void ScanConnectedAmplifiers()
{
// Set sampling rate to highest value for maximum temporal resolution.
ChangeSampleRate(AmplifierSampleRate.SampleRate30000Hz);
// Enable all data streams, and set sources to cover one or two chips
// on Ports A-D.
evalBoard.SetDataSource(0, BoardDataSource.PortA1);
evalBoard.SetDataSource(1, BoardDataSource.PortA2);
evalBoard.SetDataSource(2, BoardDataSource.PortB1);
evalBoard.SetDataSource(3, BoardDataSource.PortB2);
evalBoard.SetDataSource(4, BoardDataSource.PortC1);
evalBoard.SetDataSource(5, BoardDataSource.PortC2);
evalBoard.SetDataSource(6, BoardDataSource.PortD1);
evalBoard.SetDataSource(7, BoardDataSource.PortD2);
var maxNumDataStreams = Rhythm.Net.Rhd2000EvalBoard.MaxNumDataStreams(evalBoard.IsUsb3());
for (int i = 0; i < maxNumDataStreams; i++)
{
evalBoard.EnableDataStream(i, true);
}
// Select RAM Bank 0 for AuxCmd3
evalBoard.SelectAuxCommandBank(BoardPort.PortA, AuxCmdSlot.AuxCmd3, 0);
evalBoard.SelectAuxCommandBank(BoardPort.PortB, AuxCmdSlot.AuxCmd3, 0);
evalBoard.SelectAuxCommandBank(BoardPort.PortC, AuxCmdSlot.AuxCmd3, 0);
evalBoard.SelectAuxCommandBank(BoardPort.PortD, AuxCmdSlot.AuxCmd3, 0);
// Since our longest command sequence is 60 commands, we run the SPI
// interface for 60 samples (256 for usb3 power-of two needs).
evalBoard.SetMaxTimeStep((uint)samplesPerBlock);
evalBoard.SetContinuousRunMode(false);
// Run SPI command sequence at all 16 possible FPGA MISO delay settings
// to find optimum delay for each SPI interface cable.
var maxNumChips = 8;
var chipId = new int[maxNumChips];
var optimumDelays = new int[maxNumChips];
var secondDelays = new int[maxNumChips];
var goodDelayCounts = new int[maxNumChips];
for (int i = 0; i < optimumDelays.Length; i++)
{
optimumDelays[i] = -1;
secondDelays[i] = -1;
goodDelayCounts[i] = 0;
}
for (int delay = 0; delay < 16; delay++)
{
evalBoard.SetCableDelay(BoardPort.PortA, delay);
evalBoard.SetCableDelay(BoardPort.PortB, delay);
evalBoard.SetCableDelay(BoardPort.PortC, delay);
evalBoard.SetCableDelay(BoardPort.PortD, delay);
// Run SPI command sequence
var dataBlock = RunSingleCommandSequence();
// Read the Intan chip ID number from each RHD2000 chip found.
// Record delay settings that yield good communication with the chip.
for (int chipIdx = 0; chipIdx < chipId.Length; chipIdx++)
{
int register59Value;
var id = ReadDeviceId(dataBlock, chipIdx, out register59Value);
if (id > 0)
{
chipId[chipIdx] = id;
goodDelayCounts[chipIdx]++;
switch (goodDelayCounts[chipIdx])
{
case 1: optimumDelays[chipIdx] = delay; break;
case 2: secondDelays[chipIdx] = delay; break;
case 3: optimumDelays[chipIdx] = secondDelays[chipIdx]; break;
}
}
}
}
// Now that we know which RHD2000 amplifier chips are plugged into each SPI port,
// add up the total number of amplifier channels on each port and calculate the number
// of data streams necessary to convey this data over the USB interface.
var numStreamsRequired = 0;
var rhd2216ChipPresent = false;
for (int chipIdx = 0; chipIdx < chipId.Length; ++chipIdx)
{
switch (chipId[chipIdx])
{
case ChipIdRhd2216:
numStreamsRequired++;
rhd2216ChipPresent = true;
break;
case ChipIdRhd2132:
numStreamsRequired++;
break;
case ChipIdRhd2164:
numStreamsRequired += 2;
break;
default:
break;
}
}
// If the user plugs in more chips than the USB interface can support, throw an exception
if (numStreamsRequired > maxNumDataStreams)
{
var capacityExceededMessage = "Capacity of USB Interface Exceeded. This RHD2000 USB interface board can only support {0} amplifier channels.";
if (rhd2216ChipPresent)
{
capacityExceededMessage += " (Each RHD2216 chip counts as 32 channels for USB interface purposes.)";
}
capacityExceededMessage = string.Format(capacityExceededMessage, maxNumDataStreams * 32);
throw new InvalidOperationException(capacityExceededMessage);
}
// Reconfigure USB data streams in consecutive order to accommodate all connected chips.
int activeStream = 0;
for (int chipIdx = 0; chipIdx < chipId.Length; ++chipIdx)
{
if (chipId[chipIdx] > 0)
{
evalBoard.EnableDataStream(activeStream, true);
evalBoard.SetDataSource(activeStream, (BoardDataSource)chipIdx);
if (chipId[chipIdx] == ChipIdRhd2164)
{
evalBoard.EnableDataStream(activeStream + 1, true);
evalBoard.SetDataSource(activeStream + 1, (BoardDataSource)(chipIdx + BoardDataSource.PortA1Ddr));
activeStream += 2;
}
else
{
activeStream++;
}
}
else
{
optimumDelays[chipIdx] = 0;
}
}
// Now, disable data streams where we did not find chips present.
for (; activeStream < maxNumDataStreams; activeStream++)
{
evalBoard.EnableDataStream(activeStream, false);
}
// Set cable delay settings that yield good communication with each
// RHD2000 chip.
var optimumDelayA = CableDelayA.GetValueOrDefault(Math.Max(optimumDelays[0], optimumDelays[1]));
var optimumDelayB = CableDelayB.GetValueOrDefault(Math.Max(optimumDelays[2], optimumDelays[3]));
var optimumDelayC = CableDelayC.GetValueOrDefault(Math.Max(optimumDelays[4], optimumDelays[5]));
var optimumDelayD = CableDelayD.GetValueOrDefault(Math.Max(optimumDelays[6], optimumDelays[7]));
evalBoard.SetCableDelay(BoardPort.PortA, optimumDelayA);
evalBoard.SetCableDelay(BoardPort.PortB, optimumDelayB);
evalBoard.SetCableDelay(BoardPort.PortC, optimumDelayC);
evalBoard.SetCableDelay(BoardPort.PortD, optimumDelayD);
cableLengthPortA = evalBoard.EstimateCableLengthMeters(optimumDelayA);
cableLengthPortB = evalBoard.EstimateCableLengthMeters(optimumDelayB);
cableLengthPortC = evalBoard.EstimateCableLengthMeters(optimumDelayC);
cableLengthPortD = evalBoard.EstimateCableLengthMeters(optimumDelayD);
// Return sample rate to original user-selected value.
ChangeSampleRate(SampleRate);
}