 1 /
}
