private void ReadFast(SampleValue[] samples)
{
byte[] readBuffer = new byte[3]; /* Buffer to hold read data*/
byte[] writeBuffer = new byte[3] {
0x00, 0x00, 0x00
};
Func <byte[], int> convertToIntFunc = null;
/* Setup the appropriate ADC configuration byte */
switch (ADC_DEVICE)
{
case AdcDevice.MCP3002:
writeBuffer[0] = MCP3002_CONFIG;
convertToIntFunc = convertToIntMCP3002;
break;
case AdcDevice.MCP3208:
writeBuffer[0] = MCP3208_CONFIG;
convertToIntFunc = convertToIntMCP3208;
break;
}
Stopwatch.StartNew();
int sampleSize = samples.Length;
for (int sampleIndex = 0; sampleIndex < sampleSize; sampleIndex++)
{
SpiADC.TransferFullDuplex(writeBuffer, readBuffer); /* Read data from the ADC */
adcValue = convertToIntFunc(readBuffer); /* Convert the returned bytes into an integer value */
samples[sampleIndex] = new SampleValue()
{
Tick = Stopwatch.GetTimestamp(), Value = adcValue
};
}
}
private void TakeReadings()
{
SampleValue[] samples = new SampleValue[sampleSize];
ReadFast(samples);
int average = 0;
int min = int.MaxValue;
int max = int.MinValue;
OscopeHelper.ProcessStats(samples, ref average, ref min, ref max);
if (normalized)
{
OscopeHelper.NormalizeToAverage(samples, (min + max) / 2);
}
var crossings = OscopeHelper.ProcessZeroCrossings(samples, positiveTrigger, normalized ? 0 : 512, 2, 1);
double cross = crossings.Any() ? crossings.First().Value : 0;
double oneCycle = crossings.Count > 1 ? (crossings.ElementAt(1).Value - crossings.ElementAt(0).Value) : 0;
var task2 = this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
var freq = 1000.0 / Stopwatch.Frequency;
viewModel.Points = samples.Select(s => new ScatterDataPoint
{
XValue = (s.Tick - cross) * freq,
YValue = s.Value,
});
viewModel.Average = average;
viewModel.Min = min;
viewModel.Max = max;
viewModel.OneCycleMS = oneCycle * freq;
var now = DateTime.Now;
viewModel.RunMS = (now - lastRun).TotalMilliseconds;
lastRun = now;
});
}
private void ReadFast(SampleValue[] samples)
{
byte[] readBuffer = new byte[3]; /* Buffer to hold read data*/
byte[] writeBuffer = new byte[3] { 0x00, 0x00, 0x00 };
Func<byte[], int> convertToIntFunc = null;
/* Setup the appropriate ADC configuration byte */
switch (ADC_DEVICE)
{
case AdcDevice.MCP3002:
writeBuffer[0] = MCP3002_CONFIG;
convertToIntFunc = convertToIntMCP3002;
break;
case AdcDevice.MCP3208:
writeBuffer[0] = MCP3208_CONFIG;
convertToIntFunc = convertToIntMCP3208;
break;
}
Stopwatch.StartNew();
int sampleSize = samples.Length;
for (int sampleIndex = 0; sampleIndex < sampleSize; sampleIndex++)
{
SpiADC.TransferFullDuplex(writeBuffer, readBuffer); /* Read data from the ADC */
adcValue = convertToIntFunc(readBuffer); /* Convert the returned bytes into an integer value */
samples[sampleIndex] = new SampleValue() { Tick = Stopwatch.GetTimestamp(), Value = adcValue };
}
}
private void TakeReadings()
{
SampleValue[] samples = new SampleValue[sampleSize];
ReadFast(samples);
int average = 0;
int min = int.MaxValue;
int max = int.MinValue;
OscopeHelper.ProcessStats(samples, ref average, ref min, ref max);
if (normalized)
{
OscopeHelper.NormalizeToAverage(samples, (min + max) / 2);
}
var crossings = OscopeHelper.ProcessZeroCrossings(samples, positiveTrigger, normalized ? 0 : 512, 2, 1);
double cross = crossings.Any() ? crossings.First().Value : 0;
double oneCycle = crossings.Count > 1 ? (crossings.ElementAt(1).Value - crossings.ElementAt(0).Value) : 0;
var task2 = this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
var freq = 1000.0 / Stopwatch.Frequency;
viewModel.Points = samples.Select(s => new ScatterDataPoint
{
XValue = (s.Tick - cross) * freq,
YValue = s.Value,
});
viewModel.Average = average;
viewModel.Min = min;
viewModel.Max = max;
viewModel.OneCycleMS = oneCycle * freq;
var now = DateTime.Now;
viewModel.RunMS = (now - lastRun).TotalMilliseconds;
lastRun = now;
});
}
