GPIO->ODR |= 0<<0;

P0 = 0XFE； // 总线操作
sbit LED1 = P0^0； //位操作
LED1 = 0；

位带简介：

外设位带区
1 AliasAddr= =0x42000000+ (A-0x40000000)84 +n4
SRAM 位带区
1 AliasAddr= =0x22000000+ (A-0x20000000)84 +n4

“位带地址+位序号”转’换成别名区地址统一成一个宏。
#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x02000000+((addr & 0x00FFFFFF)<<5)+(bitnum<<2))

main.c

#include "stm32f10x.h"
#include "bsp_led.h"
#include "bsp_key.h"

#define GPIOA_ODR_Addr	(GPIOA_BASE+0X0C)
#define PAout(n) *(unsigned*)((GPIOA_ODR_Addr & 0xF0000000)+0x02000000+((GPIOA_ODR_Addr & 0x00FFFFFF)<<5)+(n<<2))
 
#define GPIOC_IDR_Addr	(GPIOC_BASE+0X08)
#define PCin(n) *(unsigned*)((GPIOC_IDR_Addr & 0xF0000000)+0x02000000+((GPIOC_IDR_Addr & 0x00FFFFFF)<<5)+(n<<2))


void Delay(uint32_t count)
{
		for(;count!=0; count--);
}

int main(void)
{
	//来到这个系统时钟被配置成72M
	LED_GPIO_Config();
	KEY_GPIO_Config();
#if 0	
		while(1)
	{
		//LED_R(OFF);
		//GPIO_SetBits(LED_G_GPIO_PORT, LED_G_GPIO_PIN);
		PAout(8) = 1;
		Delay(0xFFFFF);
		//GPIO_ResetBits(LED_G_GPIO_PORT, LED_G_GPIO_PIN);
		//LED_R(ON);
		PAout(8) = 0;
		Delay(0xFFFFF);
	}
	
#else 
	while(1)
	{
		if( PCin(8) == KEY_ON );
		{
			while(PCin(8) == KEY_ON);
			LED_G_TOGGLE;
		}
	}
	
#endif
	
} 

位带操作不会被中断，避免数据的丢失。