nvic_configuration_configuration什么意思_没有configuration选项(2)

for(i=0;i<dly;i++)

for(j=1000;j>0;j--);

}

/*******************************************************************************

* Function Name: RCC_Configuration

* Description : Configures the different system clocks.

* Input : None

* Output : None

* Return : None

*******************************************************************************/

void RCC_Configuration(void)

{

//----------使用外部RC晶振-----------

RCC_DeInit(); //初始化为缺省值

RCC_HSEConfig(RCC_HSE_ON); //使能外部的高速时钟

while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET); //等待外部高速时钟使能就绪

FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); //Enable Prefetch Buffer

FLASH_SetLatency(FLASH_Latency_2); //Flash 2 wait state

RCC_HCLKConfig(RCC_SYSCLK_Div1); //HCLK = SYSCLK

RCC_PCLK2Config(RCC_HCLK_Div1); //PCLK2 =HCLK

RCC_PCLK1Config(RCC_HCLK_Div2); //PCLK1 = HCLK/2

RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9); //PLLCLK = 8MHZ * 9 =72MHZ

RCC_PLLCmd(ENABLE); //Enable PLLCLK

while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); //Wait till PLLCLK is ready

RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); //Select PLL as system clock

while(RCC_GetSYSCLKSource()!=0x08); //Wait till PLL is used as system clock source

//---------打开相应外设时钟--------------------

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); //使能APB2外设的GPIOA的时钟

//RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE); //使能APB2外设的GPIOA的时钟

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