changeset 189:7144c5594d16

Added loopback digital/analog test. This (randomly) fails for the first loopback sample received when -p2. Maybe some stale memory somewhere?

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/projects/gpioAnalogLoopbackTest/render.cpp	Tue Jan 26 00:02:15 2016 +0000
@@ -0,0 +1,210 @@
+#include <BeagleRT.h>
+#include <Utilities.h>
+#include <cmath>
+#include <rtdk.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stats.hpp>
+// setup() is called once before the audio rendering starts.
+// Use it to perform any initialisation and allocation which is dependent
+// on the period size or sample rate.
+//
+// userData holds an opaque pointer to a data structure that was passed
+// in from the call to initAudio().
+//
+// Return true on success; returning false halts the program.
+
+
+// digital inputs can be changed at will (as they are all being processed at the same time)
+// analog channels must be as per below
+int gAnalogOutCh = 1;
+int gDigitalOutCh = 2;
+int gDigitalInACh = 0;
+int gDigitalInDCh = 3;
+int gAnalogOutLoopDelay;
+int gDigitalOutLoopDelay;
+bool setup(BeagleRTContext *context, void *userData)
+{
+	rt_printf("For this test you need the following connections:\n"
+			"analog%d out->digital%d in, analog%d out->analog%d in, "
+			"digital%d out -> digital%d in, digital%d out-> analog%d in\n",
+			gAnalogOutCh, gDigitalInACh, gAnalogOutCh, 0, gDigitalOutCh, gDigitalInDCh, gDigitalOutCh, 0);
+	rt_printf("Running test with %d analog channels and a buffer size of %d\n",
+			context->analogChannels, context->audioFrames);
+
+	for(unsigned int n = 0; n < context->digitalFrames; n++){
+		pinModeFrame(context, n, gDigitalInACh, INPUT);
+		pinModeFrame(context, n, gDigitalInDCh, INPUT);
+		pinModeFrame(context, n, gDigitalOutCh, OUTPUT);
+	}
+	switch (context->analogChannels){
+		case 2:
+			gAnalogOutLoopDelay = context->audioFrames*2 + 3;
+			gDigitalOutLoopDelay = context->audioFrames*2 + 2;
+			break;
+		case 4:
+			gAnalogOutLoopDelay = context->audioFrames*2 + 3;
+			gDigitalOutLoopDelay = context->audioFrames*2 + 2;
+			break;
+		case 8:
+			gAnalogOutLoopDelay = context->audioFrames + 3;
+			gDigitalOutLoopDelay = context->audioFrames + 1;
+			break;
+		default:
+			exit(2);
+	}
+
+    return true;
+}
+
+// render() is called regularly at the highest priority by the audio engine.
+// Input and output are given from the audio hardware and the other
+// ADCs and DACs (if available). If only audio is available, numAnalogFrames
+// will be 0.
+
+const int patternLength = 31;
+static int anaErrorCount = 0;
+static int digErrorCount = 0;
+void render(BeagleRTContext *context, void *userData)
+{
+	static bool writePattern[patternLength] = {
+									0,1,0,1,0,0,1,1,
+									0,0,0,1,1,1,0,0,
+									1,1,1,1,0,0,0,0,
+									1,1,1,1,1,0,0};
+//	for(int n = 0; n < patternLength; n++){
+//		writePattern[n]=1;
+//	}
+	static int inPointer = 0;
+	static int outPointer = 0;
+	static int digitalOutPointer = 0;
+	static int digitalInPointer = 0;
+	static int analogOut = 1;
+	/** Checking offset between analog and digital
+	 * how it should be :
+	 * The PRU loop does the following (the loop runs at 88.2kHz):
+	 * - Read/write audio sample (once for the left channel, once for the right channel)
+	 * - Write DAC 0 or 0/2 or 0/2/4/6
+	 * - Read ADC 0 or 0/2 or 0/2/4/6, 2 samples (@176.4) older than NOW
+	 * - /During/ the line above, every two loops we also Read/Write GPIO,
+	 * therefore reading on ADC 0/2/4/6 a value that is being output from GPIO will lead to undefined results
+	 * - Write DAC 1 or 1/3 or 1/3/5/7
+	 * - Read ADC 1 or 1/3 or 1/3/5/7, 2 samples (@176.4) older than NOW
+	 */
+	if(1)
+	for(unsigned int n = 0; n < context->audioFrames; n++){
+		static bool analog0In = false;
+		static bool digitalAIn = false;
+		static int count = 0;
+		bool doReadWrite = context->analogChannels<=4 ? true : ((context->analogChannels == 8) && (n&1)==0);
+		if(doReadWrite){
