mirror of https://github.com/wb2osz/direwolf.git
Issue 241 - Catch up with new gpsd incompatbilities.
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wb2osz
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106
src/dwgpsd.c
106
src/dwgpsd.c
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@ -1,7 +1,7 @@
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//
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// This file is part of Dire Wolf, an amateur radio packet TNC.
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//
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// Copyright (C) 2013, 2014, 2015 John Langner, WB2OSZ
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// Copyright (C) 2013, 2014, 2015, 2020 John Langner, WB2OSZ
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//
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// This program 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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@ -55,13 +55,11 @@
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#include <gps.h>
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// Debian bug report: direwolf (1.2-1) FTBFS with libgps22 as part of the gpsd transition (#803605):
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// dwgps.c claims to only support GPSD_API_MAJOR_VERSION 5, but also builds successfully with
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// GPSD_API_MAJOR_VERSION 6 provided by libgps22 when the attached patch is applied.
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// Also compatible with API 7 & 8 with conditional compilation later.
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// An incompatibility was introduced with version 7
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// and again with 9 and again with 10.
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#if GPSD_API_MAJOR_VERSION < 5 || GPSD_API_MAJOR_VERSION > 8
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#if GPSD_API_MAJOR_VERSION < 5 || GPSD_API_MAJOR_VERSION > 10
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#error libgps API version might be incompatible.
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#endif
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@ -116,7 +114,7 @@ static void * read_gpsd_thread (void *arg);
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* shared region via dwgps_put_data.
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*
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* The application calls dwgps_read to get the most
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8 recent information.
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* recent information.
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*
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*--------------------------------------------------------------------*/
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@ -126,7 +124,7 @@ static void * read_gpsd_thread (void *arg);
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* Originally, I wanted to use the shared memory interface to gpsd
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* because it is simpler and more efficient. Just access it when we
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* actually need the data and we don't have a lot of extra unnecessary
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* busy work going on.
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* busy work going on constantly polling it when we don't need the information.
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*
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* The current version of gpsd, supplied with Raspian (Wheezy), is 3.6 from back in
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* May 2012, is missing support for the shared memory interface.
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@ -142,13 +140,28 @@ static void * read_gpsd_thread (void *arg);
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* cd gpsd-3.11
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* scons prefix=/usr libdir=lib/arm-linux-gnueabihf shm_export=True python=False
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* sudo scons udev-install
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*
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*
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* For now, we will use the socket interface. Maybe get back to this again someday.
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*
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* Update: January 2016.
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*
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* I'm told that the shared memory interface might work in Raspian, Jessie version.
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* Haven't tried it yet.
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*
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* June 2020: This is how to build the most recent.
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*
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* Based on https://www.satsignal.eu/raspberry-pi/UpdatingGPSD.html
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*
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* git clone https://gitlab.com/gpsd/gpsd.git gpsd-gitlab
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* cd gpsd-gitlab
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* scons --config=force
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* scons
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* sudo scons install
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*
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* The problem we have here is that the library is put in /usr/local/lib and direwolf
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* can't find it there. Solution is to define environment variable:
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*
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* export LD_LIBRARY_PATH=/use/local/lib
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*/
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@ -232,7 +245,7 @@ int dwgpsd_init (struct misc_config_s *pconfig, int debug)
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*
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*--------------------------------------------------------------------*/
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#define TIMEOUT 30
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#define TIMEOUT 15
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#if ENABLE_GPSD
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@ -255,10 +268,19 @@ static void * read_gpsd_thread (void *arg)
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while (1) {
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// Example code found here:
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// https://lists.nongnu.org/archive/html/gpsd-dev/2017-11/msg00001.html
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if ( ! gps_waiting(&gpsdata, TIMEOUT * 1000000)) {
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text_color_set(DW_COLOR_ERROR);
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dw_printf ("GPSD: Timeout waiting for GPS data.\n");
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/* Fall thru to read which should get error and bail out. */
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dw_printf ("------------------------------------------\n");
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dw_printf ("dwgpsd: Timeout waiting for GPS data.\n");
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dw_printf ("Is GPSD daemon running?\n");
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dw_printf ("Troubleshooting tip: Try running cgps or xgps.\n");
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dw_printf ("------------------------------------------\n");
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info.fix = DWFIX_ERROR;
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SLEEP_MS(5000);
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continue;
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}
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// https://github.com/wb2osz/direwolf/issues/196
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@ -290,16 +312,47 @@ static void * read_gpsd_thread (void *arg)
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break; // Jump out of loop and terminate thread.
