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stm32/powerctrl: Save and restore EWUP state when configuring standby. 

This allows the user to enable wake-up sources using the EWUP bits, on F7
MCUs.

Disabling the wake-up sources while clearing the wake-up flags follows the
reference manual and ST examples.
This commit is contained in:
Peter Hinch 2020-09-27 08:42:52 +01:00 committed by Damien George
parent 85ea4ac0e5
commit 0facd891e7
1 changed files with 4 additions and 0 deletions
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4
ports/stm32/powerctrl.c
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@ -712,10 +712,14 @@ void powerctrl_enter_standby_mode(void) {
RTC->ISR &= ~ISR_BITS;
#if defined(STM32F7)
// Save EWUP state
uint32_t csr2_ewup = PWR->CSR2 & (PWR_CSR2_EWUP6 | PWR_CSR2_EWUP5 | PWR_CSR2_EWUP4 | PWR_CSR2_EWUP3 | PWR_CSR2_EWUP2 | PWR_CSR2_EWUP1);
// disable wake-up flags
PWR->CSR2 &= ~(PWR_CSR2_EWUP6 | PWR_CSR2_EWUP5 | PWR_CSR2_EWUP4 | PWR_CSR2_EWUP3 | PWR_CSR2_EWUP2 | PWR_CSR2_EWUP1);
// clear global wake-up flag
PWR->CR2 |= PWR_CR2_CWUPF6 | PWR_CR2_CWUPF5 | PWR_CR2_CWUPF4 | PWR_CR2_CWUPF3 | PWR_CR2_CWUPF2 | PWR_CR2_CWUPF1;
// Restore EWUP state
PWR->CSR2 |= csr2_ewup;
#elif defined(STM32H7)
EXTI_D1->PR1 = 0x3fffff;
PWR->WKUPCR |= PWR_WAKEUP_FLAG1 | PWR_WAKEUP_FLAG2 | PWR_WAKEUP_FLAG3 | PWR_WAKEUP_FLAG4 | PWR_WAKEUP_FLAG5 | PWR_WAKEUP_FLAG6;