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stm32/powerctrl: Improve standby mode entry code for H7 MCUs. 

Changes in this commit:
- Clear and mask D2 EXTIs.
- Set correct voltage scaling level for standby mode.
- Disable debug MCU (if debugging is disabled), for all MCU series.
This commit is contained in:
iabdalkader 2022-12-03 19:58:24 +01:00 committed by Damien George
parent 564945a2a0
commit 5b7f71882b
1 changed files with 25 additions and 2 deletions
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27
ports/stm32/powerctrl.c
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@ -875,6 +875,18 @@ void powerctrl_enter_standby_mode(void) {
MICROPY_BOARD_ENTER_STANDBY MICROPY_BOARD_ENTER_STANDBY
#endif #endif
#if defined(STM32H7)
// Note: According to ST reference manual, RM0399, Rev 3, Section 7.7.10,
// before entering Standby mode, voltage scale VOS0 must not be active.
uint32_t vscaling = POWERCTRL_GET_VOLTAGE_SCALING();
if (vscaling == PWR_REGULATOR_VOLTAGE_SCALE0) {
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);
// Wait for PWR_FLAG_VOSRDY
while (!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {
}
}
#endif
// We need to clear the PWR wake-up-flag before entering standby, since // We need to clear the PWR wake-up-flag before entering standby, since
// the flag may have been set by a previous wake-up event. Furthermore, // the flag may have been set by a previous wake-up event. Furthermore,
// we need to disable the wake-up sources while clearing this flag, so // we need to disable the wake-up sources while clearing this flag, so
@ -926,8 +938,14 @@ void powerctrl_enter_standby_mode(void) {
// Restore EWUP state // Restore EWUP state
PWR->CSR2 |= csr2_ewup; PWR->CSR2 |= csr2_ewup;
#elif defined(STM32H7) #elif defined(STM32H7)
EXTI_D1->PR1 = 0x3fffff; // Clear and mask D1 EXTIs.
PWR->WKUPCR |= PWR_WAKEUP_FLAG1 | PWR_WAKEUP_FLAG2 | PWR_WAKEUP_FLAG3 | PWR_WAKEUP_FLAG4 | PWR_WAKEUP_FLAG5 | PWR_WAKEUP_FLAG6; EXTI_D1->PR1 = 0x3fffffu;
EXTI_D1->IMR1 &= ~(0xFFFFu); // 16 lines
// Clear and mask D2 EXTIs.
EXTI_D2->PR1 = 0x3fffffu;
EXTI_D2->IMR1 &= ~(0xFFFFu); // 16 lines
// Clear all wake-up flags.
PWR->WKUPCR |= PWR_WAKEUP_FLAG_ALL;
#elif defined(STM32G0) || defined(STM32G4) || defined(STM32L4) || defined(STM32WB) #elif defined(STM32G0) || defined(STM32G4) || defined(STM32L4) || defined(STM32WB)
// clear all wake-up flags // clear all wake-up flags
PWR->SCR |= PWR_SCR_CWUF5 | PWR_SCR_CWUF4 | PWR_SCR_CWUF3 | PWR_SCR_CWUF2 | PWR_SCR_CWUF1; PWR->SCR |= PWR_SCR_CWUF5 | PWR_SCR_CWUF4 | PWR_SCR_CWUF3 | PWR_SCR_CWUF2 | PWR_SCR_CWUF1;
@ -952,6 +970,11 @@ void powerctrl_enter_standby_mode(void) {
PWR->CSR1 |= PWR_CSR1_EIWUP; PWR->CSR1 |= PWR_CSR1_EIWUP;
#endif #endif
#if defined(NDEBUG)
// Disable Debug MCU.
DBGMCU->CR = 0;
#endif
// enter standby mode // enter standby mode
HAL_PWR_EnterSTANDBYMode(); HAL_PWR_EnterSTANDBYMode();
// we never return; MCU is reset on exit from standby // we never return; MCU is reset on exit from standby