public SpiStream(PigpiodIf pigpiodIf, UInt32 channel, UInt32 speed, UInt32 flags)
{
this.pigpiodIf = pigpiodIf;
for (int i = 0; i < 3; i++)
{
handle = pigpiodIf.spi_open(channel, speed, flags);
//Console.WriteLine("spi_open: {0}", handle);
if (handle >= 0)
{
break;
}
System.Threading.Thread.Sleep(100);
}
if (handle < 0)
{
throw new PigpiodIfException(handle, "PigpiodIf: " + pigpiodIf.pigpio_error(handle));
}
}
private async void buttonRollStart_Click(object sender, EventArgs e)
{
buttonRollStart.Enabled = false;
buttonFastStart.Enabled = false;
buttonRollStop.Enabled = true;
int h = -1;
try
{
rollCts = new CancellationTokenSource();
var ct = rollCts.Token;
await Task.Run(() =>
{
h = pigpiodIf.spi_open(2, 1000000, 256 + 0);
if (h < 0)
{
throw new PigpiodIfException(h, "PigpiodIf: " + pigpiodIf.pigpio_error(h));
}
for (int ch = 0; ch < NUM_ROLL_CHANNELS; ch++)
{
rollSeries[ch].Points.Clear();
}
DateTime start = DateTime.Now;
while (!ct.IsCancellationRequested)
{
double[] volts = new double[NUM_ROLL_CHANNELS];
DataPoint[] dataPoints = new DataPoint[NUM_ROLL_CHANNELS];
for (int ch = 0; ch < NUM_ROLL_CHANNELS; ch++)
{
byte[] buf = new byte[] { (byte)(0x06 + (ch >> 2)), (byte)(ch << 6), 0x00 };
int b = pigpiodIf.spi_xfer((UInt32)h, buf, buf);
if (b == 3)
{
TimeSpan ts = DateTime.Now - start;
double volt = 3.3 * (((buf[1] & 0x0f) * 256) + buf[2]) / 4096.0;
volts[ch] = volt;
dataPoints[ch] = new DataPoint(ts.TotalSeconds, volt);
}
}
string s = volts[0].ToString("0.0");
for (int ch = 1; ch < NUM_ROLL_CHANNELS; ch++)
{
s += string.Format(", {0:0.0}", volts[ch]);
}
Console.WriteLine("{0}", s);
Invoke(new Action(() =>
{
for (int ch = 0; ch < NUM_ROLL_CHANNELS; ch++)
{
if (rollSeries[ch].Points.Count >= NUM_ROLL_SAMPLES)
{
rollSeries[ch].Points.RemoveAt(0);
}
rollSeries[ch].Points.Add(dataPoints[ch]);
}
rollPlotModel.InvalidatePlot(true);
if (plotView1.Model != rollPlotModel)
{
plotView1.Model = rollPlotModel;
}
else
{
plotView1.Invalidate();
}
}));
}
}, ct);
}
catch (OperationCanceledException)
{
// nothing to do
}
catch (PigpiodIfException ex)
{
Console.WriteLine(ex.Message);
}
finally
{
if (h >= 0)
{
pigpiodIf.spi_close((UInt32)h);
}
rollCts = null;
buttonRollStart.Enabled = true;
buttonFastStart.Enabled = true;
buttonRollStop.Enabled = false;
}
}