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"); } }