Segmentation fault Error 139 - Custom render MPR121

catwizard

Working on a project that needs to read data from an Adafruit MPR121, using Pd. I swear I got this working before but I cannot figure out what is wrong with my custom render file. I keep getting a segmentation fault error. I am just trying to pass the sensor values to Pd to then print to console & confirm that they're getting into Pd. This part of the code is not the issue because when I comment it out and use a different _main.pd file I get the same error. There's something wrong with the MPR121 code or how I'm handling it. (I am not super knowledgeable about coding). Can someone please help?! The demo MPR121 code works fine.

/*
 * Default render file for Bela projects running Pd patches
 * using libpd.
 
 MODIFIED -- MPR121
 additions will be noted
 */
#include <Bela.h>

//MODIFIED
#include <cmath>
#include "I2C_MPR121.h"

#define NUM_TOUCH_PINS 12
// Define this to print data to terminal
#undef DEBUG_MPR121
//

// Enable features here. These may be undef'ed below if the corresponding
// BELA_LIBPD_DISABLE_* flag is passed
#define BELA_LIBPD_SCOPE
#define BELA_LIBPD_MIDI
#define BELA_LIBPD_TRILL
#define BELA_LIBPD_GUI
#define BELA_LIBPD_SERIAL

#ifdef BELA_LIBPD_DISABLE_SCOPE
#undef BELA_LIBPD_SCOPE
#endif // BELA_LIBPD_DISABLE_SCOPE
#ifdef BELA_LIBPD_DISABLE_MIDI
#undef BELA_LIBPD_MIDI
#endif // BELA_LIBPD_DISABLE_MIDI
#ifdef BELA_LIBPD_DISABLE_TRILL
#undef BELA_LIBPD_TRILL
#endif // BELA_LIBPD_DISABLE_TRILL
#ifdef BELA_LIBPD_DISABLE_GUI
#undef BELA_LIBPD_GUI
#endif // BELA_LIBPD_DISABLE_GUI
#ifdef BELA_LIBPD_DISABLE_SERIAL
#undef BELA_LIBPD_SERIAL
#endif // BELA_LIBPD_DISABLE_SERIAL

#define PD_THREADED_IO
#include <libraries/libpd/libpd.h>
#include <DigitalChannelManager.h>
#include <stdio.h>

//MODIFIED
// Change this to change how often the MPR121 is read (in Hz)
int readInterval = 40;
// Change this threshold to set the minimum amount of touch
int threshold = 40;
// This array holds the continuous sensor values
int sensorValue[NUM_TOUCH_PINS];

I2C_MPR121 mpr121;                      // Object to handle MPR121 sensing
AuxiliaryTask i2cTask;          // Auxiliary task to read I2C
int readCount = 0;                      // How long until we read again...
int readIntervalSamples = 0; // How many samples between reads
void readMPR121(void*);


//

#ifdef BELA_LIBPD_MIDI
#include <libraries/Midi/Midi.h>
#endif // BELA_LIBPD_MIDI
#ifdef BELA_LIBPD_SCOPE
#include <libraries/Scope/Scope.h>
#endif // BELA_LIBPD_SCOPE
#include <string>
#include <sstream>
#include <string.h>
#include <vector>

#if (defined(BELA_LIBPD_GUI) || defined(BELA_LIBPD_TRILL))
#include <libraries/Pipe/Pipe.h>
template <typename T>
int getIdxFromId(const char* id, std::vector<std::pair<std::string,T>>& db)
{
	for(unsigned int n = 0; n < db.size(); ++n)
	{
		if(0 == strcmp(id, db[n].first.c_str()))
			return n;
	}
	return -1;
}
#endif // BELA_LIBPD_GUI || BELA_LIBPD_TRILL

#ifdef BELA_LIBPD_TRILL
#include <tuple>
#include <libraries/Trill/Trill.h>
AuxiliaryTask gTrillTask;
Pipe gTrillPipe;

static std::vector<std::string> gTrillAcks;
static std::vector<std::pair<std::string,Trill*>> gTouchSensors;
// how often to read the cap sensors inputs.
float touchSensorSleepInterval = 0.007;

void readTouchSensors(void*)
{
	for(unsigned int n = 0; n < gTouchSensors.size(); ++n)
	{
		Trill& touchSensor = *gTouchSensors[n].second;
		int ret;
		const Trill::Device type = touchSensor.deviceType();
		if(Trill::NONE == type)
			ret = 1;
		else
			ret = touchSensor.readI2C();
		if(!ret)
		{
			gTrillPipe.writeNonRt(n);
		}
	}
}
#endif // BELA_LIBPD_TRILL

#ifdef BELA_LIBPD_GUI
#include <libraries/Gui/Gui.h>

Pipe gGuiPipe;
Gui gui;
struct bufferDescription
{
	std::string name;
	int id;
	int size;
};
static std::vector<struct bufferDescription> gGuiDataBuffers;
static std::vector<std::string> gGuiControlBuffers;
struct guiControlMessageHeader
{
	uint32_t size;
	uint32_t type;
	uint32_t id;
};

bool guiControlDataCallback(JSONObject& root, void* arg)
{
	int ret = true;
	for(unsigned int n = 0; n < gGuiControlBuffers.size(); ++n)
	{
		const auto& b = gGuiControlBuffers[n];
		std::wstring key = JSON::s2ws(b);
		if (root.end() != root.find(key))
		{
			JSONValue* found = root[key];
			struct guiControlMessageHeader header;
			header.id = n;
			char* array;
			if(found->IsString())
			{
				std::string value = JSON::ws2s(found->AsString());
				header.type = 's';
				header.size = value.size();
				array = (char*)alloca(header.size);
				memcpy(array, value.c_str(), header.size);
			} else if(found->IsNumber())
			{
				float value = found->AsNumber();
				header.type = 'f';
				header.size = sizeof(value);
				array = (char*)alloca(header.size);
				memcpy(array, &value, header.size);
			} else {
				continue;
			}
			// do two separate reads: the pipe is datagram-based
			// so it would be impossible to receive partial messages
			// at the other end
			gGuiPipe.writeNonRt(header);
			gGuiPipe.writeNonRt(&array[0], header.size);
			// we have successully parsed this message, so the
			// default parser shouldn't when we return
			// note: in practice there may be times when we'd want
			// to have the default parser handle this message
			// (e.g.: when an "event" field is also present), but
			// for now we ignore them
			ret = false;
			continue;
		}
	}
	return ret;
}

#endif // BELA_LIBPD_GUI
#ifdef BELA_LIBPD_SERIAL
#include <libraries/Serial/Serial.h>
#include <libraries/Pipe/Pipe.h>
#include <string>

