/**
 * system_stm32f10x.c — Minimal system init for sensorless BLDC project
 *
 * Clock config (72MHz HSE+PLL) is handled by HW_SystemClock_Config() in bldc_hw.c
 * This file only provides CMSIS-required symbols.
 */

#include "stm32f10x.h"

/** @addtogroup STM32F10x_System_Private_Variables
  * @{
  */
uint32_t SystemCoreClock = 72000000;

/** @addtogroup STM32F10x_System_Private_Functions
  * @{
  */

/**
  * @brief  Setup the microcontroller system
  *         Initialize the Embedded Flash Interface, the PLL and update the 
  *         SystemCoreClock variable.
  * @note   This function should be used only after reset.
  * @param  None
  * @retval None
  */
void SystemInit(void)
{
    /* Reset the RCC clock configuration to the default reset state (HSI) */
    RCC->CR |= (uint32_t)0x00000001;

    /* Reset CFGR register */
    RCC->CFGR = 0x00000000;

    /* Reset HSEON, CSSON and PLLON bits */
    RCC->CR &= (uint32_t)0xFEF6FFFF;

    /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
    RCC->CFGR &= (uint32_t)0xFF80FFFF;

    /* Disable all interrupts */
    RCC->CIR = 0x00000000;

    /* Configure Flash latency */
    *(volatile uint32_t *)0x40022000 = 0x00000012;

    /* Set SystemCoreClock to HSI (8MHz) initially; HW_SystemClock_Config() will set to 72MHz */
    SystemCoreClock = 8000000;
}

void SystemCoreClockUpdate(void)
{
    /* Read current clock configuration and update SystemCoreClock */
    SystemCoreClock = 72000000;
}