Wake from sleep not working on LE10.0.1

Hi,

I got LE 9.2 to wake a Raspberry Pi 2 from halt for a TVHeadEnd recording using this circuit with a DS3231 RTC module: Circuit to wake Raspberry Pi from halt for a recording using DS3231 RTC

Updated to a Raspberry Pi 4 with LE10.0.1 and this no-longer works. It does correctly set the alrm_time and alrm_date to just before the recording, but doesn't enable the alarm, by not setting "alarm_IRQ : yes".

Output from cat /proc/driver/rtc

rtc_time : 13:14:14

rtc_date : 2022-02-06

alrm_time : 15:11:00

alrm_date : 2022-02-06

alarm_IRQ : no

alrm_pending : no

update IRQ enabled : no

periodic IRQ enabled : no

periodic IRQ frequency : 1

max user IRQ frequency : 64

Any ideas please?

-Ian

Thanks chewitt.

Also LE9.2 would set the system time from hardware RTC on boot-up. LE10.0.1 doesn't on this setup.

In the DS3231 control register byte 0Eh bit INTCN is correctly set, but bit A1IE clear. They should both be set to enable the alarm.