//==============================================================================================
/// <summary>
/// Synchronizes access to the bulk in ready buffers queue
/// </summary>
/// <param name="bulkInBuffer">The buffer to queue</param>
/// <param name="queueAction">The actions to take (enqueue or dequeue)</param>
/// <returns>The buffer that was dequeued</returns>
//==============================================================================================
internal BulkInBuffer QueueBulkInReadyBuffers(BulkInBuffer bulkInBuffer, QueueAction queueAction)
{
lock (m_bulkInReadyBuffersLock)
{
if (queueAction == QueueAction.Enqueue)
{
m_bulkInReadyBuffers.Enqueue(bulkInBuffer);
return null;
}
else
{
if (m_bulkInReadyBuffers.Count > 0)
{
return m_bulkInReadyBuffers.Dequeue();
}
else
{
return null;
}
}
}
}
//============================================================================================== /// <summary> /// Virtual method for a USB Bulk IN request /// </summary> /// <param name="buffer">The buffer to receive the data</param> /// <param name="bytesReceived">The number of actual bytes received</param> /// <returns>The result</returns> //============================================================================================== internal abstract ErrorCodes UsbBulkInRequest(ref BulkInBuffer buffer, ref uint bytesReceived);
//==============================================================================================
/// <summary>
/// Synchronizes access to the bulk in completed buffers queue
/// </summary>
/// <param name="bulkInBuffer">The buffer to queue</param>
/// <param name="queueAction">The actions to take (enqueue or dequeue)</param>
/// <returns>The buffer that was dequeued</returns>
//==============================================================================================
internal BulkInBuffer QueueBulkInCompletedBuffers(BulkInBuffer bulkInBuffer, QueueAction queueAction)
{
lock (m_bulkInCompletedBuffersLock)
{
try
{
if (queueAction == QueueAction.Enqueue)
{
m_bulkInCompletedBuffers.Enqueue(bulkInBuffer);
return null;
}
else
{
if (m_bulkInCompletedBuffers.Count > 0)
{
return m_bulkInCompletedBuffers.Dequeue();
}
else
{
return null;
}
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.Assert(false, ex.Message);
return null;
}
}
}
//==============================================================================================
/// <summary>
/// Virtual method for a USB Bulk IN request
/// </summary>
/// <param name="buffer">The buffer to receive the data</param>
/// <param name="bytesRequested">The number of bytes to requested</param>
/// <param name="bytesReceived">The number of actual bytes received</param>
/// <returns>The result</returns>
//==============================================================================================
internal override ErrorCodes UsbBulkInRequest(ref BulkInBuffer buffer, ref uint bytesReceived)
{
ErrorCodes result;
BulkInBuffer bulkInBuffer = null;
do
{
result = m_inputScanErrorCode;
if (result != ErrorCodes.NoErrors)
break;
bulkInBuffer = QueueBulkInCompletedBuffers(null, QueueAction.Dequeue);
if (bulkInBuffer == null)
Thread.Sleep(1);
} while (bulkInBuffer == null && !m_stopInputTransfers);
if (bulkInBuffer != null)
{
buffer = bulkInBuffer;
bytesReceived = (uint)bulkInBuffer.Length;
}
else
{
buffer = null;
bytesReceived = 0;
}
return result;
}
//=============================================================================================================
/// <summary>
/// Sets up parameters for bulk in transfers
/// </summary>
/// <param name="scanRate">The device scan rate</param>
/// <param name="totalNumberOfBytes">The total number of bytes to transfer</param>
/// <param name="transferSize">The number of bytes in each transfer request</param>
//=============================================================================================================
internal override void PrepareInputTransfers(double scanRate, int totalNumberOfBytes, int transferSize)
{
m_errorCode = ErrorCodes.NoErrors;
m_expectedInputTransferIndex = 0;
m_totalNumberOfInputBytesRequested = totalNumberOfBytes;
m_completedBulkInRequestBuffers.Clear();
//For the 1208FS/1408FS, packets get mixed up at high rates in SINGLEIO mode. So,
// only allow 1 packet to be in process
int maxWorkingInputRequests = (transferSize==2 ? 2 : 8);
if (m_criticalParams.InputSampleMode == SampleMode.Finite)
{
m_numberOfWorkingInputRequests = Math.Min(maxWorkingInputRequests, Math.Max(1, totalNumberOfBytes / transferSize));
m_numberOfQueuedInputRequests = Math.Max(1, m_numberOfWorkingInputRequests / 2);
}
else
{
m_numberOfWorkingInputRequests = maxWorkingInputRequests;
m_numberOfQueuedInputRequests = Math.Max(1,maxWorkingInputRequests/2);
}
if (m_criticalParams.InputTransferMode == TransferMode.SingleIO)
{
int byteRatio = m_criticalParams.DataInXferSize;
// for single io mode at higher rates the packets could get out of order between the kernel driver
// and user mode so only use one request buffer...
