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fix: no flash writes while typing, and a clock that survives a power loss

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Contacts and paths are saved a while after the change and never while the
user is active, so a send no longer stutters on the 53 KB contact rewrite
(a path that came back unchanged isn't written at all). The clock is saved
every 30 minutes and restored no earlier than the firmware's build day.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-10-08 23:41:32 +02:00
co-authored by Claude Opus 5.5
parent aaf35351d7
commit 9ef7d5d981
5 changed files with 70 additions and 17 deletions
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examples/companion_radio/DataStore.cpp
+33 -12
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@@ -489,24 +489,45 @@ void DataStore::saveRTCTime() {
}
}
// The day this firmware was built (__DATE__, "Mmm dd yyyy"), 00:00 UTC: the
// clock can't be any earlier than that.
static uint32_t buildDayEpoch() {
static const char M[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
const char* d = __DATE__;
int m = 1;
while (m <= 12 && strncmp(M + 3 * (m - 1), d, 3) != 0) m++;
int day = atoi(d + 4), y = atoi(d + 7);
if (m > 12 || day < 1 || y < 2024) return 0;
y -= m <= 2; // days from 1970-01-01 (H. Hinnant's days_from_civil)
int era = y / 400, yoe = y - era * 400;
int doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + day - 1;
int doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
return (uint32_t)(era * 146097 + doe - 719468) * 86400UL;
}
void DataStore::restoreRTCTime() {
File file = openRead(_fs, "/rtc_save");
uint32_t t = 0;
if (file) {
uint32_t t = 0;
file.read((uint8_t *)&t, sizeof(t));
file.close();
#ifndef SIM_PLATFORM
// Real hardware has no other way to know the time before a GPS fix or
// a phone/CLI sync, so restoring the last-known saved time is the
// right call there. The sim's RTCClock (SimRTCClock.h) is already
// backed by the real host wall clock (time(NULL)) from the moment it's
// constructed -- overwriting that with a stale save from a previous
// visit (persisted via IDBFS, see the site's "returning visitor" note)
// would make a returning instance's on-screen clock drift away from
// the visitor's own real time instead of just showing it.
if (t > 1000000000UL) _clock->setCurrentTime(t);
#endif
}
// Saved at power-off and every half hour (MyMesh::loop()); a flash or a
// reset in between can leave it far behind -- never earlier than the build.
uint32_t built = buildDayEpoch();
if (t < built) t = built;
#ifndef SIM_PLATFORM
// Real hardware has no other way to know the time before a GPS fix or
// a phone/CLI sync, so restoring the last-known saved time is the
// right call there. The sim's RTCClock (SimRTCClock.h) is already
// backed by the real host wall clock (time(NULL)) from the moment it's
// constructed -- overwriting that with a stale save from a previous
// visit (persisted via IDBFS, see the site's "returning visitor" note)
// would make a returning instance's on-screen clock drift away from
// the visitor's own real time instead of just showing it.
// Only ever forward: a board with its own RTC chip may already know better.
if (t > 1000000000UL && t > _clock->getCurrentTime()) _clock->setCurrentTime(t);
#endif
}
void DataStore::loadContacts(DataStoreHost* host) {