comparison examples/d-box/render.cpp @ 300:dbeed520b014 prerelease

Renamed projects to examples

+/*
+ * render.cpp
+ *
+ *  Created on: May 28, 2014
+ *      Author: Victor Zappi
+ */
+
+#include <BeagleRT.h>
+#include <PRU.h>
+
+#include "StatusLED.h"
+#include "config.h"
+#include "OscillatorBank.h"
+#include "FeedbackOscillator.h"
+#include "ADSR.h"
+#include "FIRfilter.h"
+#include <assert.h>
+#include <cmath>
+#include <vector>
+
+#undef DBOX_CAPE_TEST
+
+// Mappings from pin numbers on PCB to actual DAC channels
+// This gives the DAC and ADC connectors the same effective pinout
+#define DAC_PIN0	6
+#define DAC_PIN1	4
+#define DAC_PIN2	2
+#define DAC_PIN3	0
+#define DAC_PIN4	1
+#define DAC_PIN5	3
+#define DAC_PIN6	5
+#define DAC_PIN7	7
+
+#define ADC_PIN0	0
+#define ADC_PIN1	1
+#define ADC_PIN2	2
+#define ADC_PIN3	3
+#define ADC_PIN4	4
+#define ADC_PIN5	5
+#define ADC_PIN6	6
+#define ADC_PIN7	7
+
+#define N_OCT		4.0	// maximum number of octaves on sensor 1
+
+extern vector<OscillatorBank*> gOscBanks;
+extern int gCurrentOscBank;
+extern int gNextOscBank;
+extern PRU *gPRU;
+extern StatusLED gStatusLED;
+extern bool gIsLoading;
+extern bool gAudioIn;
+
+float *gOscillatorBuffer1, *gOscillatorBuffer2;
+float *gOscillatorBufferRead, *gOscillatorBufferWrite;
+int gOscillatorBufferReadPointer		= 0;
+int gOscillatorBufferReadCurrentSize	= 0;
+int gOscillatorBufferWriteCurrentSize	= 0;
+bool gOscillatorNeedsRender				= false;
+
+int gMatrixSampleCount = 0;		// How many samples have elapsed on the matrix
+
+// Wavetable which changes in response to an oscillator
+float *gDynamicWavetable;
+int gDynamicWavetableLength;
+bool gDynamicWavetableNeedsRender = false;
+
+// These variables handle the hysteresis oscillator used for setting the playback speed
+bool gSpeedHysteresisOscillatorRising	= false;
+int gSpeedHysteresisLastTrigger			= 0;
+
+// These variables handle the feedback oscillator used for controlling the wavetable
+FeedbackOscillator gFeedbackOscillator;
+float *gFeedbackOscillatorTable;
+int gFeedbackOscillatorTableLength;
+
+// This comes from sensor.cpp where it records the most recent touch location on
+// sensor 0.
+extern float gSensor0LatestTouchPos;
+extern int gSensor0LatestTouchNum;
+float gPitchLatestInput = 0;
+
+extern float gSensor1LatestTouchPos[];
+//extern float gSensor1LatestTouchSizes[];
+extern int gSensor1LatestTouchCount;
+extern int gSensor1LatestTouchIndex;
+int gSensor1LastTouchIndex		= -1;
+int gSensor1InputDelayCounter	= -1;
+int gSensor1InputIndex			= 0;
+float gSensor1MatrixTouchPos[5]	= {0};
+
+// FSR value from matrix input
+extern int gLastFSRValue;
+
+// Loop points from matrix input 4
+const int gLoopPointsInputBufferSize	= 256;
+float gLoopPointsInputBuffer[gLoopPointsInputBufferSize];
+int gLoopPointsInputBufferPointer		= 0;
+float gLoopPointMin = 0, gLoopPointMax	= 0;
+
+// multiplier to activate or mute audio in
+int audioInStatus = 0;
+
+// xenomai timer
+SRTIME prevChangeNs = 0;
+
+// pitch vars
+float octaveSplitter;
+float semitones[((int)N_OCT*12)+1];
+float deltaTouch	= 0;
+float deltaWeightP	= 0.5 / 65536.0;
+float deltaWeightI	= 0.0005 / 65536.0;
+
+// filter vars
+ne10_fir_instance_f32_t filter[2];
+ne10_float32_t *filterIn[2];
+ne10_float32_t *filterOut[2];
+ne10_uint32_t blockSize;
+ne10_float32_t *filterState[2];
+ne10_float32_t prevFiltered[2];
+int filterGain = 80;
+ADSR PeakBurst[2];
+float peak[2];
+float peakThresh = 0.2;
+
+// Tasks for lower-priority calculation
+AuxiliaryTask gMediumPriorityRender, gLowPriorityRender;
+
+
+extern "C" {
+	// Function prototype for ARM assembly implementation of oscillator bank
+	void oscillator_bank_neon(int numAudioFrames, float *audioOut,
+							  int activePartialNum, int lookupTableSize,
+							  float *phases, float *frequencies, float *amplitudes,
+							  float *freqDerivatives, float *ampDerivatives,
+							  float *lookupTable);
+
+	void wavetable_interpolate_neon(int numSamplesIn, int numSamplesOut,
+	                              float *tableIn, float *tableOut);
+}
+
+void wavetable_interpolate(int numSamplesIn, int numSamplesOut,
+                              float *tableIn, float *tableOut,
+                              float *sineTable, float sineMix);
+
+inline float hysteresis_oscillator(float input, float risingThreshold,
+									float fallingThreshold, bool *rising);
+
+void render_medium_prio();
+void render_low_prio();
+
+#ifdef DBOX_CAPE_TEST
+void render_capetest(int numMatrixFrames, int numAudioFrames, float *audioIn, float *audioOut,
+			uint16_t *matrixIn, uint16_t *matrixOut);
+#endif
+
+bool setup(BeagleRTContext *context, void *userData) {
+	int oscBankHopSize = *(int *)userData;
+
+	if(context->analogChannels != 8) {
+		printf("Error: D-Box needs matrix enabled with 8 channels.\n");
+		return false;
+	}
+
+	// Allocate two buffers for rendering oscillator bank samples
+	// One will be used for writing in the background while the other is used for reading
+	// on the audio thread. 8-byte alignment needed for the NEON code.