Pipe gSerialPipe;
Serial gSerial;
std::string gSerialId;
int gSerialEom;
enum SerialType {
	kSerialFloats,
	kSerialSymbol,
	kSerialSymbols,
} gSerialType = kSerialFloats;
AuxiliaryTask gSerialInputTask;
AuxiliaryTask gSerialOutputTask;

struct serialMessageHeader
{
	uint32_t idSize;
	uint32_t dataSize;
};

void serialOutputLoop(void* arg) {
	// TODO: implement
}

void serialInputLoop(void* arg) {
	char serialBuffer[10000];
	unsigned int i = 0;
	serialMessageHeader h = {
		.idSize = strlen(gSerialId.c_str()) + 1,
	};
	while(!Bela_stopRequested())
	{
		// read from the serial port with a timeout of 100ms
		int ret = gSerial.read(serialBuffer + i, sizeof(serialBuffer) - i, 100);
		if (ret > 0) {
			if(gSerialEom < 0)
			{
				h.dataSize = ret;
				// send everything immediately
				gSerialPipe.writeNonRt(h);
				gSerialPipe.writeNonRt(gSerialId.c_str(), h.idSize);
				gSerialPipe.writeNonRt(serialBuffer, h.dataSize);
			} else {
				// find EOM in new data
				unsigned int searchStart = i;
				unsigned int searchStop = searchStart + ret;
				unsigned int n;
				unsigned int lastSent = 0;
				bool found;
				do
				{
					found = false;
					for(n = searchStart; n < searchStop; ++n)
					{
						if(serialBuffer[n] == gSerialEom)
						{
							found = true;
							break;
						}
					}
					// if found, send all data till that point
					if(found)
					{
						h.dataSize = n - lastSent;
						if(h.dataSize)
						{
							gSerialPipe.writeNonRt(h);
							gSerialPipe.writeNonRt(gSerialId.c_str(), h.idSize);
							gSerialPipe.writeNonRt(serialBuffer + lastSent, h.dataSize);
						}
						searchStart = n + 1;
						lastSent += 1 + h.dataSize;
					}
				}
				while(found);
				// if we are left with any data, move it to the beginning of the buffer.
				// TODO: avoid this and use it as a circular buffer
				if(searchStart != i)
					memmove(serialBuffer, serialBuffer + searchStart, searchStop - searchStart);
				i = searchStop - searchStart;
			}
		}
	}
}

#endif // BELA_LIBPD_SERIAL

enum { minFirstDigitalChannel = 10 };
static unsigned int gAnalogChannelsInUse;
static unsigned int gDigitalChannelsInUse;
#ifdef BELA_LIBPD_SCOPE
static unsigned int gScopeChannelsInUse = 4;
#else // BELA_LIBPD_SCOPE
static unsigned int gScopeChannelsInUse = 0;
#endif // BELA_LIBPD_SCOPE
static unsigned int gLibpdBlockSize;
static unsigned int gChannelsInUse;
//static const unsigned int gFirstAudioChannel = 0;
static unsigned int gFirstAnalogInChannel;
static unsigned int gFirstAnalogOutChannel;
static unsigned int gFirstDigitalChannel;
static unsigned int gLibpdDigitalChannelOffset;
static unsigned int gFirstScopeChannel;

void Bela_userSettings(BelaInitSettings *settings)
{
	settings->uniformSampleRate = 1;
	settings->interleave = 0;
	settings->analogOutputsPersist = 0;
}

float* gInBuf;
float* gOutBuf;
#ifdef BELA_LIBPD_MIDI
#define PARSE_MIDI
static std::vector<Midi*> midi;
std::vector<std::string> gMidiPortNames;
int gMidiVerbose = 1;
const int kMidiVerbosePrintLevel = 1;

void dumpMidi()
{
	if(midi.size() == 0)
	{
		printf("No MIDI device enabled\n");
		return;
	}
	printf("The following MIDI devices are enabled:\n");
	printf("%4s%20s %3s %3s %s\n",
			"Num",
			"Name",
			"In",
			"Out",
			"Pd channels"
	      );
	for(unsigned int n = 0; n < midi.size(); ++n)
	{
		printf("[%2d]%20s %3s %3s (%d-%d)\n", 
			n,
			gMidiPortNames[n].c_str(),
			midi[n]->isInputEnabled() ? "x" : "_",
			midi[n]->isOutputEnabled() ? "x" : "_",
			n * 16 + 1,
			n * 16 + 16
		);
	}
}

Midi* openMidiDevice(std::string name, bool verboseSuccess = false, bool verboseError = false)
{
	Midi* newMidi;
	newMidi = new Midi();
	newMidi->readFrom(name.c_str());
	newMidi->writeTo(name.c_str());
#ifdef PARSE_MIDI
	newMidi->enableParser(true);
#else
	newMidi->enableParser(false);
#endif /* PARSE_MIDI */
	if(newMidi->isOutputEnabled())
	{
		if(verboseSuccess)
			printf("Opened MIDI device %s as output\n", name.c_str());
	}
	if(newMidi->isInputEnabled())
	{
		if(verboseSuccess)
			printf("Opened MIDI device %s as input\n", name.c_str());
	}
	if(!newMidi->isInputEnabled() && !newMidi->isOutputEnabled())
	{
		if(verboseError)
			fprintf(stderr, "Failed to open  MIDI device %s\n", name.c_str());
		return nullptr;
	} else {
		return newMidi;
	}
}

static unsigned int getPortChannel(int* channel){
	unsigned int port = 0;
	while(*channel >= 16){
		*channel -= 16;
		port += 1;
	}
	return port;
}

void Bela_MidiOutNoteOn(int channel, int pitch, int velocity) {
	unsigned int port = getPortChannel(&channel);
	if(gMidiVerbose >= kMidiVerbosePrintLevel)
		rt_printf("noteout _ port: %d, channel: %d, pitch: %d, velocity %d\n", port, channel, pitch, velocity);
	port < midi.size() && midi[port]->writeNoteOn(channel, pitch, velocity);
}

void Bela_MidiOutControlChange(int channel, int controller, int value) {
	unsigned int port = getPortChannel(&channel);
	if(gMidiVerbose >= kMidiVerbosePrintLevel)
		rt_printf("ctlout _ port: %d, channel: %d, controller: %d, value: %d\n", port, channel, controller, value);
	port < midi.size() && midi[port]->writeControlChange(channel, controller, value);
}

void Bela_MidiOutProgramChange(int channel, int program) {
	unsigned int port = getPortChannel(&channel);
	if(gMidiVerbose >= kMidiVerbosePrintLevel)
		rt_printf("pgmout _ port: %d, channel: %d, program: %d\n", port, channel, program);
	port < midi.size() && midi[port]->writeProgramChange(channel, program);
}

void Bela_MidiOutPitchBend(int channel, int value) {
	unsigned int port = getPortChannel(&channel);
	if(gMidiVerbose >= kMidiVerbosePrintLevel)
		rt_printf("bendout _ port: %d, channel: %d, value: %d\n", port, channel, value);
	value += 8192; // correct for Pd's oddity
	port < midi.size() && midi[port]->writePitchBend(channel, value);
}

void Bela_MidiOutAftertouch(int channel, int pressure){
	unsigned int port = getPortChannel(&channel);
	if(gMidiVerbose >= kMidiVerbosePrintLevel)
		rt_printf("touchout _ port: %d, channel: %d, pressure: %d\n", port, channel, pressure);
	port < midi.size() && midi[port]->writeChannelPressure(channel, pressure);
}

