alarmParser.ts

const Alarms = [
  'Battery in Use',
  'Circuit Integrity Failed',
  'High Respiratory Rate',
  'High FiO2',
  'High PEEP',
  'High Plateau Pressure',
  'High Peak Pressure',
  'Low Inspiratory Pressure',
  'Low FiO2',
  'Low PEEP',
  'Low Plateau Pressure',
  'Oxygen Failure',
  'Low Tidal Volume',
  'High Tidal Volume',
  'Ventilation Active at Startup',
  'Low Minute Ventilation',
  'High Minute Ventilation',
  'Patient Vent Circuit Disconnected',
  'Mechanical Integrity Failed',
  'Homing not Done',
  '96 Hours of Operation',
  'Flow Sensor Disconnected',
  'Pressure Sensor Disconnected',
  'Oxygen Sensor Disconnected',
];


function getAlarmValues(serialData: Array<number>): Array<string> {
  let alarms: Array<string> = [];
  var bits = 8;
  var alarmIndices = [27, 41, 42];
  for (
    let alarmIndex = 0;
    alarmIndex < bits * alarmIndices.length;
    alarmIndex++
  ) {
    let alarmIndexToCheck = Math.floor(alarmIndex / bits);
    let valueByteToCheckIndex = alarmIndices[alarmIndexToCheck];
    let valueToCheck = serialData[valueByteToCheckIndex];
    let bitIndexToCheck = alarmIndex % bits;
    let isAlarmActive = getValueOfBit(valueToCheck, bitIndexToCheck);
    if (isAlarmActive) {
      alarms.push(Alarms[alarmIndex]);
    }
  }
  return alarms;
}

function getValueOfBit(valueToParse: number, bitIndex: number) {
  const bitIndexNumberForFindingValue = [1, 2, 4, 8, 16, 32, 64, 128];
  return valueToParse & bitIndexNumberForFindingValue[bitIndex];
}