@jbroll/nmea-simple
Version:
NMEA 0183 sentence parser and encoder
67 lines (66 loc) • 2.45 kB
JavaScript
;
/*
* === VTG - Track made good and ground speed ===
*
* ------------------------------------------------------------------------------
* 1 2 3 4 5 6 7 8 9 10
* | | | | | | | | | |
* $--VTG,xxx.x,T,xxx.x,M,x.x,N,x.x,K,m,*hh<CR><LF>
* ------------------------------------------------------------------------------
*
* Field Number:
*
* 1. Track Degrees
* 2. T = True
* 3. Track Degrees
* 4. M = Magnetic
* 5. Speed Knots
* 6. N = Knots
* 7. Speed Kilometers Per Hour
* 8. K = Kilometers Per Hour
* 9. FAA mode indicator (NMEA 2.3 and later)
* 10. Checksum
*/
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
var helpers_1 = require("../helpers");
var PacketStub_1 = require("./PacketStub");
exports.sentenceId = "VTG";
exports.sentenceName = "Track made good and ground speed";
function decodeSentence(stub, fields) {
return __assign(__assign({}, PacketStub_1.initStubFields(stub, exports.sentenceId, exports.sentenceName)), { trackTrue: helpers_1.parseFloatSafe(fields[1]), trackMagnetic: helpers_1.parseFloatSafe(fields[3]), speedKnots: helpers_1.parseFloatSafe(fields[5]), speedKmph: helpers_1.parseFloatSafe(fields[7]), faaMode: fields[9] });
}
exports.decodeSentence = decodeSentence;
function encodePacket(packet, talker) {
var result = ["$" + talker + exports.sentenceId];
result.push(helpers_1.encodeDegrees(packet.trackTrue));
result.push("T");
result.push(helpers_1.encodeDegrees(packet.trackMagnetic));
result.push("M");
result.push(helpers_1.encodeFixed(packet.speedKnots, 2));
result.push("N");
if (packet.speedKmph) {
result.push(helpers_1.encodeFixed(packet.speedKmph, 2));
result.push("K");
}
else {
result.push("");
result.push("");
}
if (packet.faaMode) {
result.push(packet.faaMode);
}
var resultWithoutChecksum = result.join(",");
return resultWithoutChecksum + helpers_1.createNmeaChecksumFooter(resultWithoutChecksum);
}
exports.encodePacket = encodePacket;