stm32H73** sleep mode

[harareyd]

Hi, 

My test board can enter sleep mode OK, but doesn't wake up when PC13 goes high: (never reach __enable_irq())

void Sleep() {
__disable_irq();

SysTick->CTRL = 0;

// Enable WKUP4 (PC13)
PWR->WKUPEPR = PWR_WKUPEPR_WKUPEN4; // Enable WKUP4
PWR->WKUPCR = 0xFFFFFFFF; // Clear all wake-up flags

SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
PWR->CR1 |= PWR_CR1_LPDS; // Low Power Deep Sleep

__DSB();
__ISB();
__WFI(); // Enter deep sleep

__enable_irq();
}

[Sarra.S]

Hello @harareyd, welcome to the ST community,

Consider using __WFE() instead of __WFI() to enter sleep mode. The __WFE() instruction can be more suitable for event-driven wake-up scenarios.

But your code is correct... maybe the issue is with the physical button! could you test it? 

[Michal Dudka]

I am not much oriented in sleep modes, but it looks like you go to sleep with disabled interrupts.

[harareyd]

When using __WFE() the board doesn't enter sleep mode at all unfortunately. It just skips right over the __WFE() instruction. I verified that the input is working. Sleep() is called when PC13 goes low.