RTClibExtended, DS3231 and Arduino M0 Pro

I’m trying to use a DS3231 RTC module to wake up an Arduino M0 Pro at certain times but cannot get the chip alarms working (no interrupt signal ever gets output). It seems that none of the DS3231 libraries will work with the M0 pro, has anyone got the two working together?

Matt

rtc_v3.ino (5.11 KB)

Please post a wiring diagram!