setupclock.c

stm32 USART1口配置与使用

#include <stm32f10x_lib.h>
void SetupClock(void);
ErrorStatus HSEStartUpStatus; 

void SetupClock(void)
{
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartUpStatus=RCC_WaitForHSEStartUp();
if(HSEStartUpStatus==SUCCESS)
{
	FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
    FLASH_SetLatency(FLASH_Latency_2);
	RCC_HCLKConfig(RCC_SYSCLK_Div1);
	RCC_PCLK1Config(RCC_HCLK_Div1);
	RCC_PCLK2Config(RCC_HCLK_Div4);
	RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);
	RCC_PLLCmd(ENABLE);
	while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY)==RESET)
    {}
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
    while(RCC_GetSYSCLKSource()!=0x08)
    {}		  
}

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOF,ENABLE);
}