1) The INT pin works fine when I tested the DS3231 in a blank project(i.e it is active high and goes low when an alarm is generated), but behaves weirdly when I put it in the LoRa project in place of the internal timer code which is it either stays still or goes toggles whenever the alarm is generated. I've modified and added my external RTC set alarm (which might definitely not be right) and without interrupt I polled for the alarm with every 10th sec alarm match. To make sure I know that an alarm was generated I made the alarm event to toggle an external LED which it does correctly every minute (LoRa interval is 60 sec). The weird thing is the alarm is not set at the 10th sec but is really random all the time which means the alarm is not triggering the LoRa transmission but the internal RTC is. If my external LED alarm event happens every minute accurately and even if I set the external alarm to a particular minute meaning an alarm every hour it transmits the data every minute with alarm triggering every minute. For sure I have not correctly replaced all the internal util timer code in lora_app.c. I would like to know which lines I need to exactly replace.
2) External RTC with battery backup provision would run incase of a power cut but since we have no plans for a separate external battery for the line powered MCU so internal RTC just stops running incase of a power cut. The internal RTC does not allow me to configure it to any BCD mode (else the program breaks all together) which makes it possible for me to set alarms at exact seconds every minute or exact minutes every hour so that the different devices for my application don't collide during transmission.
