Andrew Boyson
A GPS disciplined clock
Dependencies: net lpc1768 crypto clock web log
Diff: http-derived/nmea/http-nmea-script.js
- Revision:
- 49:115a5e4fac0c
- Parent:
- 48:9f1ab7784067
--- a/http-derived/nmea/http-nmea-script.js Wed Mar 27 18:40:21 2019 +0000
+++ b/http-derived/nmea/http-nmea-script.js Sat Apr 06 11:35:55 2019 +0000
@@ -1,21 +1,25 @@
'use strict';
-var response = '';
-var headers = '';
-var gpsTrace = false; //nibble 0 : bit 0
-var gpsVerbose = false; //nibble 0 : bit 1
-var nmeaMsgTrace = false; //nibble 0 : bit 2
-var nmeaCmdTrace = false; //nibble 0 : bit 3
-var nmeaLat = 0; //nibble 1
-var nmeaLng = 0; //nibble 9
-var nmeaHgt = 0; //nibble 17
-var nmeaHgtAboveMsl = 0; //nibble 25
-var nmeaDop = 0; //nibble 33
-var nmeaSatCount = 0; //nibble 41
-var nmeaFixQuality = 0; //nibble 49
-var sensorheight = 0; //nibble 57
-var bucketCount = 0; //nibble 65
-var buckets = ''; //nibble 73
+const NMEA_DEG_UNIT = 10000000;
+const NMEA_HGT_UNIT = 1000000;
+
+var response = '';
+var headers = '';
+var gpsTrace = false;
+var gpsVerbose = false;
+var msgTrace = false;
+var cmdTrace = false;
+var lat = 0;
+var lng = 0;
+var hgt = 0;
+var hgtAboveMsl = 0;
+var mslAboveWgs = 0;
+var dop = 0;
+var satCount = 0;
+var fixQuality = 0;
+var sensorHeight = 0;
+var bucketCount = 0;
+var buckets = '';
function hexToBit(iChar, iBit)
{
@@ -23,57 +27,66 @@
value >>= iBit;
return value & 1;
}
+function parseSint32fromHex(value)
+{
+ value = parseInt(value, 16);
+ if (value > 0x7FFFFFFF) value -= 0xFFFFFFFF;
+ return value;
+}
function parseAjax()
{
- gpsTrace = hexToBit(0, 0);
- gpsVerbose = hexToBit(0, 1);
- nmeaMsgTrace = hexToBit(0, 2);
- nmeaCmdTrace = hexToBit(0, 3);
- nmeaLat = parseInt(response.substr( 1, 8), 16);
- nmeaLng = parseInt(response.substr( 9, 8), 16);
- nmeaHgt = parseInt(response.substr(17, 8), 16);
- nmeaHgtAboveMsl = parseInt(response.substr(25, 8), 16);
- nmeaDop = parseInt(response.substr(33, 8), 16);
- nmeaSatCount = parseInt(response.substr(41, 8), 16);
- nmeaFixQuality = parseInt(response.substr(49, 8), 16);
- sensorheight = parseInt(response.substr(57, 8), 16);
- bucketCount = parseInt(response.substr(65, 8), 16);
- for(var i = 0; i < bucketCount; i++)
+ gpsTrace = hexToBit(0, 0);
+ gpsVerbose = hexToBit(0, 1);
+ msgTrace = hexToBit(0, 2);
+ cmdTrace = hexToBit(0, 3);
+ lat = parseSint32fromHex(response.substr( 1, 8));
+ lng = parseSint32fromHex(response.substr( 9, 8));
+ hgt = parseSint32fromHex(response.substr(17, 8));
+ hgtAboveMsl = parseSint32fromHex(response.substr(25, 8));
+ mslAboveWgs = parseSint32fromHex(response.substr(33, 8));
+ dop = parseSint32fromHex(response.substr(41, 8));
+ satCount = parseSint32fromHex(response.substr(49, 8));
+ fixQuality = parseSint32fromHex(response.substr(57, 8));
+ sensorHeight = parseSint32fromHex(response.substr(65, 8));
+ bucketCount = parseSint32fromHex(response.substr(73, 8));
+ buckets = '';
+ for (var i = 0; i < bucketCount; i++)
{
- buckets += i.padStart(2, '0') + ' ' + parseInt(response.substr(73 + i * 8, 8), 16) + '\r\n';
+ buckets += (i * 50).toString().padStart(3, '0') + ' ' + parseInt(response.substr(81 + i * 8, 8), 16) + '\r\n';
}
}
function degToString(plus, minus, deg)
{
- deg /= 10000000;
+ deg /= NMEA_DEG_UNIT;
if (deg >= 0) return plus + deg.toFixed(5);
