pll.c

#include "../STM32F446RE/stm32f4xx.h"
#include "../STM32F446RE/stm32f446xx.h"

#include "pll.h"

void clockSpeed_PLL(){

    RCC->CR |= RCC_CR_HSION;
    while (!(RCC->CR & RCC_CR_HSIRDY));

    RCC->PLLCFGR = (PLL_M) | (PLL_N << 6) | (PLL_P << 16) | (PLL_Q << 24);
    RCC->PLLCFGR &=~ RCC_PLLCFGR_PLLSRC;

    RCC->CFGR |= RCC_CFGR_HPRE_DIV1 | RCC_CFGR_PPRE2_DIV2 | RCC_CFGR_PPRE1_DIV4;

    RCC->CR |= RCC_CR_PLLON;
    while (!(RCC->CR & RCC_CR_PLLRDY));

    RCC->APB1ENR |= RCC_APB1ENR_PWREN;
    
    PWR->CR |= PWR_CR_ODEN;
    while (!(PWR->CSR & PWR_CSR_ODRDY)) ;
    
    PWR->CR |= PWR_CR_ODSWEN;
    while (!(PWR->CSR & PWR_CSR_ODSWRDY)) ;

    FLASH->ACR = FLASH_ACR_PRFTEN | FLASH_ACR_ICEN | FLASH_ACR_DCEN | FLASH_ACR_LATENCY_5WS;

    RCC->CFGR &=~ RCC_CFGR_SW;
    RCC->CFGR |= RCC_CFGR_SW_PLL;
    while ((RCC->CFGR & RCC_CFGR_SWS ) != RCC_CFGR_SWS_PLL);

}