mirror of https://github.com/espruino/BangleApps
89 lines
2.9 KiB
JavaScript
89 lines
2.9 KiB
JavaScript
{
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let log = function() {};//print
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let gatt;
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Bangle.enableBTHRMLog = function() {
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log = print;
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};
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Bangle.setHRMPower = function(isOn, app) {
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// Do app power handling
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if (!app) app="?";
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log("setHRMPower ->", isOn, app);
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if (Bangle._PWR===undefined) Bangle._PWR={};
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if (Bangle._PWR.HRM===undefined) Bangle._PWR.HRM=[];
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if (isOn && !Bangle._PWR.HRM.includes(app)) Bangle._PWR.HRM.push(app);
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if (!isOn && Bangle._PWR.HRM.includes(app)) Bangle._PWR.HRM = Bangle._PWR.HRM.filter(a=>a!=app);
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isOn = Bangle._PWR.HRM.length;
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// so now we know if we're really on
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if (isOn) {
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log("setHRMPower on", app);
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if (!gatt) {
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log("HRM not already on");
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NRF.requestDevice({ filters: [{ services: ['180D'] }] }).then(function(device) {
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log("Found device "+device.id);
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device.on('gattserverdisconnected', function(reason) {
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gatt = undefined;
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});
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return device.gatt.connect();
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}).then(function(g) {
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log("Connected");
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gatt = g;
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return gatt.getPrimaryService(0x180D);
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}).then(function(service) {
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return service.getCharacteristic(0x2A37);
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}).then(function(characteristic) {
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log("Got characteristic");
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characteristic.on('characteristicvaluechanged', function(event) {
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var dv = event.target.value;
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var flags = dv.getUint8(0);
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// 0 = 8 or 16 bit
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// 1,2 = sensor contact
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// 3 = energy expended shown
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// 4 = RR interval
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var bpm = (flags&1) ? (dv.getUint16(1)/100/* ? */) : dv.getUint8(1); // 8 or 16 bit
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/* var idx = 2 + (flags&1); // index of next field
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if (flags&8) idx += 2; // energy expended
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if (flags&16) {
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var interval = dv.getUint16(idx,1); // in milliseconds
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}*/
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Bangle.emit('HRM',{
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bpm:bpm,
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confidence:100
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});
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});
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return characteristic.startNotifications();
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}).then(function() {
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log("Ready");
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console.log("Done!");
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}).catch(function(err) {
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console.log("BTHRM Error",err);
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gatt = undefined;
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// retry connection if we got a connect timeout
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if (err == "Connection Timeout")
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setTimeout(Bangle.setHRMPower, 1000, isOn, app);
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});
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}
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} else { // not on
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log("setHRMPower off", app);
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if (gatt) {
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log("HRM connected - disconnecting");
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try {gatt.disconnect();}catch(e) {
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log("HRM disconnect error", e);
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}
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gatt = undefined;
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}
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}
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};
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// disconnect when swapping apps
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E.on("kill", function() {
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if (gatt) {
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log("HRM connected - disconnecting");
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try {gatt.disconnect();}catch(e) {
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log("HRM disconnect error", e);
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}
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gatt = undefined;
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}
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});
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} |