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Merge pull request #1600 from weebl2000/heltec_deep_sleep_lna

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Hold GC1109 PA_POWER during deep sleep for LNA RX wake
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Liam Cottle 2026-03-03 23:20:22 +13:00 • committed by GitHub
commit 67779aded8
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GPG key ID: B5690EEEBB952194
3 changed files with 32 additions and 13 deletions
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18
variants/heltec_tracker_v2/HeltecTrackerV2Board.cpp
View file

@ -6,18 +6,26 @@ 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);
periph_power.begin();
esp_reset_reason_t reason = esp_reset_reason();
if (reason != ESP_RST_DEEPSLEEP) {
delay(1); // GC1109 startup time after cold power-on
}
periph_power.begin();
if (reason == ESP_RST_DEEPSLEEP) {
long wakeup_source = esp_sleep_get_ext1_wakeup_status();
if (wakeup_source & (1 << P_LORA_DIO_1)) { // received a LoRa packet (while in deep sleep)
@ -48,7 +56,9 @@ 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

10
variants/heltec_tracker_v2/platformio.ini
View file

@ -17,11 +17,11 @@ build_flags =
-D P_LORA_SCLK=9
-D P_LORA_MISO=11
-D P_LORA_MOSI=10
-D P_LORA_PA_POWER=7 ;power en
-D P_LORA_PA_EN=4
-D P_LORA_PA_TX_EN=46 ;enable tx
-D LORA_TX_POWER=10 ;If it is configured as 10 here, the final output will be 22 dbm.
-D MAX_LORA_TX_POWER=22 ;Max SX1262 output
-D P_LORA_PA_POWER=7 ; VFEM_Ctrl - GC1109 LDO power enable
-D P_LORA_PA_EN=4 ; CSD - GC1109 chip enable (HIGH=on)
-D P_LORA_PA_TX_EN=46 ; CPS - GC1109 PA mode (HIGH=full PA, LOW=bypass)
-D LORA_TX_POWER=10 ; 10dBm + ~11dB GC1109 gain = ~21dBm output
-D MAX_LORA_TX_POWER=22 ; Max SX1262 output -> ~28dBm at antenna
-D SX126X_DIO2_AS_RF_SWITCH=true
-D SX126X_DIO3_TCXO_VOLTAGE=1.8
-D SX126X_CURRENT_LIMIT=140

17
variants/heltec_v4/HeltecV4Board.cpp
View file

@ -7,19 +7,26 @@ void HeltecV4Board::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);
esp_reset_reason_t reason = esp_reset_reason();
if (reason != ESP_RST_DEEPSLEEP) {
delay(1); // GC1109 startup time after cold power-on
}
periph_power.begin();
esp_reset_reason_t reason = esp_reset_reason();
if (reason == ESP_RST_DEEPSLEEP) {
long wakeup_source = esp_sleep_get_ext1_wakeup_status();
if (wakeup_source & (1 << P_LORA_DIO_1)) { // received a LoRa packet (while in deep sleep)
@ -50,7 +57,9 @@ void HeltecV4Board::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