@iotize/tap
Version:
IoTize Device client for Javascript
541 lines (529 loc) • 23.9 kB
JavaScript
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@iotize/common/byte-stream'), require('@iotize/tap/client/impl')) :
typeof define === 'function' && define.amd ? define('@iotize/tap/target/can/dbc', ['exports', '@iotize/common/byte-stream', '@iotize/tap/client/impl'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory((global.iotize = global.iotize || {}, global.iotize.tap = global.iotize.tap || {}, global.iotize.tap.target = global.iotize.tap.target || {}, global.iotize.tap.target.can = global.iotize.tap.target.can || {}, global.iotize.tap.target.can.dbc = {}), global.byteStream, global.iotize.tap.client.impl));
})(this, (function (exports, byteStream, impl) { 'use strict';
/*! *****************************************************************************
Copyright (c) Microsoft Corporation.
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
***************************************************************************** */
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if (kind === "a" && !f)
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exports.CanSignal = void 0;
(function (CanSignal) {
var Endianess;
(function (Endianess) {
Endianess["BIG_ENDIAN"] = "BIG_ENDIAN";
Endianess["LITTLE_ENDIAN"] = "LITTLE_ENDIAN";
})(Endianess = CanSignal.Endianess || (CanSignal.Endianess = {}));
})(exports.CanSignal || (exports.CanSignal = {}));
var DBC_DATA_FRAME_LENGTH = 8;
function encodeCanMessage(input, signals) {
var e_1, _a;
var result = impl.TapStreamWriter.create(DBC_DATA_FRAME_LENGTH);
try {
for (var _b = __values(Object.entries(signals)), _c = _b.next(); !_c.done; _c = _b.next()) {
var _d = __read(_c.value, 2), attrName = _d[0], signal = _d[1];
// TODO improve exception with try catch to know with field fail
tapStreamWriteCanSignal(input[attrName], signal, result);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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finally { if (e_1) throw e_1.error; }
}
result.pos = DBC_DATA_FRAME_LENGTH;
return result.toBytes;
}
function decodeCanMessage(stream, signals) {
var e_2, _a;
if (stream instanceof Uint8Array) {
stream = new impl.TapStreamReader(stream);
}
var result = {};
try {
for (var _b = __values(Object.entries(signals)), _c = _b.next(); !_c.done; _c = _b.next()) {
var _d = __read(_c.value, 2), attrName = _d[0], signal = _d[1];
result[attrName] = tapStreamReadCanSignal(stream, signal);
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
}
finally { if (e_2) throw e_2.error; }
}
return result;
}
function dbcBitPositionToDataFrameIndex(start) {
var index = Math.abs((start % 8) - 7); // Equivalent de [-7, -5, -3, -1, 1, 3, 5, 7]
return start + (-7 + 2 * index);
}
function tapStreamReadCanSignal(stream, signal) {
var bitLength = signal.bitLength;
checkMaxLength(bitLength);
if (stream instanceof Uint8Array) {
stream = new impl.TapStreamReader(stream);
}
var result = readBitsFromDbcSignalStream(stream, signal);
return decodeSignalValueNumber(result, signal);
}
function readBitsFromDbcSignalStream(stream, _a) {
var endianess = _a.endianess, startBit = _a.startBit, bitLength = _a.bitLength;
var startIndex = dbcBitPositionToDataFrameIndex(startBit);
var result;
if (endianess === exports.CanSignal.Endianess.LITTLE_ENDIAN) {
result = 0 >>> 0;
for (var dbcPosition = startBit + bitLength - 1; dbcPosition >= startBit; dbcPosition--) {
var frameIndex = dbcBitPositionToDataFrameIndex(dbcPosition);
stream.setBitPosition(frameIndex);
result = result * 2 + stream.readBits(1);
}
}
else {
stream.pos = 0;
stream.forwardBits(startIndex);
result = stream.readBitsInt(bitLength);
}
return result;
}
function decodeSignalValueNumber(result, _a) {
var offset = _a.offset, scaling = _a.scaling, signed = _a.signed, length = _a.bitLength;
