前置文章：
Freertos手把手教STM32CubeMx设置STM32F4芯片DMA发送ADC数据（一）-CSDN博客Freertos手把手教STM32CubeMx设置STM32F4芯片DMA发送ADC数据（二）-CSDN博客
Freertos手把手教STM32CubeMx设置STM32F4芯片DMA发送ADC数据（三）-CSDN博客Freertos手把手教STM32CubeMx设置STM32F4芯片DMA发送ADC数据（四）-CSDN博客
在以上章节完成了对框架的初步探索以及对CubeMx的配置
在freertos的task中对buffer进行了一些测试
实现了ADC的启动 ，并且进入对应中断，发送ADC转换数据到任务1 ， 然后任务1进行接收并且打印的功能
但是现在看起来这个转换只能进行一次 ， 下面要对代码进行改进，以实现以下功能
下面继续上一章的内容继续完成本次目标
本期目标
理清本工程系统框架
弄懂CubeMx配置相关原理及设置的背后含义
对DMA以及ADC相关的重要API接口使用详解
梳理代码设计流程
线程A接收到邮箱后，实现两个任务
任务一：将DMA的下次目标Buffer设置为Buffer2
任务二：发送消息队列（邮箱）给线程B，然后回到邮箱接收处阻塞住
先将接收移到for循环里
for(;;) { printf("hello world \r\n"); ret_queue = xQueueReceive( xQueue1, &queue_data_2, portMAX_DELAY); printf("xQueueSend ret_queue = [%ld]\r\n" , ret_queue); printf("xQueueReceive queue_data_2 = [%d]\r\n" , queue_data_2); // osDelay(1000); }portMAX_DELAY
阻塞的意义：
如果没有接收到队列信息后，会一直阻塞在这里，知道有中断发送过来后，才会离开
邮箱
xQueue1 = xQueueCreate(10 , 4 );每个元素的大小是四个字节
回到正题
想要实现接收邮箱的切换实际上很简单 ， 设立一个标志位切换就好了
uint32_t DMA_point = 0; //for(;;) { printf("hello world \r\n"); ret_queue = xQueueReceive( xQueue1, &queue_data_2, portMAX_DELAY); printf("xQueueSend ret_queue = [%ld]\r\n" , ret_queue); printf("xQueueReceive queue_data_2 = [%d]\r\n" , queue_data_2); if( 0 == DMA_point) { printf("buffer1 data = [%d] \r\n" , buffer1[0]); HAL_ADC_Start_DMA(&hadc1 , buffer2 , BUFFER_SIZE); //将接收下一个数据的地址换成buffer2 DMA_point = 1 ; } else { DMA_point = 0 ; printf("buffer2 data = [%d] \r\n" , buffer2[0]); HAL_ADC_Start_DMA(&hadc1 , buffer1 , BUFFER_SIZE); //将接收下一个数据的地址换成buffer2 }在point = 0 的时候由buffer1接收
在point = 1 的时候由buffer2接收
在接收完之后对point进行对应的操作，从而切换接收数组
由此完成
可以看到数据非常丝滑的在切换
本期代码：
/* USER CODE BEGIN Header */ /** ****************************************************************************** * File Name : freertos.c * Description : Code for freertos applications ****************************************************************************** * @attention * * Copyright (c) 2025 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "FreeRTOS.h" #include "task.h" #include "main.h" #include "cmsis_os.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include <stdlib.h> #include "queue.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ #define BUFFER_SIZE 1 uint32_t * buffer1 = NULL; uint32_t * buffer2 = NULL; /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ #define DMA_ADC_CPLT_INT 0xA1 /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ /* USER CODE BEGIN Variables */ extern ADC_HandleTypeDef hadc1; extern DMA_HandleTypeDef hdma_adc1; QueueHandle_t xQueue1 = NULL; uint32_t DMA_point = 0; // /* USER CODE END Variables */ /* Definitions for defaultTask */ osThreadId_t defaultTaskHandle; const osThreadAttr_t defaultTask_attributes = { .name = "defaultTask", .stack_size = 128 * 4, .priority = (osPriority_t) osPriorityNormal, }; /* Private function prototypes -----------------------------------------------*/ /* USER CODE BEGIN FunctionPrototypes */ /* USER CODE END FunctionPrototypes */ void StartDefaultTask(void *argument); void MX_FREERTOS_Init(void); /* (MISRA C 2004 rule 8.1) */ /** * @brief FreeRTOS initialization * @param None * @retval None */ void MX_FREERTOS_Init(void) { /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* USER CODE BEGIN RTOS_MUTEX */ /* add mutexes, ... */ /* USER CODE END RTOS_MUTEX */ /* USER CODE BEGIN RTOS_SEMAPHORES */ /* add semaphores, ... */ /* USER CODE END RTOS_SEMAPHORES */ /* USER CODE BEGIN RTOS_TIMERS */ /* start timers, add new ones, ... */ /* USER CODE END