#include "stm32f10x.h"
#define uint unsigned int
void Delay(uint time);
 void LEDInit(uint i);
int main(){
	RCC->APB2ENR |= (1<<2);   //开启时钟，GPIOA属于总线APB2；  GPIOA对应APB2的第二位 0：为关闭（默认）  1：开启
  while(1)
	{
    uint i;
		for (i = 0; i < 8; i++){
			LEDInit(i);
			Delay(100000); //试运行
     // GPIOA->ODR |= 0xFFFFFFFF; //延迟之后给灯高电平(熄灭)
     // Delay(1000000); //试运行		
		}
		if (i >= 8){
			i = 0;	
		}
	//GPIOA->CRL = 0x11111111;    //推挽输出   把PA0,PA1,PA2,PA3,PA4,PA4,PA5,PA6,PA7配置成输出
  //输出寄存器
	//GPIOA->ODR &= 0xFFFFFFFE;  //让GPIOA输出0   默认输出低电平亮
 }
}
void SystemInit(void){


}

//传入1000000就是1s
void Delay(uint time){
	uint i;
	for (i = 0; i < time; i++){
		uint t = 11;
		while (t != 0){
			t--;
		}
	}
	
}

void LEDInit(uint i){
	 GPIOA->ODR = 0;
	switch(i){
		case 0: 
			GPIOA->CRL = 0x01;  //把PA0设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFFE; //把PA0设置为低电平
		  break;
		case 1: 
			GPIOA->CRL = 0x10;  //把PA1设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFFD; //把PA1设置为低电平
		  break;
		case 2: 
			GPIOA->CRL = 0x100;  //把PA2设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFFC; //把PA2设置为低电平
		  break;
		case 3: 
			GPIOA->CRL = 0x1000;  //把PA3设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFFB; //把PA3设置为低电平
		  break;
		case 4: 
			GPIOA->CRL = 0x10000;  //把PA4设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFFA; //把PA4设置为低电平
		  break;
		case 5: 
			GPIOA->CRL = 0x100000;  //把PA5设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFF9; //把PA5设置为低电平
		  break;
		case 6: 
			GPIOA->CRL = 0x1000000;  //把PA6设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFF8; //把PA6设置为低电平
		  break;
		case 7: 
			GPIOA->CRL = 0x1000000;  //把PA7设置为推免输出
		  GPIOA->ODR &= 0xFFFFFFF7; //把PA7设置为低电平
		  break;
		
	}
	
}