138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
#include <NMEAGPS.h>
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//======================================================================
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// Program: SyncTime.ino
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//
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// Description: This program shows how to update the sub-second
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// part of a clock's seconds. You can adjust the clock update
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// interval to be as small as 9ms. It will calculate the
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// correct ms offset from each GPS second.
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//
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// Prerequisites:
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// 1) NMEA.ino works with your device
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// 2) GPS_FIX_TIME is enabled in GPSfix_cfg.h
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// 3) NMEAGPS_PARSE_RMC is enabled in NMEAGPS_cfg.h. You could use
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// any sentence that contains a time field. Be sure to change the
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// "if" statement in GPSloop from RMC to your selected sentence.
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//
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// 'Serial' is for debug output to the Serial Monitor window.
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//
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// License:
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// Copyright (C) 2014-2017, SlashDevin
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//
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// This file is part of NeoGPS
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//
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// NeoGPS is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// NeoGPS is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with NeoGPS. If not, see <http://www.gnu.org/licenses/>.
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//
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//======================================================================
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#include <GPSport.h>
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static NMEAGPS gps;
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static gps_fix fix;
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#if !defined(GPS_FIX_TIME)
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#error You must define GPS_FIX_TIME in GPSfix_cfg.h!
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#endif
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#if !defined(NMEAGPS_PARSE_RMC) & \
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!defined(NMEAGPS_PARSE_GLL) & \
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!defined(NMEAGPS_PARSE_GGA) & \
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!defined(NMEAGPS_PARSE_GST)
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#error You must define NMEAGPS_PARSE_RMC, GLL, GGA or GST in NMEAGPS_cfg.h!
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#endif
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#if !defined(NMEAGPS_TIMESTAMP_FROM_INTERVAL) & \
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!defined(NMEAGPS_TIMESTAMP_FROM_PPS)
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#error You must define NMEAGPS_TIMESTAMP_FROM_INTERVAL or PPS in NMEAGPS_cfg.h!
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#endif
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#if defined(NMEAGPS_TIMESTAMP_FROM_PPS)
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#warning You must modify this sketch to call gps.UTCsecondStart at the PPS rising edge (see NMEAGPS.h comments).
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#endif
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#ifdef NMEAGPS_INTERRUPT_PROCESSING
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#error You must *NOT* define NMEAGPS_INTERRUPT_PROCESSING in NMEAGPS_cfg.h!
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#endif
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//----------------------------------------------------------------
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static const uint32_t CLOCK_INTERVAL_MS = 100UL;
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static uint32_t lastShowTime = CLOCK_INTERVAL_MS+1; // First time never matches
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//----------------------------------------------------------------
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static void showTime( uint16_t subs, uint16_t factor = 100 /* hundredths */ )
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{
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uint8_t showSeconds = fix.dateTime.seconds;
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// Step by seconds until we're in the current UTC second
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while (subs >= 1000UL) {
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subs -= 1000UL;
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if (showSeconds < 59)
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showSeconds++;
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else
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showSeconds = 0;
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//DEBUG_PORT.print( '+' );
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}
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DEBUG_PORT.print( showSeconds );
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DEBUG_PORT.print( '.' );
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// Leading zeroes
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for (;;) {
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factor /= 10;
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if ((factor < 10) || (subs >= factor))
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break;
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DEBUG_PORT.print( '0' );
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}
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DEBUG_PORT.println( subs );
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} // showTime
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//--------------------------
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void setup()
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{
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DEBUG_PORT.begin(9600);
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while (!DEBUG_PORT)
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;
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DEBUG_PORT.print( F("SyncTime.INO: started\n") );
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DEBUG_PORT.println( F("Looking for GPS device on " GPS_PORT_NAME) );
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DEBUG_PORT.println( F("Local time seconds.milliseconds") );
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DEBUG_PORT.flush();
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gpsPort.begin( 9600 );
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}
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//--------------------------
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void loop()
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{
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while (gps.available( gpsPort )) {
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fix = gps.read();
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}
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if (fix.valid.time) {
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uint32_t UTCms = gps.UTCms();
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if (((UTCms % CLOCK_INTERVAL_MS) == 0) && (UTCms != lastShowTime)) {
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showTime( UTCms, 1000 );
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lastShowTime = UTCms;
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}
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}
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}
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