RTOS_TIMERS */ /* USER CODE BEGIN RTOS_QUEUES */ /* add queues, ... */ /* USER CODE END RTOS_QUEUES */ /* Create the thread(s) */ /* creation of defaultTask */ defaultTaskHandle = osThreadNew(StartDefaultTask, NULL, &defaultTask_attributes); /* USER CODE BEGIN RTOS_THREADS */ /* add threads, ... */ /* USER CODE END RTOS_THREADS */ /* USER CODE BEGIN RTOS_EVENTS */ /* add events, ... */ /* USER CODE END RTOS_EVENTS */ } /* USER CODE BEGIN Header_StartDefaultTask */ /** * @brief Function implementing the defaultTask thread. * @param argument: Not used * @retval None */ /* USER CODE END Header_StartDefaultTask */ void StartDefaultTask(void *argument) { /* USER CODE BEGIN StartDefaultTask */ DMA_point = 0 ;//DMA_point = 0 往buffer1存入数据 //DMA_point = 1 往buffer2存入数据 buffer1 = (uint32_t *)malloc((sizeof(uint32_t)* BUFFER_SIZE)); buffer2 = (uint32_t *)malloc((sizeof(uint32_t)* BUFFER_SIZE)); if(NULL == buffer1) { printf("buffer1 malloc failed \r\n"); } if(NULL == buffer2) { printf("buffer2 malloc failed \r\n"); return; } printf("buffer1 , buffer2 malloc success\r\n "); memset(buffer1, 0xff , (sizeof(uint32_t)* BUFFER_SIZE)); memset(buffer2, 0xff , (sizeof(uint32_t)* BUFFER_SIZE)); printf("Unit test ADC + DMA\r\n "); xQueue1 = xQueueCreate(10 , 4 ); if(NULL == xQueue1) { printf("Queue create failed \r\n"); return ; } HAL_StatusTypeDef ret1 = HAL_OK; HAL_StatusTypeDef ret2 = HAL_OK; ret1 = HAL_ADC_Start_DMA(&hadc1, buffer1, BUFFER_SIZE); ret2 = HAL_ADC_Start_DMA(&hadc1, buffer2, BUFFER_SIZE); if(HAL_OK != ret1) { printf("HAL_ADC1 call failed "); } if(HAL_OK != ret2) { printf("HAL_ADC2 call failed "); } //UnitTest Queue send and receive BaseType_t ret_queue = pdPASS; uint32_t queue_data_2 = 0xff; /* Infinite loop */ for(;;) { printf("hello world \r\n"); ret_queue = xQueueReceive( xQueue1, &queue_data_2, portMAX_DELAY); printf("xQueueSend ret_queue = [%ld]\r\n" , ret_queue); printf("xQueueReceive queue_data_2 = [%d]\r\n" , queue_data_2); if( 0 == DMA_point) { printf("buffer1 data = [%d] \r\n" , buffer1[0]); HAL_ADC_Start_DMA(&hadc1 , buffer2 , BUFFER_SIZE); //将接收下一个数据的地址换成buffer2 DMA_point = 1 ; } else { DMA_point = 0 ; printf("buffer2 data = [%d] \r\n" , buffer2[0]); HAL_ADC_Start_DMA(&hadc1 , buffer1 , BUFFER_SIZE); //将接收下一个数据的地址换成buffer2 } // osDelay(1000); } /* USER CODE END StartDefaultTask */ } /* Private application code --------------------------------------------------*/ /* USER CODE BEGIN Application */ void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) { /* Prevent unused argument(s) compilation warning */ UNUSED(hadc); /* NOTE : This function Should not be modified, when the callback is needed, the HAL_ADC_ConvCpltCallback could be implemented in the user file */ //printf("buffer1 data = [%d] \r\n" , buffer1[0]); BaseType_t xHigherPriorityTaskWoken;//PendSV悬起置位为true xHigherPriorityTaskWoken = pdFALSE;//初始化 uint32_t dma_pattern_cplt = DMA_ADC_CPLT_INT; BaseType_t ret_queue = pdPASS; ret_queue = xQueueSendFromISR( xQueue1, &dma_pattern_cplt, &xHigherPriorityTaskWoken ); if( xHigherPriorityTaskWoken ) { taskYIELD (); } printf("QueueSend ret_queue = [%ld]\r\n" , ret_queue); } void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc) { /* Prevent unused argument(s) compilation warning */ UNUSED(hadc); /* NOTE : This function Should not be modified, when the callback is needed, the HAL_ADC_ErrorCallback could be implemented in the user file */ printf("ADC trasfer error \r\n"); } /* USER CODE END Application */
