/// <summary>
/// /// Constructor. Sets the class GUID, product & vendor id.
/// Predefined values are in DeviceManagerProp.cs.
/// </summary>
public EPdeviceManager(UInt16 vendor_id, UInt16 product_id)
{
UsbNotifications = new UsbDevice();
WinUsbNotifications = new WinUsbDevice();
EPdevicesVM = new ObservableCollection<GENdeviceVM>();
_EPdevices = new Collection<GENdevice>();
if (vendor_id != 0)
VENDOR_ID = vendor_id;
if (product_id != 0)
PRODUCT_ID = product_id;
}
/// <summary>
/// Reads data from the ADS1298 device and produces data frames to be sent live to clients.
/// </summary>
internal void ReadDataLive()
{
const UInt32 maxBufferSize = 62208; // Optimal buffer value
const UInt32 maxBufferDelay = 15; // Maximum buffer delay in milliseconds
UInt32 bufferSize;
UInt32 bytesRead = 0;
UInt32 sampleFreq;
UInt32 frameCounter = 0; // frame sequence number relative to the beginning of the data acquisition
UInt32 frameDiff; // Difference to calculate the frames in the current package
UInt32 nPackets = 0; //Debug variable to show the numbers of frames generated
Byte[] readBuffer;
Byte[] writeBuffer = new Byte[USB_PACKET_SIZE];
Boolean success = false, sendSuccess = true;
// Select a optimal buffer size (not extending the consts above)
WinUsbDevice myWinUsb = new WinUsbDevice();
Stopwatch myStopwatch = new Stopwatch();
long ticksBegin, ticksEnd;
double timeStamp, timeDelta;
sampleFreq = (UInt32)(HR ? DR_VALUE_HR : DR_VALUE_LP);
//bufferSize = (UInt32)((sampleFreq * DATALENGTH * (UInt32)((myWinUsb.pipeTimeout<maxBufferDelay) ? myWinUsb.pipeTimeout : maxBufferDelay )* 0.75) / 1000);
//The buffer size is solely determined by the maximum buffer delay that we choose to allow.
bufferSize = (UInt32) (DATALENGTH * sampleFreq * maxBufferDelay / 1000);
bufferSize = bufferSize > maxBufferSize ? maxBufferSize : bufferSize;
readBuffer = new Byte[bufferSize];
_packetQueue = new System.Collections.Concurrent.ConcurrentQueue<RawDataPacket>();
RawDataPacket finalPacket;
try
{
winUsbDev.FlushPipe(PIPE_DATA_IN);
// Send start-command to ADS device.
writeBuffer[0] = CMD_START;
success = winUsbDev.SendBulkData(PIPE_COMMAND_OUT, ref writeBuffer, (UInt32)writeBuffer.Length); // Send start-command to ADS device.
if (success)
{
myStopwatch.Reset();
myStopwatch.Start();
do
{
// Read some data.
ticksBegin = myStopwatch.ElapsedTicks;
winUsbDev.ReadBulkData(PIPE_DATA_IN, bufferSize, ref readBuffer, ref bytesRead, ref success);
ticksEnd = myStopwatch.ElapsedTicks;
timeStamp = (double)ticksBegin / (double)Stopwatch.Frequency;
timeDelta = (double)(ticksEnd - ticksBegin) / (double)Stopwatch.Frequency;
// Get a proper frame index for our newly read frames
// This frame index is 24-bit wide, so at 2000 samples/sec it will
// overflow and get back to 0 every 8388 seconds
frameDiff=0;
for (UInt32 i = 0; i < bytesRead; i += DATALENGTH)
{
frameCounter = frameCounter & 0x00ffffff;
readBuffer[i] = (Byte) ((frameCounter & 0x00ff0000) >> 16);
readBuffer[i+1] = (Byte) ((frameCounter & 0x0000ff00) >> 8);
readBuffer[i+2] = (Byte) (frameCounter & 0x000000ff);
frameCounter++;
frameDiff++;
}
//Here we can create a packet and add it to the frame collection
_packetQueue.Enqueue(new RawDataPacket(readBuffer, (Int32)bytesRead, sampleFreq, NumberOfChannels, DATALENGTH, frameDiff, timeStamp, timeDelta));
nPackets++;
//We have read a new packet, so we make our listeners aware of it
OnNewPacket(EventArgs.Empty);
sendSuccess &= success;
}
while (processingData && bytesRead != 0);
//Now we send a special duplicate packet indicating there will be no more packets coming
finalPacket=new RawDataPacket(readBuffer, (Int32)bytesRead, sampleFreq, NumberOfChannels, DATALENGTH, frameDiff,timeStamp,timeDelta);
finalPacket.lastPacket = true;
_packetQueue.Enqueue(finalPacket);
OnNewPacket(EventArgs.Empty);
//DEBUG
Console.Out.WriteLine("{0} packets processed.", nPackets);
//DEBUG/
}
if (sendSuccess)
{
writeBuffer[0] = CMD_STOP;
success = winUsbDev.SendBulkData(PIPE_COMMAND_OUT, ref writeBuffer, (UInt32)writeBuffer.Length); // Send stop-command to ADS device.
