Shutdown not works form STM32LowPower library

[funnypinky]

Hey,
I'm currently testing the shutdown method from the STM32LowPower library. But it doesn't seem to be working correctly, because after a short interval of about 5 seconds, the board reboots. I've tried TimedWakeup and binTimedWakeup, so I replaced deepSleep with shutdown. But it doesn't work. I'm using the Lora E5 mini board.

static uint32_t atime = 120000; static uint32_t time_ts;

void alarmMatch(void* data) {
  // This function will be called once on device wakeup
  // You can do some little operations here (like changing variables which will be used in the loop)
  // Remember to avoid calling delay() and long running functions since this functions executes in interrupt context
  uint32_t _millis = 1000;

  if (data != NULL) {
    _millis = *(uint32_t*)data;
  }

  rtc.getEpoch(&time_ts);
  rtc.setAlarmEpoch(0, STM32RTC::MATCH_SUBSEC, (time_ts + _millis), STM32RTC::ALARM_A);
}

 // Configure low power
  LowPower.begin();
  LowPower.enableWakeupFrom(&rtc, alarmMatch, &atime);

  rtc.getEpoch(&time_ts);

  // Configure first alarm in 2 seconds then it will be done in the rtc callback
  rtc.setAlarmEpoch(0, STM32RTC::MATCH_SUBSEC, (time_ts + 2000), STM32RTC::ALARM_A);

  LowPower.shutdown(); 

I'm not sure if I'm making a mistake in how I'm using it.

Thanks a lot,
Funnypinky

[fpistm]

Shutdown reset the board . Then you have some time to Boots.

[funnypinky]

I have modify my program to test the idle and sleep methods. This two methods work fine, so i have a sleeptime of 120 seconds. When I use deepSleep or shutdown the mcu wake up every 5 seconds.

Here my modify code:

Thats work fine:

void loop()
{
  send_packet();
  LowPower.sleep(atime);
}

Thats work not fine:

void loop()
{
  send_packet();
  LowPower.deepSleep(atime);
}