STM32时钟程序

yanmingyuan

http://item.taobao.com/item.htm?spm=686.1000925.0.0.BIFw7T&id=39947701892
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
    RCC_DeInit();  //?±?????í????  /* RCC system reset(for debug purpose) */
    RCC_HSEConfig(RCC_HSE_ON);  //?ò???????§??  //Enable HSE
    HSEStartUpStatus = RCC_WaitForHSEStartUp();  //?????????§?????÷  //Wait till HSE is ready
    if(HSEStartUpStatus == SUCCESS)
    {
        RCC_HCLKConfig(RCC_SYSCLK_Div1);    //AHB?????????±??   //HCLK = SYSCLK
        RCC_PCLK2Config(RCC_HCLK_Div1);     //APB2??HCLK/1      //PCLK2 = HCLK/1
        RCC_PCLK1Config(RCC_HCLK_Div2);     //APB1??HCLK/2      //PCLK1 = HCLK/2
        RCC_ADCCLKConfig(RCC_PCLK2_Div4);   //?è??ADC?±??????
        //×???AHB?÷???????????????÷?±????PB2????AD??I/O??????TIM???®??1??APB1????DA??USB??SPI??I2C??CAN???®??2345?????¨TIM??

        //FLASH_SetLatency(FLASH_Latency_2);  //flash??×÷?????±  //Flash 2 wait state
        //FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);  //flash?????????????? //Enable Prefetch Buffer
     
        RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);  //PLLCLK = 8MHz * 9 = 72MHz
        RCC_PLLCmd(ENABLE);  //????PLL //Enable PLL
        while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)  //????PLL????  /* Wait till PLL is ready */
        {
        }
        RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);  //??PLL?è?????????±????  /* Select PLL as system clock source */
        while(RCC_GetSYSCLKSource() != 0x08)  //?????????±??????????  /* Wait till PLL is used as system clock source */
        {
        }
    }
// RCC_HSICmd(ENABLE);//?????????????§?? ;
// RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);//?????????????±??×÷???????±??SYSCLOCK=8MHZ 
// RCC_HCLKConfig(RCC_SYSCLK_Div1);//????HCLK?±???????????±??SYSCLOCK
// RCC_PCLK1Config(RCC_HCLK_Div4);//APB1?±????2M 
// RCC_PCLK2Config(RCC_HCLK_Div4);//APB2?±????2M

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOG,ENABLE);
}

正点原子

楼主，这是要？