状态机按键

ID:86145 · 发表于 2017-12-29 10:46

#include<reg52.h>

sbit key_1 = P1^0;
sbit key_2 = P1^1;

bit key_evein ;
void key_scan()
{

unsigned int mode, count;
// mode =0;
// count =0;

switch(mode)
{
case 0:
if(!key_1)
{
mode = 1;
P0=0x55;
}
break;

case 1:

if(key_1==0)
{
count++;
if(count>50)
{
count = 0;
mode=2;

}
}
else if (key_1)
{
mode=0;
}
break;
case 2:
if(key_1)
{
P3=0xf0;
mode=0;

}
else if(key_1)
{
mode = 4;
}
break;
case 4:
if(key_1==0)
{
count++;
if(count==5000)
{
count = 0;
mode = 5;
}
}
break;
case 5:
   if(key_1)
   {
P3=0x0f;
   mode=0;
   }

}
}

void main ()
{
TMOD = 0x01;
TH0  = (65536-1000)/256;
   TL0  = (65536-1000)%256;
TR0  = 1;

   EA = 1;
   ET0= 1;

while (1)
{
if(key_evein) key_scan();

}
}

void timer (void ) interrupt 1
{
   TR0 = 0;
TH0  = (65536-1000)/256;
   TL0  = (65536-1000)%256;
   TR0 =1;
   key_evein=1;

}

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