+			digitalAIn = digitalReadFrame(context, n, gDigitalInACh);
+			switch(context->analogChannels){
+			case 8:
+				analog0In = analogReadFrame(context, n/2, 0) > 0.5;
+				analogWriteFrame(context, n/2, analogOut, writePattern[outPointer]);
+				break;
+			case 4:
+				analog0In = analogReadFrame(context, n, 0) > 0.5;
+				analogWriteFrame(context, n, analogOut, writePattern[outPointer]);
+				break;
+			case 2:
+				analog0In = analogReadFrame(context, n * 2 + 1, 0) > 0.5;
+				analogWriteFrame(context, 2 * n, analogOut, writePattern[outPointer]);
+				analogWriteFrame(context, 2 * n + 1, analogOut, writePattern[outPointer]);
+				break;
+			}
+			gAnalogOutLoopDelay--;
+			outPointer++;
+			if(gAnalogOutLoopDelay <= 0){
+				if(++inPointer == patternLength){
+					inPointer = 0;
+				}
+			}
+		}
+		bool expectedIn = writePattern[inPointer];
+		if(gAnalogOutLoopDelay <= 0 && doReadWrite == true){
+			if(analog0In != expectedIn || digitalAIn != expectedIn){
+				rt_printf("expected: %d, received: %d %d, pointer: %d, delay: %d, count: %d\n",
+					expectedIn, analog0In, digitalAIn, inPointer, gAnalogOutLoopDelay, count);
+				anaErrorCount++;
+			}
+		}
+		count++;
+		if(analog0In != digitalAIn){ // at any time the analog and digital in should be the same
+			rt_printf("ana %d_%d %d,\n", analog0In, digitalAIn, n);
+		}
+		if(outPointer == patternLength){
+			outPointer = 0;
+		}
+	}
+	if(1)
+	for(unsigned int n = 0; n < context->audioFrames; n++){
+		static int count = 0;
+		static bool analog1In = false;
+		static bool digitalDIn = false;
+/* we need to remember the pastAnalog1In because
+ *  reading GPIO takes place before writing to it, therefore
+ *  when reading a GPIOout, the GPIOin samples will always be one sample late
+ */
+		bool doReadWrite = false;
+		static bool pastAnalog1In = false;
+		digitalWriteFrameOnce(context, n, gDigitalOutCh,  writePattern[digitalOutPointer]);
+		if(context->analogChannels == 8){
+			if((n&1) == 0){ //do it every other sample
+				pastAnalog1In = analogReadFrame(context, n/2, 1) > 0.5;
+				digitalDIn = digitalReadFrame(context, n, gDigitalInDCh);
+				doReadWrite = true;
+			}
+		}
+		if(context->analogChannels == 4){
+			pastAnalog1In = analogReadFrame(context, n, 1) > 0.5;
+			digitalDIn = digitalReadFrame(context, n, gDigitalInDCh);
+			digitalWriteFrameOnce(context, n, gDigitalOutCh,  writePattern[digitalOutPointer]);
+			doReadWrite = true;
+		}
+		if(context->analogChannels == 2){
+			pastAnalog1In = analogReadFrame(context, n * 2, 1) > 0.5;
+			digitalDIn = digitalReadFrame(context, n, gDigitalInDCh);
+			digitalWriteFrameOnce(context, n, gDigitalOutCh,  writePattern[digitalOutPointer]);
+			doReadWrite = true;
+		}
+		bool expectedDigitalIn = writePattern[digitalInPointer];
+		if(doReadWrite == true){
+			gDigitalOutLoopDelay--;
+			if(gDigitalOutLoopDelay <= 0){
+				if(expectedDigitalIn != pastAnalog1In || expectedDigitalIn != digitalDIn){
+					rt_printf("D expected: %d, received: %d %d, pointer: %d, delay: %d, count: %d\n",
+						expectedDigitalIn, pastAnalog1In, digitalDIn, inPointer, gDigitalOutLoopDelay, count);
+					digErrorCount++;
+				}
+				if(++digitalInPointer == patternLength){
+					digitalInPointer = 0;
+				}
+			}
+			pastAnalog1In = analog1In;
+			if(++digitalOutPointer == patternLength){
+				digitalOutPointer = 0;
+			}
+		}
+		count++;
+	}
+	if(context->audioSampleCount > 30000){
+		gShouldStop = true;
+	}
+}
+
+
+void cleanup(BeagleRTContext *context, void *userData)
+{
+	if(anaErrorCount == 0 && digErrorCount == 0){
+		rt_printf("Test was succesful with %d analog channels and a buffer size of %d\n", context->analogChannels, context->audioFrames);
+	} else {
+		rt_printf("------------------------\n%danalog %ddigital errors over %dsamples while running test with ",
+				anaErrorCount, digErrorCount, context->audioSampleCount);
+		rt_printf("%d analog channels and a buffer size of %d \n\n\n",
+				context->analogChannels, context->audioFrames);
+		exit(1);
+	}
+}