| public Wait ( int &transferredCount ) : ErrorCode | ||
| transferredCount | int | The number of bytes transferred on |
| return | ErrorCode | |
internal static ErrorCode SyncTransfer(UsbTransfer transferContext,
IntPtr buffer,
int offset,
int length,
int timeout,
int isoPacketSize,
out int transferLength)
{
if (ReferenceEquals(transferContext, null))
{
throw new NullReferenceException("Invalid transfer context.");
}
if (offset < 0)
{
throw new ArgumentException("must be >=0", "offset");
}
if (isoPacketSize == 0 && transferContext.EndpointBase.Type == EndpointType.Isochronous)
{
Info.UsbEndpointInfo endpointInfo = transferContext.EndpointBase.EndpointInfo;
if (endpointInfo != null)
{
isoPacketSize = endpointInfo.Descriptor.MaxPacketSize;
}
}
lock (transferContext.mTransferLOCK)
{
transferLength = 0;
int transferred;
ErrorCode ec;
transferContext.Fill(buffer, offset, length, timeout, isoPacketSize);
while (true)
{
ec = transferContext.Submit();
if (ec != ErrorCode.Success)
{
return(ec);
}
ec = transferContext.Wait(out transferred);
if (ec != ErrorCode.Success)
{
return(ec);
}
transferLength += transferred;
if ((ec != ErrorCode.None || transferred != UsbEndpointBase.MaxReadWrite) ||
!transferContext.IncrementTransfer(transferred))
{
break;
}
}
return(ec);
}
}
internal static ErrorCode SyncTransfer(UsbTransfer transferContext,
IntPtr buffer,
int offset,
int length,
int timeout,
int isoPacketSize,
out int transferLength)
{
if (ReferenceEquals(transferContext, null)) throw new NullReferenceException("Invalid transfer context.");
if (offset < 0) throw new ArgumentException("must be >=0", "offset");
if (isoPacketSize == 0 && transferContext.EndpointBase.Type == EndpointType.Isochronous)
{
Info.UsbEndpointInfo endpointInfo = transferContext.EndpointBase.EndpointInfo;
if (endpointInfo!=null)
isoPacketSize = endpointInfo.Descriptor.MaxPacketSize;
}
lock (transferContext.mTransferLOCK)
{
transferLength = 0;
int transferred;
ErrorCode ec;
transferContext.Fill(buffer, offset, length, timeout, isoPacketSize);
while (true)
{
ec = transferContext.Submit();
if (ec != ErrorCode.Success) return ec;
ec = transferContext.Wait(out transferred);
if (ec != ErrorCode.Success) return ec;
transferLength += transferred;
if ((ec != ErrorCode.None || transferred != UsbEndpointBase.MaxReadWrite) ||
!transferContext.IncrementTransfer(transferred))
break;
}
return ec;
}
}