From 7dc2f4ed384f45eb943e0b7dc39a539af7058b80 Mon Sep 17 00:00:00 2001 From: iabdalkader Date: Thu, 3 Dec 2020 19:46:07 +0200 Subject: [PATCH] stm32/powerctrl: Ensure SysTick is disabled on STOP mode entry for H7. 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. --- ports/stm32/powerctrl.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/ports/stm32/powerctrl.c b/ports/stm32/powerctrl.c index 076215ba9f..bf8be647f4 100644 --- a/ports/stm32/powerctrl.c +++ b/ports/stm32/powerctrl.c @@ -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); }