void Bela_MidiOutPolyAftertouch(int channel, int pitch, int pressure){
	unsigned int port = getPortChannel(&channel);
	if(gMidiVerbose >= kMidiVerbosePrintLevel)
		rt_printf("polytouchout _ port: %d, channel: %d, pitch: %d, pressure: %d\n", port, channel, pitch, pressure);
	port < midi.size() && midi[port]->writePolyphonicKeyPressure(channel, pitch, pressure);
}

void Bela_MidiOutByte(int port, int byte){
	if(gMidiVerbose >= kMidiVerbosePrintLevel)
		rt_printf("port: %d, byte: %d\n", port, byte);
	if(port > (int)midi.size()){
		// if the port is out of range, redirect to the first port.
		rt_fprintf(stderr, "Port out of range, using port 0 instead\n");
		port = 0;
	}
	port < (int)midi.size() && midi[port]->writeOutput(byte);
}
#endif // BELA_LIBPD_MIDI

void Bela_printHook(const char *received){
	rt_printf("%s", received);
}

static DigitalChannelManager dcm;

void sendDigitalMessage(bool state, unsigned int delay, void* receiverName){
	libpd_float((const char*)receiverName, (float)state);
//	rt_printf("%s: %d\n", (char*)receiverName, state);
}

#ifdef BELA_LIBPD_TRILL
void setTrillPrintError()
{
	rt_fprintf(stderr, "bela_setTrill format is wrong. Should be:\n"
		"[mode <sensor_id> <prescaler_value>(\n"
		" or\n"
		"[threshold <sensor_id> <threshold_value>(\n"
		" or\n"
		"[prescaler <sensor_id> <prescaler_value>(\n");
}
#endif // BELA_LIBPD_TRILL

void Bela_listHook(const char *source, int argc, t_atom *argv)
{
#ifdef BELA_LIBPD_GUI
	if(0 == strcmp(source, "bela_guiOut"))
	{
		if(!libpd_is_float(&argv[0]))
		{
			rt_fprintf(stderr, "Wrong format for bela_gui, the first element should be a float\n");
			return;
		}
		unsigned int bufNum = libpd_get_float(&argv[0]);
		if(libpd_is_float(&argv[1])) // if the first element is a float, we send an array of floats
		{
			float buf[argc - 1];
			for(int n = 1; n < argc; ++n)
			{
				t_atom *a = &argv[n];
				if(!libpd_is_float(a))
				{
					rt_fprintf(stderr, "Wrong format for bela_gui\n"); // this should never happen, because then the selector would've not been "float"
					return;
				}
				buf[n - 1] = libpd_get_float(a);
			}
			gui.sendBuffer(bufNum, buf, argc - 1);
			return;
		} else { // otherwise we send each element of the list separately
			for(int n = 1; n < argc; ++n)
			{
				t_atom *a = &argv[n];
				if (libpd_is_float(a)) {
					float x = libpd_get_float(a);
					gui.sendBuffer(bufNum, x);
				} else if (libpd_is_symbol(a)) {
					const char *s = libpd_get_symbol(a);
					gui.sendBuffer(bufNum, s, strlen(s)); // TODO: should it be strlen(s)+1?
				}
			}
		}
		return;
	}
#endif // BELA_LIBPD_GUI
}
void Bela_messageHook(const char *source, const char *symbol, int argc, t_atom *argv){
#ifdef BELA_LIBPD_MIDI
	if(strcmp(source, "bela_setMidi") == 0)
	{
		if(0 == strcmp("verbose", symbol))
		{
			if(1 != argc || !libpd_is_float(argv))
			{
				rt_fprintf(stderr, "Wrong format for bela_setMidi, expected: [verbose <n>(\n");
			} else {
				gMidiVerbose = libpd_get_float(argv);
				rt_printf("MIDI verbose: %d\n", gMidiVerbose);
			}
			return;
		}
		int num[3] = {0, 0, 0};
		for(int n = 0; n < argc && n < 3; ++n)
		{
			if(!libpd_is_float(&argv[n]))
			{
				fprintf(stderr, "Wrong format for bela_setMidi, expected:[hw 1 0 0(");
				return;
			}
			num[n] = libpd_get_float(&argv[n]);
		}
		std::ostringstream deviceName;
		deviceName << symbol << ":" << num[0] << "," << num[1] << "," << num[2];
		printf("Adding Midi device: %s\n", deviceName.str().c_str());
		Midi* newMidi = openMidiDevice(deviceName.str(), false, true);
		if(newMidi)
		{
			midi.push_back(newMidi);
			gMidiPortNames.push_back(deviceName.str());
		}
		dumpMidi();
		return;
	}
#endif // BELA_LIBPD_MIDI
	if(strcmp(source, "bela_setDigital") == 0){
		// symbol is the direction, argv[0] is the channel, argv[1] (optional)
		// is signal("sig" or "~") or message("message", default) rate
		bool isMessageRate = true; // defaults to message rate
		bool direction = 0; // initialize it just to avoid the compiler's warning
		bool disable = false;
		if(strcmp(symbol, "in") == 0){
			direction = INPUT;
		} else if(strcmp(symbol, "out") == 0){
			direction = OUTPUT;
		} else if(strcmp(symbol, "disable") == 0){
			disable = true;
		} else {
			return;
		}
		if(argc == 0){
			return;
		} else if (libpd_is_float(&argv[0]) == false){
			return;
		}
		int channel = libpd_get_float(&argv[0]) - gLibpdDigitalChannelOffset;
		if(disable == true){
			dcm.unmanage(channel);
			return;
		}
		if(argc >= 2){
			t_atom* a = &argv[1];
			if(libpd_is_symbol(a)){
				const char *s = libpd_get_symbol(a);
				if(strcmp(s, "~") == 0  || strncmp(s, "sig", 3) == 0){
					isMessageRate = false;
				}
			}
		}
		dcm.manage(channel, direction, isMessageRate);
		return;
	}
	if(strcmp(source, "bela_control") == 0){
		if(strcmp("stop", symbol) == 0){
			rt_printf("bela_control: stop\n");
			Bela_requestStop();
		}
		return;
	}
#ifdef BELA_LIBPD_GUI
	if(0 == strcmp(source, "bela_setGui"))
	{
		if(0 == strcmp(symbol, "new"))
		{
			if(
				argc < 2
				|| !libpd_is_symbol(argv)
				|| !libpd_is_symbol(argv + 1)
			)
			{
				return;
			}
			const char* mode = libpd_get_symbol(argv);
			const char* name = libpd_get_symbol(argv + 1);
			if(0 == strcmp(mode, "control"))
			{
				gGuiControlBuffers.emplace_back(name);
				return;
			}
			if(0 == strcmp(mode, "array"))
			{
				// because of
				// https://github.com/libpd/libpd/issues/274
				// (again), we cannot access the arrays right
				// here (as it would deadlock on loadbang), so
				// we have to defer creation of the Gui
				// buffers until render() runs
				gGuiDataBuffers.emplace_back(bufferDescription{.name = name, .id = -1, .size = 0});
				return;
			}
			return;
		}
	}
#endif // BELA_LIBPD_GUI
#ifdef BELA_LIBPD_SERIAL
	if(0 == strcmp(source, "bela_setSerial"))
	{
		if(0 == strcmp(symbol, "new"))
		{
			if(
				argc < 5
				|| !libpd_is_symbol(argv + 0)
				|| !libpd_is_symbol(argv + 1)
				|| !libpd_is_float(argv + 2)
				|| !libpd_is_symbol(argv + 3)
				|| !libpd_is_symbol(argv + 4)
			)
			{
				fprintf(stderr, "Invalid bela_setSerial arguments. Should be: `new serial_id device baudrate EOM type`, where `EOM` is one of `newline` or `none` and `type` is one of `floats`, `symbol`, `symbols`\n");
				return;
			}
			gSerialId = libpd_get_symbol(argv + 0);
			const char* device = libpd_get_symbol(argv + 1);
			unsigned int baudrate = libpd_get_float(argv + 2);
			const char* eom = libpd_get_symbol(argv + 3);
			if(0 == strcmp(eom, "newline"))
				gSerialEom = '\n';
			else
				gSerialEom = -1;
			const char* type = libpd_get_symbol(argv + 4);
			if(0 == strcmp("floats", type))
				gSerialType = kSerialFloats;
			else if(0 == strcmp("symbol", type))
				gSerialType = kSerialSymbol;
			else if(0 == strcmp("symbols", type))
				gSerialType = kSerialSymbols;