}
}
catch (ThreadAbortException)
{
throw;
}
finally
{
writeBuffer[0] = CMD_STOP;
winUsbDev.SendBulkData(PIPE_COMMAND_OUT, ref writeBuffer, (UInt32)writeBuffer.Length); // Send stop-command to ADS device.
winUsbDev.ReadBulkData(PIPE_DATA_IN, bufferSize, ref readBuffer, ref bytesRead, ref success); // Read the samples after we stopped the reading process.
}
}
/*
/// <summary>
/// Save data from EP device.
/// </summary>
internal override void SaveData(HDF5group hdf5device)
{
Int32 rec, data;
float[] fWriteBuffer;
byte[] readBuffer = new byte[DATALENGTH];
Int32[] iWriteBuffer;
UInt64 counter = 0;
UInt64[] counterBuffer = new UInt64[1];
// Write raw data to file.
if (hdf5device != null) rec = hdf5device.addRecord("EMG RAW", NumberOfChannels, SamplesPerSecond, HDF5group.DataType.INT32, HDF5group.CompressionType.GZIP, 9);
else rec = 0;
if (memStream != null)
{
memStream.Position = 0;
while (memStream.Read(readBuffer, 0, DATALENGTH) == DATALENGTH)
{
iWriteBuffer = new Int32[8];
for (UInt32 i = SampleLength, j = 0; i < DATALENGTH; i += SampleLength, j++)
{
iWriteBuffer[j] = readBuffer[i] << 24 | readBuffer[i + 1] << 16 | readBuffer[i + 2] << 8;
iWriteBuffer[j] /= 256;
}
if (hdf5device != null) hdf5device.getRecord(rec).writeData<Int32>(iWriteBuffer);
}
}
// Write attributes
if (hdf5device != null)
{
hdf5device.getRecord(rec).writeAttribute("Manufacturer", winUsbDev.GetUsbStringDescriptor(winUsbDev.usbDevDescriptor.iManufacturer));
hdf5device.getRecord(rec).writeAttribute("Device name", winUsbDev.GetUsbStringDescriptor(winUsbDev.usbDevDescriptor.iProduct));
hdf5device.getRecord(rec).writeAttribute("Serial number", winUsbDev.GetUsbStringDescriptor(winUsbDev.usbDevDescriptor.iSerialNumber));
hdf5device.getRecord(rec).writeAttribute("Number of channels", NumberOfChannels);
hdf5device.getRecord(rec).writeAttribute("Samples / second", SamplesPerSecond);
hdf5device.getRecord(rec).writeAttribute("Resolution [Bit]", ResolutionBits);
hdf5device.getRecord(rec).writeAttribute("+Vref [mV]", (InputDifferantialVoltagePositive).ToString("R"));
hdf5device.getRecord(rec).writeAttribute("-Vref [mV]", (InputDifferantialVoltageNegative).ToString("R"));
}
// Write data + time to file
counter = 0;
if (hdf5device != null) rec = hdf5device.addRecord("EMG + timing", NumberOfChannels + 1, SamplesPerSecond, HDF5group.DataType.FLOAT, HDF5group.CompressionType.GZIP, 9);
if (memStream != null)
{
memStream.Position = 0;
while (memStream.Read(readBuffer, 0, DATALENGTH) == DATALENGTH)
{
fWriteBuffer = new float[9];
fWriteBuffer[0] = counter / (float)SamplesPerSecond;
for (UInt32 i = SampleLength, j = 1; i < DATALENGTH; i += SampleLength, j++)
{
data = readBuffer[i] << 24 | readBuffer[i + 1] << 16 | readBuffer[i + 2] << 8;
data /= 256;
// Analog inputs are full differential
if (data > 0)
fWriteBuffer[j] = (data * (InputDifferantialVoltagePositive - InputDifferantialVoltageNegative))
/ (float)Math.Pow(2, ResolutionBits-1);
else if (data < 0)
fWriteBuffer[j] = (data * (InputDifferantialVoltagePositive - InputDifferantialVoltageNegative))
/ (float)Math.Pow(2, ResolutionBits-1);
else
fWriteBuffer[j] = 0;
switch (j)
{
case 0: fWriteBuffer[j] /= CH1_GAIN_VALUE; break;
case 1: fWriteBuffer[j] /= CH2_GAIN_VALUE; break;
case 2: fWriteBuffer[j] /= CH3_GAIN_VALUE; break;
case 3: fWriteBuffer[j] /= CH4_GAIN_VALUE; break;
case 4: fWriteBuffer[j] /= CH5_GAIN_VALUE; break;
case 5: fWriteBuffer[j] /= CH6_GAIN_VALUE; break;