m_numberOfWorkingInputRequests = 1;
m_numberOfQueuedInputRequests = 1;
m_totalNumberOfInputRequests = totalNumberOfBytes / (byteRatio * m_criticalParams.NumberOfSamplesForSingleIO);
}
else
{
if (totalNumberOfBytes <= transferSize)
m_totalNumberOfInputRequests = 1;
else
m_totalNumberOfInputRequests = (int)Math.Ceiling((double)totalNumberOfBytes / (double)transferSize);
}
// the device will send a zero-length packet after the last data packet if
// the number of bytes is a multiple of the packet size so add an extra request (or is it the transfer size)
//if ((totalNumberOfBytes % m_criticalParams.InputPacketSize == 0) ||
// (m_criticalParams.InputTransferMode == TransferMode.SingleIO && m_criticalParams.Requires0LengthPacketForSingleIO))
//{
// m_totalNumberOfInputRequests++;
// if (m_numberOfWorkingInputRequests == 1)// && m_criticalParams.NumberOfSamplesForSingleIO > 1)
// m_numberOfWorkingInputRequests++;
//}
m_stopInputTransfers = false;
int numberOfBulkInCopyBuffers = 50;
// empty the bulkInReadyBuffers queue
while (m_bulkInReadyBuffers.Count > 0)
{
BulkInBuffer buffer = m_bulkInReadyBuffers.Dequeue();
new WeakReference(buffer, false);
buffer = null;
}
// empty the bulkInCompletedBuffers queue
while (m_bulkInCompletedBuffers.Count > 0)
{
BulkInBuffer buffer = m_bulkInCompletedBuffers.Dequeue();
new WeakReference(buffer, false);
buffer = null;
}
//GC.Collect();
for (int i = 0; i < numberOfBulkInCopyBuffers; i++)
{
QueueBulkInReadyBuffers(new BulkInBuffer(transferSize), QueueAction.Enqueue);
}
// create the holding queue base on the number of working requests...
m_holdingBuffer = new BulkInBuffer[m_numberOfWorkingInputRequests];
for (int i = 0; i < m_numberOfWorkingInputRequests; i++)
{
// initialize to null...
m_holdingBuffer[i] = null;
}
m_temporaryBuffer = new List<BulkInBuffer>();
// create the bulk in request objects that will be used in the transfers...
CreateBulkInputRequestObjects(transferSize);
// reset the sumbitted and completed counts...
m_numberOfInputRequestsSubmitted = 0;
m_numberOfInputRequestsCompleted = 0;
// queue bulk in requests - at this point the device has not yet started..
