waypointe

fallback to built in compass heading

apps/waypointer/ChangeLog

@@ -1,2 +1,3 @@
 0.01: New app!
 0.02: Make Bangle.js 2 compatible
+0.03: Silently use built in heading when no magnav calibration file is present

apps/waypointer/app.js

@@ -74,11 +74,14 @@ function newHeading(m,h){
     return hd;
 }
 
-var CALIBDATA = require("Storage").readJSON("magnav.json",1)||null;
+var CALIBDATA = require("Storage").readJSON("magnav.json",1) || {};
 
 function tiltfixread(O,S){
-  var start = Date.now();
   var m = Bangle.getCompass();
+  if (O === undefined || S === undefined) {
+    // no valid calibration from magnav, use built in
+    return 360-m.heading;
+  }
   var g = Bangle.getAccel();
   m.dx =(m.x-O.x)*S.x; m.dy=(m.y-O.y)*S.y; m.dz=(m.z-O.z)*S.z;
   var d = Math.atan2(-m.dx,m.dy)*180/Math.PI;
@@ -97,6 +100,7 @@ function tiltfixread(O,S){
 // Note actual mag is 360-m, error in firmware
 function read_compass() {
   var d = tiltfixread(CALIBDATA.offset,CALIBDATA.scale);
+  if (isNaN(d)) return; // built in compass heading can return NaN when uncalibrated
   heading = newHeading(d,heading);
   direction = wp_bearing - heading;
   if (direction < 0) direction += 360;

apps/waypointer/metadata.json

@@ -1,7 +1,7 @@
 {
   "id": "waypointer",
   "name": "Way Pointer",
-  "version": "0.02",
+  "version": "0.03",
   "description": "Navigate to a waypoint using the GPS for bearing and compass to point way, uses the same waypoint interface as GPS Navigation",
   "icon": "waypointer.png",
   "tags": "tool,outdoors,gps",

apps/waypointer/waypoints.html

@@ -73,8 +73,8 @@
         event.preventDefault()       
         var name = $name.value.trim()
         if(!name) return;
-        var lat = parseFloat($latitude.value).toPrecision(5);
+        var lat = parseFloat($latitude.value);
-        var lon = parseFloat($longtitude.value).toPrecision(5);
+        var lon = parseFloat($longtitude.value);
 
         waypoints.push({
           name, lat,lon,