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#include <pic.h>
#include  "delay.h"

#define delete_flag timer_flag=0

unsigned char timer;
unsigned char impulse;
unsigned char tone_that_not_play;
static bit disable @ (unsigned)&PORTA*8+4;
static bit out @ (unsigned)&PORTA*8+1;
static bit out_inverse @ (unsigned)&PORTA*8+0;
static unsigned char states@ 0x2e;
static bit state_out@ (unsigned)&states*8+1;
static bit  timer_flag @ (unsigned)&INTCON*8+2;

void
DelayMs_2(unsigned char cnt)
{
    unsigned char   i;
    do { asm("CLRWDT");
      if(tone_1)
         return;
        i = 4;
        do {
            DelayUs(250);
        } while(--i);
    } while(--cnt);
}

void
DelayMs(unsigned char cnt)
{
    unsigned char   i;
    do { asm("CLRWDT");
        i = 4;
        do {
            DelayUs(250);
        } while(--i);
    } while(--cnt);
}

void tone_1_2(unsigned char that_another_tone)
{
     out=0;
     out_inverse=1;
     state_out=0;
     TMR0=timer;
     tone_1_2_start:
     delete_flag;
     disable=0;
     tone_1_2_playing:
     while(timer_flag==0)
          {
        if((TMR0-timer)>=impulse)
             {out=0;
              out_inverse=0;
             }
          }
     delete_flag;
     TMR0=timer;
     if(state_out==0)
        out_inverse=1;
     else
        out=1;
     state_out=state_out+1;
     if((PORTA&0x0c)==that_another_tone)
        return;
     asm("CLRWDT");
     goto tone_1_2_playing;
}

void main()
{
    CMCON=0x07;//portA are normal inputs (for 16F628A)
    TRISA=0x0c;
    TRISB=0xff;
     disable=1;
    OPTION=0x81;   //WDT 18 msec, preset TMR0 with 4

    out=0;
    out_inverse=0;

    timer=107;
        impulse=0x1d;

    tone_1_2(tone_that_not_play);
}