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Fix GPS that hard code 2080 as the start time. (#7803)

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* Fix GPS that hard code 2080 as the start time.

Some GPS chips, such as the AG3335 in T1000e and L96 have a hardcoded
time of 2080-01-05 when they start up.

To fix that in a way that seems permanent, let's ignore times that
are more than 40 years since the firmware was built. We should followup
in late 2039 to see if any changes are needed.

Reported-By: @b8b8

* Update src/gps/RTC.cpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Put FORTY_YEARS in header and use in both places.

* Restore Ben's nicer log lines.

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Tom Fifield 2025-09-02 21:40:59 +10:00 committed by Ben Meadors
parent 3b82d55176
commit 3040e5a7bb
2 changed files with 11 additions and 0 deletions
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8
src/gps/RTC.cpp
View File

@ -132,6 +132,10 @@ RTCSetResult perhapsSetRTC(RTCQuality q, const struct timeval *tv, bool forceUpd
if (tv->tv_sec < BUILD_EPOCH) {
LOG_WARN("Ignore time (%ld) before build epoch (%ld)!", printableEpoch, BUILD_EPOCH);
return RTCSetResultInvalidTime;
} else if (tv->tv_sec > (BUILD_EPOCH + FORTY_YEARS)) {
LOG_WARN("Ignore time (%ld) too far in the future (build epoch: %ld, max allowed: %ld)!", printableEpoch, BUILD_EPOCH,
BUILD_EPOCH + FORTY_YEARS);
return RTCSetResultInvalidTime;
}
#endif
@ -250,6 +254,10 @@ RTCSetResult perhapsSetRTC(RTCQuality q, struct tm &t)
if (tv.tv_sec < BUILD_EPOCH) {
LOG_WARN("Ignore time (%ld) before build epoch (%ld)!", printableEpoch, BUILD_EPOCH);
return RTCSetResultInvalidTime;
} else if (tv.tv_sec > (BUILD_EPOCH + FORTY_YEARS)) {
LOG_WARN("Ignore time (%ld) too far in the future (build epoch: %ld, max allowed: %ld)!", printableEpoch, BUILD_EPOCH,
BUILD_EPOCH + FORTY_YEARS);
return RTCSetResultInvalidTime;
}
#endif

3
src/gps/RTC.h
View File

@ -55,3 +55,6 @@ time_t gm_mktime(struct tm *tm);
#define SEC_PER_DAY 86400
#define SEC_PER_HOUR 3600
#define SEC_PER_MIN 60
#ifdef BUILD_EPOCH
#define FORTY_YEARS (40UL * 365 * SEC_PER_DAY) // probably time to update your firmware
#endif