@signalk/nmea0183-signalk
Version:
A node.js/javascript parser for NMEA0183 sentences. Sentences are parsed to Signal K format.
126 lines • 4.59 kB
JavaScript
;
/**
* Copyright 2016 Signal K <info@signalk.org> and contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
return ar;
};
return ownKeys(o);
};
return function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
__setModuleDefault(result, mod);
return result;
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
const utils = __importStar(require("@signalk/nmea0183-utilities"));
/*
******* 0 1 2 3 4
******* | | | | |
$--HDG,x.x,x.x,a,x.x,a*hh<CR><LF>
Field Number:
0 Magnetic Sensor heading in degrees
1 Magnetic Deviation, degrees
2 Magnetic Deviation direction, E = Easterly, W = Westerly
3 Magnetic Variation degrees
4 Magnetic Variation direction, E = Easterly, W = Westerly
*/
function isEmpty(mixed) {
if (typeof mixed === 'number') {
return false;
}
return typeof mixed !== 'string' || mixed.trim() === '';
}
const HDG = function (input, _session) {
const { parts, tags } = input;
const values = [];
const headingCompass = parts[0];
const deviation = parts[1];
const deviationDir = parts[2] === 'E' ? 1 : -1;
const variation = parts[3];
const variationDir = parts[4] === 'E' ? 1 : -1;
if (!isEmpty(headingCompass)) {
const effectiveDeviation = !isEmpty(deviation)
? Number(deviation) * deviationDir
: 0;
values.push({
path: 'navigation.headingMagnetic',
value: utils.transform(utils.float(headingCompass) + effectiveDeviation, 'deg', 'rad')
});
if (!isEmpty(deviation)) {
values.push({
path: 'navigation.headingCompass',
value: utils.transform(utils.float(headingCompass), 'deg', 'rad')
});
}
if (!isEmpty(variation)) {
const effectiveVariation = Number(variation) * variationDir;
values.push({
path: 'navigation.headingTrue',
value: utils.transform(utils.float(headingCompass) + effectiveDeviation + effectiveVariation, 'deg', 'rad')
});
}
}
if (!(isEmpty(variation) || isEmpty(variationDir))) {
values.push({
path: 'navigation.magneticVariation',
value: utils.transform(utils.float(variation), 'deg', 'rad') * variationDir
});
}
if (!(isEmpty(deviation) || isEmpty(deviationDir))) {
values.push({
path: 'navigation.magneticDeviation',
value: utils.transform(utils.float(deviation), 'deg', 'rad') * deviationDir
});
}
if (!values.length) {
return null;
}
const delta = {
updates: [
{
source: tags.source,
timestamp: tags.timestamp,
values
}
]
};
return delta;
};
exports.default = HDG;
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