+	if(posix_memalign((void **)&gOscillatorBuffer1, 8, oscBankHopSize * context->audioChannels * sizeof(float))) {
+		printf("Error allocating render buffers\n");
+		return false;
+	}
+	if(posix_memalign((void **)&gOscillatorBuffer2, 8, oscBankHopSize * context->audioChannels * sizeof(float))) {
+		printf("Error allocating render buffers\n");
+		return false;
+	}
+	gOscillatorBufferWrite	= gOscillatorBuffer1;
+	gOscillatorBufferRead	= gOscillatorBuffer2;
+
+	memset(gOscillatorBuffer1, 0, oscBankHopSize * context->audioChannels * sizeof(float));
+	memset(gOscillatorBuffer2, 0, oscBankHopSize * context->audioChannels * sizeof(float));
+
+	// Initialise the dynamic wavetable used by the oscillator bank
+	// It should match the size of the static one already allocated in the OscillatorBank object
+	// Don't forget a guard point at the end of the table
+	gDynamicWavetableLength = gOscBanks[gCurrentOscBank]->lookupTableSize;
+	if(posix_memalign((void **)&gDynamicWavetable, 8, (gDynamicWavetableLength + 1) * sizeof(float))) {
+		printf("Error allocating wavetable\n");
+		return false;
+	}
+
+	gFeedbackOscillator.initialise(8192, 10.0, context->analogSampleRate);
+
+	for(int n = 0; n < gDynamicWavetableLength + 1; n++)
+		gDynamicWavetable[n] = 0;
+
+	// pitch
+	float midPos		= 0.5;
+	octaveSplitter		= 1.0 / N_OCT;
+	int numOfSemi		= 12*N_OCT;
+	int middleSemitone	= 12*N_OCT/2;
+	int lastSemitone	= middleSemitone+numOfSemi/2;
+	float inc 			= 1.0 / (N_OCT*12.0);
+	int i 				= -1;
+	for(int semi=middleSemitone; semi<=lastSemitone; semi++)
+		semitones[semi] = ( midPos + (++i)*inc) + 0.5;
+	i 					= 0;
+	for(int semi=middleSemitone-1; semi>=0; semi--)
+		semitones[semi] = ( midPos - (++i)*inc) + 0.5;
+
+	if(gAudioIn)
+		audioInStatus = 1;
+
+	// filter
+	blockSize		= context->audioFrames;
+	filterState[0]	= (ne10_float32_t *) NE10_MALLOC ((FILTER_TAP_NUM+blockSize-1) * sizeof (ne10_float32_t));
+	filterState[1]	= (ne10_float32_t *) NE10_MALLOC ((FILTER_TAP_NUM+blockSize-1) * sizeof (ne10_float32_t));
+	filterIn[0]		= (ne10_float32_t *) NE10_MALLOC (blockSize * sizeof (ne10_float32_t));
+	filterIn[1]		= (ne10_float32_t *) NE10_MALLOC (blockSize * sizeof (ne10_float32_t));
+	filterOut[0]	= (ne10_float32_t *) NE10_MALLOC (blockSize * sizeof (ne10_float32_t));
+	filterOut[1]	= (ne10_float32_t *) NE10_MALLOC (blockSize * sizeof (ne10_float32_t));
+	ne10_fir_init_float(&filter[0], FILTER_TAP_NUM, filterTaps, filterState[0], blockSize);
+	ne10_fir_init_float(&filter[1], FILTER_TAP_NUM, filterTaps, filterState[1], blockSize);
+
+	// peak outputs
+	PeakBurst[0].setAttackRate(.00001 * context->analogSampleRate);
+	PeakBurst[1].setAttackRate(.00001 * context->analogSampleRate);
+	PeakBurst[0].setDecayRate(.5 * context->analogSampleRate);
+	PeakBurst[1].setDecayRate(.5 * context->analogSampleRate);
+	PeakBurst[0].setSustainLevel(0.0);
+	PeakBurst[1].setSustainLevel(0.0);
+
+	// Initialise auxiliary tasks
+	if((gMediumPriorityRender = BeagleRT_createAuxiliaryTask(&render_medium_prio, BEAGLERT_AUDIO_PRIORITY - 10, "dbox-calculation-medium")) == 0)
+		return false;
+	if((gLowPriorityRender = BeagleRT_createAuxiliaryTask(&render_low_prio, BEAGLERT_AUDIO_PRIORITY - 15, "dbox-calculation-low")) == 0)
+		return false;
+
+	return true;
+}
+
+void render(BeagleRTContext *context, void *userData)
+{
+#ifdef DBOX_CAPE_TEST
+	render_capetest(numMatrixFrames, numAudioFrames, audioIn, audioOut, matrixIn, matrixOut);
+#else
+	if(gOscBanks[gCurrentOscBank]->state==bank_toreset)
+		gOscBanks[gCurrentOscBank]->resetOscillators();
+
+	if(gOscBanks[gCurrentOscBank]->state==bank_playing)
+	{
+		assert(context->audioChannels == 2);
+
+#ifdef OLD_OSCBANK
+		memset(audioOut, 0, numAudioFrames *  * sizeof(float));
+
