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Pieter ViljoenandClaude Opus 5.5
db69172c66
ZephCore assumed 24-hour mode. If other firmware had left an RV3028 in 12-hour mode, the boot read masked the hours with 0x3F and could restore a time up to twelve hours off, and each save's 24-hour hours byte meant a different hour to the chip. A new optional twelve-hour-bit = [register mask] names the bit, set on the two RV3028 nodes to Control 2 12_24. Once the chip is cleanly identified at boot, rtc_probe() clears a set bit and re-reads the time block; the chip converts its own hours, as MeshCore relies on. If the register cannot be read, reads FFh, or the clear or re-read fails, no time is taken from the chip. DS3231/DS1307 are unchanged: a save's hours byte already selects 24-hour mode there. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>