mini stm32开发板入门教程(11)

mini stm32开发板入门教程

第一步:配置RCC寄存器和SysTick寄存器RCC_Configuration:配置RCC寄存器voidRCC_Configuration(void){

/*RCCsystemreset(fordebugpurpose)*/RCC_DeInit();

/*EnableHSE*/

RCC_HSEConfig(RCC_HSE_ON);

/*WaittillHSEisready*/

HSEStartUpStatus=RCC_WaitForHSEStartUp();if(HSEStartUpStatus==SUCCESS){

/*HCLK=SYSCLK*/

RCC_HCLKConfig(RCC_SYSCLK_Div1);/*PCLK2=HCLK*/

RCC_PCLK2Config(RCC_HCLK_Div1);/*PCLK1=HCLK/2*/

RCC_PCLK1Config(RCC_HCLK_Div2);

/*Flash2waitstate*/

FLASH_SetLatency(FLASH_Latency_2);/*EnablePrefetchBuffer*/

FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);/*PLLCLK=8MHz*9=72MHz*/

RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);/*EnablePLL*/

RCC_PLLCmd(ENABLE);

/*WaittillPLLisready*/

while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY)==RESET){}

/*SelectPLLassystemclocksource*/

RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);/*WaittillPLLisusedassystemclocksource*/while(RCC_GetSYSCLKSource()!=0x08){}}

/*EnableGPIOAandAFIOclocks*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|