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Après avoir trouvé le bon branchement, les 6 LEDs répondent !

Cependant, cela reste très anarchique : Je change les valeur d'un seul slider dans Max, mais plusieurs LEDs sont modulées tout au long de la course du slider. En Clair, le premier tiers module la LED 1, le deuxième la LED 2 etc..

J'ai regardé ce qui se passait dans Processing, et voilà ce que ça donne :

Code:

import themidibus.*;
import controlP5.*;
import oscP5.*;
import netP5.*;
import processing.serial.*;

ControlP5 controlP5;
Serial teensy;
OscP5 oscP5;

ListBox l, midiList;
Numberbox portBox;
MidiBus midi;

int channel; // first osc argument, corresponds to DAC output channel (0 - 7)
int inputData; // second osc argument, 10-bit number to output
int updateBits = 3; // dac update behavior register, update immediately when data received
int dacChip; // used to select one of the two chips
int spiWord; // the assembled 16-bit word is stored here before output over serial
String binaryString;
ArrayList <Byte> outputData = new ArrayList();
byte outputBytes[];
int dataIndex = 0;
int data[];
double previousUpdate = 0;
double currentTime;
String portName;
boolean serialConnected = false;
int newPort = 9999;
boolean portNeedsUpdate = false;

int channelData[]; // store current output value for each channel
boolean newData[];
Slider sliders[];
Slider sliderOne, sliderTwo, sliderThree, sliderFour, sliderFive, sliderSix, sliderSeven, sliderEight;

PFont font;

void setup() {
  size(710, 175);
  frameRate(16);
  midi = new MidiBus(this, 0, 0);
  controlP5 = new ControlP5(this);

  l = controlP5.addListBox("serialPorts", 550, 65, 140, 140);
  l.setItemHeight(15);
  l.setBarHeight(15);

  l.captionLabel().toUpperCase(true);
  l.captionLabel().set("serial ports");
  l.captionLabel().style().marginTop = 3;
  l.valueLabel().style().marginTop = 3; // the +/- sign
  for(int i=0; i < Serial.list().length; i++) {
   l.addItem(Serial.list()[i],i);
  }

  midiList = controlP5.addListBox("midiPorts", 15, 33, 140, 140);
  midiList.setItemHeight(15);
  midiList.setBarHeight(15);
  midiList.captionLabel().toUpperCase(true);
  midiList.captionLabel().set("MIDI inputs");
  midiList.captionLabel().style().marginTop = 3;
  midiList.valueLabel().style().marginTop = 3;
  for(int i=0; i < midi.availableInputs().length; i++) {
   midiList.addItem(midi.availableInputs()[i],i);
  }
  //l.setColorLabel(color(100, 200, 50));
  //l.close();

  portBox = controlP5.addNumberbox("port", 550, 15, 140, 15);
  portBox.setValue(9999);
  portBox.setId(1);
  portBox.setColorLabel(color(0, 0, 0));
  portBox.setDecimalPrecision(0);

  oscP5 = new OscP5(this, 9999); // start oscp5 listen on port 9999
  outputData = new ArrayList();
  outputBytes = new byte[1];
  channelData = new int[8];
  newData = new boolean[8];
  data = new int[8];
  font = loadFont("Monaco-9.vlw");
  textFont(font, 9);
  fill(100, 200, 50);
  stroke(100, 200, 50);
  sliders = new Slider[8];
  sliders[0] = new Slider(270, 40, 275);
  sliders[1] = new Slider(270, 55, 275);
  sliders[2] = new Slider(270, 70, 275);
  sliders[3] = new Slider(270, 85, 275);
  sliders[4] = new Slider(270, 100, 275);
  sliders[5] = new Slider(270, 115, 275);
  sliders[6] = new Slider(270, 130, 275);
  sliders[7] = new Slider(270, 145, 275);
}

