【stm32】hal库学习笔记-UART/USART串口通信

hal库驱动函数

CubeMX图形化配置

导入LCD.ioc
RTC设置

时钟树配置
设置LSE为RTC时钟源
USART设置
中断设置

程序编写

编写主函数

  /* USER CODE BEGIN 2 */   lcd_init();   lcd_show_str(10, 10, 16, "Demo12_1:USART1-CH340", RED);   lcd_show_str(10, 30, 16, "Please connect board with PC", RED);   lcd_show_str(10, 50, 16, "via MiniUSB line before power on", RED);    uint8_t hello1[] = "Hello, blocking\n";   HAL_UART_Transmit(&huart1, hello1, sizeof(hello1), 500);   HAL_Delay(10);    uint8_t hello2[] = "Hello, none blocking\n";   HAL_UART_Transmit_IT(&huart1, hello2, sizeof(hello2));    lcd_show_str(10, 90, 16, "Received command string is: ", RED);   HAL_UART_Receive_IT(&huart1, rxBuffer, RX_CMD_LEN);    /* USER CODE END 2 */ 

在rtc.c中重写回调函数

/* USER CODE BEGIN 1 */ void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc) { 	RTC_TimeTypeDef sTime; 	RTC_DateTypeDef sDate; 	if (HAL_RTC_GetTime(hrtc, &sTime, RTC_FORMAT_BIN) == HAL_OK) { 		HAL_RTC_GetDate(hrtc, &sDate, RTC_FORMAT_BIN); 		uint8_t timeStr[20]; 		sprintf(timeStr, "%2d:%2d:%2d\n", sTime.Hours, sTime.Minutes, sTime.Seconds); 		lcd_show_str(30, 70, 16, timeStr, BLACK); 		if (isUploadTime) { 			HAL_UART_Transmit(&huart1, timeStr, strlen(timeStr), 200); 		} 	} } /* USER CODE END 1 */ 

在usart.h文件中编写定义

/* USER CODE BEGIN Private defines */ #define RX_CMD_LEN 5 extern uint8_t rxBuffer[]; extern uint8_t isUploadTime; /* USER CODE END Private defines */ 

编写usart.c

/* USER CODE BEGIN 0 */ #include "rtc.h" #include "lcd.h" #include   uint8_t proBuffer[10] = "#S45;\n"; uint8_t rxBuffer[10] = "#H12;\n"; uint8_t rxCompleted = RESET; uint8_t isUploadTime = 1; /* USER CODE END 0 */ 

/* USER CODE BEGIN 1 */ void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { 	if (huart->Instance == USART1) { 		rxCompleted = SET; 		for (uint16_t i = 0; i < RX_CMD_LEN; i++) { 			proBuffer[i] = rxBuffer[i]; 			__HAL_UART_ENABLE_IT(huart, UART_IT_IDLE); 		} 	} }  void on_UART_IDLE(UART_HandleTypeDef *huart) { 	if (__HAL_UART_GET_FLAG(huart, UART_FLAG_IDLE) == RESET) { 		return; 	} 	__HAL_UART_CLEAR_IDLEFLAG(huart); 	__HAL_UART_DISABLE_IT(huart, UART_IT_IDLE); 	if (rxCompleted) { 		HAL_UART_Transmit(huart, proBuffer, strlen(proBuffer), 100); 		HAL_Delay(10); 		updateRTCTime(); 		lcd_show_str(30, 110, 16, proBuffer, BLACK); 		rxCompleted = RESET; 		HAL_UART_Receive_IT(huart, rxBuffer, RX_CMD_LEN); 	} }  void updateRTCTime() { 	if (proBuffer[0] != '#') { 		return; 	} 	uint8_t timeSection = proBuffer[1]; 	uint8_t temp10 = proBuffer[2] - '0'; 	uint8_t temp1 = proBuffer[3] - '0'; 	uint8_t value = 10 * temp10 + temp1; 	if (timeSection == 'U') { 		isUploadTime = value; 		return; 	}  	RTC_TimeTypeDef sTime; 	RTC_DateTypeDef sDate; 	if (HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN) == HAL_OK) { 		HAL_RTC_GetDate(&hrtc, &sDate, RTC_FORMAT_BIN);  		sTime.DayLightSaving = 0; 		sTime.StoreOperation = 0;  		if (timeSection == 'H') { 			sTime.Hours = value; 		} else if (timeSection == 'M') { 			sTime.Minutes = value; 		} else if (timeSection == 'S') { 			sTime.Seconds = value; 		} 		HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN); 	} }  /* USER CODE END 1 */ 

实现效果