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 BitBangSpiModeTest()
{
Console.WriteLine("Starting bit bang SPI mode test...");
byte[] MISO;
uint mode;
List <byte> MOSI = new List <byte>();
for (int i = 0; i < 1024; i++)
{
MOSI.Add((byte)(i & 0x7F));
}
FX3.BitBangSpiConfig = new BitBangSpiConfig(true);
FX3.BitBangSpiConfig.SCLK = (FX3PinObject)FX3.DIO3;
FX3.ReadPin(FX3.DIO3);
FX3.ReadPin(FX3.DIO3);
Random rnd = new Random();
for (int trial = 0; trial < 64; trial++)
{
mode = (uint)(rnd.NextDouble() * 4);
Console.WriteLine("Testing bit-bang SPI mode " + mode.ToString());
FX3.BitBangSpiConfig.CPHA = ((mode & 0x1) != 0);
FX3.BitBangSpiConfig.CPOL = ((mode & 0x2) != 0);
for (uint len = 8; len < 64; len += 8)
{
MISO = FX3.BitBangSpi(len, 1, MOSI.ToArray(), 1000);
Assert.AreEqual(len >> 3, MISO.Count(), "ERROR: Invalid data count");
for (int i = 0; i < MISO.Count(); i++)
{
Assert.AreEqual(MOSI[i], MISO[i], "ERROR: Invalid echo data");
}
}
/* Check SCLK pin level after transfer */
if (FX3.BitBangSpiConfig.CPOL)
{
Assert.AreEqual(1, FX3.ReadPin(FX3.DIO4), "ERROR: Expected SCLK to be idle high");
}
else
{
Assert.AreEqual(0, FX3.ReadPin(FX3.DIO4), "ERROR: Expected SCLK to be idle low");
}
}
}
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");
}
}
public void BitBangSpiTest()
{
Console.WriteLine("Starting bit bang SPI functionality test...");
byte[] MISO;
List <byte> MOSI = new List <byte>();
for (int i = 0; i < 1024; i++)
{
MOSI.Add((byte)(i & 0x7F));
}
Console.WriteLine("Testing bit bang SPI word length...");
for (uint wordLen = 8; wordLen <= 512; wordLen += 8)
{
Console.WriteLine("Testing bit length of " + wordLen.ToString());
/* Override SPI pins */
FX3.BitBangSpiConfig = new BitBangSpiConfig(true);
MISO = FX3.BitBangSpi(wordLen, 1, MOSI.ToArray(), 1000);
Assert.AreEqual(Math.Ceiling(wordLen / 8.0), MISO.Count(), "ERROR: Invalid data count");
for (int i = 0; i < MISO.Count(); i++)
{
Assert.AreEqual(MOSI[i], MISO[i], "ERROR: Invalid echo data");
}
/* Override DIO3/4 pins */
FX3.BitBangSpiConfig.MOSI = (FX3PinObject)FX3.DIO3;
FX3.BitBangSpiConfig.MISO = (FX3PinObject)FX3.DIO4;
MISO = FX3.BitBangSpi(wordLen, 1, MOSI.ToArray(), 1000);
Assert.AreEqual(Math.Ceiling(wordLen / 8.0), MISO.Count(), "ERROR: Invalid data count");
for (int i = 0; i < MISO.Count(); i++)
{
Assert.AreEqual(MOSI[i], MISO[i], "ERROR: Invalid echo data");
}
}
Console.WriteLine("Testing restore hardware SPI functionality...");
FX3.RestoreHardwareSpi();
TestSpiFunctionality();
}