按键控制灯（寄存器）

寄存器）"/>

按键控制灯（寄存器）

核心：基地址加偏移地址，然后通过位操作

main.c

void delay(int time)
{while(time --);}
int main()
{//使能GPIOCunsigned int *pRcc = (unsigned int *)(0x40021000 +  0x18);*pRcc |= (1<<4); //使能GPIOApRcc = (unsigned int *)(0x40021000 + 0x18);*pRcc |= (1<<2);//设置GPIOC 13为输出模式unsigned int *pMode = (unsigned int *)(0x40011000 + 0x04);*pMode |= (0x01 << 20);//设置GPIOA 10为输入模式pMode = (unsigned int *)(0x40010800 + 0x04);*pMode &= ~(0x01 << 8);*pMode |= (0x01 << 10);//浮空输入while(1){//GPIOC13输出1unsigned int *pOutput = (unsigned int *)(0x40011000 + 0x0C);
//    *pOutput |= (1 << 13);unsigned int *pInput = (unsigned int *)(0x40010800 + 0x08);//     //延时
//     delay(1000000); 
//    //GPIOC13输出0      
//    *pOutput &= (0 << 13);        
//    delay(1000000);//如果GPIOA 10读取的是高电平，灯就灭if((*pInput &= (1<<10)) > 0){*pOutput |= (1 << 13);//灭}else{*pOutput &= (0 << 13); //亮}}//    return 0;
}