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Hold GC1109 PA_POWER during deep sleep for LNA RX wake

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The GC1109 FEM needs its VFEM_Ctrl pin held HIGH during deep sleep
to keep the LNA active, enabling proper RX sensitivity for
wake-on-packet. Without this, the LNA is unpowered during sleep
and RX wake sensitivity is degraded by ~17dB.

Release RTC holds in begin() after configuring GPIO registers
(not before) to ensure glitch-free pin transitions on wake.

Trade-off: ~6.5mA additional sleep current for significantly
improved wake-on-packet range.
This commit is contained in:
Wessel Nieboer 2026-02-06 01:57:27 +01:00 • committed by Wessel Nieboer
parent 06ab9f7f6b
commit 329e408197
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GPG key ID: 27BB1C3D63DEEFFF
3 changed files with 23 additions and 9 deletions
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11
variants/heltec_tracker_v2/HeltecTrackerV2Board.cpp
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@ -6,12 +6,17 @@ void HeltecTrackerV2Board::begin() {
pinMode(PIN_ADC_CTRL, OUTPUT);
digitalWrite(PIN_ADC_CTRL, LOW); // Initially inactive
// Set up digital GPIO registers before releasing RTC hold. The hold latches
// the pad state including function select, so register writes accumulate
// without affecting the pad. On hold release, all changes apply atomically
// (IO MUX switches to digital GPIO with output already HIGH — no glitch).
pinMode(P_LORA_PA_POWER, OUTPUT);
digitalWrite(P_LORA_PA_POWER,HIGH);
rtc_gpio_hold_dis((gpio_num_t)P_LORA_PA_POWER);
rtc_gpio_hold_dis((gpio_num_t)P_LORA_PA_EN);
pinMode(P_LORA_PA_EN, OUTPUT);
digitalWrite(P_LORA_PA_EN,HIGH);
rtc_gpio_hold_dis((gpio_num_t)P_LORA_PA_EN);
pinMode(P_LORA_PA_TX_EN, OUTPUT);
digitalWrite(P_LORA_PA_TX_EN,LOW);
@ -48,7 +53,9 @@ void HeltecTrackerV2Board::begin() {
rtc_gpio_hold_en((gpio_num_t)P_LORA_NSS);
rtc_gpio_hold_en((gpio_num_t)P_LORA_PA_EN); //It also needs to be enabled in receive mode
// Hold GC1109 FEM pins during sleep to keep LNA active for RX wake
rtc_gpio_hold_en((gpio_num_t)P_LORA_PA_POWER);
rtc_gpio_hold_en((gpio_num_t)P_LORA_PA_EN);
if (pin_wake_btn < 0) {
esp_sleep_enable_ext1_wakeup( (1L << P_LORA_DIO_1), ESP_EXT1_WAKEUP_ANY_HIGH); // wake up on: recv LoRa packet