研究stm32f429 usart dma,单独配置完串口发送数据没问题，加上DMA之后数据发不出去，dma也没有办法debug看数据。有没有什么方法可以帮助我debug？

这一段是配置usart2 [mw_shl_code=c,true] /*##-1- Configure the UART2 peripheral ######################################*/ /* Put the USART2 peripheral in the Asynchronous mode (UART Mode) */ /* UART2 configured as follow: - Word Length = 8 Bits - Stop Bit = One Stop bit - Parity = ODD parity - BaudRate = 9600 baud - Hardware flow control disabled (RTS and CTS signals) */ UartHandle.Instance = USARTx; UartHandle.Init.BaudRate = 9600; UartHandle.Init.WordLength = UART_WORDLENGTH_8B; UartHandle.Init.StopBits = UART_STOPBITS_1; UartHandle.Init.Parity = UART_PARITY_NONE; UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE; UartHandle.Init.Mode = UART_MODE_TX_RX; // UartHandle.Init.OverSampling = UART_OVERSAMPLING_16; if(HAL_UART_Init(&UartHandle) != HAL_OK) { /* Initialization Error */ Error_Handler(); } if(HAL_UART_Transmit(&UartHandle, (uint8_t*)a, 4, 5000)!= HAL_OK) { Error_Handler(); } [/mw_shl_code] 配置dma
[mw_shl_code=c,true]void HAL_UART_MspInit(UART_HandleTypeDef *huart) { static DMA_HandleTypeDef hdma_tx; static DMA_HandleTypeDef hdma_rx; GPIO_InitTypeDef GPIO_InitStruct; /*##-1- Enable peripherals and GPIO Clocks #################################*/ /* Enable GPIO clock */ USARTx_TX_GPIO_CLK_ENABLE(); USARTx_RX_GPIO_CLK_ENABLE(); /* Enable USART2 clock */ USARTx_CLK_ENABLE(); /* Enable DMA2 clock */ DMAx_CLK_ENABLE(); /*##-2- Configure peripheral GPIO ##########################################*/ /* UART TX GPIO pin configuration */ GPIO_InitStruct.Pin = USARTx_TX_PIN; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FAST; GPIO_InitStruct.Alternate = USARTx_TX_AF; HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct); /* UART RX GPIO pin configuration */ GPIO_InitStruct.Pin = USARTx_RX_PIN; GPIO_InitStruct.Alternate = USARTx_RX_AF; HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct); /*##-3- Configure the DMA streams ##########################################*/ /* Configure the DMA handler for Transmission process */ hdma_tx.Instance = USARTx_TX_DMA_STREAM; hdma_tx.Init.Channel = USARTx_TX_DMA_CHANNEL; hdma_tx.Init.Direction = DMA_MEMORY_TO_PERIPH; hdma_tx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_tx.Init.MemInc = DMA_MINC_ENABLE; hdma_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; hdma_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_tx.Init.Mode = DMA_NORMAL; hdma_tx.Init.Priority = DMA_PRIORITY_LOW; hdma_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE; hdma_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL; hdma_tx.Init.MemBurst = DMA_MBURST_INC4; hdma_tx.Init.PeriphBurst = DMA_PBURST_INC4; HAL_DMA_Init(&hdma_tx); /* Associate the initialized DMA handle to the UART handle */ __HAL_LINKDMA(huart, hdmatx, hdma_tx); /*##-4- Configure the NVIC for DMA #########################################*/ /* NVIC configuration for DMA transfer complete interrupt (USART2_TX) */ HAL_NVIC_SetPriority(USARTx_DMA_TX_IRQn, 0, 1); HAL_NVIC_EnableIRQ(USARTx_DMA_TX_IRQn); } [/mw_shl_code] usart dma 发送数据函数
[mw_shl_code=c,true]/** * @brief Sends an amount of data in non blocking mode. * @param huart: pointer to a UART_HandleTypeDef structure that contains * the configuration information for the specified UART module. * @param pData: Pointer to data buffer * @param Size: Amount of data to be sent * @retval HAL status */ HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) { uint32_t *tmp; uint32_t tmp1 = 0; tmp1 = huart->State; if((tmp1 == HAL_UART_STATE_READY) || (tmp1 == HAL_UART_STATE_BUSY_RX)) { if((pData == NULL ) || (Size == 0)) { return HAL_ERROR; } /* Process Locked */ __HAL_LOCK(huart); huart->pTxBuffPtr = pData; huart->TxXferSize = Size; huart->TxXferCount = Size; huart->ErrorCode = HAL_UART_ERROR_NONE; /* Check if a receive process is ongoing or not */ if(huart->State == HAL_UART_STATE_BUSY_RX) { huart->State = HAL_UART_STATE_BUSY_TX_RX; } else { huart->State = HAL_UART_STATE_BUSY_TX; } /* Set the UART DMA transfer complete callback */ huart->hdmatx->XferCpltCallback = UART_DMATransmitCplt; /* Set the UART DMA Half transfer complete callback */ huart->hdmatx->XferHalfCpltCallback = UART_DMATxHalfCplt; /* Set the DMA error callback */ huart->hdmatx->XferErrorCallback = UART_DMAError; /* Enable the UART transmit DMA Stream */ tmp = (uint32_t*)&pData; HAL_DMA_Start_IT(huart->hdmatx, *(uint32_t*)tmp, (uint32_t)&huart->Instance->DR, Size); /* Enable the DMA transfer for transmit request by setting the DMAT bit in the UART CR3 register */ huart->Instance->CR3 |= USART_CR3_DMAT; /* Process Unlocked */ __HAL_UNLOCK(huart); return HAL_OK; } else { return HAL_BUSY; } }[/mw_shl_code]
.h文件
[mw_shl_code=c,true]/* User can use this section to tailor USARTx/UARTx instance used and associated resources */ /* Definition for USARTx clock resources */ #define USARTx USART2 #define USARTx_CLK_ENABLE() __USART2_CLK_ENABLE(); #define DMAx_CLK_ENABLE() __DMA2_CLK_ENABLE() #define USARTx_RX_GPIO_CLK_ENABLE() __GPIOD_CLK_ENABLE() #define USARTx_TX_GPIO_CLK_ENABLE() __GPIOD_CLK_ENABLE() #define USARTx_FORCE_RESET() __USART2_FORCE_RESET() #define USARTx_RELEASE_RESET() __USART2_RELEASE_RESET() /* Definition for USARTx Pins */ #define USARTx_TX_PIN GPIO_PIN_6 #define USARTx_TX_GPIO_PORT GPIOD #define USARTx_TX_AF GPIO_AF7_USART2 #define USARTx_RX_PIN GPIO_PIN_5 #define USARTx_RX_GPIO_PORT GPIOD #define USARTx_RX_AF GPIO_AF7_USART2 /* Definition for USARTx's DMA */ #define USARTx_TX_DMA_CHANNEL DMA_CHANNEL_4 #define USARTx_TX_DMA_STREAM DMA2_Stream7 #define USARTx_RX_DMA_CHANNEL DMA_CHANNEL_4 #define USARTx_RX_DMA_STREAM DMA2_Stream5 /* Definition for USARTx's NVIC */ #define USARTx_DMA_TX_IRQn DMA2_Stream7_IRQn #define USARTx_DMA_RX_IRQn DMA2_Stream5_IRQn #define USARTx_DMA_TX_IRQHandler DMA2_Stream7_IRQHandler #define USARTx_DMA_RX_IRQHandler DMA2_Stream5_IRQHandler[/mw_shl_code]


这些配置基本上都是官方的例程，不知道出了什么问题。