stm32/powerctrl: Disable HSI if not needed to save a bit of power.
extern uint32_t _estack[];
#define BL_STATE ((uint32_t*)&_estack)
+static inline void powerctrl_disable_hsi_if_unused(void) {
+ #if !MICROPY_HW_CLK_USE_HSI && (defined(STM32F4) || defined(STM32F7) || defined(STM32H7))
+ // Disable HSI if it's not used to save a little bit of power
+ __HAL_RCC_HSI_DISABLE();
+ #endif
+}
+
NORETURN void powerctrl_mcu_reset(void) {
BL_STATE[1] = 1; // invalidate bootloader address
#if __DCACHE_PRESENT == 1
@@ -155,6 +162,8 @@ int powerctrl_rcc_clock_config_pll(RCC_ClkInitTypeDef *rcc_init, uint32_t sysclk
return -MP_EIO;
}
+ powerctrl_disable_hsi_if_unused();
+
return 0;
}
@@ -390,6 +399,8 @@ void powerctrl_enter_stop_mode(void) {
}
#endif
+ powerctrl_disable_hsi_if_unused();
+
#if defined(STM32F7)
if (RCC->DCKCFGR2 & RCC_DCKCFGR2_CK48MSEL) {
// Enable PLLSAI if it is selected as 48MHz source
