NMEA.ino

#include <NMEAGPS.h>

//======================================================================
//  Program: NMEA.ino
//
//  Description:  This program uses the fix-oriented methods available() and
//    read() to handle complete fix structures.
//
//    When the last character of the LAST_SENTENCE_IN_INTERVAL (see NMEAGPS_cfg.h)
//    is decoded, a completed fix structure becomes available and is returned
//    from read().  The new fix is saved the 'fix' structure, and can be used
//    anywhere, at any time.
//
//    If no messages are enabled in NMEAGPS_cfg.h, or
//    no 'gps_fix' members are enabled in GPSfix_cfg.h, no information will be
//    parsed, copied or printed.
//
//  Prerequisites:
//     1) Your GPS device has been correctly powered.
//          Be careful when connecting 3.3V devices.
//     2) Your GPS device is correctly connected to an Arduino serial port.
//          See GPSport.h for the default connections.
//     3) You know the default baud rate of your GPS device.
//          If 9600 does not work, use NMEAdiagnostic.ino to
//          scan for the correct baud rate.
//     4) LAST_SENTENCE_IN_INTERVAL is defined to be the sentence that is
//          sent *last* in each update interval (usually once per second).
//          The default is NMEAGPS::NMEA_RMC (see NMEAGPS_cfg.h).  Other
//          programs may need to use the sentence identified by NMEAorder.ino.
//     5) NMEAGPS_RECOGNIZE_ALL is defined in NMEAGPS_cfg.h
//
//  'Serial' is for debug output to the Serial Monitor window.
//
//======================================================================

//-------------------------------------------------------------------------
//  The GPSport.h include file tries to choose a default serial port
//  for the GPS device.  If you know which serial port you want to use,
//  edit the GPSport.h file.

#include <GPSport.h>

//------------------------------------------------------------
// For the NeoGPS example programs, "Streamers" is common set
//   of printing and formatting routines for GPS data, in a
//   Comma-Separated Values text format (aka CSV).  The CSV
//   data will be printed to the "debug output device".
// If you don't need these formatters, simply delete this section.

#include <Streamers.h>

//------------------------------------------------------------
// This object parses received characters
//   into the gps.fix() data structure

static NMEAGPS  gps;

//------------------------------------------------------------
//  Define a set of GPS fix information.  It will
//  hold on to the various pieces as they are received from
//  an RMC sentence.  It can be used anywhere in your sketch.

static gps_fix  fix;

//----------------------------------------------------------------
//  This function gets called about once per second, during the GPS
//  quiet time.  It's the best place to do anything that might take
//  a while: print a bunch of things, write to SD, send an SMS, etc.
//
//  By doing the "hard" work during the quiet time, the CPU can get back to
//  reading the GPS chars as they come in, so that no chars are lost.

static void doSomeWork()
{
  // Print all the things!

  trace_all( DEBUG_PORT, gps, fix );

} // doSomeWork

//------------------------------------
//  This is the main GPS parsing loop.

static void GPSloop()
{
  while (gps.available( gpsPort )) {
    fix = gps.read();
    doSomeWork();
  }

} // GPSloop

//--------------------------

void setup()
{
  DEBUG_PORT.begin(9600);
  while (!DEBUG_PORT)
    ;

  DEBUG_PORT.print( F("NMEA.INO: started\n") );
  DEBUG_PORT.print( F("  fix object size = ") );
  DEBUG_PORT.println( sizeof(gps.fix()) );
  DEBUG_PORT.print( F("  gps object size = ") );
  DEBUG_PORT.println( sizeof(gps) );
  DEBUG_PORT.println( F("Looking for GPS device on " GPS_PORT_NAME) );

  #ifndef NMEAGPS_RECOGNIZE_ALL
    #error You must define NMEAGPS_RECOGNIZE_ALL in NMEAGPS_cfg.h!
  #endif

  #ifdef NMEAGPS_INTERRUPT_PROCESSING
    #error You must *NOT* define NMEAGPS_INTERRUPT_PROCESSING in NMEAGPS_cfg.h!
  #endif

  #if !defined( NMEAGPS_PARSE_GGA ) & !defined( NMEAGPS_PARSE_GLL ) & \
      !defined( NMEAGPS_PARSE_GSA ) & !defined( NMEAGPS_PARSE_GSV ) & \
      !defined( NMEAGPS_PARSE_RMC ) & !defined( NMEAGPS_PARSE_VTG ) & \
      !defined( NMEAGPS_PARSE_ZDA ) & !defined( NMEAGPS_PARSE_GST )

    DEBUG_PORT.println( F("\nWARNING: No NMEA sentences are enabled: no fix data will be displayed.") );

  #else
    if (gps.merging == NMEAGPS::NO_MERGING) {
      DEBUG_PORT.print  ( F("\nWARNING: displaying data from ") );
      DEBUG_PORT.print  ( gps.string_for( LAST_SENTENCE_IN_INTERVAL ) );
      DEBUG_PORT.print  ( F(" sentences ONLY, and only if ") );
      DEBUG_PORT.print  ( gps.string_for( LAST_SENTENCE_IN_INTERVAL ) );
      DEBUG_PORT.println( F(" is enabled.\n"
                            "  Other sentences may be parsed, but their data will not be displayed.") );
    }
  #endif

  DEBUG_PORT.print  ( F("\nGPS quiet time is assumed to begin after a ") );
  DEBUG_PORT.print  ( gps.string_for( LAST_SENTENCE_IN_INTERVAL ) );
  DEBUG_PORT.println( F(" sentence is received.\n"
                        "  You should confirm this with NMEAorder.ino\n") );

  trace_header( DEBUG_PORT );
  DEBUG_PORT.flush();

  gpsPort.begin( 9600 );
}

//--------------------------

void loop()
{
  GPSloop();
}