stm32/powerctrl: Reenable PLL3 on H7 MCUs when waking from stop mode.

So that USB can work.
2020-01-31 23:23:56 +11:00 · 2020-01-31 23:23:56 +11:00 · af88e70414
commit af88e70414
parent 2c8c2b935e
1 changed files with 7 additions and 0 deletions
--- a/ports/stm32/powerctrl.c
+++ b/ports/stm32/powerctrl.c
@ -504,6 +504,13 @@ void powerctrl_enter_stop_mode(void) {
    }
    #endif

+    #if defined(STM32H7)
+    // Enable PLL3 for USB
+    RCC->CR |= RCC_CR_PLL3ON;
+    while (!(RCC->CR & RCC_CR_PLL3RDY)) {
+    }
+    #endif
+
    #if defined(STM32L4)
    // Enable PLLSAI1 for peripherals that use it
    RCC->CR |= RCC_CR_PLLSAI1ON;