参考帖子：https://blog.csdn.net/freedompoi/article/details/122350866

(相关资料图)

目前想要实现STM32F4自带的DMA双缓冲区，尝试过一版，结果不能预期，就使用了RxHalfCplt和RxCplt去实现DMA双缓冲区的效果。

现在有时间了，又重新实现STM32F4自带的DMA双缓冲区，作为参考。

MCU：STM32F429ZIT6

开发环境：STM32CubeMX+MDK5

此时，双击完后会关闭此界面，然后打开一个新界面。

然后，我们开始基本配置。

现在我们选择一个LED作为系统LED，该步骤可以忽略，只是本人喜欢这样子。以硬件原理图的LD3为例子。

基本配置除了时钟树外，基本上已经配置好了。

现在配置时钟树

基本配置已经配置完，现在开始配置实验使用的内容。

配置USART1，打开USART中断。并打开DMA。

配置FreeRTOS

配置完成，完善工程，生成工程。

到此，STM32CubeMX工具的使用结束！可以发现在桌面已经生成了DMA_DoubleBuf工程。

使用MDK5打开SDCard_rw工程打开。点击魔法棒，勾选微库。选择对应的下载器，勾选下载完复位允许。

在usart.h文件中，加入内容。

1 /* USER CODE BEGIN Header */ 2 /** 3   ****************************************************************************** 4   * @file    usart.h 5   * @brief   This file contains all the function prototypes for 6   *          the usart.c file 7   ****************************************************************************** 8   * @attention 9   *10   * Copyright (c) 2023 STMicroelectronics.11   * All rights reserved.12   *13   * This software is licensed under terms that can be found in the LICENSE file14   * in the root directory of this software component.15   * If no LICENSE file comes with this software, it is provided AS-IS.16   *17   ******************************************************************************18   */19 /* USER CODE END Header */20 /* Define to prevent recursive inclusion -------------------------------------*/21 #ifndef __USART_H__22 #define __USART_H__23 24 #ifdef __cplusplus25 extern "C" {26 #endif27 28 /* Includes ------------------------------------------------------------------*/29 #include "main.h"30 31 /* USER CODE BEGIN Includes */32 #include "cmsis_os.h"33 #include 34 /* USER CODE END Includes */35 36 extern UART_HandleTypeDef huart1;37 38 /* USER CODE BEGIN Private defines */39 40 #define UART_BUFF_SIZE  3041  42 #pragma pack(4)43 typedef struct44 {45     uint16_t len;46     uint8_t  data[UART_BUFF_SIZE];47 }usart_multibuffer_data;48 #pragma pack()49 50 /* USER CODE END Private defines */51 52 void MX_USART1_UART_Init(void);53 54 /* USER CODE BEGIN Prototypes */55 void UART_DMA_MultiBuffer(void);56 /* USER CODE END Prototypes */57 58 #ifdef __cplusplus59 }60 #endif61 62 #endif /* __USART_H__ */