			if(gSerial.setup(device, baudrate))
				return;
			gSerialInputTask = Bela_runAuxiliaryTask(serialInputLoop, 0);
			gSerialOutputTask = Bela_runAuxiliaryTask(serialOutputLoop, 0);
		}
	}
#endif // BELA_LIBPD_SERIAL
#ifdef BELA_LIBPD_TRILL
	if(0 == strcmp(source, "bela_setTrill"))
	{
		if(0 == strcmp(symbol, "new"))
		{
			bool err = false;

			uint8_t address = 0xff;
			if(argc < 3)
				err = true;
			else if (!libpd_is_symbol(argv) // sensor_id
				|| !libpd_is_float(argv + 1) // bus
				|| !libpd_is_symbol(argv + 2) // device
			)
				err = true;
			if(argc >= 4)
			{
				if(libpd_is_float(argv + 3))
					address = libpd_get_float(argv + 3);
				else
					err = true;
			}
			if(err)
			{
				rt_fprintf(stderr, "bela_setTrill wrong format. Should be:\n"
					"[new <sensor_id> <bus> <device> <address>(\n");
				return;
			}
			const char* name = libpd_get_symbol(argv);
			unsigned int bus = libpd_get_float(argv + 1);
			const char* deviceString = libpd_get_symbol(argv + 2);
			Trill::Device device = Trill::getDeviceFromName(deviceString);

			Trill* trill = new Trill(bus, device, address);
			if(Trill::NONE == trill->deviceType())
			{
				rt_fprintf(stderr, "Unable to create Trill %s device `%s` on bus %u at ", deviceString, name, bus);
				if(128 < address)
					rt_fprintf(stderr, "default address. ");
				else
					rt_fprintf(stderr, "address: %#x (%d). ", address, address);
				rt_fprintf(stderr, "Is the device connected?\n");
				return;
			}
			gTouchSensors.emplace_back(std::string(name), trill);
			gTrillAcks.push_back(name);
			//an ack is sent to Pd during the next audio callback because of https://github.com/libpd/libpd/issues/274
			return;
		}
		if(argc < 1 || !libpd_is_symbol(argv))
		{
			rt_fprintf(stderr, "bela_setTrill: wrong format. It should be\n"
					"[<command> <sensor_id> ...(");
			return;
		}
		const char* sensorId = libpd_get_symbol(argv);
		int idx = getIdxFromId(sensorId, gTouchSensors);
		if(idx < 0)
		{
			rt_fprintf(stderr, "bela_setTrill sensor_id unknown: %s\n", sensorId);
			return;
		}
		if(0 == strcmp(symbol, "updateBaseline"))
		{
			gTouchSensors[idx].second->updateBaseline();
			return;
		}
		if(0 == strcmp(symbol, "mode"))
		{
			if(argc < 2
				|| !libpd_is_symbol(argv)
				|| !libpd_is_symbol(argv + 1)
			) {
				setTrillPrintError();
				return;
			}
			const char* modeString = libpd_get_symbol(argv + 1);
			Trill::Mode mode = Trill::getModeFromName(modeString);
			gTouchSensors[idx].second->setMode(mode);
		}
		if(
			0 == strcmp(symbol, "threshold")
			|| 0 == strcmp(symbol, "prescaler")
		)
		{
			if(
				argc < 2
				|| !libpd_is_symbol(argv)
				|| !libpd_is_float(argv + 1)
			  ) {
				setTrillPrintError();
				return;
			}
			float value = libpd_get_float(argv + 1);
			if(0 == strcmp(symbol, "threshold"))
			{
				gTouchSensors[idx].second->setNoiseThreshold(value);
			}
			if(0 == strcmp(symbol, "prescaler"))
			{
				if(Trill::prescalerMax < value || 0 > value)
				{
					if(0 == value)
						value = 0;
					if(Trill::prescalerMax < value)
						value = Trill::prescalerMax;
					rt_printf("bela_setTrill prescaler value out of range, clipping to %u\n", value);
				}
				gTouchSensors[idx].second->setPrescaler(value);
			}
			return;
		}
		return;
	}
#endif // BELA_LIBPD_TRILL
}

void Bela_floatHook(const char *source, float value){
	// let's make this as optimized as possible for built-in digital Out parsing
	// the built-in digital receivers are of the form "bela_digitalOutXX" where XX is between gLibpdDigitalChannelOffset and (gLibpdDigitalCHannelOffset+gDigitalChannelsInUse)
	static int prefixLength = strlen("bela_digitalOut");
	if(strncmp(source, "bela_digitalOut", prefixLength)==0){
		if(source[prefixLength] != 0){ //the two ifs are used instead of if(strlen(source) >= prefixLength+2)
			if(source[prefixLength + 1] != 0){
				// quickly convert the suffix to integer, assuming they are numbers, avoiding to call atoi
				int receiver = ((source[prefixLength] - 48) * 10);
				receiver += (source[prefixLength+1] - 48);
				unsigned int channel = receiver - gLibpdDigitalChannelOffset; // go back to the actual Bela digital channel number
				if(channel < gDigitalChannelsInUse){ //number of digital channels
					dcm.setValue(channel, value);
				}
			}
		}
		return;
	}
}



std::vector<std::string> gReceiverInputNames;
std::vector<std::string> gReceiverOutputNames;
void generateDigitalNames(unsigned int numDigitals, unsigned int libpdOffset, std::vector<std::string>& receiverInputNames, std::vector<std::string>& receiverOutputNames)
{
	std::string inBaseString = "bela_digitalIn";
	std::string outBaseString = "bela_digitalOut";
	for(unsigned int i = 0; i<numDigitals; i++)
	{
		receiverInputNames.push_back(inBaseString + std::to_string(i+libpdOffset));
		receiverOutputNames.push_back(outBaseString + std::to_string(i+libpdOffset));
	}
}

void printDigitalNames(std::vector<std::string>& receiverInputNames, std::vector<std::string>& receiverOutputNames)
{
	printf("DIGITAL INPUTS\n");
	for(unsigned int i=0; i<gDigitalChannelsInUse; i++)
		printf("%s\n", receiverInputNames[i].c_str());
	printf("DIGITAL OUTPUTS\n");
	for(unsigned int i=0; i<gDigitalChannelsInUse; i++)
		printf("%s\n", receiverOutputNames[i].c_str());
}

static char multiplexerArray[] = {"bela_multiplexer"};
static int multiplexerArraySize = 0;
static bool pdMultiplexerActive = false;

