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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