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stm32wl(rak3172): implement cpuDeepSleep()/shutdown() via STM32LowPower #10993

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Merged
thebentern merged 2 commits into from
Jul 17, 2026
+33 −2
Merged

stm32wl(rak3172): implement cpuDeepSleep()/shutdown() via STM32LowPower #10993

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61cc764
stm32wl(rak3172): implement cpuDeepSleep()/shutdown() via STM32LowPower
ndoo Jul 11, 2026
01297c7
feat(stm32wl): Warn and reset when trying to deepSleep without RTC
ndoo Jul 11, 2026
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2 changes: 1 addition & 1 deletion src/Power.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -906,7 +906,7 @@ void Power::shutdown()
#if HAS_SCREEN
messageStore.saveToFlash();
#endif
#if defined(ARCH_NRF52) || defined(ARCH_ESP32) || defined(ARCH_RP2040)
#if defined(ARCH_NRF52) || defined(ARCH_ESP32) || defined(ARCH_RP2040) || defined(ARCH_STM32WL)
#ifdef PIN_LED1
ledOff(PIN_LED1);
#endif
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31 changes: 30 additions & 1 deletion src/platform/stm32wl/main-stm32wl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
#include <stm32wlxx_hal.h>

#if HAS_LSE
#include <STM32LowPower.h>
#include <STM32RTC.h>

// LSEDRV is a 2-bit RCC_BDCR field where every combination is a legal drive level, so this covers all 4 values.
Expand Down Expand Up @@ -120,6 +121,7 @@ void stm32wlSetup()
rtc.setClockSource(STM32RTC::LSE_CLOCK);
rtc.begin();
stm32wlRtcValid = true;
LowPower.begin();
LOG_INFO("STM32WL: LSE locked, hardware RTC available");
} else {
// Don't leave a failed oscillator burning current.
Expand All @@ -138,7 +140,34 @@ bool stm32wlRtcAvailable()
void stm32wlSetup() {}
#endif

void cpuDeepSleep(uint32_t msecToWake) {}
void cpuDeepSleep(uint32_t msecToWake)
{
#if HAS_LSE
if (!stm32wlRtcAvailable()) {
// Hardware can't shutdown, but firmware has already prepared itself for shutdown
// Do not leave the device unresponsive, reset instead
LOG_WARN("STM32WL: hardware RTC failed, cannot deep sleep/shutdown");
if (Serial) {
Serial.flush();
Serial.end();
}
HAL_NVIC_SystemReset();
}

if (Serial) {
Serial.flush();
Serial.end();
}

if (msecToWake != portMAX_DELAY) {
LowPower.shutdown(msecToWake);
} else {
LowPower.shutdown();
}
// RTC wakes from shutdown into MCU reset, so this code should never be reached
HAL_NVIC_SystemReset();
#endif
}

// Hacks to force more code and data out.

Expand Down
2 changes: 2 additions & 0 deletions variants/stm32/rak3172/platformio.ini
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Expand Up @@ -20,5 +20,7 @@ lib_deps =
${stm32_base.lib_deps}
# renovate: datasource=github-tags depName=STM32RTC packageName=stm32duino/STM32RTC
https://github.com/stm32duino/STM32RTC/archive/refs/tags/1.9.0.zip
# renovate: datasource=github-tags depName=STM32LowPower packageName=stm32duino/STM32LowPower
https://github.com/stm32duino/STM32LowPower/archive/refs/tags/1.5.0.zip

upload_port = stlink
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