#ifdef PD_THREADED_IO
void fdLoop(void* arg){
	while(!Bela_stopRequested()){
		if(!sys_doio(pd_this))
			usleep(3000);
	}
}
#endif /* PD_THREADED_IO */

#ifdef BELA_LIBPD_SCOPE
Scope scope;
float* gScopeOut;
#endif // BELA_LIBPD_SCOPE
void* gPatch;
bool gDigitalEnabled = 0;

bool setup(BelaContext *context, void *userData)
{
   
#ifdef BELA_LIBPD_GUI
	gui.setup(context->projectName);
	gui.setControlDataCallback(guiControlDataCallback, nullptr);
	gGuiPipe.setup("guiControlPipe", 16384);
#endif // BELA_LIBPD_GUI
#ifdef BELA_LIBPD_SERIAL
	gSerialPipe.setup("serialPipe", 16384);
#endif // BELA_LIBPD_SERIAL
	// Check Pd's version
	int major, minor, bugfix;
	sys_getversion(&major, &minor, &bugfix);
	printf("Running Pd %d.%d-%d\n", major, minor, bugfix);
	// We requested in Bela_userSettings() to have uniform sampling rate for audio
	// and analog and non-interleaved buffers.
	// So let's check this actually happened
	if(context->analogSampleRate != context->audioSampleRate)
	{
		fprintf(stderr, "The sample rate of analog and audio must match. Try running with --uniform-sample-rate\n");
		return false;
	}
	if(context->flags & BELA_FLAG_INTERLEAVED)
	{
		fprintf(stderr, "The audio and analog channels must be interleaved.\n");
		return false;
	}

	if(context->digitalFrames > 0 && context->digitalChannels > 0)
		gDigitalEnabled = 1;

#ifdef BELA_LIBPD_MIDI
	// add here other devices you need 
	gMidiPortNames.push_back("hw:1,0,0");
	//gMidiPortNames.push_back("hw:0,0,0");
	//gMidiPortNames.push_back("hw:1,0,1");
#endif // BELA_LIBPD_MIDI
#ifdef BELA_LIBPD_SCOPE
	scope.setup(gScopeChannelsInUse, context->audioSampleRate);
	gScopeOut = new float[gScopeChannelsInUse];
#endif // BELA_LIBPD_SCOPE

	// Check first of all if the patch file exists. Will actually open it later.
	char file[] = "_main.pd";
	char folder[] = "./";
	unsigned int strSize = strlen(file) + strlen(folder) + 1;
	char* str = (char*)malloc(sizeof(char) * strSize);
	snprintf(str, strSize, "%s%s", folder, file);
	if(access(str, F_OK) == -1 ) {
		printf("Error file %s/%s not found. The %s file should be your main patch.\n", folder, file, file);
		return false;
	}
	free(str);

	// analog setup
	gAnalogChannelsInUse = context->analogInChannels;
	gDigitalChannelsInUse = context->digitalChannels;
	printf("Audio channels in use: %d\n", context->audioOutChannels);
	printf("Analog channels in use: %d\n", gAnalogChannelsInUse);
	printf("Digital channels in use: %d\n", gDigitalChannelsInUse);

	// Channel distribution
	gFirstAnalogInChannel = std::max(context->audioInChannels, context->audioOutChannels);
	gFirstAnalogOutChannel = gFirstAnalogInChannel;
	gFirstDigitalChannel = gFirstAnalogInChannel + std::max(context->analogInChannels, context->analogOutChannels);
	if(gFirstDigitalChannel < minFirstDigitalChannel)
		gFirstDigitalChannel = minFirstDigitalChannel; //for backwards compatibility
	gLibpdDigitalChannelOffset = gFirstDigitalChannel + 1;
	gFirstScopeChannel = gFirstDigitalChannel + gDigitalChannelsInUse;

	gChannelsInUse = gFirstScopeChannel + gScopeChannelsInUse;
	
	// Create receiverNames for digital channels
	generateDigitalNames(gDigitalChannelsInUse, gLibpdDigitalChannelOffset, gReceiverInputNames, gReceiverOutputNames);
	
	// digital setup
	if(gDigitalEnabled)
	{
		dcm.setCallback(sendDigitalMessage);
		if(gDigitalChannelsInUse > 0){
			for(unsigned int ch = 0; ch < gDigitalChannelsInUse; ++ch){
				dcm.setCallbackArgument(ch, (void*) gReceiverInputNames[ch].c_str());
			}
		}
	}

#ifdef BELA_LIBPD_MIDI
	unsigned int n = 0;
	while(n < gMidiPortNames.size())
	{
		Midi* newMidi = openMidiDevice(gMidiPortNames[n], false, false);
		if(newMidi)
		{
			midi.push_back(newMidi);
			++n;
		} else {
			gMidiPortNames.erase(gMidiPortNames.begin() + n);
		}
	}
	dumpMidi();
#endif // BELA_LIBPD_MIDI

	// check that we are not running with a blocksize smaller than gLibPdBlockSize
	gLibpdBlockSize = libpd_blocksize();
	if(context->audioFrames < gLibpdBlockSize){
		fprintf(stderr, "Error: minimum block size must be %d\n", gLibpdBlockSize);
		return false;
	}

	// set hooks before calling libpd_init
	libpd_set_printhook(Bela_printHook);
	libpd_set_floathook(Bela_floatHook);
	libpd_set_listhook(Bela_listHook);
	libpd_set_messagehook(Bela_messageHook);
#ifdef BELA_LIBPD_MIDI
	libpd_set_noteonhook(Bela_MidiOutNoteOn);
	libpd_set_controlchangehook(Bela_MidiOutControlChange);
	libpd_set_programchangehook(Bela_MidiOutProgramChange);
	libpd_set_pitchbendhook(Bela_MidiOutPitchBend);
	libpd_set_aftertouchhook(Bela_MidiOutAftertouch);
	libpd_set_polyaftertouchhook(Bela_MidiOutPolyAftertouch);
	libpd_set_midibytehook(Bela_MidiOutByte);
#endif // BELA_LIBPD_MIDI

	//initialize libpd. This clears the search path
	libpd_init();
	//Add the current folder to the search path for externals
	libpd_add_to_search_path(".");
	libpd_add_to_search_path("../pd-externals");

	libpd_init_audio(gChannelsInUse, gChannelsInUse, context->audioSampleRate);
	gInBuf = get_sys_soundin();
	gOutBuf = get_sys_soundout();

	// start DSP:
	// [; pd dsp 1(
	libpd_start_message(1);
	libpd_add_float(1.0f);
	libpd_finish_message("pd", "dsp");

