【stm32】hal库学习笔记-UART/USART串口通信（超详细！）_业界新闻

【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 <string.h> 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 */