+		/* Render the oscillator bank. The oscillator bank function is written in NEON assembly
+		 * and it strips out all extra checks, so find out in advance whether we can render a whole
+		 * block or whether the frame will increment in the middle of this buffer.
+		 */
+
+		int framesRemaining = numAudioFrames;
+		float *audioOutWithOffset = audioOut;
+
+		while(framesRemaining > 0) {
+			if(gOscBanks[gCurrentOscBank]->hopCounter >= framesRemaining) {
+				/* More frames left in this hop than we need this time. Render and finish */
+				oscillator_bank_neon(framesRemaining, audioOutWithOffset,
+									 gOscBanks[gCurrentOscBank]->actPartNum, gOscBanks[gCurrentOscBank]->lookupTableSize,
+									 gOscBanks[gCurrentOscBank]->oscillatorPhases, gOscBanks[gCurrentOscBank]->oscillatorNormFrequencies,
+									 gOscBanks[gCurrentOscBank]->oscillatorAmplitudes,
+									 gOscBanks[gCurrentOscBank]->oscillatorNormFreqDerivatives,
+									 gOscBanks[gCurrentOscBank]->oscillatorAmplitudeDerivatives,
+									 gDynamicWavetable/*gOscBanks[gCurrentOscBank]->lookupTable*/);
+				gOscBanks[gCurrentOscBank]->hopCounter -= framesRemaining;
+				if(gOscBanks[gCurrentOscBank]->hopCounter <= 0)
+					gOscBanks[gCurrentOscBank]->nextHop();
+				framesRemaining = 0;
+			}
+			else {
+				/* More frames to render than are left in this hop. Render and decrement the
+				 * number of remaining frames; then advance to the next oscillator frame.
+				 */
+				oscillator_bank_neon(gOscBanks[gCurrentOscBank]->hopCounter, audioOutWithOffset,
+									 gOscBanks[gCurrentOscBank]->actPartNum, gOscBanks[gCurrentOscBank]->lookupTableSize,
+									 gOscBanks[gCurrentOscBank]->oscillatorPhases, gOscBanks[gCurrentOscBank]->oscillatorNormFrequencies,
+									 gOscBanks[gCurrentOscBank]->oscillatorAmplitudes,
+									 gOscBanks[gCurrentOscBank]->oscillatorNormFreqDerivatives,
+									 gOscBanks[gCurrentOscBank]->oscillatorAmplitudeDerivatives,
+									 gDynamicWavetable/*gOscBanks[gCurrentOscBank]->lookupTable*/);
+				framesRemaining -= gOscBanks[gCurrentOscBank]->hopCounter;
+				audioOutWithOffset +=  * gOscBanks[gCurrentOscBank]->hopCounter;
+				gOscBanks[gCurrentOscBank]->sampleCount += gOscBanks[gCurrentOscBank]->hopCounter;
+				gOscBanks[gCurrentOscBank]->nextHop();
+			}
+		}
+#else
+		for(unsigned int n = 0; n < context->audioFrames; n++) {
+			context->audioOut[2*n] 	  = gOscillatorBufferRead[gOscillatorBufferReadPointer++]+context->audioIn[2*n]*audioInStatus;
+			context->audioOut[2*n + 1] = gOscillatorBufferRead[gOscillatorBufferReadPointer++]+context->audioIn[2*n+1]*audioInStatus;
+
+			filterIn[0][n] = fabs(context->audioIn[2*n]);	// rectify for peak detection in 1
+			filterIn[1][n] = fabs(context->audioIn[2*n+1]);	// rectify for peak detection in 2
+
+			/* FIXME why doesn't this work? */
+			/*
+			if(gOscillatorBufferReadPointer == gOscillatorBufferCurrentSize/2) {
+				gOscillatorNeedsRender = true;
+				scheduleAuxiliaryTask(gLowPriorityRender);
+			} */
+
+			if(gOscillatorBufferReadPointer >= gOscillatorBufferReadCurrentSize) {
+				// Finished reading from the buffer: swap to the next buffer
+				if(gOscillatorBufferRead == gOscillatorBuffer1) {
+					gOscillatorBufferRead = gOscillatorBuffer2;
+					gOscillatorBufferWrite = gOscillatorBuffer1;
+				}
+				else {
+					gOscillatorBufferRead = gOscillatorBuffer1;
+					gOscillatorBufferWrite = gOscillatorBuffer2;
+				}
+
+				// New buffer size is whatever finished writing last hop
+				gOscillatorBufferReadCurrentSize = gOscillatorBufferWriteCurrentSize;
+				gOscillatorBufferReadPointer = 0;
+
+				gOscillatorNeedsRender = true;
+				BeagleRT_scheduleAuxiliaryTask(gMediumPriorityRender);
+			}
+		}
+#endif
+	}
+	else
+	{
+		for(unsigned int n = 0; n < context->audioFrames; n++) {
