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 bool SendCommandCheckAck(byte[] cmd, int timeout = 1000)
{
// Write the command
WriteCommand(cmd);
// Wait for chip to say its ready!
if (!WaitReady(timeout))
{
notifyError();
return(false);
}
// Read acknowledgement
if (!ReadAck())
{
DebugOnly.Print("No ACK frame received!");
notifyError();
return(false);
}
// Remove error block
errorNotified = false;
DebugOnly.Print("PN532 acknowledged the command!");
return(true);
}
/// <summary>Initializes NFC module</summary>
public bool Init()
{
DebugOnly.Print("Starting NFC module...");
// This is needed for synchronization
byte[] packet = { CommandGetfirmwareversion };
SendCommandCheckAck(packet);
// Wait some time
Thread.Sleep(1000);
// Configure safe access manager
if (SamConfig())
{
return(false);
}
return(false);
}
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);
}
private bool WaitReady(int timeout)
{
uint timer = 0;
while (!IsReady())
{
if (timeout != 0)
{
timer += 10;
if (timer > timeout)
{
DebugOnly.Print("ERROR: No response from PN532!");
return(false);
}
}
Thread.Sleep(10);
}
DebugOnly.Print("PN532 is READY!");
return(true);
}
/// <summary>Returns current firmware version</summary>
public uint GetFirmwareVersion()
{
// Request firmware version
byte[] packet = { CommandGetfirmwareversion };
if (!SendCommandCheckAck(packet))
{
return(0);
}
// Read response
var response = ReadData(12);
// Extract firmware version
var header = Utility.ExtractRangeFromArray(response, 0, 6);
if (!Common.CompareByteArray(header, FvHead))
{
DebugOnly.Print("Response is not firmware!");
}
var version = (Utility.ExtractValueFromArray(response, 6, 4) >> 8) & 0xFF;
return(version);
}
