Pieter ViljoenandClaude Opus 5.5 26217825b3 rtc: write the RX8130CE and YSN8900 weekday one-hot ...

rtc_time_block() wrote the weekday as a number 0-6 (Sunday 0) for every
RTC. The RX8130CE's WEEK register (13h) is one-hot: Epson ETM50E-10
14.1.2, Table 15, p. 27, Sunday 01h to Saturday 40h, with no more than
one bit set. So each sync wrote Sunday as no day, Monday as Sunday, and
Wednesday, Friday and Saturday as two days at once. ZephCore never
reads the weekday back, so its time and date were unaffected.

A new boolean descriptor property, weekday-one-hot, is set on the
RX8130CE node in rtc-i2c.dtsi, and rtc_time_block() writes BIT(dow)
where it is set. That is the encoding of Zephyr's rtc_rx8130ce.c. The
DS3231, PCF8563 and RV3028 keep 0-6, as Zephyr's drivers for them
write it. The binding and comments no longer call the whole block BCD.

meshtracker_x1's YSN8900 sets it too. The board already uses the RX8900
register map for it, and the RX8900's WEEK register (03h) is one-hot:
Epson ETM45E-11 8.2.2, Table 15, p. 16. The YSN8900's own data sheet
has no register map, and its programming guide is not available.

The same defect and fix as meshcore-dev/MeshCore#3550.

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

2026-10-05 12:35:32 -07:00

..

zephcore,rtc-i2c.yaml

rtc: write the RX8130CE and YSN8900 weekday one-hot

2026-10-05 12:35:32 -07:00