STM32-6-跑马灯（时钟使能）

#include "stm32f10x.h" 
uint16_t temp, i,temp1,j; 
void Delay(unsigned int count)
{ 
 unsigned int i; 
 for(;count!=0;count--) 
 { 
 i=5000; 
 while(i--); 
 } 
} 
void main(void) 
{ 
 RCC->APB2ENR|=1<<3;
GPIOB->CRL&=0X00000000;	 
GPIOB->CRH&=0XFFFFFF00;	
GPIOB->CRL|=0X33333333;	
GPIOB->CRH|=0X33333333;
GPIOB->ODR|=0X03ff;
 while(1) 
 { 
 //GPIO_SetBits(GPIOB, 0xFFFF); 
	 GPIOB->ODR=~0X0FFFF;
 temp = 0x0001; 
 for(i=0;i<16;i++) 
 { 
 //GPIO_ResetBits(GPIOB, temp);
GPIOB->ODR=~temp;	 
 Delay(50); 
 temp =( temp<<1)+1; 
 } 
 temp = 0x0000; 
 for(j=0;j<16;j++) 
 { 
 //GPIO_SetBits(GPIOB, temp); 
	 GPIOB->ODR=temp;
 Delay(50); 
 temp = (temp>>1)+ 0x8000;
 }
 
 } 
}