/******************************************************************************
*
* project name: TICT Tutorial Series 1 - PART II
* file name:    timer2.c
* initial date: 31/10/2000
* author:       thomas.nussbaumer@gmx.net
* description:  simple clock example using an own interrupt handling routine
*
* build this program by typing: tigcc -O2 timer2.c
*
*
* $Id: timer2.c,v 1.1 2000/11/01 10:44:46 Thomas Nussbaumer Exp $
*
******************************************************************************/

#define SAVE_SCREEN

#include <tigcclib.h>

int _ti89, _ti92plus;  // produce code for TI89 and TI92plus

INT_HANDLER oldint5 = NULL;

volatile int mseconds50 = 0; // counts in 50ms steps (not exact 50ms, but 1000/19 ms)
volatile int seconds    = 0; // counts seconds
volatile int minutes    = 0; // counts minutes
volatile int hours      = 0; // counts hours
volatile int resettime  = 1;


DEFINE_INT_HANDLER (myint5handler) {
    //----------------------------------------------
    // if resettime is not 0 all clock variables are
    // reset to 0
    //----------------------------------------------
    if (resettime) {
        mseconds50=seconds=minutes=hours=resettime=0;
    }
    else {
        mseconds50++;
        if (mseconds50 == 19) {
            mseconds50 = 0;
            seconds++;
            if (seconds == 60) {
                seconds = 0;
                minutes++;
                if (minutes == 60) {
                   minutes = 0;
                   hours++;
                   if (hours == 24) hours = 0;
                }
            }
        }
    }
    ExecuteHandler(oldint5);
}


void _main(void) {
    ClrScr();
    resettime = 1;

    oldint5 = GetIntVec(AUTO_INT_5);
    SetIntVec(AUTO_INT_5, myint5handler);

    while (!kbhit()) {
        if (TI89) printf_xy(50, 50, "%02d:%02d:%02d.%03d",hours,minutes,seconds,mseconds50*50);
        else      printf_xy(70, 64, "%02d:%02d:%02d.%03d",hours,minutes,seconds,mseconds50*50);
    }

    SetIntVec(AUTO_INT_5, oldint5);
    GKeyFlush();
}

//=============================================================================
// Revision History
//=============================================================================
//
// $Log: timer2.c,v $
// Revision 1.1  2000/11/01 10:44:46  Thomas Nussbaumer
// initial version
//
//
//