From d77e8c75a1ee049e95fc72a92c341b3a3361bc8e Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Sun, 14 Mar 2004 23:04:32 +0000
Subject: [PATCH] - Filter the fuel switch position to allow it to slowly
 transition through   null space without killing the engine (hardware specific
 problem.) - NMEA output: I'm slightly confused but it appears that a real GPS
 outputs   traditional unix line endings on it's gps strings, we were
 outputing DOS   CR/LF which was causing some confusion.  This changes the
 line ending   convention to match that of a real gps. - Calculate true ground
 track and speed for NMEA.

---
 src/Network/atc610x.cxx | 23 ++++++++++++++++-------
 src/Network/nmea.cxx    | 38 ++++++++++++++++++++++++--------------
 2 files changed, 40 insertions(+), 21 deletions(-)

diff --git a/src/Network/atc610x.cxx b/src/Network/atc610x.cxx
index 1b901592f..e0111eb28 100644
--- a/src/Network/atc610x.cxx
+++ b/src/Network/atc610x.cxx
@@ -1309,10 +1309,10 @@ bool FGATC610x::do_radio_switches() {
                     // roll over
                     if ( digit_tuner[i] < last_digit_tuner[i] ) {
                         // going up
-                        diff = 15 - last_digit_tuner[i] + digit_tuner[i];
+                        diff = 16 - last_digit_tuner[i] + digit_tuner[i];
                     } else {
                         // going down
-                        diff = digit_tuner[i] - 15 - last_digit_tuner[i];
+                        diff = digit_tuner[i] - 16 - last_digit_tuner[i];
                     }
                 }
                 digit[i] += diff;
@@ -1863,11 +1863,20 @@ bool FGATC610x::do_switches() {
         fuel = 0;
     }
 
-    static int fuel1, fuel2, fuel3;
-    fuel3 = fuel2;
-    fuel2 = fuel1;
-    fuel1 = fuel;
-    if ( fuel1 == fuel2 && fuel2 == fuel3 ) {
+    const int max_fuel = 60;
+    static int fuel_list[max_fuel];
+    int i;
+    for ( i = max_fuel - 1; i >= 0; --i ) {
+      fuel_list[i+1] = fuel_list[i];
+    }
+    fuel_list[0] = fuel;
+    bool all_same = true;
+    for ( i = 0; i < max_fuel - 1; ++i ) {
+      if ( fuel_list[i] != fuel_list[i+1] ) {
+	all_same = false;
+      }
+    }
+    if ( all_same ) {
         fgSetBool( "/controls/fuel/tank[0]/fuel_selector", (fuel & 0x01) > 0 );
         fgSetBool( "/controls/fuel/tank[1]/fuel_selector", (fuel & 0x02) > 0 );
     }
diff --git a/src/Network/nmea.cxx b/src/Network/nmea.cxx
index a8aaadc26..dfc7d5edb 100644
--- a/src/Network/nmea.cxx
+++ b/src/Network/nmea.cxx
@@ -88,7 +88,7 @@ bool FGNMEA::gen_message() {
     }
     deg = (int)(latd);
     min = (latd - (double)deg) * 60.0;
-    sprintf( gga_lat, "%02d%06.3f,%c", abs(deg), min, dir);
+    sprintf( gga_lat, "%02d%07.4f,%c", abs(deg), min, dir);
     sprintf( rmc_lat, "%02d%07.4f,%c", abs(deg), min, dir);
 
     char gga_lon[20], rmc_lon[20];
@@ -101,18 +101,27 @@ bool FGNMEA::gen_message() {
     }
     deg = (int)(lond);
     min = (lond - (double)deg) * 60.0;
-    sprintf( gga_lon, "%03d%06.3f,%c", abs(deg), min, dir);
+    sprintf( gga_lon, "%03d%07.4f,%c", abs(deg), min, dir);
     sprintf( rmc_lon, "%03d%07.4f,%c", abs(deg), min, dir);
 
+    double vn = fgGetDouble( "/velocities/speed-north-fps" );
+    double ve = fgGetDouble( "/velocities/speed-east-fps" );
+    double fps = sqrt( vn*vn + ve*ve );
+    double mps = fps * SG_FEET_TO_METER;
+    double kts = mps * SG_METER_TO_NM * 3600;
     char speed[10];
-    sprintf( speed, "%05.1f", cur_fdm_state->get_V_equiv_kts() );
+    sprintf( speed, "%.1f", kts );
 
+    double hdg_true = atan2( ve, vn ) * SGD_RADIANS_TO_DEGREES;
+    if ( hdg_true < 0 ) {
+      hdg_true += 360.0;
+    }
     char heading[10];
-    sprintf( heading, "%05.1f", cur_fdm_state->get_Psi() * SGD_RADIANS_TO_DEGREES );
+    sprintf( heading, "%.1f", hdg_true );
 
     char altitude_m[10];
-    sprintf( altitude_m, "%02d", 
-	     (int)(cur_fdm_state->get_Altitude() * SG_FEET_TO_METER) );
+    sprintf( altitude_m, "%.1f", 
+	     cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 
     char date[10];
     int year = t->getGmt()->tm_year;
@@ -128,14 +137,15 @@ bool FGNMEA::gen_message() {
     } else {
 	dir = 'E';
     }
-    sprintf( magvar, "%05.1f,%c", magdeg, dir );
+    sprintf( magvar, "%.1f,%c", magdeg, dir );
  
-    // $GPRMC,HHMMSS,A,DDMM.MMMM,N,DDDMM.MMMM,W,XXX.X,XXX.X,DDMMYY,XXX.X,E*XX
-    sprintf( rmc, "GPRMC,%s,A,%s,%s,%s,%s,%s,%s",
+    // $GPRMC,HHMMSS,A,DDMM.MMMM,N,DDDMM.MMMM,W,XXX.X,XXX.X,DDMMYY,XXX.X,E,A*XX
+    sprintf( rmc, "GPRMC,%s,A,%s,%s,%s,%s,%s,%s,A",
 	     utc, rmc_lat, rmc_lon, speed, heading, date, magvar );
     sprintf( rmc_sum, "%02X", calc_nmea_cksum(rmc) );
 
-    sprintf( gga, "GPGGA,%s,%s,%s,1,08,0.9,%s,M, , ",
+    // $GPGGA,HHMMSS,DDMM.MMMM,N,DDDMM.MMMM,W,1,NN,H.H,AAAA.A,M,GG.G,M,,*XX
+    sprintf( gga, "GPGGA,%s,%s,%s,1,08,0.9,%s,M,0.0,M,,",
 	     utc, gga_lat, gga_lon, altitude_m );
     sprintf( gga_sum, "%02X", calc_nmea_cksum(gga) );
     sprintf( gsa, "%s",
@@ -152,20 +162,20 @@ bool FGNMEA::gen_message() {
     nmea_sentence += rmc;
     nmea_sentence += "*";
     nmea_sentence += rmc_sum;
-    nmea_sentence += "\r\n";
+    nmea_sentence += "\n";
 
     // GGA sentence
     nmea_sentence += "$";
     nmea_sentence += gga;
     nmea_sentence += "*";
     nmea_sentence += gga_sum;
-    nmea_sentence += "\r\n";
+    nmea_sentence += "\n";
 
     // GSA sentence (totally faked)
     nmea_sentence += gsa;
-    nmea_sentence += "\r\n";
+    nmea_sentence += "\n";
 
-//     cout << nmea_sentence;
+    // cout << nmea_sentence;
 
     length = nmea_sentence.length();
     strncpy( buf, nmea_sentence.c_str(), length );