轮询实现按键实验

#include "exynos_4412.h"int main()
{//GPX1_1设置为输入模式//GPX1.CON=GPX1.CON & (~ (0XF<<4));while(1){if(!(GPX1.DAT&(1<<1))){printf("key pressed\n");while(!(GPX1.DAT&(1<<1)));}else{}}return 0;
}

作业：

#include "exynos_4412.h"int main(){//GPX1_1设置为输入模式//GPX1.CON = GPX1.CON & (~ (0XF<<4));//GPX2CON设置为输出模式//GPX2.CON = GPX2.CON & (~(0XF << 28)) |(0X1 << 28);int flag=0;while(1){if(!(GPX1.DAT&(1<<1))){	flag=~flag;while(!(GPX1.DAT&(1<<1)));}if(flag)	{//LED2亮////printf("key pressed\n");GPX2.DAT = GPX2.DAT | (1<<7);}else {//LED2熄灭GPX2.DAT=GPX2.DAT & (~(1<<7));}}return 0;
}

#include "exynos_4412.h"int main(){//将GPX1_1设置为中断功能//GPX_1.CON=GPX_1.CON | (0xF << 4);//设置GPX_1中断触发模式---下降沿触发//EXT_INT41_CON=EXT_INT41_CON & (~(0x7<<4)) |(0x2<<4);//使能GPX1_1---开启中断模式//EXT_INT41_MASK=EXT_INT41_MASK & (~(1<<1));return 0;}