flipperzero-firmware/firmware/targets/f6/api-hal/api-hal-clock.c

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#include <api-hal-clock.h>
#include <stm32wbxx_ll_rcc.h>
void api_hal_clock_switch_to_hsi() {
LL_RCC_HSI_Enable( );
while(!LL_RCC_HSI_IsReady());
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);
LL_RCC_SetSMPSClockSource(LL_RCC_SMPS_CLKSOURCE_HSI);
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI);
}
void api_hal_clock_switch_to_pll() {
LL_RCC_HSE_Enable();
LL_RCC_PLL_Enable();
while(!LL_RCC_HSE_IsReady());
while(!LL_RCC_PLL_IsReady());
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
LL_RCC_SetSMPSClockSource(LL_RCC_SMPS_CLKSOURCE_HSE);
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL);
}