scan.c

用holtek单片编写的时钟中断响应程序。

#include <ht46r62.h>

#pragma rambank0
bit direction;
unsigned int keyflag;
unsigned int ledflag;
unsigned int pressdown;
unsigned char *p;
unsigned char adcurrent;
const char numshow[10]=
 {0x05f,0x050,0x03d,0x79,0x72,0x6b,0x6f,0x51,0x7f,0x7b};

#pragma vector isr_4 @ 0x4
#pragma vector isr_8 @ 0x8
#pragma vector isr_c @ 0xc
#pragma vector isr_14 @ 0x14 

//ISR for safequard
//void isr_4(){} // external ISR
void isr_8(){} // timer/event 0

void isr_14(){_nop();
              _nop();
              _nop();} 

void isr_c()   // timer/event 1
{
 int i;
 _tmrc=0x80;

// if(ledflag==0)
//  { ledflag=1;
//    _pa7=1;
//  }
// else
//   {ledflag=0;
//    _pa7=0;
//   }

if(keyflag==1)
 {
  for(i=0;i<125;i++)
  {
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
   _delay(15000);
  }
  _pa7=0;
  keyflag=0;
 }
 
 _tmr=0;
 _tmrc=0x90;
 
} 

void led_check()  
{
 int i;
 
if(keyflag==1)
 {
  for(i=0;i<125;i++)
  {
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
  _delay(15000);
   _delay(15000);
  }
  _pa7=0;
  keyflag=0;
 }
 
  
} 

void timer_init()
{ _emi=1;
  _et01=1;
  _tmr=0;
  _tmrc=0x90;
}

void io_init()
 {
  _pac=0x08;
  _pa=0x0;
  _pbc=0xff;
  _pb=0xff;
  _pdc=0xff;
 // _pd=0x0ff;
  
}

void int_init()
{ _emi=1;
  _eei0=1;
}


  
void timer_base_interrupt()
   {_rtcc=0x0a;
    _emi=1;
    _erti=1;
    _acsr=0x00;
  }



void isr_4()
{_emi=0;
 _eif0=0;
 if(keyflag==0)
  {pressdown=1;
   keyflag=1;
   _pa7=1;}
 else
  {pressdown=0;
   keyflag=0;
   _pa7=0;
  }
 _emi=1;
 _eei0=1;
// timer_init();
}



void clr_screen()
 {unsigned int i;
   _bp=0x01;
   _mp1=0x49;
  for(i=0;i<10;i++)
  {
   
   #asm
   mov a,0h
   mov [02],a
   #endasm

   //_iar1=0x00;
   _mp1=_mp1+0x1;
  }
 }


void main()                           //show the input current 
 { 
   io_init();
   int_init();
   timer_init();
   keyflag=0;
   //timer_base_interrupt();
   clr_screen();
 while(1)
  {
    
    
  }
}