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stm32/powerctrl: Ensure SysTick is disabled on STOP mode entry for H7.

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Even though IRQs are disabled this seems to be required on H7 Rev Y,
otherwise Systick interrupt triggers and the MCU leaves the stop mode
immediately.
This commit is contained in:
iabdalkader 2020-12-03 19:46:07 +02:00 committed by Damien George
parent 7b9b6d080a
commit 7dc2f4ed38
1 changed files with 12 additions and 0 deletions
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12
ports/stm32/powerctrl.c
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@ -502,6 +502,13 @@ void powerctrl_enter_stop_mode(void) {
// executed until after the clocks are reconfigured
uint32_t irq_state = disable_irq();
#if defined(STM32H7)
// Disable SysTick Interrupt
// Note: This seems to be required at least on the H7 REV Y,
// otherwise the MCU will leave stop mode immediately on entry.
SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk;
#endif
#if defined(MICROPY_BOARD_ENTER_STOP)
MICROPY_BOARD_ENTER_STOP
#endif
@ -659,6 +666,11 @@ void powerctrl_enter_stop_mode(void) {
MICROPY_BOARD_LEAVE_STOP
#endif
#if defined(STM32H7)
// Enable SysTick Interrupt
SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk;
#endif
// Enable IRQs now that all clocks are reconfigured
enable_irq(irq_state);
}