为什么RCC_PCLK1Config(RCC_HCLK_Div2)函数不起作用？

static void Clock_Init(void)

{

        ErrorStatus HSEStartUpStatus;

        

        //Init RCC external facilities register

        RCC_DeInit();

        

        //Turn on the External High Speed oscillator (HSE).

        RCC_HSEConfig(RCC_HSE_ON);

        

        //Waits for HSE start-up.

        HSEStartUpStatus = RCC_WaitForHSEStartUp();

        

        //HSE is ready

        if(HSEStartUpStatus == SUCCESS)

        {         

                //Enables the Prefetch Buffer

                //FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);



                //Sets the code latency value to FLASH Two Latency cycles

                //FLASH_SetLatency(FLASH_Latency_2);     

                

                //Configures the AHB clock (HCLK).32MHz

                RCC_HCLKConfig(RCC_SYSCLK_Div1);



                //Configures the Low Speed APB clock (PCLK1).16MHz

                RCC_PCLK1Config(RCC_HCLK_Div2);



                //Configures the High Speed APB clock (PCLK2). 32MHz

                RCC_PCLK2Config(RCC_HCLK_Div1);



                RCC_PLLConfig(RCC_PLLSource_PREDIV1, RCC_PLLMul_4); 



                RCC_PLLCmd(ENABLE);



                while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);

                

                //Enables the RCC_SYSCLKSource_HSE.

                RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);



                //Check HSE used as system clock or not

                while(RCC_GetSYSCLKSource() != 0x08)

                {

                        // TODO : doing some thing here to prevent problem

                }        

        }

        else

        {

                // TODO : What append if not ?

        }

}

#define PRESCALER_TIMER3        ((uint16_t)15)            /*FCK_CNT = 16MHz / (15 + 1) = 1us   */

#define PERIOD_TIMER3                ((uint16_t)999)           /*T3 = FCK_CNT * PSC =  1us * (999 + 1) = 1ms */