@signalk/nmea0183-signalk
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A node.js/javascript parser for NMEA0183 sentences. Sentences are parsed to Signal K format.
104 lines • 4.12 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"));
/*
26 04 XX XX YY YY DE Speed through water:
XXXX/100 Knots, sensor 1, current speed, valid if D&4=4
YYYY/100 Knots, average speed (trip/time) if D&8=0
or data from sensor 2 if D&8=8
E&1=1: Average speed calulation stopped
E&2=2: Display value in MPH
Corresponding NMEA sentence: VHW
*/
const S26 = function (input, _session) {
const { parts, tags } = input;
// E = parseInt(parts[6]!, 16) & 0x0f — not used currently; preserved in the
// spec comment above for reference.
const D = (parseInt(parts[6], 16) & 0xf0) >> 4;
const XXXX = parseInt(parts[2], 16) + 256 * parseInt(parts[3], 16);
const YYYY = parseInt(parts[4], 16) + 256 * parseInt(parts[5], 16);
const value1 = XXXX / 100.0;
const value2 = YYYY / 100.0;
const pathValues = [];
// Check if value1 is a valid speedThroughWater
if ((D & 4) == 4) {
var speedThroughWater = value1;
// Check if value2 is a valid speedThroughWater from sensor 2
/*
if ((D & 8)==8) {
// compute the speedThroughWater as the average between the two values
speedThroughWater=(value1+value2)/2
}
*/
pathValues.push({
path: 'navigation.speedThroughWater',
value: utils.transform(utils.float(speedThroughWater), 'knots', 'ms')
});
}
// Check if value2 is a valid averageSpeedThroughWater
if ((D & 8) == 0) {
pathValues.push({
path: 'navigation.averageSpeedThroughWater',
value: utils.transform(utils.float(value2), 'knots', 'ms')
});
}
return {
updates: [
{
source: tags.source,
timestamp: tags.timestamp,
values: pathValues
}
]
};
};
exports.default = S26;
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