在usart.c文件中，加入内容。

1 /* USER CODE BEGIN Header */  2 /**  3   ******************************************************************************  4   * @file    usart.c  5   * @brief   This file provides code for the configuration  6   *          of the USART instances.  7   ******************************************************************************  8   * @attention  9   * 10   * Copyright (c) 2023 STMicroelectronics. 11   * All rights reserved. 12   * 13   * This software is licensed under terms that can be found in the LICENSE file 14   * in the root directory of this software component. 15   * If no LICENSE file comes with this software, it is provided AS-IS. 16   * 17   ****************************************************************************** 18   */ 19 /* USER CODE END Header */ 20 /* Includes ------------------------------------------------------------------*/ 21 #include "usart.h" 22  23 /* USER CODE BEGIN 0 */ 24 QueueHandle_t           queue_mes;   25 usart_multibuffer_data     uart_buf[2]; 26  27 //DMA 缓存0 传输结束回调函数 28 void DMA_M0_RC_Callback(DMA_HandleTypeDef *hdma) 29 { 30     BaseType_t xHigherPriorityTaskWoken;  31   32     uart_buf[0].len = hdma->Instance->NDTR; 33     xQueueSendFromISR(queue_mes,&uart_buf[0],&xHigherPriorityTaskWoken); 34     portYIELD_FROM_ISR(xHigherPriorityTaskWoken); 35 } 36   37 //DMA 缓存1 传输结束回调函数 38 void DMA_M1_RC_Callback(DMA_HandleTypeDef *hdma) 39 { 40     BaseType_t xHigherPriorityTaskWoken;  41   42     uart_buf[1].len = hdma->Instance->NDTR; 43     xQueueSendFromISR(queue_mes,&uart_buf[1],&xHigherPriorityTaskWoken); 44     portYIELD_FROM_ISR(xHigherPriorityTaskWoken); 45 } 46   47 //DMA 传输错误回调函数 48 void DMA_Error_Callback(DMA_HandleTypeDef *hdma) 49 { 50     //里面做一些异常处理 51 } 52 /* USER CODE END 0 */ 53  54 UART_HandleTypeDef huart1; 55 DMA_HandleTypeDef hdma_usart1_rx; 56  57 /* USART1 init function */ 58  59 void MX_USART1_UART_Init(void) 60 { 61  62   /* USER CODE BEGIN USART1_Init 0 */ 63  64   /* USER CODE END USART1_Init 0 */ 65  66   /* USER CODE BEGIN USART1_Init 1 */ 67  68   /* USER CODE END USART1_Init 1 */ 69   huart1.Instance = USART1; 70   huart1.Init.BaudRate = 115200; 71   huart1.Init.WordLength = UART_WORDLENGTH_8B; 72   huart1.Init.StopBits = UART_STOPBITS_1; 73   huart1.Init.Parity = UART_PARITY_NONE; 74   huart1.Init.Mode = UART_MODE_TX_RX; 75   huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; 76   huart1.Init.OverSampling = UART_OVERSAMPLING_16; 77   if (HAL_UART_Init(&huart1) != HAL_OK) 78   { 79     Error_Handler(); 80   } 81   /* USER CODE BEGIN USART1_Init 2 */ 82  83   /* USER CODE END USART1_Init 2 */ 84  85 } 86  87 void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle) 88 { 89  90   GPIO_InitTypeDef GPIO_InitStruct = {0}; 91   if(uartHandle->Instance==USART1) 92   { 93   /* USER CODE BEGIN USART1_MspInit 0 */ 94  95   /* USER CODE END USART1_MspInit 0 */ 96     /* USART1 clock enable */ 97     __HAL_RCC_USART1_CLK_ENABLE(); 98  99     __HAL_RCC_GPIOA_CLK_ENABLE();100     /**USART1 GPIO Configuration101     PA9     ------> USART1_TX102     PA10     ------> USART1_RX103     */104     GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;105     GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;106     GPIO_InitStruct.Pull = GPIO_NOPULL;107     GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;108     GPIO_InitStruct.Alternate = GPIO_AF7_USART1;109     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);110 111     /* USART1 DMA Init */112     /* USART1_RX Init */113     hdma_usart1_rx.Instance = DMA2_Stream2;114     hdma_usart1_rx.Init.Channel = DMA_CHANNEL_4;115     hdma_usart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;116     hdma_usart1_rx.Init.PeriphInc = DMA_PINC_DISABLE;117     hdma_usart1_rx.Init.MemInc = DMA_MINC_ENABLE;118     hdma_usart1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;119     hdma_usart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;120     hdma_usart1_rx.Init.Mode = DMA_CIRCULAR;121     hdma_usart1_rx.Init.Priority = DMA_PRIORITY_MEDIUM;122     hdma_usart1_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;123     hdma_usart1_rx.XferCpltCallback = DMA_M0_RC_Callback;124     hdma_usart1_rx.XferM1CpltCallback = DMA_M1_RC_Callback;125     hdma_usart1_rx.XferErrorCallback = DMA_Error_Callback;126     if (HAL_DMA_Init(&hdma_usart1_rx) != HAL_OK)127     {128       Error_Handler();129     }130 131     __HAL_LINKDMA(uartHandle,hdmarx,hdma_usart1_rx);132 133     /* USART1 interrupt Init */134     HAL_NVIC_SetPriority(USART1_IRQn, 5, 0);135     HAL_NVIC_EnableIRQ(USART1_IRQn);136   /* USER CODE BEGIN USART1_MspInit 1 */137 138   /* USER CODE END USART1_MspInit 1 */139   }140 }141 142 void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)143 {144 145   if(uartHandle->Instance==USART1)146   {147   /* USER CODE BEGIN USART1_MspDeInit 0 */148 149   /* USER CODE END USART1_MspDeInit 0 */150     /* Peripheral clock disable */151     __HAL_RCC_USART1_CLK_DISABLE();152 153     /**USART1 GPIO Configuration154     PA9     ------> USART1_TX155     PA10     ------> USART1_RX156     */157     HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);158 159     /* USART1 DMA DeInit */160     HAL_DMA_DeInit(uartHandle->hdmarx);161 162     /* USART1 interrupt Deinit */163     HAL_NVIC_DisableIRQ(USART1_IRQn);164   /* USER CODE BEGIN USART1_MspDeInit 1 */165 166   /* USER CODE END USART1_MspDeInit 1 */167   }168 }169 170 /* USER CODE BEGIN 1 */171 //使能DMA172 void UART_DMA_MultiBuffer(void)173 {174     uint32_t u32wk0;175     176     SET_BIT(huart1.Instance->CR3,USART_CR3_DMAR);177     HAL_DMAEx_MultiBufferStart_IT(&hdma_usart1_rx,178                                   (uint32_t)(&huart1.Instance->DR),179                                   (uint32_t)&uart_buf[0].data[0],180                                   (uint32_t)&uart_buf[1].data[0],181                                    UART_BUFF_SIZE);182         183     //这里是解决DMA在启动时，如果接收到大量数据会出现死机的问题184     u32wk0 = huart1.Instance->SR;  185     u32wk0 = huart1.Instance->DR;186     UNUSED(u32wk0);187 }188 189 /* USER CODE END 1 */

