static public StreamSample[] ReadVoltageStream()
{
StreamSample[] samples = new StreamSample[12];
lock (UsbLockObj)
{
if (Msp430 != null)
{
// Request stream of 48 bytes (12 samples)
if (USBSendData(new byte[] { 0x04, 0x00 }))
{
byte[] wordBuf;
if (USBRecvData(out wordBuf))
{
for (int i = 0; i < wordBuf.Length; i += 4)
{
StreamSample sample = new StreamSample();
sample.SequenceId = wordBuf[i + 0];
if ((wordBuf[i + 1] & 0x80) > 0)
{
// Sign extend
wordBuf[i + 0] = 0xff;
}
else
{
wordBuf[i + 0] = 0;
}
Int32 data = (wordBuf[i + 0] << 24) + (wordBuf[i + 1] << 16) + (wordBuf[i + 2] << 8) + wordBuf[i + 3];
sample.Value = data;
samples[i >> 2] = sample;
}
return(samples);
}
}
}
}
IsConnected = false;
return(null);
}
/// <summary>
/// This thread is spun up when logging is turned on. If there's a problem during logging
/// of any kind (file access, bad communication with hardware, etc) then this thread will exit.
/// </summary>
private void LoggingThreadBinary()
{
float dt;
int sample = 0;
byte LastSequence = 0;
bool firstRead = true;
Debug.WriteLine("Binary logging thread started");
FileStream fs = null;
BinaryWriter sw = null;
try
{
dt = (float)(1.0 / GetSampleRate());
fs = new FileStream(LogFile, FileMode.Create, FileAccess.Write);
sw = new BinaryWriter(fs);
// Barker
sw.Write(0xCAFE8224);
sw.Write(GetSampleRate());
while (LoggingEnabled)
{
StreamSample[] buffer = new StreamSample[0];
try
{
while ((Hardware.GetFifoDepth() < 12) && (LoggingEnabled))
{
Thread.Sleep(5);
}
if (LoggingEnabled)
{
buffer = Hardware.ReadVoltageStream();
}
}
catch
{
break;
}
// Sync the sequence ID on the first read
if (firstRead)
{
firstRead = false;
LastSequence = (byte)(buffer[0].SequenceId - (byte)1);
}
// If nothing read, then bail
if (buffer.Length == 0)
{
break;
}
// If we're missing a block of data, write null samples to indicate such.
while ((byte)(LastSequence + 1) != buffer[0].SequenceId)
{
//sw.Write(sample++ * dt);
sw.Write(float.NaN);
++LastSequence;
}
for (int i = 0; i < buffer.Length; i++)
{
bool ovf = false;
//sw.WriteLine("-,{0:0.000},{1:N6}", sample++ * dt, ConvertCountsToVoltage(buffer[i].Value, ref ovf));
//sw.Write(sample++ * dt);
sw.Write((float)ConvertCountsToVoltage(buffer[i].Value, ref ovf));
LastSequence = buffer[i].SequenceId;
}
}
}
catch (Exception ex)
{
MessageBox.Show("Binary logging has stopped: " + ex.Message);
}
if (sw != null)
{
sw.Flush();
sw.Close();
}
if (fs != null)
{
fs.Close();
}
LoggingEnabled = false;
Debug.WriteLine("Binary logging thread exited. {0} samples written.", sample);
LoggingDone();
}
private void LoggingThreadText()
{
float dt;
int sample = 0;
byte LastSequence = 0;
bool firstRead = true;
Debug.WriteLine("Text logging thread started");
StreamWriter sw = null;
try
{
dt = (float)(1.0 / GetSampleRate());
sw = new StreamWriter(LogFile);
// Barker
sw.WriteLine("Logging file Created on " + DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToShortTimeString());
sw.WriteLine("Sample Rate {0} sps", GetSampleRate());
sw.WriteLine("Sample Time (seconds), Value");
while (LoggingEnabled)
{
StreamSample[] buffer = new StreamSample[0];
try
{
while ((Hardware.GetFifoDepth() < 12) && (LoggingEnabled))
{
Thread.Sleep(5);
}
if (LoggingEnabled)
{
buffer = Hardware.ReadVoltageStream();
}
}
catch
{
break;
}
// Sync the sequence ID on the first read
if (firstRead)
{
firstRead = false;
LastSequence = (byte)(buffer[0].SequenceId - (byte)1);
}
// If nothing read, then bail
if (buffer.Length == 0)
{
break;
}
// If we're missing a block of data, write null samples to indicate such.
while ((byte)(LastSequence + 1) != buffer[0].SequenceId)
{
//sw.Write(sample++ * dt);
sw.WriteLine("{0}, {1}", sample++ *dt, "MISSED DATA");
++LastSequence;
}
for (int i = 0; i < buffer.Length; i++)
{
bool ovf = false;
sw.WriteLine("{0:0.000},{1:N6}", sample++ *dt, ConvertCountsToVoltage(buffer[i].Value, ref ovf));
LastSequence = buffer[i].SequenceId;
}
}
}
catch (Exception ex)
{
MessageBox.Show("Text logging has stopped: " + ex.Message);
}
if (sw != null)
{
sw.Flush();
sw.Close();
}
LoggingEnabled = false;
Debug.WriteLine("Text logging thread exited. {0} samples written.", sample);
LoggingDone();
}
