【STM32CubeMX （12）】USART串口+DMA实现不定长通信

【STM32CubeMX （12）】USART串口+DMA实现不定长通信

usart1_app.c

#include "usart.h"
#include "string.h"
#include "usart1_app.h"

#define BUFFER_SIZE 1024
uint32_t rx1_len=0;
uint8_t rx1_buffer[BUFFER_SIZE];
uint8_t rx1_flag = 0;

void usart1_idle_receive(void)
{
   uint32_t temp;
	 if((__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE) != RESET))//idle标志被置位
	 {
			__HAL_UART_CLEAR_IDLEFLAG(&huart1);//清除标志位
			HAL_UART_DMAStop(&huart1); //  停止DMA传输，防止
			temp  =  __HAL_DMA_GET_COUNTER(&hdma_usart1_rx);// 获取DMA中未传输的数据个数   
			rx1_len =  BUFFER_SIZE - temp; //总计数减去未传输的数据个数，得到已经接收的数据个数	
      rx1_flag = 1;
	 }
}

void usart1_idle_receive_callback(void)
{
  memset(rx1_buffer,0,rx1_len);
	rx1_len = 0;//清除计数
  rx1_flag = 0;//清除接收标志位
  HAL_UART_Receive_DMA(&huart1,rx1_buffer,BUFFER_SIZE);//重新打开DMA接收
}
#include "string.h"
#include "stdarg.h"
void u1_printf(char *fmt, ...) {
	int len;
	char buffer[120]; //足够容纳才可以，可以搞大点
	va_list args;
	va_start(args, fmt);
	vsprintf(buffer, fmt, args);
	va_end(args);

	len = strlen(buffer);

	
  HAL_UART_Transmit(&huart1, (uint8_t *)&buffer, len, 0xffff);
}

usart1_app.h

#ifndef __USART1_APP_H__
#define __USART1_APP_H__

#include "stm32f4xx.h"
#include <stdio.h>


#define BUFFER_SIZE 1024
extern uint32_t rx1_len;
extern uint8_t rx1_flag;
extern uint8_t rx1_buffer[BUFFER_SIZE];

void usart1_idle_receive(void);
void usart1_idle_receive_callback(void);
void u1_printf(char *fmt, ...);
#endif /* __USART1_APP_H__ */

main.c

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2024 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 "dma.h"
#include "usart.h"
#include "gpio.h"
#include "fsmc.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "usart1_app.h"
/* 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 */

/**
 * @brief  The application entry point.
 * @retval int
 */
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_DMA_Init();
  MX_FSMC_Init();
  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
  lcd_init();
	__HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE); //使能IDLE中断	
  HAL_UART_Receive_DMA(&huart1, (uint8_t *)rx1_buffer, BUFFER_SIZE);
  u1_printf("uart DMA ILDE：DMA ilde test\r\n");
  HAL_Delay(2000);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
    if (rx1_flag == 1)
    {
      u1_printf("date:%s",rx1_buffer);
      
      // 清空缓存区
      usart1_idle_receive_callback();
    }
    HAL_Delay(200);
  }
  /* USER CODE END 3 */
}

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

  /** Configure the main internal regulator output voltage
   */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** 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_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 168;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  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_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != 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 */