RTC (Real Time Clock)：实时时钟

软件设置

• SYS->Debug->Serial Wire
• RCC->HSE->Crystal/Ceramic Resonator
• RCC->LSE->Crystal/Ceramic Resonator

• 时钟树将RTC的频率设置为32.768KHz

• USART1->Mode->Asynchronous

• RTC激活时钟源，激活日历，RTC OUT选择No RTC Output
• 设置日历初始时间日期

• 打开中断

程序修改

main.c中

/* USER CODE BEGIN PV */
RTC_DateTypeDef GetDate;
RTC_TimeTypeDef GetTime;
RTC_AlarmTypeDef sAlarm;
/* 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_RTC_Init();
  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
  __HAL_RTC_SECOND_ENABLE_IT(&hrtc,RTC_IT_SEC);//开启秒中断
  sAlarm.Alarm = RTC_ALARM_A;
  sAlarm.AlarmTime.Hours=17;
  sAlarm.AlarmTime.Minutes=10;
  sAlarm.AlarmTime.Seconds=0;
  HAL_RTC_SetAlarm_IT(&hrtc,&sAlarm,RTC_FORMAT_BIN);//设置闹钟并使能闹钟中断
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
      HAL_Delay(1000);
      HAL_GPIO_TogglePin(LED1_GPIO_Port,LED1_Pin);
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

rtc.c中

定义外部变量

/* USER CODE BEGIN 0 */
#include "stdio.h"
extern RTC_DateTypeDef GetDate;
extern RTC_TimeTypeDef GetTime;
/* USER CODE END 0 */

编写秒中断处理回调函数和闹钟中断处理函数

/* USER CODE BEGIN 1 */
void HAL_RTCEx_RTCEventCallback(RTC_HandleTypeDef *hrtc)
{
    HAL_RTC_GetDate(hrtc,&GetDate,RTC_FORMAT_BIN);
    HAL_RTC_GetTime(hrtc,&GetTime,RTC_FORMAT_BIN);
    printf("Date:%02d-%02d-%02d\r\n",2000+GetDate.Year,GetDate.Month,GetDate.Date);
    printf("Time:%02d:%02d:%02d\r\n",GetTime.Hours,GetTime.Minutes,GetTime.Seconds);
    printf("\r\n");
}
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc){
    printf("Alarm Active...!!!\n");
}
/* USER CODE END 1 */