I am using STM32WB55 and entering STOP2 mode for low-power operation.
RTC Wakeup timer is configured, and the interrupt works correctly in RUN mode,
but the MCU does not wake up from STOP2 mode when the RTC wakeup interrupt is expected.
Configuration:
- RTC enabled using LSE
- Wakeup timer configured with WUT
- MX generated code + custom low power entry
- NVIC enabled for RTC Wakeup
Tried:
- Ensured RTC interrupt flag is cleared before entering STOP2
- Enabled DBG and checked if STOP2 entry works
- Checked PWR->WUPEN / PWR_SCR flags
Still, the MCU does not wake when RTC WUT expires.
Any suggestions or known STM32WB55 issues related to STOP2 + RTC Wakeup?
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