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}
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#if GPSD_API_MAJOR_VERSION >= 9
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// The gps.h revision history says:
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// * mark altitude in gps_fix_t as deprecated and undefined
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// This seems really stupid to me.
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// If it is deprecated and undefined then take it out. Someone trying to use
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// it would get a compile error and know that something needs to be done.
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// Instead we all just go merrily on our way using a field that is [allegedly] undefined.
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// Why not simply add more variables with different definitions of altitude
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// and keep the original variable working as it always did?
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// If it is truly undefined, as the comment would have us believe, numerous
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// people will WASTE VAST AMOUNTS OF TIME pondering why altitude is now broken in
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// their applications.
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#define stupid_altitude altMSL
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#else
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#define stupid_altitude altitude
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#endif
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#if GPSD_API_MAJOR_VERSION >= 10
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// They did it again. Whimsical incompatibilities that cause
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// pain and aggravation for everyone trying to use this library.
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//
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// error: ‘struct gps_data_t’ has no member named ‘status’
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//
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// Yes, I can understand that it is a more logical place but it breaks
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// all existing code that uses this.
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// I'm really getting annoyed about wasting so much time on keeping up with all
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// of these incompatibilities that are completely unnecessary.
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#define stupid_status fix.status
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#else
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#define stupid_status status
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#endif
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// Inform user about change in fix status.
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switch (gpsdata.fix.mode) {
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default:
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case MODE_NOT_SEEN:
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if (info.fix >= DWFIX_2D) {
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text_color_set(DW_COLOR_INFO);
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dw_printf ("GPSD: Lost location fix.\n");
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}
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info.fix = DWFIX_NOT_SEEN;
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break;
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case MODE_NO_FIX:
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if (info.fix >= DWFIX_2D) {
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text_color_set(DW_COLOR_INFO);
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@ -325,11 +378,7 @@ static void * read_gpsd_thread (void *arg)
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break;
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}
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/* Data is available. */
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// TODO: what is gpsdata.status?
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if (gpsdata.status >= STATUS_FIX && gpsdata.fix.mode >= MODE_2D) {
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if (gpsdata.stupid_status >= STATUS_FIX && gpsdata.fix.mode >= MODE_2D) {
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info.dlat = isnan(gpsdata.fix.latitude) ? G_UNKNOWN : gpsdata.fix.latitude;
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info.dlon = isnan(gpsdata.fix.longitude) ? G_UNKNOWN : gpsdata.fix.longitude;
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@ -337,9 +386,15 @@ static void * read_gpsd_thread (void *arg)
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info.speed_knots = isnan(gpsdata.fix.speed) ? G_UNKNOWN : (MPS_TO_KNOTS * gpsdata.fix.speed);
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if (gpsdata.fix.mode >= MODE_3D) {
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info.altitude = isnan(gpsdata.fix.altitude) ? G_UNKNOWN : gpsdata.fix.altitude;
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info.altitude = isnan(gpsdata.fix.stupid_altitude) ? G_UNKNOWN : gpsdata.fix.stupid_altitude;
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}
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}
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else {
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// Keep the last known location.
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// Using info.fix, the caller knows if the location is current (DWFIX_[23]D),
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// last known (DWFIX_NONE), or never known (DWFIX_NOT_SEEN).
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info.fix = DWFIX_NO_FIX;
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}
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info.timestamp = time(NULL);
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if (s_debug >= 2) {
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@ -373,6 +428,7 @@ void dwgpsd_term (void) {
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#if ENABLE_GPSD
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gps_stream (&gpsdata, WATCH_DISABLE, NULL);
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gps_close (&gpsdata);
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#endif
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