嵌入式——独立键盘扫描

最新推荐文章于 2023-07-16 11:52:14 发布

转载最新推荐文章于 2023-07-16 11:52:14 发布 · 178 阅读

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原文链接：http://www.cnblogs.com/huhudollar/p/5192986.html

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#嵌入式

#include <reg51.h>
#define IO_KEY P1

void Delay(unsigned int c);
unsigned char KeyScan();

void main(){
    unsigned char key = 0;
    while(1){
        key = KeyScan();
        Delay(100);
    }
}

void Delay(unsigned int c){
    unsigned char a,b;
    for(;c>0;c--)
        for(b=13;b>0;b--)
            for(a=38;a>0;a--);
}

unsigned char KeyScan(){
    unsigned char key = 0;
    if(IO_KEY != 0xff){
        Delay(10);        //延时10ms，消除抖动
        if(IO_KEY != 0xff){
            key = IO_KEY;
        }
    }
    return key;
}