![shequ.stmicroelectronics.cn](./template/st_v1/static/img/logo2.png)
采用STM32H743芯片, 实现UART DMA收发数据. 用图形化的界面配置了设置, UART配置成DMA模式, 之后通过HAL_UART_Transmit_DMA发送数据, 中断报发送错误(DMA_FLAG_TEIF0_4), 总线上也没有数据输出. 以下是初始化部分代码: static void MX_UART4_Init(void) { huart4.Instance = UART4; huart4.Init.BaudRate = 115200; huart4.Init.WordLength = UART_WORDLENGTH_8B; huart4.Init.StopBits = UART_STOPBITS_1; huart4.Init.Parity = UART_PARITY_NONE; huart4.Init.Mode = UART_MODE_TX_RX; huart4.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart4.Init.OverSampling = UART_OVERSAMPLING_16; huart4.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE; huart4.Init.Prescaler = UART_PRESCALER_DIV1; huart4.Init.FIFOMode = UART_FIFOMODE_DISABLE; huart4.Init.TXFIFOThreshold = UART_TXFIFO_THRESHOLD_1_8; huart4.Init.RXFIFOThreshold = UART_RXFIFO_THRESHOLD_1_8; huart4.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT; if (HAL_UART_Init(&huart4) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } } void HAL_UART_MspInit(UART_HandleTypeDef* huart) { GPIO_InitTypeDef GPIO_InitStruct; if(huart->Instance==UART4) { /* USER CODE BEGIN UART4_MspInit 0 */ /* USER CODE END UART4_MspInit 0 */ /* Peripheral clock enable */ __HAL_RCC_UART4_CLK_ENABLE(); /**UART4 GPIO Configuration PA0-WKUP ------> UART4_TX PA11 ------> UART4_RX */ GPIO_InitStruct.Pin = GPIO_PIN_0; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; GPIO_InitStruct.Alternate = GPIO_AF8_UART4; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_11; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; GPIO_InitStruct.Alternate = GPIO_AF6_UART4; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); /* UART4 DMA Init */ /* UART4_TX Init */ hdma_uart4_tx.Instance = DMA1_Stream0; hdma_uart4_tx.Init.Request = DMA_REQUEST_UART4_TX; hdma_uart4_tx.Init.Direction = DMA_MEMORY_TO_PERIPH; hdma_uart4_tx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_uart4_tx.Init.MemInc = DMA_MINC_ENABLE; hdma_uart4_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; hdma_uart4_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_uart4_tx.Init.Mode = DMA_NORMAL; hdma_uart4_tx.Init.Priority = DMA_PRIORITY_LOW; hdma_uart4_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE; if (HAL_DMA_Init(&hdma_uart4_tx) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } __HAL_LINKDMA(huart,hdmatx,hdma_uart4_tx); /* UART4_RX Init */ hdma_uart4_rx.Instance = DMA1_Stream1; hdma_uart4_rx.Init.Request = DMA_REQUEST_UART4_RX; hdma_uart4_rx.Init.Direction = DMA_PERIPH_TO_MEMORY; hdma_uart4_rx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_uart4_rx.Init.MemInc = DMA_MINC_ENABLE; hdma_uart4_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; hdma_uart4_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_uart4_rx.Init.Mode = DMA_CIRCULAR; hdma_uart4_rx.Init.Priority = DMA_PRIORITY_LOW; hdma_uart4_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE; if (HAL_DMA_Init(&hdma_uart4_rx) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } __HAL_LINKDMA(huart,hdmarx,hdma_uart4_rx); /* UART4 interrupt Init */ HAL_NVIC_SetPriority(UART4_IRQn, 0, 0); HAL_NVIC_EnableIRQ(UART4_IRQn); /* USER CODE BEGIN UART4_MspInit 1 */ /* USER CODE END UART4_MspInit 1 */ } } 调用 if(HAL_UART_Transmit_DMA(&huart4, (uint8_t *)cmd_37, 1/*sizeof(cmd_37)*/)!= HAL_OK) //if(HAL_UART_Transmit(&huart4, (uint8_t *)cmd_37, sizeof(cmd_37), 1000)!= HAL_OK) { Error_Handler(); } DMA产生了中断, 中断源是发送错误. 补充: 通过HAL_UART_Transmit(&huart4, (uint8_t *)cmd_37, sizeof(cmd_37), 1000)发送, 串口是可以正常看到数据发送的, 可以排除串口本身的问题. |
猜想无非就是检查时钟配置,IO配置、复用功能配置。配置USARTx中断优先级,启用NVIC USART中断句柄。实际使用时只需把要发送的数据准备好,调用Uart_Send_Data。 Uart_Send_Data("AT+VERSION\r\n", 12); 唉,说不好了,我有空再研究研究
要不你自己参考,【STM32H743网络-----分享调试经验及注意事项】
https://www.stmcu.org.cn/module/forum/thread-615089-1-1.html
https://www.stmcu.org.cn/module/forum/thread-616379-1-1.html
评分
查看全部评分
收到,谢谢
评分
查看全部评分