else return minus + (-deg).toFixed(5);
}
function hgtToString(plus, minus, hgt)
{
- hgt /= 1000000;
- if (hgt >= 0) return plus + hgt.toFixed(5);
- else return minus + (-hgt).toFixed(5);
+ hgt /= NMEA_HGT_UNIT;
+ if (hgt >= 0) return plus + hgt.toFixed(1);
+ else return minus + (-hgt).toFixed(1);
}
function displayGeneral()
{
var elem;
- elem = document.getElementById('ajax-trace-gps' ); if (elem) elem.setAttribute('dir', gpsTrace ? 'rtl' : 'ltr');
- elem = document.getElementById('ajax-trace-verbose'); if (elem) elem.setAttribute('dir', gpsVerbose ? 'rtl' : 'ltr');
- elem = document.getElementById('ajax-trace-msg' ); if (elem) elem.setAttribute('dir', nmeaMsgTrace ? 'rtl' : 'ltr');
- elem = document.getElementById('ajax-trace-cmd' ); if (elem) elem.setAttribute('dir', nmeaCmdTrace ? 'rtl' : 'ltr');
+ elem = document.getElementById('ajax-trace-gps' ); if (elem) elem.setAttribute('dir', gpsTrace ? 'rtl' : 'ltr');
+ elem = document.getElementById('ajax-trace-verbose'); if (elem) elem.setAttribute('dir', gpsVerbose ? 'rtl' : 'ltr');
+ elem = document.getElementById('ajax-trace-msg' ); if (elem) elem.setAttribute('dir', msgTrace ? 'rtl' : 'ltr');
+ elem = document.getElementById('ajax-trace-cmd' ); if (elem) elem.setAttribute('dir', cmdTrace ? 'rtl' : 'ltr');
- elem = document.getElementById('ajax-position' ); if (elem) elem.textContent = degToString('N', 'S', nmeaLat) + ' ' +
- degToString('E', 'W', nmeaLng) + ' ' +
- hgtToString('H', 'D', nmeaHgt);
- elem = document.getElementById('ajax-hgt-above-msl'); if (elem) elem.textContent = hgtToString('H', 'D', nmeaHgtAboveMsl);
- elem = document.getElementById('ajax-gnd-above-msl'); if (elem) elem.textContent = hgtToString('H', 'D', nmeaHgtAboveMslAv - sensorHeight * NMEA_HGT_UNIT);
+ elem = document.getElementById('ajax-position' ); if (elem) elem.textContent = degToString('N', 'S', lat) + ' ' +
+ degToString('E', 'W', lng) + ' ' +
+ hgtToString('H', 'D', hgt);
+ elem = document.getElementById('ajax-msl-above-wgs'); if (elem) elem.textContent = hgtToString('H', 'D', mslAboveWgs);
+ elem = document.getElementById('ajax-hgt-above-msl'); if (elem) elem.textContent = hgtToString('H', 'D', hgtAboveMsl);
+ elem = document.getElementById('ajax-gnd-above-msl'); if (elem) elem.textContent = hgtToString('H', 'D', hgtAboveMsl - sensorHeight * NMEA_HGT_UNIT);
- elem = document.getElementById('ajax-dop' ); if (elem) elem.textContent = nmeaDop / 100;
- elem = document.getElementById('ajax-sat-count' ); if (elem) elem.textContent = nmeaSatCount;
- elem = document.getElementById('ajax-fix-quality' ); if (elem) elem.textContent = nmeaFixQuality;
+ elem = document.getElementById('ajax-dop' ); if (elem) elem.textContent = dop / 100;
+ elem = document.getElementById('ajax-sat-count' ); if (elem) elem.textContent = satCount;
+ elem = document.getElementById('ajax-fix-quality' ); if (elem) elem.textContent = fixQuality;
- elem = document.getElementById('ajax-sensor-hgt' ); if (elem) elem.value = sensorheight;
+ elem = document.getElementById('ajax-sensor-hgt' ); if (elem) elem.value = sensorHeight;
elem = document.getElementById('ajax-bucket-count' ); if (elem) elem.textContent = bucketCount;
elem = document.getElementById('ajax-buckets' ); if (elem) elem.textContent = buckets;