ARM STMF32103 Clock settings

void SetSysClockTo72(void)
{
  /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------*/   
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();
 
  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);
 
  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();
 
  if (HSEStartUpStatus == SUCCESS)
  {
    /* Flash 0 wait state */
    FLASH_SetLatency(FLASH_Latency_0);
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 
 
    /* PCLK1 = HCLK */
    RCC_PCLK1Config(RCC_HCLK_Div1);
    
    /* PLLCLK = (8MHz) * 9 = 72 MHz */
    RCC_PREDIV1Config(RCC_PREDIV1_Source_HSE, RCC_PREDIV1_Div1);
    RCC_PLLConfig(RCC_PLLSource_PREDIV1, RCC_PLLMul_9);
 
    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);
 
    /* Wait till PLL is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }
 
    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
 
    /* Wait till PLL is used as system clock source */
    while (RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
  else
  {
    /* If HSE fails to start-up, the application will have wrong clock configuration.
       User can add here some code to deal with this error */    
    /* Go to infinite loop */
    while (1)
    {
    }
  }
} 
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