/*
* This constructor takes string, read from file /sys/bus/w1/devices/<sensor ID>/w1_slave,
* that contains measured data
* If data are valid, measurement is initialized by contents of this string
*/
public DS18B20Measurement(SensorDS18B20 sensor, String measurement, DateTime timestamp)
{
//TODO make it a constant or something like that
String MessageFormatOfFormatException = "Received incorrect text data from sensor. {0}";
//TODO verify sensor use 12-bit resolution
/*
* Example of w1_slave file contents in case of successful sensor read
*
* 50 05 ff ff f0 ff ff ff 5c : crc=5c YES
* 50 05 ff ff f0 ff ff ff 5c t=85000
*
* First line ending with “YES” – which means no errors.
* The second line ending with “t=” followed by the temperature in thousandths of degrees Celsius (°C * 1000)
*
* The power-on reset value of the temperature register is +85°C.
* .
*/
if (measurement == forbiddenMeasurement)
{
throw new FormatException(String.Format(MessageFormatOfFormatException, "Measurement file is corrupted."));
}
String[] lines = measurement.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
if (lines.Length != 2)
{
throw new FormatException(String.Format(MessageFormatOfFormatException, "Line quantity is wrong."));
}
if (!lines[0].Contains("YES"))
{
throw new FormatException(String.Format(MessageFormatOfFormatException, "CRC checksum do not match."));
}
String temp_str = lines[1].Split(new string[] { "t=" }, StringSplitOptions.RemoveEmptyEntries)[1];
//TODO number in text file is always an integer number. So using Int32.Parse may be a better alternative
Double temp;
if (!Double.TryParse(temp_str, out temp))
{
throw new FormatException(String.Format(MessageFormatOfFormatException, "Temperature is not in valid number format."));
}
Sensor = sensor;
Value = temp / 1000;
Timestamp = timestamp;
}
public DS18B20Measurement(SensorDS18B20 sensor, Double temperature, DateTime timestamp)
: base(sensor, temperature, timestamp)
{
}
//TODO use abstract Sensor class in this constructor
public Measurement(SensorDS18B20 sensor, Double value, DateTime timestamp)
{
Sensor = sensor;
Value = value;
Timestamp = timestamp;
}