public void SpiStallTimeTest()
{
Console.WriteLine("Starting SPI stall time test...");
double expectedTime;
Stopwatch timer = new Stopwatch();
double baseTime = 0;
int numReads = 5;
uint[] MOSI = new uint[200];
/* Stall time for transfer reads (32 bits) */
Console.WriteLine("Testing stall time for 32-bit reads (transfer stream)...");
FX3.WordLength = 32;
FX3.SclkFrequency = 15000000;
FX3.ChipSelectLeadTime = SpiLagLeadTime.SPI_SSN_LAG_LEAD_ONE_HALF_CLK;
FX3.ChipSelectLagTime = SpiLagLeadTime.SPI_SSN_LAG_LEAD_ONE_HALF_CLK;
/* Get base stall time (5us stall) */
for (int i = 0; i < 8; i++)
{
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.TransferArray(MOSI, 5);
}
timer.Stop();
baseTime += timer.ElapsedMilliseconds;
}
/* Average base time */
baseTime /= 8.0;
Console.WriteLine("Base SPI transfer time with 5us stall: " + baseTime.ToString() + "ms");
for (ushort stallTime = 50; stallTime >= 7; stallTime--)
{
Console.WriteLine("Testing stall time of " + stallTime.ToString() + "us");
FX3.StallTime = stallTime;
/* Perform sets of 5 sets of 200 32-bit transfers (999 stalls). Expected time is in ms */
expectedTime = (stallTime - 5) * numReads;
/* Add base time overhead */
expectedTime += baseTime;
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.TransferArray(MOSI, 5);
}
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");
System.Threading.Thread.Sleep(100);
}
/* Stall time for generic reads */
Console.WriteLine("Testing stall time for 16-bit reads (generic stream)...");
FX3.WordLength = 16;
/* Get base stall time (5us stall) */
baseTime = 0;
for (int i = 0; i < 8; i++)
{
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.ReadRegArray(MOSI, 5);
}
timer.Stop();
baseTime += timer.ElapsedMilliseconds;
}
/* Average base time */
baseTime /= 8.0;
Console.WriteLine("Base SPI transfer time with 5us stall: " + baseTime.ToString() + "ms");
for (ushort stallTime = 50; stallTime >= 7; stallTime--)
{
Console.WriteLine("Testing stall time of " + stallTime.ToString() + "us");
FX3.StallTime = stallTime;
/* Perform sets of 5 sets of 200 16-bit transfers (999 stalls). Expected time is in ms */
expectedTime = (stallTime - 5) * numReads;
/* Add base time overhead */
expectedTime += baseTime;
timer.Restart();
for (int trial = 0; trial < numReads; trial++)
{
FX3.ReadRegArray(MOSI, 5);
}
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");
System.Threading.Thread.Sleep(100);
}
FX3.StallTime = 5;
}