gd-ant-plus
Version:
A node module for ANT+ - forked from longhorn/ant-plus
176 lines • 7.54 kB
JavaScript
"use strict";
/*
* ANT+ profile: https://www.thisisant.com/developer/ant-plus/device-profiles/#521_tab
* Spec sheet: https://www.thisisant.com/resources/bicycle-power/
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.BicyclePowerScanner = exports.BicyclePowerSensor = void 0;
const Ant = require("./ant");
const Constants = Ant.Constants;
const Messages = Ant.Messages;
class BicyclePowerSensorState {
constructor(deviceID) {
this.offset = 0;
this.DeviceID = deviceID;
}
}
class BicyclePowerScanState extends BicyclePowerSensorState {
}
class BicyclePowerSensor extends Ant.AntPlusSensor {
constructor(stick) {
super(stick);
this.decodeDataCbk = this.decodeData.bind(this);
}
attach(channel, deviceID) {
super.attach(channel, 'receive', deviceID, BicyclePowerSensor.deviceType, 0, 255, 8182);
this.state = new BicyclePowerSensorState(deviceID);
}
decodeData(data) {
if (data.readUInt8(Messages.BUFFER_INDEX_CHANNEL_NUM) !== this.channel) {
return;
}
switch (data.readUInt8(Messages.BUFFER_INDEX_MSG_TYPE)) {
case Constants.MESSAGE_CHANNEL_BROADCAST_DATA:
case Constants.MESSAGE_CHANNEL_ACKNOWLEDGED_DATA:
case Constants.MESSAGE_CHANNEL_BURST_DATA:
if (this.deviceID === 0) {
this.write(Messages.requestMessage(this.channel, Constants.MESSAGE_CHANNEL_ID));
}
updateState(this, this.state, data);
break;
case Constants.MESSAGE_CHANNEL_ID:
this.deviceID = data.readUInt16LE(Messages.BUFFER_INDEX_MSG_DATA);
this.transmissionType = data.readUInt8(Messages.BUFFER_INDEX_MSG_DATA + 3);
this.state.DeviceID = this.deviceID;
break;
default:
break;
}
}
}
exports.BicyclePowerSensor = BicyclePowerSensor;
BicyclePowerSensor.deviceType = 0x0B;
class BicyclePowerScanner extends Ant.AntPlusScanner {
constructor(stick) {
super(stick);
this.states = {};
this.decodeDataCbk = this.decodeData.bind(this);
}
scan() {
super.scan('receive');
}
decodeData(data) {
if (data.length <= Messages.BUFFER_INDEX_EXT_MSG_BEGIN || !(data.readUInt8(Messages.BUFFER_INDEX_EXT_MSG_BEGIN) & 0x80)) {
console.log('wrong message format');
return;
}
const deviceId = data.readUInt16LE(Messages.BUFFER_INDEX_EXT_MSG_BEGIN + 1);
const deviceType = data.readUInt8(Messages.BUFFER_INDEX_EXT_MSG_BEGIN + 3);
if (deviceType !== BicyclePowerScanner.deviceType) {
return;
}
if (!this.states[deviceId]) {
this.states[deviceId] = new BicyclePowerScanState(deviceId);
}
if (data.readUInt8(Messages.BUFFER_INDEX_EXT_MSG_BEGIN) & 0x40) {
if (data.readUInt8(Messages.BUFFER_INDEX_EXT_MSG_BEGIN + 5) === 0x20) {
this.states[deviceId].Rssi = data.readInt8(Messages.BUFFER_INDEX_EXT_MSG_BEGIN + 6);
this.states[deviceId].Threshold = data.readInt8(Messages.BUFFER_INDEX_EXT_MSG_BEGIN + 7);
}
}
switch (data.readUInt8(Messages.BUFFER_INDEX_MSG_TYPE)) {
case Constants.MESSAGE_CHANNEL_BROADCAST_DATA:
case Constants.MESSAGE_CHANNEL_ACKNOWLEDGED_DATA:
