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docs: note SIM868 RTC set via AT+CCLK (BUG-18 follow-up)

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Mathieu Moran
2026-08-14 19:03:09 -04:00
parent dc3a3d866d
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@@ -2276,8 +2276,10 @@ logged as `BUG-XX` entries in [BUGS.md](./BUGS.md) (BUG-16 onward) and fixed + v
DS3231 install; historical trips 25136/25137 keep their bad data, future trips will be correct.
- **BUG-18 (no RTC) — ✅ FIXED**: DS3231 on I²C (`0x68`) + CR2032 (charge diode removed), config
(`dtparam=i2c_arm=on` + `dtoverlay=i2c-rtc,ds3231`), `fake-hwclock` disabled, `i2c-dev`
persisted. Power-cycle test passed — boots with correct time from RTC. SIM868 CR1220 also
installed (secondary). Optional follow-up: `AT+CCLK` boot-time clock fallback in `app_gps.py`.
persisted. Power-cycle test passed — boots with correct time from RTC (stable oscillator, no
`SET TIME!`). SIM868 CR1220 installed + its RTC set via `AT+CCLK` (was 2004 default); hold
across power-off to confirm on next cycle. Optional follow-up: `AT+CCLK` boot-time clock
fallback in `app_gps.py`.
Open items from the drive — fill in as reported:
- (none clock-related — BUG-17/BUG-18 closed 2026-08-14).