回复【2楼】正点原子:
---------------------------------
整体程序如下
void Clock_Init(void)
{
u8 i;
    RCC_DeInit  ( );                                      
    RCC_HSEConfig(RCC_HSE_OFF); //关闭HSE时钟
    RCC_HSICmd(ENABLE);                                             //时能HSI时钟
    while(RCC_GetFlagStatus  ( RCC_FLAG_HSIRDY) == RESET )          //等待HSI时钟稳定
    {
    }  
    FLASH_PrefetchBufferCmd(ENABLE);                                //开启FLASH预读缓冲功能，加速FLASH的读取
    FLASH_SetLatency(FLASH_Latency_1);                              //FLASH时序延迟1个周期，等待总线同步操作
    RCC_PLLConfig(RCC_PLLSource_HSI,RCC_PLLMul_4,RCC_PLLDiv_2);     //HSI作为PLL时钟4倍频，2分频
    RCC_HCLKConfig(RCC_SYSCLK_Div1);                                //AHB =  SYSCLK       16M
    RCC_PCLK2Config(RCC_HCLK_Div1) ;                                //APB2=16M
    RCC_PCLK1Config(RCC_HCLK_Div1);                                 //APB1=16M
    RCC_PLLCmd(ENABLE);                                           //只能PLL时钟
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)            //PLL稳定
    {
     }
   RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK) ;                    //选用PLL时钟为系统时钟32M
 i=RCC_GetSYSCLKSource();
    while(RCC_GetSYSCLKSource()!= 0x0C)//while(RCC_GetSYSCLKSource()!= 0x0C)//  //等待时钟稳定
    {

    }   
}