private bool initPort(UartSpeed speed)
{
try
{
// Let's initialize the port with highest possible bandwidth
MifareResponse request = sendInitRequest(speed);
if (request.Response != Response.OK)
{
return(false);
}
// Let's find out what hardware we're dealing with
MifareDeviceResponse deviceModeResponse = sendReadDeviceMode();
if (deviceModeResponse.Response != Response.OK)
{
return(false);
}
Console.WriteLine("Communicating with device name {0}", deviceModeResponse.DeviceName);
// Turn LED off so we can actively use it to give visual feedback
//Console.WriteLine (sendLedRequest (LEDColor.ALL_LED_OFF));
//Console.WriteLine ();
sendLedRequest(LEDColor.BLUE_ON_RED_OFF);
Thread.Sleep(500);
sendLedRequest(LEDColor.ALL_LED_OFF);
return(true);
}
catch (System.TimeoutException exception)
{
return(false);
}
}
private MifareResponse sendInitRequest(UartSpeed speed)
{
byte[] readBuffer = new byte[64];
int offset = 0;
int bytesToRead = 0;
int retryCount = 0;
do
{
if (retryCount++ == INIT_REQUEST_RETRY_COUNT)
{
throw new Exception("Failed at establishting connection!");
}
WriteCommand(Command.INIT_PORT, NODE_BROADCAST, (byte)speed);
Thread.Sleep(50);
bytesToRead = port.BytesToRead;
} while (bytesToRead == 0);
Console.WriteLine("Connection established after " + retryCount + " attempts!");
// TODO: Use callback, make response parser able to read lazily from input stream
int bytesRead = port.Read(readBuffer, offset, bytesToRead);
// Evaluate data in buffer
//Console.WriteLine ();
//Console.WriteLine ("Received: {0} ( {1} bytes)", readBuffer.Subset (0, offset).ToHex (), offset);
MifareResponse response = new MifareResponse();
//ushort magic = readBuffer.Subset (0, 2).ToUInt16 ();
//Console.WriteLine ("Magic: {0} ( {1})", magic, readBuffer.Subset (0, 2).ToHex ());
ushort length = readBuffer.Subset(2, 2).ToUInt16();
//Console.WriteLine ("Length: {0} ( {1})", length, readBuffer.Subset (2, 2).ToHex ());
ushort nodeID = readBuffer.Subset(4, 2).ToUInt16();
//Console.WriteLine ("NodeID: {0} ( {1})", nodeID, readBuffer.Subset (4, 2).ToHex ());
response.NodeId = nodeID;
ushort commandCode = readBuffer.Subset(6, 2).ToUInt16();
//Console.WriteLine ("Command: {0} ( {1})", Enum.GetName (typeof(CommandCode), commandCode), readBuffer.Subset (6, 2).ToHex ());
response.Command = (Command)commandCode;
byte responseCode = readBuffer[8];
//Console.WriteLine ("Response Code: {0} ( {1})", Enum.GetName (typeof(ResponseCode), responseCode), responseCode.ToHex ());
response.Response = (Response)responseCode;
//byte checksum = readBuffer [readBuffer.Length-1];
byte checksum = readBuffer[4 + length];
//Console.WriteLine ("XOR: {0} ( {1})", checksum, checksum.ToHex ());
byte calculatedChecksum = CalcCheckSum(readBuffer, 4, 3 + length);
//Console.WriteLine ("XOR match: {0} ( {1})", calculatedChecksum, calculatedChecksum.ToHex ());
validateChecksum(checksum, calculatedChecksum);
return(response);
}
