forked from FOSS/BangleApps
106 lines
3.0 KiB
JavaScript
106 lines
3.0 KiB
JavaScript
var decoded;
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var gatt;
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function decode(d) {
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var value = d.getUint16(4,1);
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if (value&32768)
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value = -(value&32767);
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var flags = d.getUint8(0);
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var flags2 = d.getUint8(1);
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// mv dc 27,240 "11xxx"
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// mv ac 95,240 "1011xxx"
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// v dc 36,240 "100xxx" 36(2dp) 35(20dp)
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// v ac 100,240 "1100xxx" 100(2dp) 99(20dp) 97(2000dp)
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// ohms 55,241 "110xxx"
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// beep 231,242 "11100xxx"
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// diode 167,242 "10100xxx"
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// capac 76,241 "1001xxx"
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// hz 162,241 "10100xxx"
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// temp 33,242 "100xxx"
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// ncv 96,243 "1100xxx"
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// uA 146,240 "10010xxx"
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// ma 155,240 "10011xxx"
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// A 163,240 "10100xxx"
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var dp = flags&7;
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var range = (flags>>3)&7;
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value *= Math.pow(10, -dp);
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var isAC = !!(flags&64);
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var mode = "?", units = "";
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if (flags2==240) {
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if (flags&128) {
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mode = "current";
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units = ["","nA","uA","mA","A","kA","MA",""][range];
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} else {
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mode = "voltage";
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units = ["","nV","uV","mV","V","kV","MV",""][range] + " " + (isAC?"AC":"DC");
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}
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} else if (flags2==241) {
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if (isAC) {
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mode = "capacitance";
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units = ["","nF","uF","mF","F","kF","MF",""][range];
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} else if (flags&128) {
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mode = "frequency";
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units = "Hz";
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} else {
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mode = "resistance";
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units = ["","nOhm","uOhm","mOhm","Ohm","kOhm","MOhm",""][range];
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}
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} else if (flags2==242) {
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if (flags&128) mode = isAC ? "continuity" : "diode";
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else {
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mode = "temperature";
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units = isAC ? "F" : "C";
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}
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} else if (flags2==243) mode = "ncv";
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//console.log(mode+" "+value+" "+units,new Uint8Array(d.buffer).slice());
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decoded = {
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value : value,
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mode : mode, // current/voltage/capacitance/frequency/resistance/temperature
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units : units, // eg 'mA'
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raw : new Uint8Array(d.buffer).slice(),
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};
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updateDisplay(decoded);
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}
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function updateDisplay(d) {
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var mode = d.mode;
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mode = mode.substr(0,1).toUpperCase()+mode.substr(1);
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var s = d.value.toString();
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var R = Bangle.appRect;
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g.reset().clearRect(R);
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g.setFont("12x20").setFontAlign(-1,-1).drawString(mode, R.x, R.y);
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g.setFont("12x20").setFontAlign(1,1).drawString(d.units, R.x+R.w-1, R.y+R.h-1);
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var fontSize = 80;
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g.setFont("Vector",fontSize).setFontAlign(0,0);
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while (g.stringWidth(s) > R.w-20) {
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fontSize -= 2;
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g.setFont("Vector", fontSize);
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}
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g.drawString(s, R.x+R.w/2, R.y+R.h/2);
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}
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Bangle.loadWidgets();
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Bangle.drawWidgets();
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E.showMessage(/*LANG*/"Connecting...");
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NRF.requestDevice({ filters: [{ name: 'BDM' }] }).then(function(device) {
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return device.gatt.connect();
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}).then(function(g) {
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gatt = g;
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return gatt.getPrimaryService(0xFFF0);
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}).then(function(service) {
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return service.getCharacteristic(0xFFF4);
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}).then(function(c) {
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c.on('characteristicvaluechanged', function(event) {
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d = event.target.value;
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decode(d);
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});
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return c.startNotifications();
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}).then(function() {
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E.showMessage(/*LANG*/"Connected.");
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}).catch(function(e) {
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E.showMessage(e.toString());
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});
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