I use STM32WL RTC Alarm as low power mode timer for achieve ms level accrancy and any duration sleep. System will convert sleep time to Alarm time before enter low power mode. I have tested different  sleep time, verified convertion result is correct...

STM32WL lorawan middleware use a RTC subsecond underflow interrupt update tick instead systick，but the subsecond underflow interrupt never entered.It seems interrupt not enabled, so I manually enable RTC subsecond underflow interrupt but the handler ...