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Hold for >20s after GPS lock

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GPS chips are designed to stay locked for a while to download some data and save it.
This data is important for speeding up future locks, and making them higher quality.
Our present configuration could make every lock perform similar to first lock.

This patch sets a hold of between 20s and 10% of the lock search time after lock
is acquired. This should allow the GPS to finish its work before we turn it off.

Fixes https://github.com/meshtastic/firmware/issues/7466
This commit is contained in:
Tom Fifield 2025-09-01 08:34:54 +10:00
parent 67e3a17b28
commit 7d745ec408
No known key found for this signature in database
2 changed files with 11 additions and 4 deletions
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13
src/gps/GPS.cpp
View File

@ -1126,6 +1126,10 @@ int32_t GPS::runOnce()
LOG_DEBUG("hasValidLocation RISING EDGE");
hasValidLocation = true;
shouldPublish = true;
lastFixStartMsec = millis();
// Calculate hold duration: 10% of search time or 20s, whichever is smaller
uint32_t tenPercent = scheduling.elapsedSearchMs() / 10;
fixHoldEnds = lastFixStartMsec + ((tenPercent < 20000) ? tenPercent : 20000);
}
bool tooLong = scheduling.searchedTooLong();
@ -1135,7 +1139,7 @@ int32_t GPS::runOnce()
// Once we get a location we no longer desperately want an update
if ((gotLoc && gotTime) || tooLong) {
if (tooLong) {
if (tooLong && !gotLoc) {
// we didn't get a location during this ack window, therefore declare loss of lock
if (hasValidLocation) {
LOG_DEBUG("hasValidLocation FALLING EDGE");
@ -1143,8 +1147,11 @@ int32_t GPS::runOnce()
p = meshtastic_Position_init_default;
hasValidLocation = false;
}
down();
if (millis() > fixHoldEnds) {
down();
} else {
LOG_DEBUG("Holding for GPS data download: %d ms", fixHoldEnds - millis());
}
shouldPublish = true; // publish our update for this just finished acquisition window
}

2
src/gps/GPS.h
View File

@ -159,7 +159,7 @@ class GPS : private concurrency::OSThread
uint8_t fixType = 0; // fix type from GPGSA
#endif
uint32_t lastWakeStartMsec = 0, lastSleepStartMsec = 0, lastFixStartMsec = 0;
uint32_t lastFixStartMsec = 0, fixHoldEnds = 0;
uint32_t rx_gpio = 0;
uint32_t tx_gpio = 0;