	// Bind your receivers here
	for(unsigned int i = 0; i < gDigitalChannelsInUse; i++)
		libpd_bind(gReceiverOutputNames[i].c_str());
	libpd_bind("bela_setDigital");
	libpd_bind("bela_control");
#ifdef BELA_LIBPD_MIDI
	libpd_bind("bela_setMidi");
#endif // BELA_LIBPD_MIDI
#ifdef BELA_LIBPD_GUI
	libpd_bind("bela_guiOut");
	libpd_bind("bela_setGui");
#endif // BELA_LIBPD_GUI
#ifdef BELA_LIBPD_SERIAL
	libpd_bind("bela_serialOut");
	libpd_bind("bela_setSerial");
#endif // BELA_LIBPD_SERIAL
#ifdef BELA_LIBPD_TRILL
	libpd_bind("bela_setTrill");
#endif // BELA_LIBPD_TRILL

	// open patch:
	gPatch = libpd_openfile(file, folder);
	if(gPatch == NULL){
		printf("Error: file %s/%s is corrupted.\n", folder, file); 
		return false;
	}

	// If the user wants to use the multiplexer capelet,
	// the patch will have to contain an array called "bela_multiplexer"
	// and a receiver [r bela_multiplexerChannels]
	if(context->multiplexerChannels > 0 && libpd_arraysize(multiplexerArray) >= 0){
		pdMultiplexerActive = true;
		multiplexerArraySize = context->multiplexerChannels * context->analogInChannels;
		// [; bela_multiplexer ` multiplexerArraySize` resize(
		libpd_start_message(1);
		libpd_add_float(multiplexerArraySize);
		libpd_finish_message(multiplexerArray, "resize");
		// [; bela_multiplexerChannels `context->multiplexerChannels`(
		libpd_float("bela_multiplexerChannels", context->multiplexerChannels);
	}

	// Tell Pd that we will manage the io loop,
	// and we do so in an Auxiliary Task
#ifdef PD_THREADED_IO
	sys_dontmanageio(1);
	AuxiliaryTask fdTask;
	fdTask = Bela_createAuxiliaryTask(fdLoop, 50, "libpd-fdTask", NULL);
	Bela_scheduleAuxiliaryTask(fdTask);
#endif /* PD_THREADED_IO */

	dcm.setVerbose(false);
#ifdef BELA_LIBPD_TRILL
	gTrillTask = Bela_createAuxiliaryTask(readTouchSensors, 51, "touchSensorRead", NULL);
	gTrillPipe.setup("trillPipe", 1024);
#endif // BELA_LIBPD_TRILL
	return true;
	
		//MODIFIED
	
	if(!mpr121.begin(1, 0x5A)) {
                rt_printf("Error initialising MPR121\n");
                return false;
        }
        i2cTask = Bela_createAuxiliaryTask(readMPR121, 50, "bela-mpr121");
        readIntervalSamples = context->audioSampleRate / readInterval;
        
        //return true;
        
        // END MODIFIED
	
}

void render(BelaContext *context, void *userData)
{
#ifdef BELA_LIBPD_GUI
	while(gGuiControlBuffers.size()) // this won't change within the loop, but it's good not to have to use a separate flag
	{
		static struct guiControlMessageHeader header;
		static bool waitingForHeader = true;
		if(waitingForHeader)
		{
			int ret = gGuiPipe.readRt(header);
			if(1 != ret)
				break;
			else
				waitingForHeader = false;
		}
		if(!waitingForHeader)
		{
			char payload[header.size + ('s' == header.type)]; // + 1 to add null termination if needed
			int ret = gGuiPipe.readRt(&payload[0], header.size);
			if(int(header.size) != ret)
			{
				break;
			}
			const char* name = gGuiControlBuffers[header.id].c_str();
			if('f' == header.type)
			{
				if(header.size != sizeof(float))
				{
					rt_fprintf(stderr, "Unexpected message length for float: %u\n", header.size);
					continue;
				}
				float value;
				memcpy(&value, payload, sizeof(value));
				libpd_start_message(1);
				libpd_add_float(value);
				libpd_finish_message("bela_guiControl", name);
			}
			if('s' == header.type)
			{
				// add null termination
				payload[header.size] = '\0';
				// send to Pd
				libpd_start_message(1);
				libpd_add_symbol(payload);
				libpd_finish_message("bela_guiControl", name);
			}
			waitingForHeader = true;
		}
	}
	for(auto& b : gGuiDataBuffers)
	{
		int id = b.id;
		int size = b.size;
		const char* name = b.name.c_str();
		if(id < 0)
		{
			// initialize
			size = libpd_arraysize(name);
			if(size <= 0)
			{
				continue;
			} else {
				// this is thread-unsafe: what happens if this causes reallocation while the Gui thread is writing to a buffer?
				id = gui.setBuffer('f', size);
				b.id = id;
				b.size = size;
				DataBuffer& dataBuffer = gui.getDataBuffer(id);
				// initialize gui buffer with the initial content of the array
				libpd_read_array(dataBuffer.getAsFloat(), b.name.c_str(), 0, size);
			}
		}
		DataBuffer& dataBuffer = gui.getDataBuffer(b.id);
		libpd_write_array(b.name.c_str(), 0, dataBuffer.getAsFloat(), dataBuffer.getNumElements());
	}
#endif // BELA_LIBPD_GUI
#ifdef BELA_LIBPD_SERIAL
	while(gSerialInputTask) // proxy for 'isEnabled. Using `while` so we can do early return
	{
		enum WaitingFor_t {
			kHeader,
			kId,
			kData,
		};
		static struct serialMessageHeader h;
		static enum WaitingFor_t waitingFor = kHeader;
		static char id[100];
		if(kHeader == waitingFor)
		{
			int ret = gSerialPipe.readRt(h);
			if(ret <= 0)
				break;
			waitingFor = kId;
		}
		if(kId == waitingFor)
		{
			if(h.idSize > sizeof(id) - 1)
				rt_fprintf(stderr, "Serial: ID too large\n");
			else
			{
				int ret = gSerialPipe.readRt(id, h.idSize);
				if(ret <= 0)
					break;
				if(int(h.idSize) != ret)
				{
					rt_fprintf(stderr, "Invalid number of bytes read from gSerialPipe. Expected: %u, got %u\n", h.idSize, ret);
					break;
				}
				id[ret] = '\0'; // ensure it's null-terminated
				waitingFor = kData;
			}
		}
		if(kData == waitingFor)
		{
			char data[h.dataSize + 1];
			int ret = gSerialPipe.readRt(data, h.dataSize);
			if(ret <= 0)
				break;
			if(int(h.dataSize) != ret)
			{
				rt_fprintf(stderr, "Invalid number of bytes read from gSerialPipe. Expected: %u, got %u\n", h.dataSize, ret);
				break;
			}
			data[h.dataSize] = '\0'; // ensure it's null-terminated
			if(h.dataSize)
			{
				const char* rec = "bela_serial";
				if(kSerialSymbol == gSerialType)
				{
					libpd_symbol(rec, data);
				} else {
					unsigned int nTokens = 1;
					const uint8_t separators[] = { ' ', '\0'};
					// find number of delimiters
					size_t start = 0;
					for(size_t n = 0; n < sizeof(data); ++n)
					{
						for(size_t c = 0; c < sizeof(separators); ++c)
						{
							if(separators[c] == data[n] && n != start) // exclude empty tokens
							{
								start = n + 1;
								nTokens++;
							}
						}
					}
					libpd_start_message(nTokens);
					start = 0;
					for(size_t n = 0; n < sizeof(data); ++n)
					{
						bool end = false;
						for(size_t c = 0; c < sizeof(separators); ++c)
						{
							if(separators[c] == data[n])
							{
								if(start == n)
									start++; // remove empty tokens
								else
									end = true;
								break; // no need to check for more separators
							}
						}
						if(end)
						{
							data[n] = '\0'; // ensure the string is null-terminated so the next line works
							if(kSerialSymbols == gSerialType)
								libpd_add_symbol(data + start);
							else if (kSerialFloats == gSerialType)
								libpd_add_float(atof(data + start));
							start = n + 1;
						}
					}
					libpd_finish_message("bela_serial", id);
				}
			}
			waitingFor = kHeader;
		}
	}
#endif // BELA_LIBPD_SERIAL
#ifdef BELA_LIBPD_TRILL
	for(auto& name : gTrillAcks)
	{
		unsigned int idx = getIdxFromId(name.c_str(), gTouchSensors);
		libpd_start_message(3);
		libpd_add_symbol(Trill::getNameFromDevice(gTouchSensors[idx].second->deviceType()).c_str());
		libpd_add_float(gTouchSensors[idx].second->getAddress());
		libpd_add_symbol(Trill::getNameFromMode(gTouchSensors[idx].second->getMode()).c_str());
		libpd_finish_message("bela_trillCreated", name.c_str());
	}
	gTrillAcks.resize(0);
	bool doTrill = false;
	for(auto& t : gTouchSensors)
	{
		if(Trill::NONE != t.second->deviceType())
		{
			doTrill = true;
			break;
		}
	}
	if(doTrill)
	{
		int idx;
		while(gTrillPipe.readRt(idx) > 0)
		{
			Trill& touchSensor = *gTouchSensors[idx].second;
			const char* sensorId = gTouchSensors[idx].first.c_str();
			if(Trill::Device::NONE == touchSensor.deviceType())
				continue;