QueueBulkInRequests(scanRate);
}
//=============================================================================================================
/// <summary>
/// Virtual method for a USB Bulk IN request
/// </summary>
/// <param name="buffer">The buffer to receive the data</param>
/// <param name="bytesRequested">The number of bytes to requested</param>
/// <param name="bytesReceived">The number of actual bytes received</param>
/// <returns>The result</returns>
//=============================================================================================================
internal override ErrorCodes UsbBulkInRequest(ref BulkInBuffer buffer, ref uint bytesReceived)
{
System.Diagnostics.Debug.Assert(false, "UsbBulkInRequest must be implemented in a derived class");
buffer = null;
bytesReceived = 0;
return ErrorCodes.MethodRequiresImplementation;
}
//====================================================================
/// <summary>
/// Processes bulk read requests for input scan on a separate thread
/// This method will copy bulk in request buffers to an internal
/// managed buffer or an extenral unmanaged buffer
/// </summary>
//====================================================================
protected void ProcessInputScanThread()
{
System.Diagnostics.Debug.Assert(m_criticalParams.BulkInXferSize != 0);
bool usingInternalBuffer = true;
//if (m_onAcquisitionArmedCallbackControl != null)
// m_onAcquisitionArmedCallback = new CallbackDelegate(m_onAcquisitionArmedCallbackControl.NotifyApplication);
if (m_onDataAvailableCallbackControl != null)
m_onDataAvailableCallback = new CallbackDelegate(m_onDataAvailableCallbackControl.NotifyApplication);
if (m_onInputScanCompleteCallbackControl != null)
m_onInputScanCompleteCallback = new CallbackDelegate(m_onInputScanCompleteCallbackControl.NotifyApplication);
if (m_onInputScanErrorCallbackControl != null)
m_onInputScanErrorCallback = new CallbackDelegate(m_onInputScanErrorCallbackControl.NotifyApplication);
int triggerRearmByteCount = 0;
int readBufferLength;
int callbackCount = 0;
int rearmTriggerCount = 0;
m_availableSamplesForCallbackSinceStartOfScan = 0;
m_terminateCallbacks = false;
m_totalBytesReceived = 0;
if (m_onDataAvailableCallbackControl != null || m_onInputScanErrorCallbackControl != null || m_onInputScanCompleteCallbackControl != null)
{
TerminateCallbacks = false;
// the other callback controls may be instantiated but this may not be...
if (m_onDataAvailableCallbackControl != null)
{
m_onDataAvailableCallbackControl.Abort = false;
}
// start the callback thread...
m_callbackThread = new Thread(new ThreadStart(ProcessCallbackThread));
m_callbackThread.Name = "[DAQFlex]: InputScanCallbackThread";
m_callbackThread.Start();
}
unsafe
{
if (m_externalReadBuffer != null)
usingInternalBuffer = false;
}
// get the buffer size that the platform interop object calculates from the scan rate
int optimalBufferSize = m_criticalParams.BulkInXferSize;
int channelCount = m_criticalParams.AiChannelCount;
m_totalBytesToRead = channelCount * (m_criticalParams.DataInXferSize * m_criticalParams.InputScanSamples);
if (m_criticalParams.InputSampleMode == SampleMode.Continuous && !m_inputBufferSizeOverride)
m_internalReadBuffer = new byte[2 * m_totalBytesToRead];
if (usingInternalBuffer)
readBufferLength = m_internalReadBuffer.Length;
else
readBufferLength = m_externalReadBufferSize;
if (m_totalBytesToRead < optimalBufferSize)
{
optimalBufferSize = m_totalBytesToRead;
m_criticalParams.BulkInXferSize = optimalBufferSize;
}
// give the device an opportunity to do device-specific stuff before starting
m_daqDevice.BeginInputScan();
if (m_criticalParams.InputTransferMode == TransferMode.SingleIO)
{
// single sample only
optimalBufferSize = m_criticalParams.DataInXferSize * m_criticalParams.NumberOfSamplesForSingleIO;
m_criticalParams.BulkInXferSize = optimalBufferSize;
}
if (m_onDataAvailableCallbackControl != null)
{
// update the bulk transfer size so it closely matches the number of call back samples...
