mirror of https://github.com/espruino/BangleApps
260 lines
10 KiB
HTML
260 lines
10 KiB
HTML
<html>
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<head>
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<link rel="stylesheet" href="../../css/spectre.min.css">
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</head>
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<body>
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<h2>Assisted GPS</h2>
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<p>GPS can take a long time (~5 minutes) to get an accurate position the first time it is used.
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AGPS uploads a few hints to the GPS receiver about satellite positions that allow it
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to get a faster, more accurate fix - however they are only valid for a short period of time.</p>
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<div id="banglejs1-info" style="display:none">
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<p>You can upload data that covers a longer period of time, but the upload will take longer.</p>
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<div class="form-group">
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<label class="form-label">AGPS Validity time</label>
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<label class="form-radio">
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<input type="radio" name="agpsperiod" value="1d"><i class="form-icon"></i> 1 day (8kB)
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</label>
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<label class="form-radio">
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<input type="radio" name="agpsperiod" value="2d" checked><i class="form-icon"></i> 2 days (14kB)
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</label>
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<label class="form-radio">
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<input type="radio" name="agpsperiod" value="3d"><i class="form-icon"></i> 3 days (20kB)
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</label>
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<label class="form-radio">
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<input type="radio" name="agpsperiod" value="1wk"><i class="form-icon"></i> 1 week (46kB)
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</label>
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</div>
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</div>
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<div id="banglejs2-info" style="display:none">
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<p>Using fewer GNSS systems may decrease the time to fix. (If unsure, select only GPS)</p>
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<div class="form-group">
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<label class="form-label">Select which GNSS system you want.</label>
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<label class="form-radio">
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<input type="radio" name="gnss_select" value="1" checked><i class="form-icon"></i> GPS (fastest to get a fix)
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</label>
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<label class="form-radio">
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<input type="radio" name="gnss_select" value="2"><i class="form-icon"></i> BDS
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</label>
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<label class="form-radio">
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<input type="radio" name="gnss_select" value="3"><i class="form-icon"></i> GPS+BDS
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</label>
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<label class="form-radio">
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<input type="radio" name="gnss_select" value="4"><i class="form-icon"></i> GLONASS
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</label>
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<label class="form-radio">
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<input type="radio" name="gnss_select" value="5"><i class="form-icon"></i> GPS+GLONASS
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</label>
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<label class="form-radio">
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<input type="radio" name="gnss_select" value="6"><i class="form-icon"></i> BDS+GLONASS
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</label>
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<label class="form-radio">
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<input type="radio" name="gnss_select" value="7"><i class="form-icon"></i> GPS+BDS+GLONASS
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</label>
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</div>
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</div>
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<p id="upload-wrap" style="display:none">Click <button id="upload" class="btn btn-primary">Upload</button></p>
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<script src="../../core/lib/customize.js"></script>
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<script>
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var isB1; // is Bangle.js 1?
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var isB2; // is Bangle.js 2?
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var currentPosition;
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// When the 'upload' button is clicked...
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document.getElementById("upload").addEventListener("click", function() {
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var url;
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if (isB1) {
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var radios = document.getElementsByName('agpsperiod');
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url = "https://www.espruino.com/agps/assistnow_1d.base64";
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for (var i=0; i<radios.length; i++)
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if (radios[i].checked)
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url = "https://www.espruino.com/agps/assistnow_"+radios[i].value+".base64";
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}
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if (isB2) {
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url = "https://www.espruino.com/agps/casic.base64";
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}
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console.log("Sending...");
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//var text = document.getElementById("agpsperiod").value;
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get(url, function(b64) {
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var js = jsFromBase64(b64);
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sendCustomizedApp({
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storage:[
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{name:"RAM", content:js},
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]
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});
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});
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});
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// =================================================== Bangle.js 1 UBLOX
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function UBX_CMD(cmd) {
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var d = [0xB5,0x62]; // sync chars
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d = d.concat(cmd);
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var a=0,b=0;
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for (var i=2;i<d.length;i++) {
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a += d[i];
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b += a;
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}
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d.push(a&255,b&255);
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return d;
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}
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function UBX_MGA_INI_TIME_UTC() {
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var a = new Uint8Array(4+24);
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a.set([0x13,0x40,24,0]);
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a.set([ 0x10, // 0: type
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0, // 1: version
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0, // 2: ref - none
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0x80] ); // 3: leapsecs - unknown
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var d = new Date();
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d.setTime(d.getTime()+d.getTimezoneOffset()*60000); // get as UTC
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var dv = new DataView(a.buffer, 4);
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dv.setUint16(4, d.getFullYear());
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dv.setUint8(6, d.getMonth()+1);
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dv.setUint8(7, d.getDate());
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dv.setUint8(8, d.getHours());
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dv.setUint8(9, d.getMinutes());
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dv.setUint8(10, d.getSeconds());
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dv.setUint16(16, 10*60); // seconds part of accuracy - 10 minutes
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return UBX_CMD([].slice.call(a));
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}
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// =================================================== Bangle.js 2 CASIC
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// https://www.espruino.com/Bangle.js2+Technical#gps
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function CASIC_CHECKSUM(cmd) {
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var cs = 0;
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for (var i=1;i<cmd.length;i++)
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cs = cs ^ cmd.charCodeAt(i);
