基于状态机的51单片机AT89C52独立按键的检测proteus仿真

#include<reg52.h> #define uchar unsigned char #define uint unsigned int sbit dula=P3^0; sbit wela=P3^1; sbit keyport=P3^2; #define keystate0 0 //按键第一次按下状态 #define keystate1 1 //按键按下确认状态 #define keystate2 2 char keystate=2; //按键状态初始化为按键无动作状态 uint num1=0,num2=0; uchar temp[8]=0; //从高位到低位对应数码管从左到右 void delayms(uint x) //1ms { uint y,z; for(y=x;y>0;y--) for(z=111;z>0;z--); } uchar code table[]={ //共阳数码管 0xc0,0xf9,0xa4,0xb0, 0x99,0x92,0x82,0xf8, 0x80,0x90,0x88,0x83, 0xc6,0xa1,0x86,0x8e}; void smg() { dula=0; wela=0; P2=0x01; wela=1; wela=0; P2=table[temp[7]]; dula=1; dula=0; delayms(1); P2=0x02; wela=1; wela=0; P2=table[temp[6]]; dula=1; dula=0; delayms(1); P2=0x04; wela=1; wela=0; P2=table[temp[5]]; dula=1; dula=0; delayms(1); P2=0x08; wela=1; wela=0; P2=table[temp[4]]; dula=1; dula=0; delayms(1); P2=0x10; wela=1; wela=0; P2=table[temp[3]]; dula=1; dula=0; delayms(1); P2=0x20; wela=1; wela=0; P2=table[temp[2]]; dula=1; dula=0; delayms(1); P2=0x40; wela=1; wela=0; P2=table[temp[1]]; dula=1; dula=0; delayms(1); P2=0x80; wela=1; wela=0; P2=table[temp[0]]; dula=1; dula=0; delayms(1); } void proc() { temp[0]=num1%10; temp[1]=num1%100/10; temp[2]=num1%1000/100; temp[3]=num1/1000; temp[4]=num2%10; temp[5]=num2%100/10; temp[6]=num2%1000/100; temp[7]=num2/1000; } char keyscan() { switch(keystate) { case keystate0: //keystate0，第一次检测到按键按下状态，下一状态为keystate1(按键按下确认状态) keystate=keystate1; return 0; case keystate1: //keystate1,按键按下确认状态，下一状态为keystate2(按键无动作状态) if(!keyport) { keystate=keystate2; while(!keyport); return 1; } else keystate=keystate2; return 0; case keystate2: //keystate2，按键无动作状态，下一状态为keystate0(第一次检测到按键按下状态) if(!keyport) { keystate=keystate0; } else keystate=keystate2; return 0; } } void main() { while(1) { if(keyscan()) { num1++; if(num1>=10000) { num1=0; num2++; if(num2>=10000) { num2=0; } } proc(); } smg(); } }