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Add GPS support Heltec Wireless Tracker v1.x

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Pin mapping verified against HTIT-Tracker V0.5 schematic:
- GPIO35 (GPS_EN): N-ch MOSFET drives P-ch high-side switch, active HIGH
- GPIO36 (GPS_RST): hardware reset, active LOW
- GPIO33/34: UART TX/RX

Delegates power management to MicroNMEALocationProvider begin()/stop()
which independently controls GPS power via GPS_EN and shares VEXT with
the display through RefCountedDigitalPin.
This commit is contained in:
Wessel Nieboer 2026-01-09 05:06:17 +01:00 • committed by Wessel Nieboer
parent 06ab9f7f6b
commit 59d9770ab9
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GPG key ID: 27BB1C3D63DEEFFF
3 changed files with 11 additions and 6 deletions
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11
variants/heltec_tracker/target.cpp
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@ -16,7 +16,8 @@ WRAPPER_CLASS radio_driver(radio, board);
ESP32RTCClock fallback_clock;
AutoDiscoverRTCClock rtc_clock(fallback_clock);
MicroNMEALocationProvider nmea = MicroNMEALocationProvider(Serial1);
// GPS_EN (GPIO35) drives N-ch MOSFET → P-ch high-side switch; GPS_RESET (GPIO36) active LOW
MicroNMEALocationProvider nmea = MicroNMEALocationProvider(Serial1, &rtc_clock, GPS_RESET, GPS_EN, &board.periph_power);
HWTSensorManager sensors = HWTSensorManager(nmea);
#ifdef DISPLAY_CLASS
@ -58,18 +59,16 @@ mesh::LocalIdentity radio_new_identity() {
void HWTSensorManager::start_gps() {
if (!gps_active) {
board.periph_power.claim();
_location->begin(); // Claims periph_power via RefCountedDigitalPin
gps_active = true;
Serial1.println("$CFGSYS,h35155*68");
Serial1.println("$CFGSYS,h35155*68"); // Configure GPS for all constellations
}
}
void HWTSensorManager::stop_gps() {
if (gps_active) {
gps_active = false;
board.periph_power.release();
_location->stop(); // Releases periph_power via RefCountedDigitalPin
}
}