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Bug 584015 - gpsd has changed protocol, GPSDGeolocationProvider is broken; r=dougt

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Luca 2010-09-06 05:38:00 -04:00
parent c44fd37e30
commit 81db9abb2a
1 changed files with 38 additions and 40 deletions
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78
dom/system/GPSDGeolocationProvider.js
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@ -178,13 +178,8 @@ GPSDProvider.prototype = {
watch: function(c) {
LOG("watch called\n");
try {
// Turn GPSD buffer on, results in smoother data points which I think we want.
// Required due to the way that different data arrives in different NMEA sentences.
var bufferOption = "J=1\n";
this.outputStream.write(bufferOption, bufferOption.length);
// Go into "watcher" mode
var mode = "w\n";
var mode = '?WATCH={"enable":true,"json":true}';
this.outputStream.write(mode, mode.length);
} catch (e) { return; }
@ -196,54 +191,57 @@ GPSDProvider.prototype = {
var sInputStream = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(Ci.nsIScriptableInputStream);
sInputStream.init(inputStream);
var s = sInputStream.read(count);
var responseSentence = sInputStream.read(count);
var response = s.split('=');
var response = null;
try {
response = JSON.parse(responseSentence);
} catch (e) { return; }
var header = response[0];
var info = response[1];
// is this location information?
if (header != 'GPSD,O') {
// don't do anything
// is the right kind of sentence?
if (response.class != 'TPV') {
//don't do anything
return;
}
// is there a fix?
if (info == '?') {
if (response.mode == '1') {
// don't do anything
return;
}
// get the info from the string
var fields = info.split(' ');
// we'll only use RMC data as it seems to make sense
if (fields[0] != 'RMC') {
return;
}
LOG("Got info: " + info);
for (var i = 0; i < fields.length; i++) {
if (fields[i] == '?') {
fields[i] = null;
}
}
LOG("Got info: " + responseSentence);
// The API requires these values, if one is missing
// we return without updating the position.
if (response.time && response.lat && response.lon
&& response.epx && response.epy) {
var timestamp = response.time; // UTC
var latitude = response.lat; // degrees
var longitude = response.lon; // degrees
var horizontalError = Math.max(response.epx,response.epy); } // meters
else { return; }
var timestamp = fields[1]; // UTC
var timeError = fields[2]; // seconds
var latitude = fields[3]; // degrees
var longitude = fields[4]; // degrees
var altitude = fields[5]; // meters
var horizontalError = fields[6]; // meters
var verticalError = fields[7]; // meters
var course = fields[8]; // degrees;
var speed = fields[9]; // meters/sec maybe knots depending on GPSD version TODO: figure this out
// Altitude is optional, but if it's present, so must be vertical precision.
var altitude = null;
var verticalError = null;
if (response.alt && response.epv) {
altitude = response.alt; // meters
verticalError = response.epv; // meters
}
var speed = null;
if (response.speed) { var speed = response.speed; } // meters/sec
var course = null;
if (response.track) { var course = response.track; } // degrees
var geoPos = new GeoPositionObject(latitude, longitude, altitude, horizontalError, verticalError, course, speed, timestamp);
c.update(geoPos);
LOG("Position updated:" + timestamp + "," + latitude + "," + longitude + ","
+ horizontalError + "," + altitude + "," + verticalError + "," + course
+ "," + speed);
}