public BCCentralManager(string serialPath)
{
SerialPath = serialPath ?? throw new ArgumentNullException(nameof(serialPath));
// Hookup serial protocol
_protocol = new SerialProtocol();
_protocol.CommandResponseReceived += (sender, responsePdu) => _responsePdu = responsePdu;
_protocol.EventReceived += (sender, eventPdu) => _eventPdu = eventPdu;
_protocol.ProtocolError += (sender, error) => _protocolError = error;
}
private bool CheckForResponse(out CommandResponsePdu responsePdu)
{
if (_responsePdu == null)
{
responsePdu = null;
return(false);
}
responsePdu = _responsePdu;
_responsePdu = null;
return(true);
}
public void Parse(byte ch)
{
if (_pduBufPos >= PDU_BUF_SIZE)
{
_pduBufPos = 0;
}
//-----------------
// Parse PDU_TYPE
//-----------------
// check packet position
if (_pduBufPos == 0)
{
// beginning of packet, check for correct framing/expected byte(s)
// Packet must be either Command/Response (0x00) or Event (0x80)
if ((ch & 0x7F) == 0x00)
{
// store new character in RX buffer
_rxPduBuf[_pduBufPos++] = ch;
}
}
else
{
_rxPduBuf[_pduBufPos++] = ch;
if (_pduBufPos == (PDU_HDR_POS_CLS_ID + 1))
{
//------------
// Parse CLSID
//------------
if (_rxPduBuf[PDU_HDR_POS_CLS_ID] != (byte)ClassId.BlueCats)
{
if ((_rxPduBuf[PDU_HDR_POS_CLS_ID] & 0x7F) == 0x00)
{
_rxPduBuf[0] = _rxPduBuf[PDU_HDR_POS_CLS_ID];
_pduBufPos = 1;
}
else
{
_pduBufPos = 0; // bad sync, reset pdu buffer
}
}
}
//-----------------
// Parse PAY_LEN
//-----------------
else if (_pduBufPos == (PDU_HDR_POS_PAY_LEN + 1))
{
_pduPayLen = ch;
}
else if (_pduBufPos >= PDU_HDR_LEN)
{
//-----------------------------
// Parse header CRC8 and verify
//-----------------------------
if (_pduBufPos == PDU_HDR_LEN)
{
// check pdu header crc8
byte hdrCrc8 = Crc8(_rxPduBuf, 0, PDU_HDR_LEN - 1);
if (hdrCrc8 != _rxPduBuf[PDU_HDR_POS_CRC8])
{
_pduBufPos = 0; // crc failed, reset pdu buffer
var errMsg = $"Header CRC8 does not match (calculated: 0x{hdrCrc8:2X}, given: 0x{_rxPduBuf[ PDU_HDR_POS_CRC8 ]:2X}";
ProtocolError?.Invoke(this, errMsg);
}
}
//---------------------
// Full packet received
//---------------------
if (_pduBufPos == (_pduPayLen + PDU_HDR_LEN))
{
// just received last expected byte, reset pdu buffer
_pduBufPos = 0;
//------------------------------
// Parse payload CRC8 and verify
//------------------------------
if (_pduPayLen > 0)
{
// check pdu payload crc8
byte payCrc8 = Crc8(_rxPduBuf, PDU_PAY_POS, _pduPayLen);
if (payCrc8 != _rxPduBuf[PDU_HDR_POS_PAY_CRC8])
{
var errMsg = $"Header CRC8 does not match (calculated: 0x{payCrc8:X2}, given: 0x{_rxPduBuf[ PDU_HDR_POS_CRC8 ]:X2})";
ProtocolError?.Invoke(this, errMsg);
return;
}
}
//-----------
// Handle RSP
//-----------
if (_rxPduBuf[PDU_HDR_POS_PDU_TYPE] == (byte)PduType.Command)
{
if (_pduPayLen <= 0)
{
_pduBufPos = 0; // reset pdu buffer
ProtocolError?.Invoke(this, "Missing response code for response");
}
var payloadBytes = _rxPduBuf.Take(_pduPayLen + PDU_HDR_LEN).ToArray();
var pdu = CommandResponsePdu.FromByteArray(payloadBytes);
CommandResponseReceived?.Invoke(this, pdu);
}
//-----------
// Handle EVT
//-----------
else if (_rxPduBuf[PDU_HDR_POS_PDU_TYPE] == (byte)PduType.Event)
{
var payloadBytes = _rxPduBuf.Take(_pduPayLen + PDU_HDR_LEN).ToArray();
var pdu = EventPdu.FromByteArray(payloadBytes);
EventReceived?.Invoke(this, pdu);
}
}
}
}
}
