STM32WB LPSLEEP issue

[MHast.1]

Hello, I'm trying to implement Low power sleep on STM32WB. The sequence is as per LPSLEEP example:

HAL_PWREx_EnableFlashPowerDown(PWR_FLASHPD_LPSLEEP);
SystemClock_Decrease(); //MSI 2MHZ
HAL_SuspendTick();
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
//... Sleep until wake on interrupt (EXTI15_10_IRQn)

In my case CPU1 never sleeps, or it wakes straight away. I've tried disabling the other interrupts with HAL_NVIC_DisableIRQ(), __disable_irq(), no success.

What could be causing it? CPU2 and BLE stack are running, what needs to be done on this side? Thanks

[Mahmoud Ben Romdhane]

Hello @MHast.11.

Thank you for posting.

I suggest that you consult this PDF AN5071 which describes the Power Modes features of the STM32WB Series.

You can also take a look to the examples available under https://rb.gy/nw2hb .

Thank you.

Mahmoud.