t_alarmbell.c

schduler for AVR mcu

/*
------------------------------------------------------------------*-

   T_AlarmBell.C (v1.00)

  ------------------------------------------------------------------
   
   Key scan  program (Test Version 1.0)


   COPYRIGHT
   ---------

   This code is from the book:

   PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont 
   [Pearson Education, 2001; ISBN: 0-201-33138-1].

   This code is copyright (c) 2001 by Michael J. Pont.
 
   --- Modefied by  sylva zhu to apply for  AVR Microcontroller .
   --- Ver 1.0  Sept 25th , 2006 .

-*------------------------------------------------------------------
*/
#include  <iom32.h>
#include  <inavr.h>
#include  <comp_a90.h>

#include  "Main.h"
#include  "T_AlarmBell.h"
#include  "T_KeyProcess.h"
//
//
void ALARM_BELL_TRIG_Update(void)
{
  static unsigned char cycle=0;
  //
  if( FAlarmBell==1 )
    {
      // Enable bell alarming .
      PORTD|=(1<<PORTD7);     //  Enable  bell
      cycle+=1;
      //
      if( cycle>1 )
        {
          FAlarmBell=0;
          cycle=0;
        }
      //
      
    }
  else 
    {
      cycle=0;
      PORTD&=~(1<<PORTD7);    //  Stop  bell
    }
}