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Fix Heltec V4-R8 waking from hibernate on LoRa traffic #3168

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Fix Heltec V4-R8 waking from hibernate on LoRa traffic #3168

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12 changes: 11 additions & 1 deletion variants/heltec_v4_r8/HeltecV4R8Board.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,17 @@ void HeltecV4R8Board::enterDeepSleep(uint32_t secs, int pin_wake_btn) {
}

void HeltecV4R8Board::powerOff() {
enterDeepSleep(0);
// enterDeepSleep() is wake-on-LoRa: it keeps the FEM in RX and arms DIO1
// as an EXT1 wakeup source, so with the radio still running any received
// packet boots the device again. Hibernate needs the FEM off (latched
// through deep sleep; init() releases the holds on the next boot) and the
// base behaviour: radio put to sleep, no wakeup sources armed.
loRaFEMControl.setSleepModeEnable();
digitalWrite(P_LORA_PA_POWER, LOW);
rtc_gpio_hold_en((gpio_num_t)P_LORA_KCT8103L_PA_CSD);
rtc_gpio_hold_en((gpio_num_t)P_LORA_PA_POWER);

ESP32Board::enterDeepSleep(0);
}

uint16_t HeltecV4R8Board::getBattMilliVolts() {
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