			const Trill::Mode mode = touchSensor.getMode();
			if(Trill::DIFF == mode || Trill::RAW == mode || Trill::BASELINE == mode)
			{
				libpd_start_message(touchSensor.getNumChannels());
				for(unsigned int n = 0; n < touchSensor.getNumChannels(); ++n)
				{
					libpd_add_float(touchSensor.rawData[n]);
				}
			} else if(Trill::CENTROID == mode)
			{
				if(touchSensor.is1D()) {
					libpd_start_message(2 * touchSensor.getNumTouches() + 1);
					libpd_add_float(touchSensor.getNumTouches());
					for(unsigned int i = 0; i < touchSensor.getNumTouches(); i++) {
						libpd_add_float(touchSensor.touchLocation(i));
						libpd_add_float(touchSensor.touchSize(i));
					}
				} else if (touchSensor.is2D()) {
					int numTouches = touchSensor.compoundTouchSize() > 0;
					libpd_start_message(2 * numTouches + 1);
					libpd_add_float(numTouches > 0);
					if(numTouches)
					{
						libpd_add_float(touchSensor.compoundTouchHorizontalLocation());
						libpd_add_float(touchSensor.compoundTouchLocation());
						libpd_add_float(touchSensor.compoundTouchSize());
					}
				}
			}
			else
				continue;
			libpd_finish_message("bela_trill", sensorId);
		}

		static unsigned int count = 0;
		unsigned int readIntervalSamples = touchSensorSleepInterval * context->audioSampleRate;
		count += context->audioFrames;
		if(count > readIntervalSamples)
		{
			Bela_scheduleAuxiliaryTask(gTrillTask);
			count -= readIntervalSamples;
		}
	}
#endif // BELA_LIBPD_TRILL
#ifdef BELA_LIBPD_MIDI
#ifdef PARSE_MIDI
	int num;
	for(unsigned int port = 0; port < midi.size(); ++port){
		while((num = midi[port]->getParser()->numAvailableMessages()) > 0){
			static MidiChannelMessage message;
			message = midi[port]->getParser()->getNextChannelMessage();
			if(gMidiVerbose >= kMidiVerbosePrintLevel)
			{
				rt_printf("On port %d (%s): ", port, gMidiPortNames[port].c_str());
				message.prettyPrint(); // use this to print beautified message (channel, data bytes)
			}
			switch(message.getType()){
				case kmmNoteOn:
				{
					int noteNumber = message.getDataByte(0);
					int velocity = message.getDataByte(1);
					int channel = message.getChannel();
					libpd_noteon(channel + port * 16, noteNumber, velocity);
					break;
				}
				case kmmNoteOff:
				{
					/* PureData does not seem to handle noteoff messages as per the MIDI specs,
					 * so that the noteoff velocity is ignored. Here we convert them to noteon
					 * with a velocity of 0.
					 */
					int noteNumber = message.getDataByte(0);
	//				int velocity = message.getDataByte(1); // would be ignored by Pd
					int channel = message.getChannel();
					libpd_noteon(channel + port * 16, noteNumber, 0);
					break;
				}
				case kmmControlChange:
				{
					int channel = message.getChannel();
					int controller = message.getDataByte(0);
					int value = message.getDataByte(1);
					libpd_controlchange(channel + port * 16, controller, value);
					break;
				}
				case kmmProgramChange:
				{
					int channel = message.getChannel();
					int program = message.getDataByte(0);
					libpd_programchange(channel + port * 16, program);
					break;
				}
				case kmmPolyphonicKeyPressure:
				{
					int channel = message.getChannel();
					int pitch = message.getDataByte(0);
					int value = message.getDataByte(1);
					libpd_polyaftertouch(channel + port * 16, pitch, value);
					break;
				}
				case kmmChannelPressure:
				{
					int channel = message.getChannel();
					int value = message.getDataByte(0);
					libpd_aftertouch(channel + port * 16, value);
					break;
				}
				case kmmPitchBend:
				{
					int channel = message.getChannel();
					int value =  ((message.getDataByte(1) << 7)| message.getDataByte(0)) - 8192;
					libpd_pitchbend(channel + port * 16, value);
					break;
				}
				case kmmSystem:
				// currently Bela only handles sysrealtime, and it does so pretending it is a channel message with no data bytes, so we have to re-assemble the status byte
				{
					int channel = message.getChannel();
					int status = message.getStatusByte();
					int byte = channel | status;
					libpd_sysrealtime(port, byte);
					break;
				}
				case kmmNone:
				case kmmAny:
					break;
			}
		}
	}
#else
	int input;
	for(unsigned int port = 0; port < NUM_MIDI_PORTS; ++port){
		while((input = midi[port].getInput()) >= 0){
			libpd_midibyte(port, input);
		}
	}
#endif /* PARSE_MIDI */
#endif // BELA_LIBPD_MIDI
	unsigned int numberOfPdBlocksToProcess = context->audioFrames / gLibpdBlockSize;