+			context->audioOut[2*n] 	  = context->audioIn[2*n]*audioInStatus;
+			context->audioOut[2*n + 1] = context->audioIn[2*n+1]*audioInStatus;
+
+			filterIn[0][n] = fabs(context->audioIn[2*n]);	// rectify for peak detection in 1
+			filterIn[1][n] = fabs(context->audioIn[2*n+1]);	// rectify for peak detection in 2
+		}
+	}
+
+	// low pass filter audio in 1 and 2 for peak detection
+	ne10_fir_float_neon(&filter[0], filterIn[0], filterOut[0], blockSize);
+	ne10_fir_float_neon(&filter[1], filterIn[1], filterOut[1], blockSize);
+
+	for(unsigned int n = 0; n < context->analogFrames; n++) {
+
+
+		/* Matrix Out 0, In 0
+		 *
+		 * CV loop
+		 * Controls pitch of sound
+		 */
+		float touchPosInt = gSensor0LatestTouchPos;
+		if(touchPosInt < 0) touchPosInt = 0;
+		if(touchPosInt > 1.0) touchPosInt = 1.0;
+		context->analogOut[n*8 + DAC_PIN0] = touchPosInt;
+
+		gPitchLatestInput = context->analogIn[n*8 + ADC_PIN0];
+
+
+		/* Matrix Out 7
+		 *
+		 * Loop feedback with Matrix In 0
+		 * Controls discreet pitch
+		 */
+		float deltaTarget = 0;
+		int semitoneIndex = 0;
+		if(gSensor0LatestTouchNum>0)
+		{
+			// current pitch is gPitchLatestInput, already retrieved
+			semitoneIndex	= ( gPitchLatestInput * 12 * N_OCT  )+0.5;	// closest semitone
+			deltaTarget		= (semitones[semitoneIndex]-gPitchLatestInput);				// delta between pitch and target
+			deltaTouch 		+= deltaTarget*(deltaWeightI);								// update feedback [previous + current]
+		}
+		else
+			deltaTouch = 0;
+
+		float nextOut = touchPosInt  + deltaTarget*deltaWeightP + deltaTouch;			// add feedback to touch -> next out
+		if(nextOut < 0) nextOut = 0;												// clamp
+		if(nextOut > 1.0) nextOut = 1.0;										// clamp
+		context->analogOut[n*8 + DAC_PIN7] = nextOut;										// send next nextOut
+
+
+		/*
+		 * Matrix Out 1, In 1
+		 *
+		 * Hysteresis (comparator) oscillator
+		 * Controls speed of playback
+		 */
+		bool wasRising = gSpeedHysteresisOscillatorRising;
+		context->analogOut[n*8 + DAC_PIN1] = hysteresis_oscillator(context->analogIn[n*8 + ADC_PIN1], 48000.0/65536.0,
+																	16000.0/65536.0, &gSpeedHysteresisOscillatorRising);
+
+		// Find interval of zero crossing
+		if(wasRising && !gSpeedHysteresisOscillatorRising) {
+			int interval = gMatrixSampleCount - gSpeedHysteresisLastTrigger;
+
+			// Interval since last trigger will be the new hop size; calculate to set speed
+			if(interval < 1)
+				interval = 1;
+			//float speed = (float)gOscBanks[gCurrentOscBank]->getHopSize() / (float)interval;
+			float speed = 144.0 / interval;	// Normalise to a fixed expected speed
+			gOscBanks[gCurrentOscBank]->setSpeed(speed);
+
+			gSpeedHysteresisLastTrigger = gMatrixSampleCount;
+		}
+
+		/*
+		 * Matrix Out 2, In 2
+		 *
+		 * Feedback (phase shift) oscillator
+		 * Controls wavetable used for oscillator bank
+		 */
+
+		int tableLength = gFeedbackOscillator.process(context->analogIn[n*8 + ADC_PIN2], &context->analogOut[n*8 + DAC_PIN2]);
+		if(tableLength != 0) {
+			gFeedbackOscillatorTableLength = tableLength;
+			gFeedbackOscillatorTable = gFeedbackOscillator.wavetable();
+			gDynamicWavetableNeedsRender = true;
+			BeagleRT_scheduleAuxiliaryTask(gLowPriorityRender);
+		}
+
+		/*
+		 * Matrix Out 3, In 3
+		 *
+		 * CV loop with delay for time alignment
+		 * Touch positions from sensor 1
+		 * Change every 32 samples (ca. 1.5 ms)
+		 */
+		volatile int touchCount = gSensor1LatestTouchCount;
+		if(touchCount == 0)
+			context->analogOut[n*8 + DAC_PIN3] = 0;
+		else {
+			int touchIndex = (gMatrixSampleCount >> 5) % touchCount;
+			context->analogOut[n*8 + DAC_PIN3] = gSensor1LatestTouchPos[touchIndex] * 56000.0f / 65536.0f;
+			if(touchIndex != gSensor1LastTouchIndex) {
+				// Just changed to a new touch output. Reset the counter.
