【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 */
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