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return cmd+"*"+cs.toString(16).toUpperCase().padStart(2, '0');
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}
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// Send a binary CASIC packet, eg: {classId:6, messageId:0, payload:[]}
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function CASIC_PKT(pkt) {
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pkt.payload = pkt.payload || [];
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var plen = pkt.payload.length;
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var msg = new Uint8Array(10+pkt.payload.length);
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msg.set([0xBA,0xCE,
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plen, // LENGTH
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0x00,
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pkt.classId, // CLASS ID
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pkt.messageId]); // MESSAGE ID
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msg.set(pkt.payload, 6);
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var dv = new DataView(msg.buffer);
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// checksum
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var ckSum = 0;
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for (i = -4; i < plen; i+=4)
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ckSum = 0|(ckSum+dv.getUint32(6+i, true));
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dv.setUint32(6+plen, ckSum, true);
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return msg;
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}
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// Send AID_INI message, {lat,lon,alt}
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function AID_INI(pos) {
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var msg = new Uint8Array(56);
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var dv = new DataView(msg.buffer);
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/*
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double xOrLat, yOrLon, zOrAlt;
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double tow; // 24
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float df; // 32
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float posAcc; // 36
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float tAcc; // 40
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float fAcc; // 44
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unsigned int res; // 48
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unsigned short int wn; // 52
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unsigned char timeSource; // 54
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unsigned char flags; // 55
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*/
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var ms = Date.now();
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var wk = (ms-new Date("1980-01-06T00:00:00Z")) / 604800000;
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var wn = Math.floor(wk); // week number
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var tow = (wk-wn) * 604800; // seconds in week
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dv.setFloat64(0, pos.lat, true); // xOrLat
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dv.setFloat64(8, pos.lon, true); // yOrLon
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dv.setFloat64(16, pos.alt, true); // zOrAlt
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dv.setFloat64(24, tow, true); // tow
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dv.setFloat32(32, 0, true); // df
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dv.setFloat32(36, 0, true); // posAcc
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dv.setFloat32(40, 0, true); // tAcc
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dv.setFloat32(44, 0, true); // fAcc
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dv.setUint32(48, 0, true); // res
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dv.setUint16(52, wn, true); // wn
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dv.setUint8(54,0); // timeSource
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dv.setUint8(55, 0x23); // flags ( lat/lon and clock valid, no drift data )
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return CASIC_PKT({classId:0x0B, messageId:0x01, payload:msg});
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}
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// ===================================================
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function jsFromBase64(b64) {
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var bin = atob(b64);
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var chunkSize = 128;
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var js = "\x10Bangle.setGPSPower(1,'agps');\n"; // turn GPS on
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if (isB1) { // UBLOX
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//js += `\x10Bangle.on('GPS-raw',function (d) { if (d.startsWith("\\xB5\\x62\\x05\\x01")) Terminal.println("GPS ACK"); else if (d.startsWith("\\xB5\\x62\\x05\\x00")) Terminal.println("GPS NACK"); })\n`;
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//js += "\x10var t=getTime()+1;while(t>getTime());\n"; // wait 1 sec
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js += `\x10Serial1.write(atob("${btoa(String.fromCharCode.apply(null,UBX_MGA_INI_TIME_UTC()))}"))\n`; // set GPS time
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}
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if (isB2) { // CASIC
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// Select what GNSS System to use for decreased fix time.
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var radios = document.getElementsByName('gnss_select');
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var gnss_select="1";
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for (var i=0; i<radios.length; i++)
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if (radios[i].checked)
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gnss_select=radios[i].value;
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js += `\x10var t=getTime()+0.5;while (getTime()<t);\n`; // This is nasty - but we just wait here until the GPS has had time to boot
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js += `\x10Serial1.println("${CASIC_CHECKSUM("$PCAS04,"+gnss_select)}")\n`; // set GNSS mode
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js += `\x10Serial1.println("${CASIC_CHECKSUM("$PCAS03,1,0,0,1,1,0,0,0")}")\n`; // enable GGA,GSV,RMC packets (new Bangle.js 2 GPS firmwares don't include RMC by default!)
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// If the browser let us have the current location, give it to the GPS chip to get a faster fix
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if (currentPosition) {
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js += `\x10Serial1.write([${AID_INI(currentPosition).join(",")}])\n`;
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}
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// Serial1.println("$PCAS06,0*1B") gets the current firmware version
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}
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for (var i=0;i<bin.length;i+=chunkSize) {
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var chunk = bin.substr(i,chunkSize);
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js += `\x10Serial1.write(atob("${btoa(chunk)}"))\n`;
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}
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js += "\x10setTimeout(() => Bangle.setGPSPower(0,'agps'), 1000);\n"; // turn GPS off after a delay
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return js;
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}
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function get(url,callback) {
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console.log("Loading "+url);
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var oReq = new XMLHttpRequest();
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oReq.addEventListener("load", function() {
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var b64 = this.responseText;
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console.log("Response received...");
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callback(b64);
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});
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oReq.open("GET", url);
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oReq.send();
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}
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// Called when we know what device we're using
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function onInit(device) {
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isB2 = (device && device.id=="BANGLEJS2");
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isB1 = !isB2;
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document.getElementById("banglejs1-info").style = isB1?"":"display:none";
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document.getElementById("banglejs2-info").style = isB2?"":"display:none";
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document.getElementById("upload-wrap").style = "";
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if (isB2) {
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// get current position for AGPS improvement
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navigator.geolocation.getCurrentPosition(function(position) {
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currentPosition = {
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lat : position.coords.latitude,
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lon : position.coords.longitude,
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alt : 0|position.coords.altitude
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};
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});
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}
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}
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</script>
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</body>
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</html>
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