Arduino STM32F103（BluePill）教程八 RTC时间

Arduino STM32F103（BluePill）教程八 RTC时间

今天发布一篇纯翻译性质的博文,来自Arduino官方例程(只为保持教程的完整性)

以下是官方源码：串口输出时间波特率115200.

引入了RTC库

#include <RTClock.h>

RTClock rtclock (RTCSEL_LSE); // initialise
int timezone = 8;      // change to your timezone
time_t tt, tt1;
tm_t mtt;
uint8_t dateread[11];
int globAlmCount = 0;
int lastGlobAlmCount;
int SPECAlmCount = 0;
int lastSPECAlmCount;
int alarmcount = 3;
uint8_t AlarmExchange = 0;
bool dispflag = true;

//-----------------------------------------------------------------------------
const char * weekdays[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
const char * months[] = {"Dummy", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
//-----------------------------------------------------------------------------
uint8_t str2month(const char * d)
{
    uint8_t i = 13;
    while ( (--i) && strcmp(months[i], d)!=0 );
    return i;
}
//-----------------------------------------------------------------------------
const char * delim = " :";
char s[128]; // for sprintf
//-----------------------------------------------------------------------------
void ParseBuildTimestamp(tm_t & mt)
{
    // Timestamp format: "Dec  8 2017, 22:57:54"
    sprintf(s, "Timestamp: %s, %s\n", __DATE__, __TIME__);
    //Serial.print(s);
    char * token = strtok(s, delim); // get first token
    // walk through tokens
    while( token != NULL ) {
        uint8_t m = str2month((const char*)token);
        if ( m>0 ) {
            mt.month = m;
            //Serial.print(" month: "); Serial.println(mt.month);
            token = strtok(NULL, delim); // get next token
            mt.day = atoi(token);
            //Serial.print(" day: "); Serial.println(mt.day);
            token = strtok(NULL, delim); // get next token
            mt.year = atoi(token) - 1970;
            //Serial.print(" year: "); Serial.println(mt.year);
            token = strtok(NULL, delim); // get next token
            mt.hour = atoi(token);
            //Serial.print(" hour: "); Serial.println(mt.hour);
            token = strtok(NULL, delim); // get next token
            mt.minute = atoi(token);
            //Serial.print(" minute: "); Serial.println(mt.minute);
            token = strtok(NULL, delim); // get next token
            mt.second = atoi(token);
            //Serial.print(" second: "); Serial.println(mt.second);
        }
        token = strtok(NULL, delim);
    }
}
//-----------------------------------------------------------------------------
// This function is called in the attachSecondsInterrupt
//-----------------------------------------------------------------------------
void SecondCount ()
{
  tt++;
}
//-----------------------------------------------------------------------------
// This function is called in the attachAlarmInterrupt
//-----------------------------------------------------------------------------
void blink ()
{
  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
  globAlmCount++;
}
//-----------------------------------------------------------------------------
void OnOffSerial ()
{
  dispflag = !dispflag;
  SPECAlmCount++;
}
//-----------------------------------------------------------------------------
void setup()
{
  lastGlobAlmCount = ~globAlmCount;
  lastSPECAlmCount = ~SPECAlmCount;
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  //while (!Serial); delay(1000);
  ParseBuildTimestamp(mtt);  // get the Unix epoch Time counted from 00:00:00 1 Jan 1970
  tt = rtclock.makeTime(mtt) + 25; // additional seconds to compensate build and upload delay
  rtclock.setTime(tt);
  tt1 = tt;
  rtclock.attachAlarmInterrupt(blink);// Call blink
  rtclock.attachSecondsInterrupt(SecondCount);// Call SecondCount
}
//-----------------------------------------------------------------------------
void loop()
{
  if ( Serial.available()>10 ) {
    for (uint8_t i = 0; i<11; i++) {
	    dateread[i] = Serial.read();
    }
    Serial.flush();
    tt = atol((char*)dateread);
    rtclock.setTime(rtclock.TimeZone(tt, timezone)); //adjust to your local date
  }
  if (lastGlobAlmCount != globAlmCount || lastSPECAlmCount != SPECAlmCount ) {
    if (globAlmCount == 10) {        // to detachAlarmInterrupt and start creatAlarm after 10 times about 110s
      rtclock.detachAlarmInterrupt();
      globAlmCount = 0;
      rtclock.createAlarm(OnOffSerial, (rtclock.getTime() + 20));   // call OnOffSerial stop output date from Serial after 2 mins
      alarmcount = 20;   //change to creatAlarm  21S close Serial output and 41s open Serial output.
    }
    else {
      lastGlobAlmCount = globAlmCount;
      lastSPECAlmCount = SPECAlmCount;
      Serial.println(" Say hello to every guys ");
      if(dispflag == false)
      Serial.println(" SPECAlarm turn Display Off ");
      switch (AlarmExchange)  {
        case 0:
          rtclock.setAlarmTime(rtclock.getTime() + alarmcount);  // reset alarm = current time + 4s for attachAlarmInterrupt,  21s for creatAlarm
          AlarmExchange = 1;
          break;
        case 1:
          rtclock.breakTime(rtclock.getTime() + alarmcount * 2, mtt);  reset alarm = current time + 7s for attachAlarmInterrupt,  41s for creatAlarm
          rtclock.setAlarmTime(mtt);
          AlarmExchange = 0;
          break;
      }
    }
  }
  if (tt1 != tt && dispflag == true )
  {
    tt1 = tt;
    // get and print actual RTC timestamp
    rtclock.breakTime(rtclock.now(), mtt);
    sprintf(s, "RTC timestamp: %s %u %u, %s, %02u:%02u:%02u\n",
      months[mtt.month], mtt.day, mtt.year+1970, weekdays[mtt.weekday], mtt.hour, mtt.minute, mtt.second);
    Serial.print(s);
  }
}

完全粘贴源码文章,笔记。