Function parse

app/rcc/scripts/parser/js/nmea_2000.js:195–223

* Parses an NMEA 2000 CAN frame into the predefined array structure. * * NMEA 2000 frame structure (assuming preprocessed CAN frame): * Bytes 0-3: CAN ID (29-bit extended, contains PGN) * Byte 4: Data length (0-8) * Bytes 5-12: Data payload (up to 8 bytes) * * How it works: * 1. E

(frame)

 * @returns {array} Array of values mapped according to pgnToIndexMap
 */
function parse(frame) {
  if (frame.length < 6)
    return parsedValues;

  var canId      = frame[0] | (frame[1] << 8) | (frame[2] << 16) | (frame[3] << 24);
  var dataLength = Math.min(frame[4], 8);

  var data = [];
  for (var i = 0; i < dataLength && (5 + i) < frame.length; i++)
    data.push(frame[5 + i]);

  var pgn = extractPGN(canId);

  if (!pgnToIndexMap.hasOwnProperty(pgn))
    return parsedValues;

  var config = pgnToIndexMap[pgn];

  try {
    var values = config.parser(data);
    for (var i = 0; i < values.length && i < config.indices.length; i++)
      parsedValues[config.indices[i]] = values[i];
  }
  catch (e) {
    console.error("NMEA 2000 parsing error:", e.message);
  }

  return parsedValues;
}