在main函数中，加入内容。

1 /** 2   * @brief  The application entry point. 3   * @retval int 4   */ 5 int main(void) 6 { 7   /* USER CODE BEGIN 1 */ 8  9   /* USER CODE END 1 */10 11   /* MCU Configuration--------------------------------------------------------*/12 13   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */14   HAL_Init();15 16   /* USER CODE BEGIN Init */17 18   /* USER CODE END Init */19 20   /* Configure the system clock */21   SystemClock_Config();22 23   /* USER CODE BEGIN SysInit */24 25   /* USER CODE END SysInit */26 27   /* Initialize all configured peripherals */28   MX_GPIO_Init();29   MX_DMA_Init();30   MX_USART1_UART_Init();31   /* USER CODE BEGIN 2 */32     queue_mes = xQueueCreate(10, sizeof(usart_multibuffer_data));33     UART_DMA_MultiBuffer(); 34   /* USER CODE END 2 */35 36   /* Init scheduler */37   osKernelInitialize();  /* Call init function for freertos objects (in freertos.c) */38   MX_FREERTOS_Init();39   /* Start scheduler */40   osKernelStart();41 42   /* We should never get here as control is now taken by the scheduler */43   /* Infinite loop */44   /* USER CODE BEGIN WHILE */45   while (1)46   {47     /* USER CODE END WHILE */48 49     /* USER CODE BEGIN 3 */50   }51   /* USER CODE END 3 */52 }

在freertos.c文件中

1 extern usart_multibuffer_data uart_buf[2]; 2 extern QueueHandle_t queue_mes;   3 usart_multibuffer_data queue_data; 4  5 /* USER CODE BEGIN Header_StartDefaultTask */ 6 /** 7   * @brief  Function implementing the defaultTask thread. 8   * @param  argument: Not used 9   * @retval None10   */11 /* USER CODE END Header_StartDefaultTask */12 void StartDefaultTask(void *argument)13 {14   /* USER CODE BEGIN StartDefaultTask */15     BaseType_t ret = pdFALSE;16   /* Infinite loop */17   for(;;)18   {19     ret = xQueueReceive(queue_mes,&queue_data,portMAX_DELAY);20     if(ret == pdTRUE)21     {22         HAL_UART_Transmit(&huart1,queue_data.data,queue_data.len,100);23     }24   }25   /* USER CODE END StartDefaultTask */26 }

实验效果