optimalBufferSize = GetOptimalInputBufferSize(m_criticalParams.InputScanRate);
}
// the platform interop object will allocate and return the bulk read buffer
m_bulkReadBuffer = null;
//// give the device an opportunity to do device-specific stuff before starting
//m_daqDevice.BeginInputScan();
// this will queue one or more bulk in requests if the interop object supports asynchronous I/O
m_platformInterop.PrepareInputTransfers(m_criticalParams.InputScanRate,
m_totalBytesToRead,
optimalBufferSize);
//// were ready to send the start command so raise the acqusition armed event
//if (m_onAcquisitionArmedCallbackControl != null && m_onAcquisitionArmedCallbackControl.Created)
//{
// AcquisitionInfo acquisitionInfo = new AcquisitionInfo();
// acquisitionInfo.AiQueueEnabled = m_criticalParams.AiQueueEnabled;
// acquisitionInfo.AiScans = (optimalBufferSize / channelCount / sizeof(double));
// acquisitionInfo.InputScanRate = m_criticalParams.InputScanRate;
// acquisitionInfo.IsAiDataCalibrated = m_criticalParams.CalibrateAiData;
// if (m_onAcquisitionArmedCallbackControl.ExecuteOnUIThread)
// {
// m_acquisitionArmedCallbackParam[0] = acquisitionInfo;
// m_onAcquisitionArmedCallbackControl.BeginInvoke(m_onAcquisitionArmedCallback, m_acquisitionArmedCallbackParam);
// }
// else
// {
// m_acquisitionArmedCallbackParam[0] = acquisitionInfo;
// m_onAcquisitionArmedCallbackControl.NotifyApplication((int)m_acquisitionArmedCallbackParam[0]);
// }
//}
// this will start the device scan
TransmitDeferredInputMessages();
int numberOfBulkTransfersToExecute;
uint bytesReceivedInCurrentTransfer = 0;
uint totalBytesTransfered = 0;
uint bytesToTransfer = 0;
int deltaBytes = 0;
while (ContinueProcessingInputScan(m_inputScanErrorCode))
{
bytesReceivedInCurrentTransfer = 0;
totalBytesTransfered = 0;
bytesToTransfer = 0;
m_inputScanStatus = ScanState.Running;
// if the bulk read buffer length is greater than the max transfer size, then we'll need multiple transfers
numberOfBulkTransfersToExecute = (int)Math.Ceiling((double)optimalBufferSize / (double)m_platformInterop.MaxTransferSize);
for (int i = 0; i < numberOfBulkTransfersToExecute; i++)
{
// calculate the number of bytes to process in this transfer
if (m_criticalParams.InputTransferMode == TransferMode.SingleIO)
bytesToTransfer = (uint)(m_criticalParams.DataInXferSize * m_criticalParams.NumberOfSamplesForSingleIO);
else
bytesToTransfer = (uint)Math.Min(optimalBufferSize, (m_totalBytesToRead - (int)totalBytesTransfered));
// if the input scan is finite then check if this is the last transfer
if (m_criticalParams.InputSampleMode == SampleMode.Finite)
{
if (m_lastInputScanWriteIndex + bytesToTransfer > readBufferLength)
bytesToTransfer = (uint)(readBufferLength - m_lastInputScanWriteIndex) - 1;
}
//*********************************************************************************************************
// Read the data on the bulk in pipe
//*********************************************************************************************************
m_inputScanErrorCode = m_platformInterop.UsbBulkInRequest(ref m_bulkReadBuffer, ref bytesReceivedInCurrentTransfer);
// update the total number of bytes received
m_totalBytesReceived += (ulong)bytesReceivedInCurrentTransfer;
// m_bulkInReadBuffer could be null if the input scan was stopped with the Stop command
if (m_inputScanErrorCode == (int)ErrorCodes.NoErrors && m_bulkReadBuffer != null)
{
// update the total number of bytes transfered so far
totalBytesTransfered += bytesReceivedInCurrentTransfer;
try
{
if (m_criticalParams.DeltaRearmInputSamples > 0)
{
triggerRearmByteCount += (int)bytesToTransfer;
if (triggerRearmByteCount >= (m_criticalParams.DataInXferSize * channelCount * m_criticalParams.AdjustedRearmSamplesPerTrigger))
{
rearmTriggerCount++;
bytesToTransfer -= (uint)(m_criticalParams.DataInXferSize * channelCount * m_criticalParams.DeltaRearmInputSamples);
m_totalBytesReceived -= (ulong)(m_criticalParams.DataInXferSize * channelCount * m_criticalParams.DeltaRearmInputSamples);
triggerRearmByteCount = 0;
}
}
// upate the number of samples acquired so far per channel
lock (m_inputScanCountLock)
{