case 6: fWriteBuffer[j] /= CH7_GAIN_VALUE; break;
case 7: fWriteBuffer[j] /= CH8_GAIN_VALUE; break;
default: break;
}
}
if (hdf5device != null) hdf5device.getRecord(rec).writeData<float>(fWriteBuffer);
counter++;
}
}
// Write attributes
if (hdf5device != null)
{
hdf5device.getRecord(rec).writeAttribute("Manufacturer", winUsbDev.GetUsbStringDescriptor(winUsbDev.usbDevDescriptor.iManufacturer));
hdf5device.getRecord(rec).writeAttribute("Device name", winUsbDev.GetUsbStringDescriptor(winUsbDev.usbDevDescriptor.iProduct));
hdf5device.getRecord(rec).writeAttribute("Serial number", winUsbDev.GetUsbStringDescriptor(winUsbDev.usbDevDescriptor.iSerialNumber));
hdf5device.getRecord(rec).writeAttribute("Number of channels", NumberOfChannels);
hdf5device.getRecord(rec).writeAttribute("Samples / second", SamplesPerSecond);
hdf5device.getRecord(rec).writeAttribute("Resolution [Bit]", ResolutionBits);
hdf5device.getRecord(rec).writeAttribute("+Vref [mV]", (InputDifferantialVoltagePositive).ToString("R"));
hdf5device.getRecord(rec).writeAttribute("-Vref [mV]", (InputDifferantialVoltageNegative).ToString("R"));
}
// Write sample counter to extra hdf5 record
counter = 0;
if (hdf5device != null) rec = hdf5device.addRecord("Sample counter", 1, SamplesPerSecond, HDF5group.DataType.UINT64, HDF5group.CompressionType.GZIP, 9);
if (memStream != null)
{
memStream.Position = 0;
while (memStream.Read(readBuffer, 0, DATALENGTH) == DATALENGTH)
{
counterBuffer[0] = (UInt64)(readBuffer[1] << 8 | readBuffer[2]);
for (UInt32 i=0; i<(UInt32)(counter/(256*256)); i++) // overflows
counterBuffer[0] += (256*256);
if (hdf5device != null) hdf5device.getRecord(rec).writeData<UInt64>(counterBuffer);
counter++;
}
}
}
*/
/// <summary>
/// Reads data from the ADS1298 device.
/// </summary>
internal void ReadData()
{
const UInt32 maxBufferSize = 62208; // Optimal buffer value
UInt32 bufferSize;
UInt32 bytesRead = 0;
Byte[] readBuffer;
Byte[] writeBuffer = new Byte[USB_PACKET_SIZE];
Boolean success = false, sendSuccess = true;
// Select a optimal buffer size (not extending the consts above)
WinUsbDevice myWinUsb = new WinUsbDevice();
bufferSize = (UInt32)((HR ? DR_VALUE_HR : DR_VALUE_LP) * DATALENGTH * (UInt32)(myWinUsb.pipeTimeout * 0.75) / 1000);
bufferSize = bufferSize > maxBufferSize ? maxBufferSize : bufferSize;
readBuffer = new Byte[bufferSize];
memStream = new MemoryStream();
try
{
winUsbDev.FlushPipe(PIPE_DATA_IN);
// Send start-command to ADS device.
writeBuffer[0] = CMD_START;
success = winUsbDev.SendBulkData(PIPE_COMMAND_OUT, ref writeBuffer, (UInt32)writeBuffer.Length); // Send start-command to ADS device.
if (success)
{
do
{
// Read some data.
winUsbDev.ReadBulkData(PIPE_DATA_IN, bufferSize, ref readBuffer, ref bytesRead, ref success);
memStream.Write(readBuffer, 0, (Int32)bytesRead);
sendSuccess &= success;
}
while (processingData && bytesRead != 0);
}
if (sendSuccess)
{
writeBuffer[0] = CMD_STOP;
success = winUsbDev.SendBulkData(PIPE_COMMAND_OUT, ref writeBuffer, (UInt32)writeBuffer.Length); // Send stop-command to ADS device.
}
}
catch (ThreadAbortException)
{
throw;
}
finally
{
writeBuffer[0] = CMD_STOP;
winUsbDev.SendBulkData(PIPE_COMMAND_OUT, ref writeBuffer, (UInt32)writeBuffer.Length); // Send stop-command to ADS device.
winUsbDev.ReadBulkData(PIPE_DATA_IN, bufferSize, ref readBuffer, ref bytesRead, ref success); // Read the samples after we stopped the reading process.
}
}
