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fix wake lockup and bus stall #46

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fix wake lockup and bus stall #46

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ca05658
fix wake lockup and bus stall
sslupsky May 23, 2019
1381b18
fix formatting
sslupsky May 24, 2019
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19 changes: 17 additions & 2 deletions src/RTCZero.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -147,9 +147,13 @@ void RTCZero::standbyMode()
{
// Entering standby mode when connected
// via the native USB port causes issues.
// Disable systick interrupt: See https://www.avrfreaks.net/forum/samd21-samd21e16b-sporadically-locks-and-does-not-wake-standby-sleep-mode
SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk;
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
__DSB();
__WFI();
// Enable systick interrupt
SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk;
}

/*
Expand Down Expand Up @@ -405,9 +409,20 @@ void RTCZero::setAlarmEpoch(uint32_t ts)

time_t t = ts;
struct tm* tmp = gmtime(&t);
RTC_MODE2_CLOCK_Type alarmTime;

alarmTime.bit.YEAR = tmp->tm_year - EPOCH_TIME_YEAR_OFF;
alarmTime.bit.MONTH = tmp->tm_mon + 1;
alarmTime.bit.DAY = tmp->tm_mday;
alarmTime.bit.HOUR = tmp->tm_hour;
alarmTime.bit.MINUTE = tmp->tm_min;
alarmTime.bit.SECOND = tmp->tm_sec;

RTC->MODE2.Mode2Alarm[0].ALARM.reg = alarmTime.reg;

while (RTCisSyncing())
;

setAlarmDate(tmp->tm_mday, tmp->tm_mon + 1, tmp->tm_year - EPOCH_TIME_YEAR_OFF);
setAlarmTime(tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
}
}

Expand Down