单片机按键触发中断_单片机按键触发中断

满意答案

jwp武乡

2017.05.12

采纳率：55%    等级：6

已帮助：2258人

#include

#define uchar unsigned char

uchar stepd[]={0x01,0x03,0x02,0x06,0x04,0xc0,0x08,0x09};

uchar num=0,fx=0;

sbit key1=P3^0;

sbit key2=P3^1;

sbit key3=P3^2;

unsigned int fcnt,scnt,ft,st;

void t0isr() interrupt 1

{

if(ft>0)

{

TH0=(65536-fcnt)/256;

TL0=(65536-fcnt)%256;

ft–;

}

else

{

TH0=(65536-fcnt)/256;

TL0=(65536-fcnt)%256;

st–;

}

if(ft==0 && st==0)TR0=0;

P2=stepd[num];

if(fx==0){num++;num%=8;}

if(fx==1)

{

if(num==0)num=7;

else num–;

}

}

main()

{

TMOD=0x01;

fcnt=5000;

scnt=10000;

TH0=(65536-fcnt)/256;

TL0=(65536-fcnt)%256;

TR0=1;

ET0=1;

EA=1;

while(1)

{

if(key1==0)

{

while(key1==0);

TR0=~TR0;

ft=1000;

st=500;

}

if(key2==0)

{

while(key2==0);

fx=0;

}

if(key3==0)

{

while(key3==0);

fx=1;

}

}

}

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