case Constants.MESSAGE_CHANNEL_BURST_DATA:
updateState(this, this.states[deviceId], data);
break;
default:
break;
}
}
}
exports.BicyclePowerScanner = BicyclePowerScanner;
BicyclePowerScanner.deviceType = 0x0B;
function updateState(sensor, state, data) {
const page = data.readUInt8(Messages.BUFFER_INDEX_MSG_DATA);
switch (page) {
case 0x01: {
const calID = data.readUInt8(Messages.BUFFER_INDEX_MSG_DATA + 1);
if (calID === 0x10) {
const calParam = data.readUInt8(Messages.BUFFER_INDEX_MSG_DATA + 2);
if (calParam === 0x01) {
state.offset = data.readUInt16LE(Messages.BUFFER_INDEX_MSG_DATA + 6);
}
}
break;
}
case 0x10: {
const pedalPower = data.readUInt8(Messages.BUFFER_INDEX_MSG_DATA + 2);
if (pedalPower !== 0xFF) {
if (pedalPower & 0x80) {
state.PedalPower = pedalPower & 0x7F;
state.RightPedalPower = state.PedalPower;
state.LeftPedalPower = 100 - state.RightPedalPower;
}
else {
state.PedalPower = pedalPower & 0x7F;
state.RightPedalPower = undefined;
state.LeftPedalPower = undefined;
}
}
else {
state.PedalPower = undefined;
state.RightPedalPower = undefined;
state.LeftPedalPower = undefined;
}
const cadence = data.readUInt8(Messages.BUFFER_INDEX_MSG_DATA + 3);
if (cadence !== 0xFF) {
state.Cadence = cadence;
}
else {
state.Cadence = undefined;
}
state.AccumulatedPower = data.readUInt16LE(Messages.BUFFER_INDEX_MSG_DATA + 4);
state.Power = data.readUInt16LE(Messages.BUFFER_INDEX_MSG_DATA + 6);
break;
}
case 0x20: {
const oldEventCount = state.EventCount;
const oldTimeStamp = state.TimeStamp;
const oldTorqueTicksStamp = state.TorqueTicksStamp;
let eventCount = data.readUInt8(Messages.BUFFER_INDEX_MSG_DATA + 1);
const slope = data.readUInt16LE(Messages.BUFFER_INDEX_MSG_DATA + 3);
let timeStamp = data.readUInt16LE(Messages.BUFFER_INDEX_MSG_DATA + 5);
let torqueTicksStamp = data.readUInt16LE(Messages.BUFFER_INDEX_MSG_DATA + 7);
if (timeStamp !== oldTimeStamp && eventCount !== oldEventCount) {
state.EventCount = eventCount;
if (oldEventCount > eventCount) { //Hit rollover value
eventCount += 255;
}
state.TimeStamp = timeStamp;
if (oldTimeStamp > timeStamp) { //Hit rollover value
timeStamp += 65400;
}
state.Slope = slope;
state.TorqueTicksStamp = torqueTicksStamp;
if (oldTorqueTicksStamp > torqueTicksStamp) { //Hit rollover value
torqueTicksStamp += 65535;
}
const elapsedTime = (timeStamp - oldTimeStamp) * 0.0005;
const torqueTicks = torqueTicksStamp - oldTorqueTicksStamp;
const cadencePeriod = elapsedTime / (eventCount - oldEventCount); // s
const cadence = Math.round(60 / cadencePeriod); // rpm
state.CalculatedCadence = cadence;
const torqueFrequency = (1 / (elapsedTime / torqueTicks)) - state.offset; // Hz
const torque = torqueFrequency / (slope / 10); // Nm
state.CalculatedTorque = torque;
state.CalculatedPower = torque * cadence * Math.PI / 30; // Watts
}
break;
}
default:
return;
}
sensor.emit('powerData', state);
}
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