comparison projects/cape_test/render.cpp @ 55:41d24dba6b74 newapi

Add cape test project and make rt_printf (rtdk.h) part of standard BeagleRT.h include

+/*
+ * render.cpp
+ *
+ *  Created on: Oct 24, 2014
+ *      Author: parallels
+ */
+
+
+#include "../../include/BeagleRT.h"
+#include <cmath>
+
+#define ANALOG_LOW	(2048.0 / 65536.0)
+#define ANALOG_HIGH (50000.0 / 65536.0)
+
+const int gDACPinOrder[] = {6, 4, 2, 0, 1, 3, 5, 7};
+
+uint64_t gLastErrorFrame = 0;
+uint32_t gEnvelopeSampleCount = 0;
+float gEnvelopeValue = 0.5;
+float gEnvelopeDecayRate = 0.9995;
+
+// initialise_render() 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.
+
+bool initialise_render(BeagleRTContext *context, void *userData)
+{
+	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, numMatrixFrames
+// will be 0.
+
+void render(BeagleRTContext *context, void *userData)
+{
+	static float phase = 0.0;
+	static int sampleCounter = 0;
+	static int invertChannel = 0;
+	float frequency = 0;
+
+	// Play a sine wave on the audio output
+	for(unsigned int n = 0; n < context->audioFrames; n++) {
+		context->audioOut[2*n] = context->audioOut[2*n + 1] = gEnvelopeValue * sinf(phase);
+
+		// If one second has gone by with no error, play one sound, else
+		// play another
+		if(context->audioSampleCount + n - gLastErrorFrame > 44100) {
+			gEnvelopeValue *= gEnvelopeDecayRate;
+			gEnvelopeSampleCount++;
+			if(gEnvelopeSampleCount > 22050) {
+				gEnvelopeValue = 0.5;
+				gEnvelopeSampleCount = 0;
+			}
+			frequency = 880.0;
+		}
+		else {
+			gEnvelopeValue = 0.5;
+			frequency = 220.0;
+		}
+
+		phase += 2.0 * M_PI * frequency / 44100.0;
+		if(phase >= 2.0 * M_PI)
+			phase -= 2.0 * M_PI;
+	}
+
+	for(unsigned int n = 0; n < context->analogFrames; n++) {
+		// Change outputs every 512 samples
+		if(sampleCounter < 512) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel)
+					context->analogOut[n*8 + gDACPinOrder[k]] = ANALOG_HIGH;
+				else
+					context->analogOut[n*8 + gDACPinOrder[k]] = 0;
+			}
+		}
+		else {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel)
+					context->analogOut[n*8 + gDACPinOrder[k]] = 0;
+				else
+					context->analogOut[n*8 + gDACPinOrder[k]] = ANALOG_HIGH;
+			}
+		}
+
+		// Read after 256 samples: input should be low
+		if(sampleCounter == 256) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel) {
+					if(context->analogIn[n*8 + k] < ANALOG_HIGH) {
+						rt_printf("FAIL [output %d, input %d] -- output HIGH input %f (inverted)\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+				else {
+					if(context->analogIn[n*8 + k] > ANALOG_LOW) {
+						rt_printf("FAIL [output %d, input %d] -- output LOW --> input %f\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+			}
+		}
+		else if(sampleCounter == 768) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel) {
+					if(context->analogIn[n*8 + k] > ANALOG_LOW) {
+						rt_printf("FAIL [output %d, input %d] -- output LOW input %f (inverted)\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+				else {
+					if(context->analogIn[n*8 + k] < ANALOG_HIGH) {
+						rt_printf("FAIL [output %d, input %d] -- output HIGH input %f\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+			}
+		}
+
+		if(++sampleCounter >= 1024) {
+			sampleCounter = 0;
+			invertChannel++;
+			if(invertChannel >= 8)
+				invertChannel = 0;
+		}
+	}
+}
+
+// cleanup_render() is called once at the end, after the audio has stopped.
+// Release any resources that were allocated in initialise_render().
+
+void cleanup_render(BeagleRTContext *context, void *userData)
+{
+
+}