一.在stm32CubeMX内配置项目

项目配置

1.设置RCC

HSE选择CCR

2.设置SYS

Debug选择Seril Wire

3.设置USART

mode设置为Asynchronous

4.设置NVIC

勾选USART1 global interrupt

5.创建项目

二.代码编写

1.打开项目

2.配置需要的全局变量

char c;//指令 0:停止  1:开始
char message[]="hello Windows\n";//输出信息
char tips[]="CommandError\n";//提示1
char tips1[]="Start.....\n";//提示2
char tips2[]="Stop......\n";//提示3
int flag=0;//标志 0:停止发送 1.开始发送

3.设置接收中断

4.main.c内代码

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2022 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 "main.h"
#include "usart.h"
#include "gpio.h"
#include "string.h"


char getBuffer[100]; 
char value;
char str1[] = "start";
char str2[] = "stop";
char message[]="hello Windows\n";
char tips[]="CommandError\n";
char tips1[]="Start.....\n";
char tips2[]="Stop......\n";
int flag=1;
int countofGetBuffer=0;
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**ep
  * @brief  The application entry point.
  * @retval int
  */
  #define COUNTOF(a) (sizeof(a)/sizeof(*(a)))
	  //jkl
int main(void)
{
    
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  	//设置中断
  HAL_UART_Receive_IT(&huart1, (uint8_t *)&value, 1);
  //HAL_UART_Receive_IT(&huart1, (uint8_t *)&c, 10);


  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    
		if(flag==1){
    
			//发送信息
			HAL_UART_Transmit(&huart1, (uint8_t *)&message,COUNTOF(message),0xFFFF); 
			//延时
			HAL_Delay(1000);
		}else if(flag==0){
    
			HAL_Delay(1000);
		}
  }
}
 
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart1){
    
	HAL_UART_IRQHandler(huart1);
	getBuffer[countofGetBuffer++]=value;
	if(strcmp(getBuffer,str1)==0){
    
		flag = 1;
		HAL_UART_Transmit(huart1, (uint8_t *)&tips1, COUNTOF(tips1),0xFFFF);
		countofGetBuffer = 0;
		memset(getBuffer,0,COUNTOF(getBuffer));
	}else if(strcmp(getBuffer,str2)==0){
    
	    flag = 0;
		HAL_UART_Transmit(huart1, (uint8_t *)&tips2, COUNTOF(tips2),0xFFFF); 
		countofGetBuffer = 0;
		memset(getBuffer,0,COUNTOF(getBuffer));
	}
		//重新设置中断
	HAL_UART_Receive_IT(huart1, (uint8_t *)&value,1);
}

void USART1_IRQHandler(void)
{
    
	 HAL_UART_IRQHandler(&huart1); 
   HAL_UART_Receive_IT(&huart1, (uint8_t *)getBuffer,10);  
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void){
    
  RCC_OscInitTypeDef RCC_OscInitStruct = {
    0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {
    0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
    
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
    
  }
  /* USER CODE END Error_Handler_Debug */
}


#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
    
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

三.DMA配置项目

1.设置RCC

2.设置USART1

添加通道，设置异步模式

使能串口

2.创建项目

3.代码编写

#include "main.h"
#include "dma.h"
#include "usart.h"
#include "gpio.h"
 

void SystemClock_Config(void);
uint8_t flag=1;
uint8_t rx_buf[6];//接收串口数据存放的数组
int strEqual(char rcData[6],char rcData2[6])
	{
    
	for(uint8_t i = 0 ; i < 6 ; i++){
    
		if (rcData[i] != rcData2[i]) return 0;
	}
	return 1;
}
 
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    
	//当输入的指令为“stop!"时,发送提示并改变flag=0
	if(strEqual(rx_buf,"stop!"))
	{
    
		flag=0;
	}
	
	//当输入的指令为"start"时,发送提示并改变flag=1
	else if(strEqual(rx_buf,"start"))
	{
    
		flag=1;
	}
	HAL_UART_Receive_DMA(&huart1,(uint8_t*)rx_buf,5);
}
int main(void)
{
    
  HAL_Init();
  uint8_t message[] = "hello windows!\n";  //定义数据发送数组
  SystemClock_Config();
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART1_UART_Init();
  HAL_UART_Receive_DMA(&huart1,(uint8_t*)rx_buf,5);//设置DMA接收到的数据存放在rx_buf中
  while (1)
  {
    
      if(flag==1)
	  {
    
	    HAL_UART_Transmit_DMA(&huart1, (uint8_t *)message, sizeof(message));
	    HAL_Delay(600);
	  }
  }
}

void SystemClock_Config(void)
{
    
  RCC_OscInitTypeDef RCC_OscInitStruct = {
    0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {
    0};
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    
    Error_Handler();
  }
}

void Error_Handler(void)
{
    
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
    
  }
  /* USER CODE END Error_Handler_Debug */
}
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
    
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

四.编译运行

1.打开flyMCU将程序烧录进单片机

2.打开串口助手查看效果

五.观察波形

1.点开魔法棒工具

2.设置debug相关

3.点击开始调试

4.打开symbol view窗口

5.在special function register内找到USART1_SR

6.查看波形