stm32f105/107互联性时钟配置参考函数

/************************************************************************
** Function Name : RCC_Configuration
** Description      : 配置时钟
** Input Parameters  :
               
** Output Parameters :
                = 1  : 保存成功
                = 0  : 保存失败
    note :                        
************************************************************************/

void RCC_Configuration(void)
{
    ErrorStatus HSEStartUpStatus;
 // 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 2 wait state
        FLASH_SetLatency(FLASH_Latency_2);
        // Enable Prefetch Buffer
        FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

  // HCLK = SYSCLK     AHB时钟为系统时钟  72MHz
        RCC_HCLKConfig(RCC_SYSCLK_Div1);

        // PCLK2 = HCLK     APB2时钟为系统时钟 72MHz
        RCC_PCLK2Config(RCC_HCLK_Div1);

        // PCLK1 = HCLK/2     APB1时钟为系统时钟 72MHz/2=36MHz
        RCC_PCLK1Config(RCC_HCLK_Div2);

        RCC_PREDIV2Config(RCC_PREDIV2_Div2);     //  8M / 2 = 4M
 
  RCC_PLL2Config(RCC_PLL2Mul_10);          //  4M * 10 = 40M
 
  RCC_PREDIV1Config(RCC_PREDIV1_Source_PLL2,RCC_PREDIV1_Div5); //  40M / 5 = 8M
  // Enable PLL2 wait stable
  RCC_PLL2Cmd(ENABLE);
  while((RCC->CR & RCC_CR_PLL2RDY) == 0)
     {
     }
  RCC_PLLConfig(RCC_PLLSource_PREDIV1,RCC_PLLMul_9);      //   PLL 8M * 9 = 72 M
  
  
  // Enable PLL1
  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)
        {
        }
    } 
 
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO |
                                            RCC_APB2Periph_GPIOA |
                                            RCC_APB2Periph_GPIOB |
                                            RCC_APB2Periph_GPIOC |
           RCC_APB2Periph_GPIOD |
                                            RCC_APB2Periph_USART1 |
                                            RCC_APB2Periph_SPI1
                                            , ENABLE);
                                           
 
     RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG |
                                            RCC_APB1Periph_USART2 |
           RCC_APB1Periph_SPI2   |
                                            RCC_APB1Periph_USART3 |
                                            RCC_APB1Periph_TIM3  
//           RCC_APB1Periph_TIM4   |
//                                            RCC_APB1Periph_CAN1 |
//                                            RCC_APB1Periph_CAN2
                                            , ENABLE);   
    #if EnableWdt                                           
    RCC_LSICmd(ENABLE);//打开LSI
    while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY)==RESET);//等待直到LSI稳定
    #endif
}