+				// It will take 2*matrixFrames samples for this output to come back to the
+				// ADC input. But we also want to read near the end of the 32 sample block;
+				// let's say 24 samples into it.
+
+				// FIXME this won't work for p > 2
+				gSensor1InputDelayCounter = 24 + 2*context->analogFrames;
+				gSensor1InputIndex = touchIndex;
+			}
+			gSensor1LastTouchIndex = touchIndex;
+		}
+
+		if(gSensor1InputDelayCounter-- >= 0 && touchCount > 0) {
+			gSensor1MatrixTouchPos[gSensor1InputIndex] = context->analogIn[n*8 + ADC_PIN3];
+		}
+
+		/* Matrix Out 4
+		 *
+		 * Sensor 1 last pos
+		 */
+		touchPosInt = gSensor1LatestTouchPos[gSensor1LatestTouchIndex];
+		if(touchPosInt < 0) touchPosInt = 0;
+		if(touchPosInt > 1.0) touchPosInt = 1.0;
+		context->analogOut[n*8 + DAC_PIN4] = touchPosInt;
+
+		/* Matrix In 4
+		 *
+		 * Loop points selector
+		 */
+		gLoopPointsInputBuffer[gLoopPointsInputBufferPointer++] = context->analogIn[n*8 + ADC_PIN4];
+		if(gLoopPointsInputBufferPointer >= gLoopPointsInputBufferSize) {
+			// Find min and max values
+			float loopMax = 0, loopMin = 1.0;
+			for(int i = 0; i < gLoopPointsInputBufferSize; i++) {
+				if(gLoopPointsInputBuffer[i] < loopMin)
+					loopMin = gLoopPointsInputBuffer[i];
+				if(gLoopPointsInputBuffer[i] > loopMax/* && gLoopPointsInputBuffer[i] != 65535*/)
+					loopMax = gLoopPointsInputBuffer[i];
+			}
+
+			if(loopMin >= loopMax)
+				loopMax = loopMin;
+
+			gLoopPointMax = loopMax;
+			gLoopPointMin = loopMin;
+			gLoopPointsInputBufferPointer = 0;
+		}
+
+		/* Matrix Out 5
+		 *
+		 * Audio In 1 peak detection and peak burst output
+		 */
+
+		filterOut[0][n*2+1]	*= filterGain;
+		float burstOut		= PeakBurst[0].getOutput();
+		if( burstOut < 0.1)
+		{
+			if( (prevFiltered[0]>=peakThresh) && (prevFiltered[0]>=filterOut[0][n*2+1]) )
+			{
+				peak[0] = prevFiltered[0];
+				PeakBurst[0].gate(1);
+			}
+		}
+
+		PeakBurst[0].process(1);
+
+		float convAudio = burstOut*peak[0];
+		context->analogOut[n*8 + DAC_PIN5] = convAudio;
+		prevFiltered[0] = filterOut[0][n*2+1];
+		if(prevFiltered[0]>1)
+			prevFiltered[0] = 1;
+
+		/* Matrix In 5
+		 *
+		 * Dissonance, via changing frequency motion of partials
+		 */
+		float amount = (float)context->analogIn[n*8 + ADC_PIN5];
+		gOscBanks[gCurrentOscBank]->freqMovement = 1.0 - amount;
+
+
+
+
+		/* Matrix Out 6
+		 *
+		 * Audio In 2 peak detection and peak burst output
+		 */
+
+		filterOut[1][n*2+1]	*= filterGain;
+		burstOut			= PeakBurst[1].getOutput();
+		if( burstOut < 0.1)
+		{
+			if( (prevFiltered[1]>=peakThresh) && (prevFiltered[1]>=filterOut[1][n*2+1]) )
+			{
+				peak[1] = prevFiltered[1];
+				PeakBurst[1].gate(1);
+			}
+		}
+
+		PeakBurst[1].process(1);
+
+		convAudio = burstOut*peak[1];
+		context->analogOut[n*8 + DAC_PIN6] = convAudio;
+		prevFiltered[1] = filterOut[1][n*2+1];
+		if(prevFiltered[1]>1)
+			prevFiltered[1] = 1;
+
+		/* Matrix In 6
+		 *
+		 * Sound selector
+		 */
+		if(!gIsLoading) {
+			// Use hysteresis to avoid jumping back and forth between sounds
