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Add STM32U0 RTC support for sleep (extends #1586) (#1592)

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The STM32U0 series uses ICSR instead of ISR for the RTC initialization status register, and has a combined RTC_TAMP_IRQn instead of a separate RTC_WKUP_IRQn. Add a dedicated init block so sleep/wakeup works correctly on this family.

Co-authored-by: Nicolas Schurando <nicolas@schurando.fr>
This commit is contained in:
Nicolas Schurando
2026-02-15 20:51:11 +01:00
committed by GitHub
parent dd12875b37
commit c456570875
1 changed files with 75 additions and 0 deletions
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75
hal/architecture/STM32/MyHwSTM32.cpp
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@@ -485,6 +485,40 @@ static bool hwSleepInit(void)
HAL_NVIC_SetPriority(RTC_Alarm_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn);
#elif defined(STM32U0xx)
// ============================================================
// STM32U0: Modern RTC with ICSR register (instead of ISR)
// ============================================================
// Similar to other modern STM32 families but with renamed registers
// and combined RTC/TAMP interrupt vector
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
if (useLSE) {
hrtc.Init.AsynchPrediv = 127; // 128
hrtc.Init.SynchPrediv = 255; // 256, total = 32768
} else {
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 249; // Adjusted for typical ~32 kHz LSI
}
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
// Check if RTC is already initialized (avoid reinit conflicts with SPI etc.)
if ((RTC->ICSR & RTC_ICSR_INITS) == 0) {
if (HAL_RTC_Init(&hrtc) != HAL_OK) {
return false;
}
} else {
hrtc.State = HAL_RTC_STATE_READY;
}
// Configure interrupt for RTC wake_up timer
HAL_NVIC_SetPriority(RTC_TAMP_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(RTC_TAMP_IRQn);
#else
// ============================================================
// STM32F2/F3/F4/F7/L1/L4/L5/G0/G4/H7: Modern RTC
@@ -574,6 +608,41 @@ static bool hwSleepConfigureTimer(uint32_t ms)
// Enable alarm interrupt in RTC
RTC->CRH |= RTC_CRH_ALRIE;
#elif defined(STM32U0xx)
// ============================================================
// STM32U0: Use wake-up timer
// ============================================================
// STM32U0 HAL requires a 4th argument: WakeUpAutoClr (auto-clear of wakeup flag)
uint32_t wakeUpCounter;
uint32_t wakeUpClock;
if (ms <= 32000) {
// Up to 32 seconds: use RTCCLK/16 (2048 Hz, ~0.49 ms resolution)
wakeUpClock = RTC_WAKEUPCLOCK_RTCCLK_DIV16;
wakeUpCounter = (ms << 11) / 1000; // ms * 2048 / 1000
if (wakeUpCounter < 2) {
wakeUpCounter = 2;
}
if (wakeUpCounter > 0xFFFF) {
wakeUpCounter = 0xFFFF;
}
} else {
// Over 32 seconds: use CK_SPRE (1 Hz, 1 second resolution)
wakeUpClock = RTC_WAKEUPCLOCK_CK_SPRE_16BITS;
wakeUpCounter = ms / 1000;
if (wakeUpCounter == 0) {
wakeUpCounter = 1;
}
if (wakeUpCounter > 0xFFFF) {
wakeUpCounter = 0xFFFF; // Max ~18 hours
}
}
if (HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, wakeUpCounter, wakeUpClock, 0) != HAL_OK) {
return false;
}
#else
// ============================================================
// STM32F2/F3/F4/F7/L1/L4/L5/G0/G4/H7: Use wake-up timer
@@ -649,6 +718,12 @@ extern "C" void RTC_Alarm_IRQHandler(void)
EXTI->PR = EXTI_PR_PR17; // Clear EXTI line 17 pending
RTC->CRL &= ~RTC_CRL_ALRF; // Clear RTC alarm flag
}
#elif defined(STM32U0xx)
// STM32U0: Combined RTC/TAMP interrupt (no separate RTC_WKUP vector)
extern "C" void RTC_TAMP_IRQHandler(void)
{
HAL_RTCEx_WakeUpTimerIRQHandler(&hrtc);
}
#else
extern "C" void RTC_WKUP_IRQHandler(void)
{