	// Remember: we have non-interleaved buffers and the same sampling rate for
	// analogs, audio and digitals
	for(unsigned int tick = 0; tick < numberOfPdBlocksToProcess; ++tick)
	{
		//audio input
		for(unsigned int n = 0; n < context->audioInChannels; ++n)
		{
			memcpy(
				gInBuf + n * gLibpdBlockSize,
				context->audioIn + tick * gLibpdBlockSize + n * context->audioFrames, 
				sizeof(context->audioIn[0]) * gLibpdBlockSize
			);
		}

		// analog input
		for(unsigned int n = 0; n < context->analogInChannels; ++n)
		{
			memcpy(
				gInBuf + gLibpdBlockSize * gFirstAnalogInChannel + n * gLibpdBlockSize,
				context->analogIn + tick * gLibpdBlockSize + n * context->analogFrames, 
				sizeof(context->analogIn[0]) * gLibpdBlockSize
			);
		}
		// multiplexed analog input
		if(pdMultiplexerActive)
		{
			// we do not disable regular analog inputs if muxer is active, because user may have bridged them on the board and
			// they may be using half of them at a high sampling-rate
			static int lastMuxerUpdate = 0;
			if(++lastMuxerUpdate == multiplexerArraySize){
				lastMuxerUpdate = 0;
				libpd_write_array(multiplexerArray, 0, (float *const)context->multiplexerAnalogIn, multiplexerArraySize);
			}
		}

		unsigned int digitalFrameBase = gLibpdBlockSize * tick;
		unsigned int j;
		unsigned int k;
		float* p0;
		float* p1;
		// digital input
		if(gDigitalEnabled)
		{
			// digital in at message-rate
			dcm.processInput(&context->digital[digitalFrameBase], gLibpdBlockSize);

			// digital in at signal-rate
			for (j = 0, p0 = gInBuf; j < gLibpdBlockSize; j++, p0++) {
				unsigned int digitalFrame = digitalFrameBase + j;
				for (k = 0, p1 = p0 + gLibpdBlockSize * gFirstDigitalChannel;
						k < 16; ++k, p1 += gLibpdBlockSize) {
					if(dcm.isSignalRate(k) && dcm.isInput(k)){ // only process input channels that are handled at signal rate
						*p1 = digitalRead(context, digitalFrame, k);
					}
				}
			}
		}

		libpd_process_sys(); // process the block

		// digital outputs
		if(gDigitalEnabled)
		{
			// digital out at signal-rate
			for (j = 0, p0 = gOutBuf; j < gLibpdBlockSize; ++j, ++p0) {
				unsigned int digitalFrame = (digitalFrameBase + j);
				for (k = 0, p1 = p0  + gLibpdBlockSize * gFirstDigitalChannel;
					k < context->digitalChannels; k++, p1 += gLibpdBlockSize)
				{
					if(dcm.isSignalRate(k) && dcm.isOutput(k)){ // only process output channels that are handled at signal rate
						digitalWriteOnce(context, digitalFrame, k, *p1 > 0.5);
					}
				}
			}

			// digital out at message-rate
			dcm.processOutput(&context->digital[digitalFrameBase], gLibpdBlockSize);
		}

#ifdef BELA_LIBPD_SCOPE
		// scope output
		for (j = 0, p0 = gOutBuf; j < gLibpdBlockSize; ++j, ++p0) {
			for (k = 0, p1 = p0 + gLibpdBlockSize * gFirstScopeChannel; k < gScopeChannelsInUse; k++, p1 += gLibpdBlockSize) {
				gScopeOut[k] = *p1;
			}
			scope.log(gScopeOut[0], gScopeOut[1], gScopeOut[2], gScopeOut[3]);
		}
#endif // BELA_LIBPD_SCOPE

		// audio output
		for(unsigned int n = 0; n < context->audioOutChannels; ++n)
		{
			memcpy(
				context->audioOut + tick * gLibpdBlockSize + n * context->audioFrames, 
				gOutBuf + n * gLibpdBlockSize,
				sizeof(context->audioOut[0]) * gLibpdBlockSize
			);
		}

		//analog output
		for(unsigned int n = 0; n < context->analogOutChannels; ++n)
		{
			memcpy(
				context->analogOut + tick * gLibpdBlockSize + n * context->analogFrames, 
				gOutBuf + gLibpdBlockSize * gFirstAnalogOutChannel + n * gLibpdBlockSize,
				sizeof(context->analogOut[0]) * gLibpdBlockSize
			);
		}
	}
	
	//MODIFIED
	for(unsigned int n = 0; n < context->audioFrames; n++) {
                // Keep this code: it schedules the touch sensor readings
                if(++readCount >= readIntervalSamples) {
                        readCount = 0;
                        Bela_scheduleAuxiliaryTask(i2cTask);
                }
            /*
                float sample = 0.0;
                for(unsigned int ch = 0; ch < context->audioInChannels; ch++)
                        context->audioOut[context->audioInChannels * n + ch] = sample; */
	}
	//END MODIFIED
}

void cleanup(BelaContext *context, void *userData)
{
#ifdef BELA_LIBPD_MIDI
	for(auto a : midi)
	{
		delete a;
	}
#endif // BELA_LIBPD_MIDI
#ifdef BELA_LIBPD_TRILL
	for(auto t : gTouchSensors)
	{
		// t.first is a std::string, so the memory will be deallocated automatically
		delete t.second;
	}
#endif // BELA_LIBPD_TRILL
	libpd_closefile(gPatch);
#ifdef BELA_LIBPD_SCOPE
	delete [] gScopeOut;
#endif // BELA_LIBPD_SCOPE
}

//MODIFIED
	
// Auxiliary task to read the I2C board
void readMPR121(void*)
{
        for(int i = 0; i < NUM_TOUCH_PINS; i++) {
                sensorValue[i] = -(mpr121.filteredData(i) - mpr121.baselineData(i));
                sensorValue[i] -= threshold;
                if(sensorValue[i] < 0)
                        sensorValue[i] = 0;
#ifdef DEBUG_MPR121
                rt_printf("%d ", sensorValue[i]);
#endif
        }
#ifdef DEBUG_MPR121
        rt_printf("\n");
#endif
        // You can use this to read binary on/off touch state more easily
        //rt_printf("Touched: %x\n", mpr121.touched());
        
        //SEND VALUES
        
     
        libpd_float("electr0", sensorValue[0]);
        libpd_float("electr1", sensorValue[1]);
        libpd_float("electr2", sensorValue[2]);
        libpd_float("electr3", sensorValue[3]);
        
}
	//END MODIFIED

giuliomoro

in setup() you have:

	return true;
	
		//MODIFIED
	
	if(!mpr121.begin(1, 0x5A)) {
                rt_printf("Error initialising MPR121\n");
                return false;
        }
        i2cTask = Bela_createAuxiliaryTask(readMPR121, 50, "bela-mpr121");
        readIntervalSamples = context->audioSampleRate / readInterval;
        
        //return true;
        
        // END MODIFIED

so anything in the // MODIFIED -> // END MODIFIED block is not actually being executed because it's after a return statement.

Remove the first return true and uncomment the last one

catwizard

Oh thank you so much!!!! I will see if that works.

catwizard

That fixed it! Thank you so much. You saved me additional hours of anguish.