+			if(gOscBanks.size() > 1) {
+				float input = context->analogIn[n*8 + ADC_PIN6];
+				const float hystValue = 16000.0 / 65536.0;
+
+				float upHysteresisValue = ((gCurrentOscBank + 1) + hystValue) / gOscBanks.size();
+				float downHysteresisValue = (gCurrentOscBank - hystValue) / gOscBanks.size();
+
+				if(input > upHysteresisValue || input < downHysteresisValue) {
+					gNextOscBank = input * gOscBanks.size();
+					if(gNextOscBank < 0)
+						gNextOscBank = 0;
+					if((unsigned)gNextOscBank >= gOscBanks.size())
+						gNextOscBank = gOscBanks.size() - 1;
+				}
+			}
+		}
+
+		/*
+		 * Matrix In 7
+		 *
+		 * FSR from primary touch sensor
+		 * Value ranges from 0-1799
+		 */
+		gLastFSRValue = context->analogIn[n*8 + ADC_PIN7] * 1799.0;
+		//gLastFSRValue = 1799 - context->analogIn[n*8 + ADC_PIN7] * (1799.0 / 65535.0);
+		//dbox_printf("%i\n",gLastFSRValue);
+
+		gMatrixSampleCount++;
+	}
+
+#endif /* DBOX_CAPE_TEST */
+}
+
+// Medium-priority render function used for audio hop calculations
+void render_medium_prio()
+{
+
+	if(gOscillatorNeedsRender) {
+		gOscillatorNeedsRender = false;
+
+		/* Render one frame into the write buffer */
+		memset(gOscillatorBufferWrite, 0, gOscBanks[gCurrentOscBank]->hopCounter * 2 * sizeof(float)); /* assumes 2 audio channels */
+
+		oscillator_bank_neon(gOscBanks[gCurrentOscBank]->hopCounter, gOscillatorBufferWrite,
+							 gOscBanks[gCurrentOscBank]->actPartNum, gOscBanks[gCurrentOscBank]->lookupTableSize,
+							 gOscBanks[gCurrentOscBank]->oscillatorPhases, gOscBanks[gCurrentOscBank]->oscillatorNormFrequencies,
+							 gOscBanks[gCurrentOscBank]->oscillatorAmplitudes,
+							 gOscBanks[gCurrentOscBank]->oscillatorNormFreqDerivatives,
+							 gOscBanks[gCurrentOscBank]->oscillatorAmplitudeDerivatives,
+							 /*gOscBanks[gCurrentOscBank]->lookupTable*/gDynamicWavetable);
+
+		gOscillatorBufferWriteCurrentSize = gOscBanks[gCurrentOscBank]->hopCounter * 2;
+
+		/* Update the pitch right before the hop
+		 * Total CV range +/- N_OCT octaves
+		 */
+		float pitch = (float)gPitchLatestInput / octaveSplitter - N_OCT/2;
+		//gOscBanks[gCurrentOscBank]->pitchMultiplier = powf(2.0f, pitch);
+		gOscBanks[gCurrentOscBank]->pitchMultiplier = pow(2.0f, pitch);
+
+#ifdef FIXME_LATER // This doesn't work very well yet
+		gOscBanks[gCurrentOscBank]->filterNum = gSensor1LatestTouchCount;
+		float freqScaler = gOscBanks[gCurrentOscBank]->getFrequencyScaler();
+		for(int i=0; i < gOscBanks[gCurrentOscBank]->filterNum; i++)
+		{
+			// touch pos is linear but freqs are log
+			gOscBanks[gCurrentOscBank]->filterFreqs[i] = ((expf(gSensor1MatrixTouchPos[i]*4)-1)/(expf(4)-1))*gOscBanks[gCurrentOscBank]->filterMaxF*freqScaler;
+			gOscBanks[gCurrentOscBank]->filterQ[i] = gSensor1LatestTouchSizes[i];
+			if(gOscBanks[gCurrentOscBank]->filterFreqs[i]>500*freqScaler)
+				gOscBanks[gCurrentOscBank]->filterPadding[i] = 1+100000*( (gOscBanks[gCurrentOscBank]->filterFreqs[i]-500*freqScaler)/(gOscBanks[gCurrentOscBank]->filterMaxF-500)*freqScaler );
+			else
