wakup from sleep on falling edge

[hybridA]

I want to wakeup from deep sleep after 30seconds and on a falling edge of an input.
Here's the code that puts the MCU to sleep, as found here:

Code: Select all

    wakeupspec.wutr = ((uint32_t)4) << 16;
    wakeupspec.wutr |= 29;
    rtcSTM32SetPeriodicWakeup(&RTCD1, &wakeupspec);
    chSysLock();
    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
    PWR->CR  |= (PWR_CR_PDDS | PWR_CR_LPDS | PWR_CR_CSBF | PWR_CR_CWUF);
    RTC->ISR &= ~(RTC_ISR_ALRBF | RTC_ISR_ALRAF | RTC_ISR_WUTF | RTC_ISR_TAMP1F |
                    RTC_ISR_TSOVF | RTC_ISR_TSF);
    __enable_irq();
    __WFI();

This works OK, as in waking up every 30 seconds.
Additionally I would want to wake up whenever PC13 is falling.

I tried using palEnablePadEvent(), but that didn't' work. Is there a hal wrapper, or does this have to be done on a register level?

[Giovanni]

Hi,

That PAL function enables "PAL events" (callbacks), not the EXTI events you need for wakeup. Try at register level, most of your code is done that way already.

Giovanni