使用这个到板子里面：
#include <reg52.h>
sbit ADDR0 = P1^0
sbit ADDR1 = P1^1
sbit ADDR2 = P1^2
sbit ADDR3 = P1^3
sbit ENLED = P1^4
sbit KEY1 = P2^4
sbit KEY2 = P2^5
sbit KEY3 = P2^6
sbit KEY4 = P2^7
unsigned char code LedChar[] = { //数码管显示字符转换表0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E}
void delay()
void main(){
bit keybuf = 1//按键值暂存，临时保存按键的扫描值
bit backup = 1//按键值备份，保存前一次的扫描值
unsigned char cnt = 0//按键计数，记录按键按下的次数
ENLED = 0 //选择数码管 DS1 进行显示
ADDR3 = 1
ADDR2 = 0
ADDR1 = 0
ADDR0 = 0
P2 = 0xF7 //P2.3 置 0，即 KeyOut1 输出低电平
P0 = LedChar[cnt] //显示按键次数初值
while (1){
keybuf = KEY4 //把当前扫描值暂存
if (keybuf != backup){ //当前值与前次值不相等说明此时按键有动作
delay() //延时大约 10ms
if (keybuf == KEY4){ //判断扫描值有没有发生改变，即按键抖动
if (backup == 0){ //如果前次值为 0，则说明当前是弹起动作
cnt++ //按键次数+1
//只用 1 个数码管显示，所以加到 10 就清零重新开始
if (cnt >= 10){
cnt = 0
}
P0 = LedChar[cnt]//计数值显示到数码管上
}
backup = keybuf//更新备份为当前值，以备进行下次比较
}
}
}
}
/* 软件延时函数，延时约 10ms */
void delay(){
unsigned int i = 1000
while (i--)
}
key为按键，规定按下为低电平if（key==0）
{
delay（50）； //延时50ms，消抖
if（key==0） //再判断是否按下
{
while（！key）； 松手检测
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该按键按下要实现的功能程序
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}
}
我的习惯是这样写
