public.c

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#include<AT89X52.h>
#include"LCDInterface.h"

#define uchar unsigned char

sbit KEY1=P1^0;
sbit LED1=P0^0;

void Public_Delay(uchar t)
{
  uchar i,j;
  for(i=0;i<t;i++)
    for(j=0;j<250;j++);
}

void Public_KeyHit()
{ 
  static uchar n=1;
  KEY1=1;
  if(KEY1==0)
  {
    Public_Delay(200);
    if(KEY1==0)
    {
      switch(n)
      {
        case 1: Menu1b(); n=2; break;
        case 2: Menu1c(); n=3; break;
        case 3: Menu1d(); n=4; break;
        case 4: Menu1a(); n=1; break;
        default: break;
      }
      LED1=1;
      Public_Delay(200);
      LED1=0;
    }
  }
}