public void BitBangSpiFreqTest()
{
Console.WriteLine("Testing bit bang SPI SCLK freq...");
byte[] MOSI = new byte[1024];
double expectedTime;
Stopwatch timer = new Stopwatch();
double baseTime = 0;
int numReads = 8;
/* 1MHz SCLK */
FX3.SetBitBangSpiFreq(1000000);
/* Get base time (max SCLK with 0.5 microsecond stall) */
FX3.SetBitBangStallTime(0.5);
for (int i = 0; i < 4; i++)
{
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.BitBangSpi(4000, 1, MOSI, 2000);
}
timer.Stop();
baseTime += timer.ElapsedMilliseconds;
}
/* Average base time */
baseTime /= 4.0;
/* Subtract time for clocks in basetime */
baseTime -= (4000000.0 / 1000000) * numReads;
Console.WriteLine("Base bitbang SPI time: " + baseTime.ToString() + "ms");
for (uint freq = 75000; freq <= 900000; freq += 25000)
{
Console.WriteLine("Testing freq of " + freq.ToString() + "Hz");
FX3.SetBitBangSpiFreq(freq);
/* Perform sets of 1 4000-bit transfer. Expected time is in ms */
expectedTime = (4000000.0 / freq) * numReads;
/* Add base time overhead */
expectedTime += baseTime;
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.BitBangSpi(4000, 1, MOSI, 2000);
}
timer.Stop();
Console.WriteLine("Expected time: " + expectedTime.ToString() + "ms, real time: " + timer.ElapsedMilliseconds.ToString() + "ms");
Assert.AreEqual(expectedTime, timer.ElapsedMilliseconds, Math.Max(25, 0.1 * expectedTime), "ERROR: Invalid transfer time");
}
}
public void BitBangSpiStallTimeTest()
{
Console.WriteLine("Testing bit bang SPI stall time...");
byte[] MOSI = new byte[1024];
double expectedTime;
Stopwatch timer = new Stopwatch();
double baseTime = 0;
int numReads = 5;
FX3.SetBitBangSpiFreq(500000);
/* Get base time (with half microsecond stall) */
FX3.SetBitBangStallTime(0.5);
for (int i = 0; i < 4; i++)
{
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.BitBangSpi(4, 1001, MOSI, 2000);
}
timer.Stop();
baseTime += timer.ElapsedMilliseconds;
}
/* Average base time */
baseTime /= 4.0;
Console.WriteLine("Base bitbang SPI time: " + baseTime.ToString() + "ms");
for (double stallTime = 50; stallTime >= 5; stallTime--)
{
Console.WriteLine("Testing stall time of " + stallTime.ToString() + "us");
FX3.SetBitBangStallTime(stallTime);
/* Perform sets of 1001 4-bit transfers (1000 stalls). Expected time is in ms */
expectedTime = stallTime * numReads;
/* Add base time overhead */
expectedTime += baseTime;
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.BitBangSpi(4, 1001, MOSI, 2000);
}
timer.Stop();
Console.WriteLine("Expected time: " + expectedTime.ToString() + "ms, real time: " + timer.ElapsedMilliseconds.ToString() + "ms");
Assert.AreEqual(expectedTime, timer.ElapsedMilliseconds, 0.5 * baseTime, "ERROR: Invalid transfer time");
}
}