+				gOscBanks[gCurrentOscBank]->filterPadding[i] = 1;
+		}
+#endif
+
+		RTIME ticks		= rt_timer_read();
+		SRTIME ns		= rt_timer_tsc2ns(ticks);
+		SRTIME delta 	= ns-prevChangeNs;
+
+		// switch to next bank cannot be too frequent, to avoid seg fault! [for example sef fault happens when removing both VDD and GND from breadboard]
+		if(gNextOscBank != gCurrentOscBank && delta>100000000) {
+
+			/*printf("ticks %llu\n", (unsigned long long)ticks);
+			printf("ns %llu\n", (unsigned long long)ns);
+			printf("prevChangeNs %llu\n", (unsigned long long)prevChangeNs);
+			printf("-------------------------->%llud\n", (unsigned long long)(ns-prevChangeNs));*/
+
+			prevChangeNs = ns;
+			dbox_printf("Changing to bank %d...\n", gNextOscBank);
+			if(gOscBanks[gCurrentOscBank]->state==bank_playing){
+				gOscBanks[gCurrentOscBank]->stop();
+			}
+
+			gCurrentOscBank = gNextOscBank;
+			gOscBanks[gCurrentOscBank]->hopNumTh = 0;
+		}
+		else {
+			/* Advance to the next oscillator frame */
+			gOscBanks[gCurrentOscBank]->nextHop();
+		}
+	}
+}
+
+// Lower-priority render function which performs matrix calculations
+// State should be transferred in via global variables
+void render_low_prio()
+{
+	gPRU->setGPIOTestPin();
+	if(gDynamicWavetableNeedsRender) {
+		// Find amplitude of wavetable
+		float meanAmplitude = 0;
+		float sineMix;
+
+		for(int i = 0; i < gFeedbackOscillatorTableLength; i++) {
+			//meanAmplitude += fabsf(gFeedbackOscillatorTable[i]);
+			meanAmplitude += fabs(gFeedbackOscillatorTable[i]);
+		}
+		meanAmplitude /= (float)gFeedbackOscillatorTableLength;
+
+		if(meanAmplitude > 0.35)
+			sineMix = 0;
+		else
+			sineMix = (.35 - meanAmplitude) / .35;
+
+		//dbox_printf("amp %f mix %f\n", meanAmplitude, sineMix);
+
+		// Copy to main wavetable
+		wavetable_interpolate(gFeedbackOscillatorTableLength, gDynamicWavetableLength,
+				gFeedbackOscillatorTable, gDynamicWavetable,
+				gOscBanks[gCurrentOscBank]->lookupTable, sineMix);
+	}
+
+	if(gLoopPointMin >= 60000.0/65536.0 && gLoopPointMax >= 60000.0/65536.0) {
+		// KLUDGE!
+		if(gCurrentOscBank == 0)
+			gOscBanks[gCurrentOscBank]->setLoopHops(50, ((float)gOscBanks[gCurrentOscBank]->getLastHop() * 0.6) - 1);
+		else
+			gOscBanks[gCurrentOscBank]->setLoopHops(5, ((float)gOscBanks[gCurrentOscBank]->getLastHop() * 0.7) - 1);
+	}
+	else {
+		float normLoopPointMin = (float)gLoopPointMin * gOscBanks[gCurrentOscBank]->getLastHop();
+		float normLoopPointMax = (float)gLoopPointMax * gOscBanks[gCurrentOscBank]->getLastHop();
+
+		int intLoopPointMin = normLoopPointMin;
+		if(intLoopPointMin < 1)
+			intLoopPointMin = 1;
+		int intLoopPointMax = normLoopPointMax;
+		if(intLoopPointMax <= intLoopPointMin)
+			intLoopPointMax = intLoopPointMin + 1;
+		if(intLoopPointMax > gOscBanks[gCurrentOscBank]->getLastHop() - 1)
+			intLoopPointMax =  gOscBanks[gCurrentOscBank]->getLastHop() - 1;
+
+		//dbox_printf("Loop points %d-%d / %d-%d\n", gLoopPointMin, gLoopPointMax, intLoopPointMin, intLoopPointMax);
+
+		/* WORKS, jsut need to fix the glitch when jumps!
