Add readonly to fields
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@@ -28,11 +28,11 @@ namespace WaveshareUARTFingerprintSensor
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private const byte PacketSeparator = 0xF5;
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private SerialPort _serialPort;
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private int _wakePinNumber;
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private int _rstPinNumber;
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private readonly int _wakePinNumber;
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private readonly int _rstPinNumber;
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private IGpioPin _wakePin;
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private IGpioPin _rstPin;
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private object _lock = new object();
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private readonly object _lock = new object();
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public FingerprintSensor(string portName, int wakePin = 23, int rstPin = 24)
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{
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