if (signed) {
result = fromSignedOnNBits(result, length);
}
if (scaling !== undefined) {
result = result * scaling;
}
if (offset !== undefined) {
result = result + offset;
}
return result;
}
function encodeSignalValueNumber(value, _a) {
var offset = _a.offset, scaling = _a.scaling, signed = _a.signed, length = _a.bitLength;
if (offset !== undefined) {
value = value - offset;
}
if (scaling !== 0 && scaling !== undefined) {
value = Math.round(value / scaling);
}
if (signed) {
value = toSignedOnNBits(value, length);
}
return value;
}
function tapStreamWriteCanSignal(value, signal, stream) {
var length = signal.bitLength;
checkMaxLength(length);
value = encodeSignalValueNumber(value, signal);
writeBitsToDbcMessageStream(stream, value, signal);
}
function writeBitsToDbcMessageStream(stream, value, _a) {
var endianess = _a.endianess, startBit = _a.startBit, bitLength = _a.bitLength;
if (endianess === exports.CanSignal.Endianess.LITTLE_ENDIAN) {
var mask = bitShift1(bitLength - 1);
for (var dbcPosition = startBit + bitLength - 1; dbcPosition >= startBit; dbcPosition--) {
var frameIndex = dbcBitPositionToDataFrameIndex(dbcPosition);
stream.setBitPosition(frameIndex);
var bitValue = byteStream.bitWiseAnd(value, mask);
stream.writeBoolean(bitValue, 1);
mask = mask / 2;
}
}
else {
var startIndex = dbcBitPositionToDataFrameIndex(startBit);
stream.pos = 0;
stream.forwardBits(startIndex);
stream.writeBits(value, bitLength);
}
}
function checkMaxLength(length) {
if (length > 52) {
// TODO proper error
throw new Error("CAN signal with bit length > 52 bits are not supported");
}
}
function fromSignedOnNBits(value, length) {
checkMaxLength(length);
var signedMask = bitShift1(length - 1);
var negative = byteStream.bitWiseAnd(value, signedMask) != 0;
if (negative) {
var valueMask = signedMask - 1;
var cp2 = byteStream.bitWiseAnd(valueMask, value);
return cp2 - signedMask;
}
else {
return value;
}
}
function toSignedOnNBits(value, length) {
checkMaxLength(length);
if (value < 0) {
if (value < -Math.pow(2, length)) {
throw new Error("Value " + value + " is too small to be encoded as a signed on " + length + " bits");
}
var signedMask = bitShift1(length - 1);
var valueMask = signedMask - 1;
var cp2 = byteStream.bitWiseAnd(valueMask, value >>> 0);
var result = byteStream.bitWiseOr(cp2, signedMask);
return result;
}
else {
if (value >= Math.pow(2, length)) {
throw new Error("Value " + value + " is too big to be encoded as a signed on " + length + " bits");
}
return value;
}
}
function bitShift1(size) {
return Math.pow(2, size);
}
var CanSignalStreamConverter = /** @class */ (function () {
function CanSignalStreamConverter(options) {
this.options = options;
}
CanSignalStreamConverter.prototype.encode = function (value, stream) {
tapStreamWriteCanSignal(value, this.options.signal, stream);
};
CanSignalStreamConverter.prototype.decode = function (value) {
return tapStreamReadCanSignal(value, this.options.signal);
};
return CanSignalStreamConverter;
}());
var CanMessageConverter = /** @class */ (function () {
function CanMessageConverter(options) {
this.options = options;
}
CanMessageConverter.prototype.encode = function (msg) {
return encodeCanMessage(msg, this.options.signals);
};
CanMessageConverter.prototype.decode = function (data) {
var stream = new impl.TapStreamReader(data);
return decodeCanMessage(stream, this.options.signals);
};
return CanMessageConverter;
}());
/**
* Generated bundle index. Do not edit.
*/
exports.CanMessageConverter = CanMessageConverter;
exports.CanSignalStreamConverter = CanSignalStreamConverter;
exports.decodeCanMessage = decodeCanMessage;
exports.encodeCanMessage = encodeCanMessage;
Object.defineProperty(exports, '__esModule', { value: true });
}));
//# sourceMappingURL=iotize-tap-target-can-dbc.umd.js.map