Hi everyone,
I'm using CyUSB .NET DLL to interact with a device that contains a FX2 chip. The device continuosly sends data upstream through endpoint 6, which I am continuosly polling from a dedicated thread to fetch and process the afore mentioned data.The problem is that when I use the synchronous methods BeginDataXfer( ), WaitForXfer( ) and FinishDataXfer( ) after a while .NET Framworks throws a FatalExecutionEngineError exception. The thread's code is shown bellow:
inEP = myCyDevice.EndPointOf(0x86) as CyBulkEndPoint;
int BufSz = inEP.MaxPktSize * 245;
int QueueSz = 6;
inEP.XferSize = BufSz;
while (canContinue)
{
byte[][] cmdBufs = new byte[QueueSz][];
byte[][] xferBufs = new byte[QueueSz][];
byte[][] ovLaps = new byte[QueueSz][];
unsafe
{
for (int i = 0; i < QueueSz; i++)
{
cmdBufs = new byte[CyConst.SINGLE_XFER_LEN];
xferBufs = new byte[BufSz];
ovLaps = new byte[CyConst.OverlapSignalAllocSize];
fixed (byte* tmp0 = ovLaps)
{
OVERLAPPED* ovLapStatus = (OVERLAPPED*)tmp0;
ovLapStatus->hEvent = PInvoke.CreateEvent(0, 0, 0, 0);
}
}
int len = BufSz;
for (int i = 0; i < QueueSz; i++)
inEP.BeginDataXfer(ref cmdBufs, ref xferBufs, ref len, ref ovLaps);
int failures = 0;
for (int i = 0; i < QueueSz; i++)
{
fixed (byte* tmp0 = ovLaps)
{
OVERLAPPED* ovLapStatus = (OVERLAPPED*)tmp0;
if (!inEP.WaitForXfer(ovLapStatus->hEvent, 500))
{
inEP.Abort();
PInvoke.WaitForSingleObject(ovLapStatus->hEvent, CyConst.INFINITE);
}
}
if (inEP.FinishDataXfer(ref cmdBufs, ref xferBufs, ref len, ref ovLaps))
chunks.Process(xferBufs);
else
failures++;
}
}
}
The problem goes away if I use synchronous XferData( ) instead, but this method is not enought for the bandwidth requirements.