+		 * *int currentHop = gOscBanks[gCurrentOscBank]->getCurrentHop();
+		if(currentHop < intLoopPointMin -1 )
+			gOscBanks[gCurrentOscBank]->setJumpHop(intLoopPointMin + 1);
+		else if(currentHop > intLoopPointMax + 1)
+			gOscBanks[gCurrentOscBank]->setJumpHop(intLoopPointMax - 1);*/
+		gOscBanks[gCurrentOscBank]->setLoopHops(intLoopPointMin, intLoopPointMax);
+	}
+
+	if(gIsLoading)
+		gStatusLED.blink(25, 75);	// Blink quickly until load finished
+	else
+		gStatusLED.blink(250 / gOscBanks[gCurrentOscBank]->getSpeed(), 250 / gOscBanks[gCurrentOscBank]->getSpeed());
+	gPRU->clearGPIOTestPin();
+
+//	static int counter = 32;
+//	if(--counter == 0) {
+//		for(int i = 0; i < gLoopPointsInputBufferSize; i++) {
+//			dbox_printf("%d ", gLoopPointsInputBuffer[i]);
+//			if(i % 32 == 31)
+//				dbox_printf("\n");
+//		}
+//		dbox_printf("\n\n");
+//		counter = 32;
+//	}
+
+	//dbox_printf("min %d max %d\n", gLoopPointMin, gLoopPointMax);
+}
+
+// Clean up at the end of render
+void cleanup(BeagleRTContext *context, void *userData)
+{
+	free(gOscillatorBuffer1);
+	free(gOscillatorBuffer2);
+	free(gDynamicWavetable);
+}
+
+// Interpolate one wavetable into another. The output size
+// does not include the guard point at the end which will be identical
+// to the first point
+void wavetable_interpolate(int numSamplesIn, int numSamplesOut,
+                           float *tableIn, float *tableOut,
+                           float *sineTable, float sineMix)
+{
+	float fractionalScaler = (float)numSamplesIn / (float)numSamplesOut;
+
+	for(int k = 0; k < numSamplesOut; k++) {
+		float fractionalIndex = (float) k * fractionalScaler;
+		//int sB = (int)floorf(fractionalIndex);
+		int sB = (int)floor(fractionalIndex);
+		int sA = sB + 1;
+		if(sA >= numSamplesIn)
+			sA = 0;
+		float fraction = fractionalIndex - sB;
+		tableOut[k] = fraction * tableIn[sA] + (1.0f - fraction) * tableIn[sB];
+		tableOut[k] = sineMix * sineTable[k] + (1.0 - sineMix) * tableOut[k];
+	}
+
+	tableOut[numSamplesOut] = tableOut[0];
+}
+
+// Create a hysteresis oscillator with a matrix input and output
+inline float hysteresis_oscillator(float input, float risingThreshold, float fallingThreshold, bool *rising)
+{
+	float value;
+
+	if(*rising) {
+		if(input > risingThreshold) {
+			*rising = false;
+			value = 0;
+		}
+		else
+			value = 1.0;
+	}
+	else {
+		if(input < fallingThreshold) {
+			*rising = true;
+			value = 1.0;
+		}
+		else
+			value = 0;
+	}
+
+	return value;
+}
+
+#ifdef DBOX_CAPE_TEST
+// Test the functionality of the D-Box cape by checking each input and output
+// Loopback cable from ADC to DAC needed
+void render_capetest(int numMatrixFrames, int numAudioFrames, float *audioIn, float *audioOut,
+			uint16_t *matrixIn, uint16_t *matrixOut)
+{
+	static float phase = 0.0;
+	static int sampleCounter = 0;
+	static int invertChannel = 0;
+
+	// Play a sine wave on the audio output
+	for(int n = 0; n < numAudioFrames; n++) {
+		audioOut[2*n] = audioOut[2*n + 1] = 0.5*sinf(phase);
+		phase += 2.0 * M_PI * 440.0 / 44100.0;
+		if(phase >= 2.0 * M_PI)
+			phase -= 2.0 * M_PI;
+	}
+
+	for(int n = 0; n < numMatrixFrames; n++) {
+		// Change outputs every 512 samples
+		if(sampleCounter < 512) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel)
+					matrixOut[n*8 + k] = 50000;
+				else
+					matrixOut[n*8 + k] = 0;
+			}
+		}
+		else {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel)
+					matrixOut[n*8 + k] = 0;
+				else
+					matrixOut[n*8 + k] = 50000;
+			}
+		}
+
+		// Read after 256 samples: input should be low
+		if(sampleCounter == 256) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel) {
+					if(matrixIn[n*8 + k] < 50000) {
+						dbox_printf("FAIL channel %d -- output HIGH input %d (inverted)\n", k, matrixIn[n*8 + k]);
+					}
+				}
+				else {
+					if(matrixIn[n*8 + k] > 2048) {
+						dbox_printf("FAIL channel %d -- output LOW input %d\n", k, matrixIn[n*8 + k]);
+					}
+				}
+			}
+		}
+		else if(sampleCounter == 768) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel) {
+					if(matrixIn[n*8 + k] > 2048) {
+						dbox_printf("FAIL channel %d -- output LOW input %d (inverted)\n", k, matrixIn[n*8 + k]);
+					}
+				}
+				else {
+					if(matrixIn[n*8 + k] < 50000) {
+						dbox_printf("FAIL channel %d -- output HIGH input %d\n", k, matrixIn[n*8 + k]);
+					}
+				}
+			}
+		}
+
+		if(++sampleCounter >= 1024) {
+			sampleCounter = 0;
+			invertChannel++;
+			if(invertChannel >= 8)
+				invertChannel = 0;
+		}
+	}
+}
+#endif
+
+