zzu.cpp

This is a GPS communication source code to interrupt the NMEA code though serial port. Very good

#include "nmea0183.h"
#pragma hdrstop

/*
** Author: Samuel R. Blackburn
** Internet: [e-mail]
**
** You can use it any way you like as long as you don't try to sell it.
**
** Copyright, 1996, Samuel R. Blackburn
**
** $Workfile: zzu.cpp $
** $Revision: 5 $
** $Modtime: 10/10/98 2:38p $
*/

/*
** This Sentence Not Recommended For New Designs
** ZDA is recommended.
*/

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

ZZU::ZZU()
{
   Mnemonic = "ZZU";
   Empty();
}

ZZU::~ZZU()
{
   Mnemonic.Empty();
   Empty();
}

void ZZU::Empty( void )
{
   UTCTimeString.Empty();
}

BOOL ZZU::Parse( const SENTENCE& sentence )
{
   /*
   ** ZZU - Time UTC
   **
   **        1          2
   **        |          |  
   ** $--ZZU,hhmmss.ss,*hh<CR><LF>
   **
   ** 1) Universal Time Coordinated (UTC)
   ** 2) Checksum
   */

   /*
   ** First we check the checksum...
   */

   if ( sentence.IsChecksumBad( 2 ) == True )
   {
      SetErrorMessage( "Invalid Checksum" );
      return( FALSE );
   }

   CTime temp_time = CTime::GetCurrentTime();

   int year  = temp_time.GetYear();
   int month = temp_time.GetMonth();
   int day   = temp_time.GetDay();

   UTCTimeString = sentence.Field( 1 );

   char temp_number[ 3 ];

   temp_number[ 2 ] = 0x00;

   temp_number[ 0 ] = UTCTimeString[ 0 ];
   temp_number[ 1 ] = UTCTimeString[ 1 ];

   int hours = ::atoi( temp_number );

   temp_number[ 0 ] = UTCTimeString[ 2 ];
   temp_number[ 1 ] = UTCTimeString[ 3 ];

   int minutes = ::atoi( temp_number );

   temp_number[ 0 ] = UTCTimeString[ 4 ];
   temp_number[ 1 ] = UTCTimeString[ 5 ];

   int seconds = ::atoi( temp_number );

   UTCTime = CTime( year, month, day, hours, minutes, seconds );

   return( TRUE );
}

BOOL ZZU::Write( SENTENCE& sentence )
{
   /*
   ** Let the parent do its thing
   */
   
   RESPONSE::Write( sentence );

   sentence += UTCTimeString;

   sentence.Finish();

   return( TRUE );
}

const ZZU& ZZU::operator = ( const ZZU& source )
{
   UTCTimeString      = source.UTCTimeString;
   UTCTime            = source.UTCTime;

   return( *this );
}