private byte[] ReadPassiveTargetId(byte baudrate, int timeout)
{
byte[] packet =
{
CommandInlistpassivetarget,
1, // Activate only one target (max 2)
baudrate
};
if (!SendCommandCheckAck(packet, timeout))
{
return(null);
}
var response = ReadData(20);
if (response[7] != 1)
{
return(null);
}
DebugOnly.Print("Tag found!");
var uid = new byte[response[12]];
for (uint i = 0; i < response[12]; i++)
{
uid[i] = response[13 + i];
}
DebugOnly.Print("UID:");
DebugOnly.PrintByteArray(uid);
return(uid);
}
private void WriteCommand(byte[] cmd)
{
var cmdlen = (uint)cmd.Length + 1;
// Compute checksum
var checksum = Preamble + Preamble + Startcode + HostToPn532;
for (uint i = 0; i < cmdlen - 1; i++)
{
checksum += cmd[i];
}
byte[] writeHeader =
{
SpiDatawrite,
Preamble,
Preamble,
Startcode,
(byte)cmdlen,
(byte)(~cmdlen + 1),
HostToPn532
};
byte[] writeFooter =
{
(byte)~checksum,
Postamble
};
// Create write array
var write = Utility.CombineArrays(writeHeader, cmd);
write = Utility.CombineArrays(write, writeFooter);
write = Common.ReverseBit(write);
spi.Write(write);
// Debug informations
DebugOnly.Print("\nSending command: ");
DebugOnly.PrintByteArray(write);
}
// LOW LEVEL COMM
private byte[] ReadData(int n)
{
var read = new byte[n + 1];
byte[] write = { SpiDataread };
write = Utility.CombineArrays(write, Common.CreateNullPayload(n));
write = Common.ReverseBit(write);
spi.WriteRead(write, read);
read = Utility.ExtractRangeFromArray(read, 1, n);
read = Common.ReverseBit(read);
// Debug informations
DebugOnly.Print("\nReading response: ");
DebugOnly.PrintByteArray(read);
return(read);
}