public int InputDataProcess(byte[] data)
{
while (Interlocked.CompareExchange(ref rLock, 1, 0) == 0)
{
Thread.SpinWait(1);
}
#region write data to ring
for (int i = 0; i < data.Length; i++)
{
ring[wPos] = data[i];
wPos = (wPos + 1) % rSize;
rCnt++;
}
#endregion
bool isStep = false;
bool isEmpty = false;
while (!isEmpty)
{
#region look for a packet start
bool isPacketStart = false;
while ((rCnt >= uMCPInoPacket.MIN_SIZE) && (!isPacketStart))
{
if (ring[rPos] == uMCPIno.SIGN)
{
isPacketStart = true;
}
else
{
rPos = (rPos + 1) % rSize;
rCnt--;
}
}
#endregion
if (isPacketStart)
{
#region try to parse
int rPosCache = rPos;
int rCntCache = rCnt;
RingReadByte(rPosCache, rCntCache, out rPosCache, out rCntCache); // skip SIGN
uMCPInoPacketType pType = (uMCPInoPacketType)RingReadByte(rPosCache, rCntCache, out rPosCache, out rCntCache);
if (pType != uMCPInoPacketType.INVALID)
{
rPosCache = rPos;
rCntCache = rCnt;
if (rCntCache >= uMCPIno.HSIZE)
{
#region read header & its CRC
var packet = RingRead(rPosCache, rCntCache, uMCPIno.HSIZE, out rPosCache, out rCntCache);
byte declaredPacketCRC = packet[packet.Length - 1];
byte actualPacketCRC = CRC.CRC8_Get(packet, 0, packet.Length - 1);
#endregion
if (declaredPacketCRC == actualPacketCRC)
{
#region if ctrl header CRC is OK
#region decode control header
byte trcnt = packet[uMCPInoPacket.TRCNT_OFFSET];
byte tcnt = Convert.ToByte((trcnt >> 4) & 0x0F);
byte rcnt = Convert.ToByte(trcnt & 0x0F);
#endregion
if ((pType != uMCPInoPacketType.DTA) && (pType != uMCPInoPacketType.DTE))
{
isStep = true;
packets.Add(new uMCPInoCTRLPacket(pType, tcnt, rcnt));
}
else
{
#region DTA & DTE
// try to get dcnt
if (rCntCache > 1)
{
byte actualDBlockCRC = 0xFF;
byte dcnt = RingReadByte(rPosCache, rCntCache, out rPosCache, out rCntCache);
if (dcnt >= 1)
{
actualDBlockCRC = CRC.CRC8_Update(dcnt, actualDBlockCRC);
if (rCntCache >= dcnt + 1)
{
var dataBlock = RingRead(rPosCache, rCntCache, dcnt, out rPosCache, out rCntCache);
actualDBlockCRC = CRC.CRC8_Update(dataBlock, 0, dataBlock.Length, actualDBlockCRC);
byte declaredDBlockCRC = RingReadByte(rPosCache, rCntCache, out rPosCache, out rCntCache);
if (declaredDBlockCRC == actualDBlockCRC)
{
packets.Add(new uMCPInoDATAPacket(tcnt, rcnt, dataBlock, (pType == uMCPInoPacketType.DTE)));
}
isStep = true; // even if bad crc
}
else
{
// wait for data...
isEmpty = true;
}
}
else
{
// bad data block, use only header
isStep = true;
packets.Add(new uMCPInoCTRLPacket(uMCPInoPacketType.ACK, tcnt, rcnt));
}
}
else
{
// wait for data...
isEmpty = true;
}
#endregion
}
#endregion
}
else
{
// bad crc, just skip it
isStep = true;
}
}
else
{
// leave, wait for data
isEmpty = true;
}
}
else
{
// bad or not a packet, skip
isStep = true;
}
if (isStep)
{
rPos = rPosCache;
rCnt = rCntCache;
}
#endregion
}
else
{
// no packet start found
isEmpty = true;
}
} // while (!isEmpty)...
Interlocked.Decrement(ref rLock);
return(packets.Count);
}