BlackMarkandClaude Opus 5.5 4df536d0a5 fix: an alarm clear keeps the other alarm's flag, and arming keeps BBSQW ...

A1F and A2F ignore a written 1, so the status write-back now writes the
flag not being cleared as 1: an alarm firing between the read and the
write was cleared with the other. BBSQW gates the alarm interrupt on
battery as well as the square wave (19-5170 rev. 4), so arming an alarm
no longer clears it. Both register computations are consteval-tested.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-23 21:42:32 +02:00

..

ds3231

fix: an alarm clear keeps the other alarm's flag, and arming keeps BBSQW

2026-10-23 21:42:32 +02:00