STM32实现万年历代码

以下是基于STM32的万年历代码，实现了年、月、日、星期的显示和计算：

#include "stm32f10x.h"
#include "stdio.h"

void Delay(__IO uint32_t nCount) {
  while(nCount--) {
  }
}

void USART1_Init(void) {
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Tx;
  USART_Init(USART1, &USART_InitStructure);

  USART_Cmd(USART1, ENABLE);
}

void USART1_Send(char *pucBuffer) {
  while (*pucBuffer) {
    USART_SendData(USART1, (uint16_t) *pucBuffer++);
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
  }
}

void RTC_Configuration(void) {
  ErrorStatus HSEStartUpStatus;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);

  PWR_BackupAccessCmd(ENABLE);
  BKP_DeInit();

  if (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET) {
    RCC_HSEConfig(RCC_HSE_ON);
    HSEStartUpStatus = RCC_WaitForHSEStartUp();

    if (HSEStartUpStatus == SUCCESS) {
      RCC_HCLKConfig(RCC_SYSCLK_Div1);
      RCC_PCLK2Config(RCC_HCLK_Div1);
      RCC_PCLK1Config(RCC_HCLK_Div2);
      RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
      RCC_PLLCmd(ENABLE);

      while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);

      RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

      while (RCC_GetSYSCLKSource() != 0x08);
    }
  }

  RCC_LSEConfig(RCC_LSE_ON);

  while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);

  RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
  RCC_RTCCLKCmd(ENABLE);
  RTC_WaitForSynchro();
  RTC_WaitForLastTask();
  RTC_SetPrescaler(32767);
  RTC_WaitForLastTask();
}

uint8_t RTC_Init(void) {
  RTC_Configuration();
  RTC_WaitForLastTask();
  RTC_EnterConfigMode();
  RTC_WaitForLastTask();
  RTC_SetCounter(0);
  RTC_WaitForLastTask();
  RTC_SetAlarm(86400);
  RTC_WaitForLastTask();
  RTC_ExitConfigMode();
  RTC_WaitForLastTask();

  return 0;
}

uint8_t RTC_Check(void) {
  if (RTC_GetFlagStatus(RTC_FLAG_SEC) == SET) {
    RTC_ClearFlag(RTC_FLAG_SEC);
    return 1;
  }

  return 0;
}

uint32_t RTC_GetCounter(void) {
  uint32_t counter = 0;

  counter = RTC_GetCounter();

  return counter;
}

uint8_t RTC_GetHour(void) {
  uint32_t counter = 0;
  uint8_t hour = 0;

  counter = RTC_GetCounter();
  hour = (counter / 3600) % 24;

  return hour;
}

uint8_t RTC_GetMinute(void) {
  uint32_t counter = 0;
  uint8_t minute = 0;

  counter = RTC_GetCounter();
  minute = (counter / 60) % 60;

  return minute;
}

uint8_t RTC_GetSecond(void) {
  uint32_t counter = 0;
  uint8_t second = 0;

  counter = RTC_GetCounter();
  second = counter % 60;

  return second;
}

uint8_t RTC_GetYear(void) {
  uint32_t counter = 0;
  uint16_t year = 0;

  counter = RTC_GetCounter();
  year = 1970 + counter / 31536000;

  return year;
}

uint8_t RTC_GetMonth(void) {
  uint32_t counter = 0;
  uint8_t month = 0;

  counter = RTC_GetCounter();
  month = ((counter % 31536000) / 2592000) + 1;

  return month;
}

uint8_t RTC_GetDay(void) {
  uint32_t counter = 0;
  uint8_t day = 0;

  counter = RTC_GetCounter();
  day = ((counter % 31536000) % 2592000) / 86400 + 1;

  return day;
}

uint8_t RTC_GetWeekday(void) {
  uint32_t counter = 0;
  uint8_t weekday = 0;

  counter = RTC_GetCounter();
  weekday = ((counter / 86400) + 4) % 7;

  return weekday;
}

int main(void) {
  char Buffer[80];
  uint8_t year, month, day, weekday, hour, minute, second;

  USART1_Init();
  RTC_Init();

  while (1) {
    if (RTC_Check()) {
      year = RTC_GetYear();
      month = RTC_GetMonth();
      day = RTC_GetDay();
      weekday = RTC_GetWeekday();
      hour = RTC_GetHour();
      minute = RTC_GetMinute();
      second = RTC_GetSecond();

      sprintf(Buffer, "Date: %d/%d/%d, Weekday: %d, Time: %d:%d:%d\r\n", year, month, day, weekday, hour, minute, second);
      USART1_Send(Buffer);
    }

    Delay(0xFFFFF);
  }
}

该代码使用STM32的RTC模块实现了时间的计算，并将年、月、日、星期和时间通过USART串口通信输出。其中，RTC_Configuration()函数用于配置STM32的时钟源和RTC模块，RTC_Init()函数用于初始化RTC模块，RTC_Check()函数用于检测RTC计数器是否发生溢出，RTC_GetCounter()函数用于获取RTC计数器的值，RTC_GetHour()、RTC_GetMinute()和RTC_GetSecond()函数用于分别获取当前的小时、分钟和秒数，RTC_GetYear()、RTC_GetMonth()和RTC_GetDay()函数用于分别获取当前的年、月和日，RTC_GetWeekday()函数用于获取当前的星期。