单片机方波发生器程序

ID:194460 · 发表于 2017-5-22 16:49

#include <reg51.h>
unsigned long pinlv=0;
unsigned char anjian;
void huoqu()
{ while(P2==0Xff&&P3==0xff);
  while(P3!=0xfb)
  switch(P2)
{ case 0xfe:anjian=0; while(P2!=0xff); break;
   case 0xfd:anjian=1; while(P2!=0xff); break;
      case 0xfb:anjian=2; while(P2!=0xff); break;
      case 0xf7:anjian=3; while(P2!=0xff); break;
      case 0xef:anjian=4; while(P2!=0xff); break;
      case 0xdf:anjian=5; while(P2!=0xff); break;
      case 0xbf:anjian=6; while(P2!=0xff); break;
      case 0x7f:anjian=7; while(P2!=0xff); break;
      default:break;
      }

   switch(P3)
   {
   case 0xfe:anjian=8; while(P3!=0xff); break;
   case 0xfd:anjian=9; while(P3!=0xff); break;
      default:break;
   pinlv=pinlv*10+anjian;}
}

void timer()
{
unsigned long time;
unsigned int i;
time=1000000/pinlv/2;
  if(time<1) time=1;
  if(time>1000000)time=1000000;
      TMOD=0X02;
      TH0=0;TL0=0;
      for(i=0;i<time/256;i++)
{  TR0=1;
      while(!TF0);
      TF0=0;
}
TR0=0;
TH0=256-time%256;
TL0=256-time%256;
TR0=1;
while(!TF0);
TF0=0;
TR0=0;
}

void main()
{

huoqu();
while(1)
{
P0=0X01;timer();
P0=0X0;timer();
}
}

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单片机方波发生器程序

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