m_inputScanCount = (m_totalBytesReceived / (ulong)m_criticalParams.DataInXferSize) / (ulong)channelCount;
if (m_criticalParams.InputScanOverwrite)
{
deltaBytes = m_criticalParams.DataInXferSize * (int)(m_inputScanCount - m_inputSamplesReadPerChannel);
if (deltaBytes > readBufferLength)
{
m_inputScanErrorCode = ErrorCodes.InputBufferOverrun;
continue;
}
}
}
if (m_criticalParams.InputTransferMode == TransferMode.SingleIO)
callbackCount += ((int)bytesReceivedInCurrentTransfer / m_criticalParams.DataInXferSize) / m_criticalParams.NumberOfSamplesForSingleIO;
else
callbackCount += ((int)bytesReceivedInCurrentTransfer / m_criticalParams.DataInXferSize) / channelCount;
if (usingInternalBuffer)
{
int bytesToCopyOnFirstPass;
int bytesToCopyOnSecondPass;
if (m_lastInputScanWriteIndex + bytesToTransfer >= readBufferLength)
{
// two passes are required since the current input scan write index
// wrapped around to the beginning of the internal read buffer
bytesToCopyOnFirstPass = readBufferLength - (m_lastInputScanWriteIndex + 1);
bytesToCopyOnSecondPass = (int)bytesToTransfer - bytesToCopyOnFirstPass;
m_inputBufferFilled = true;
}
else
{
// only one pass is required since the current input scan write index
// did not wrap around
bytesToCopyOnFirstPass = (int)bytesToTransfer;
bytesToCopyOnSecondPass = 0;
}
CopyToInternalReadBuffer(m_bulkReadBuffer.Data,
m_internalReadBuffer,
bytesToCopyOnFirstPass,
bytesToCopyOnSecondPass);
}
else
{
unsafe
{
CopyToExternalReadBuffer(m_bulkReadBuffer.Data,
m_externalReadBuffer,
readBufferLength,
bytesToTransfer);
}
}
// calculate current index (some devices in SINGLEIO mode only transfer one channel per packet and the second calculation will always return 0)
if (m_criticalParams.InputTransferMode == TransferMode.SingleIO)
m_inputScanIndex = (long)Math.Max(0, (m_inputScanCount % (ulong)(readBufferLength / m_criticalParams.DataInXferSize)) - 1);
else
m_inputScanIndex = (long)Math.Max(0, (m_inputScanCount % (ulong)(readBufferLength / m_criticalParams.DataInXferSize)) - (ulong)channelCount);
// add the m_bulkReadBuffer to the ready buffers queue so it may be reused
m_platformInterop.QueueBulkInReadyBuffers(m_bulkReadBuffer, QueueAction.Enqueue);
}
catch (Exception ex)
{
System.Diagnostics.Debug.Assert(false, ex.Message);
m_inputScanErrorCode = ErrorCodes.UnknownError;
}
//*****************************************************************************************
// OnDataAvailable callback
//*****************************************************************************************
if (m_inputScanErrorCode == ErrorCodes.NoErrors)
{
if (m_onDataAvailableCallbackControl != null && m_onDataAvailableCallbackControl.Created)
{
if (m_criticalParams.InputSampleMode == SampleMode.Finite)
{
if (m_totalBytesReceived >= (ulong)m_totalBytesToRead && m_totalBytesReceived > 0)
TerminateCallbacks = true;
}
}
}
}
}
//*****************************************************************************************
// OnInputScanError callback
//*****************************************************************************************
if (m_inputScanErrorCode != ErrorCodes.NoErrors)
{
m_callbackInfoQueue.Clear();
TerminateCallbacks = true;
}
Thread.Sleep(0);
}
while (!m_platformInterop.InputScanComplete())
Thread.Sleep(0);
DebugLogger.WriteLine("Input scan complete");
DebugLogger.StopWatch.Stop();
//DebugLogger.DumpDebugInfo();
if (m_inputScanErrorCode == ErrorCodes.DataOverrun)
m_inputScanStatus = ScanState.Overrun;
else
m_inputScanStatus = ScanState.Idle;
m_inputScanComplete = true;
m_inputScanStarted = false;
// give the device an opportunity to do device-specific stuff before stopping
// THIS MUST BE DONE AFTER m_inputScanStatus HAS BEEN SET
m_daqDevice.EndInputScan();
if (m_callbackThread != null)
{
// was a stop message sent?...
if (m_stopInputScan)
{
// Does the callback thread know to terminate?...
if (!TerminateCallbacks)
{
// Let it know...
TerminateCallbacks = true;
}
}
}
m_errorCode = m_inputScanErrorCode;
// set the DaqDevice's pending error so that it can handle it on the next message sent...
if (m_errorCode != ErrorCodes.NoErrors && m_errorCode != ErrorCodes.DataOverrun)
{
m_daqDevice.SetPendingInputScanError(m_errorCode);
}
}