New CSC sensor app, first commit

apps.json

@@ -2170,6 +2170,19 @@
     {"name":"tetra.stl","url":"tetra.stl"},
     {"name":"cube.stl","url":"cube.stl"},
     {"name":"icosa.stl","url":"icosa.stl"}
+   ]
+  },
+  { "id": "cscsensor",
+  "name": "Cycling speed sensor",
+  "shortName":"CSCSensor",
+  "icon": "icons8-cycling-48.png",
+  "version":"0.01",
+  "description": "Read BLE enabled cycling speed and cadence sensor and display readings on watch.",
+  "tags": "outdoors,exercise,ble,bluetooth",
+  "readme": "README.md",
+  "storage": [
+    {"name":"cscsensor.app.js","url":"cscsensor.app.js"},
+    {"name":"cscsensor.img","url":"cscsensor-icon.js","evaluate":true},
   ]
  },
  { "id": "worldclock",

apps/cycling/README.md

@@ -0,0 +1 @@
+TBD

apps/cycling/cscsensor-icon.js

@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwxH+AH4A/AH4A/AH/OAAIuuGFYuEGFQv/ADOlwV8wK/qwN8AAelGAguiFogACWsulFw6SERcwAFSISLnSMuAFZWCGENWllWLRSZC0vOAAovWmUslkyvbqJwIuHGC4uBAARiDdAwueL4YACMQLmfX5IAFqwwoMIowpMQ4wpGIcywDiYAA2IAAgwGq2kFwIvGC5YtPDJIuCF4gXPFxQHLF44XQFxAKOF4oXRBg4LOFwYvEEag7OBgReQNZzLNF5IXPBJlXq4vVC5Qv8R9TXQFwbvYJBgLlNbYXRBoYOEA44XfCAgAFCxgXYDI4VPC7IA/AH4A/AH4AWA"))

apps/cycling/cscsensor.apps.js

@@ -0,0 +1,84 @@
+
+var device;
+var gatt;
+var service;
+var characteristic;
+
+class CSCSensor {
+  constructor() {
+    this.lastTime = 0;
+    this.lastBangleTime = Date.now();
+    this.lastRevs = -1;
+    this.wheelDia = 28.0;
+    this.speedFailed = 0;
+    this.speed = 0;
+    this.lastSpeed = 0;
+    this.qUpdateScreen = true;
+  }
+
+  updateScreen() {
+    var dist = Math.round(100*this.lastRevs*this.wheelDia*Math.PI/63360.0)/100;
+    var dspeed = Math.round(10*this.speed)/10; 
+    g.clearRect(0, 120-2*20, 239, 120+2*20).drawString(dspeed+" mph", 120, 100).drawString(dist+" miles", 120, 140);
+    return;
+  }
+
+  updateSensor(event) {
+    var qChanged = false;
+    if (event.target.uuid == "0x2a5b") {
+      var wheelRevs = event.target.value.getUint32(1, true);
+      var dRevs = (this.lastRevs>0 ? wheelRevs-this.lastRevs : 0);
+      if (dRevs>0) qChanged = true;
+      this.lastRevs = wheelRevs;
+      var wheelTime = event.target.value.getUint16(5, true);
+      var dT = (wheelTime-this.lastTime)/1024;
+      var dBT = (Date.now()-this.lastBangleTime)/1000;
+      if (dT<0) dT+=64;
+      this.lastTime = wheelTime;
+      this.speed = this.lastSpeed;
+      if (dRevs>0 && dT>0) {
+        this.speed = (dRevs*this.wheelDia*Math.PI/63360.0)*3600/dT;
+	    this.speedFailed = 0;
+      }
+      else {
+    	this.speedFailed++;
+        qChanged = false;
+	    if (this.speedFailed>3) {  
+          this.speed = 0;
+	      qChanged = (this.lastSpeed>0);
+        }
+      }
+      this.lastSpeed = this.speed;
+    }
+    if (qChanged && this.qUpdateScreen) this.updateScreen();
+  }
+};
+
+var mySensor = new CSCSensor();
+
+function parseDevice(d) {
+  device = d;
+  g.clear().drawString("Found device", 120, 120).flip();
+  device.gatt.connect().then(function(ga) {
+  gatt = ga;
+  g.clear().drawString("Connected", 120, 120).flip();
+  return gatt.getPrimaryService("1816");
+}).then(function(s) {
+  service = s;
+  return service.getCharacteristic("2a5b");
+}).then(function(c) {
+  characteristic = c;
+  characteristic.on('characteristicvaluechanged', (event)=>mySensor.updateSensor(event));
+  return characteristic.startNotifications();
+}).then(function() {
+  console.log("Done!");
+  g.clear().setFontVector("40").setColor(1, 1, 1).flip();
+}).catch(function(e) {
+  g.clear().setColor(1, 0, 0).drawString("ERROR"+e, 120, 120).flip();
+})}
+
+NRF.setScan(parseDevice, { filters: [{services:["1816"]}], timeout: 2000});
+g.clear().setFontVector(18).setFontAlign(0, 0, 0).setColor(0, 1, 0);
+g.drawString("Scanning for CSC sensor...", 120, 120);
+
+Bangle.on('kill',()=>{ if (gatt!=undefined) gatt.disconnect()});