void draw() {
  if(!mousePressed && portNeedsUpdate) {
   oscP5.dispose();
   oscP5 = new OscP5(this, newPort); // start oscp5 listen on port 9999
   portNeedsUpdate = false;
  }
  background(250, 250, 255);
  fill(0, 0, 0, 100);
  rect(10, 10, width - 20, height - 20);
  fill(250, 255, 255, 200);
  rect(160, 15, 385, 144);
  fill(0, 0, 0);
  stroke(0, 0, 0);
  text("SERIAL: "+ portName +" OSC: LISTENING ON PORT: "+ newPort +".", 165, 30);
  text("/CHANNEL 1: " + channelData[0], 165, 45);
  text("/CHANNEL 2: " + channelData[1], 165, 60);
  text("/CHANNEL 3: " + channelData[2], 165, 75);
  text("/CHANNEL 4: " + channelData[3], 165, 90);
  text("/CHANNEL 5: " + channelData[4], 165, 105);
  text("/CHANNEL 6: " + channelData[5], 165, 120);
  text("/CHANNEL 7: " + channelData[6], 165, 135);
  text("/CHANNEL 8: " + channelData[7], 165, 150);
  for(int i = 0; i < 8; i++) {
   sliders[i].update(channelData[i]);
  }
}

// need to update to select midi in port. MidiBus.list() will list them, this should be in a listbox
void controllerChange(int channel, int number, int value){
  if(number >= 20 && number <= 27){
   channelData[number - 20] = (int)map(value, 0, 127, 0, 1023);
   writeValue(number - 20, int(map(value, 0, 127, 0, 1023)));
  }
}

void oscEvent(OscMessage theOscMessage) {
  // println(theOscMessage);
  if(serialConnected) {
   if(theOscMessage.checkAddrPattern("/dac")==true) {
   for(int i = 0; i < 8; i++) {
   data[i] = (int)theOscMessage.get(i).intValue();
   if(data[i] != channelData[i]) {
   channelData[i] = data[i];
   newData[i] = true;
   }
   else {
   newData[i] = false;
   }
   }
   for(int i = 0; i < 8; i++) {
   // println(data[i] + " " + channelData[i] + " " + newData[i]);
   if(newData[i] == true) {
   println("new data sent over serial");
   writeValue(i, channelData[i]); // should probably only call this function if the value has changed (save a lot of time)
   }
   }
   }
  }
}

void writeValue(int _channel, int _data) {
  if(_channel > 3) { // assign one of two dac chips to respond
   dacChip = 1;
  }
  else {
   dacChip = 0;
  }

  /* bit shifting and masking to assemble proper list of bits */
  _channel = _channel << 14;
  updateBits = 3 << 12;
  _channel = _channel | updateBits; // OR to combine
  _data = _data << 2;
  spiWord = _channel | _data;
  binaryString = binary(spiWord, 16);

  outputData.add(byte(dacChip));
  outputData.add(byte(unbinary(binaryString.substring(0, 8))));
  outputData.add(byte(unbinary(binaryString.substring(8, 16))));
  currentTime = millis();
  if(outputData.size() >= 24 || currentTime - previousUpdate >= 10) {
   outputBytes = new byte[outputData.size()];
   for(int i = 0; i < outputData.size(); i++) {
   outputBytes[i] = outputData.get(i);
   }
   teensy.write(outputBytes);
   println(outputBytes);
   dataIndex = 0;
   outputData = new ArrayList();
   previousUpdate = currentTime;
   }
}

class Slider {
  int x, y, value, center;
  int w = 265;
  int h = 12;

  Slider() {
  }

  Slider(int _x, int _y, int _value) {
   x = _x;
   y = _y;
   value = _value;
  }

  int getX() {
   return x;
  }

  int getY() {
   return y;
  }

  void setX(int _x) {
   x = _x;
  }

  void setY(int _y) {
   y = _y;
  }

  int getValue() {
   return value;
  }

  void setValue(int _value) {
   value = _value;
  }
  void update(int _value) {
   setValue(_value);
   drawLine();
   drawPuck();
  }

  void drawLine() {
   line(x, y, x + w, y);
  }
  void drawPuck() {
   center = (int)map(value, 0, 1023, 0, w);
   ellipse(x + center, y, 6, 6);
  }
}

void controlEvent(ControlEvent theEvent) {
  if(theEvent.isGroup()) {
   if(theEvent.group().name() == "serialPorts") {
   teensy = new Serial(this, Serial.list()[(int)theEvent.group().value()], 115200); // open serial port, 115200 rate
   teensy.buffer(1); // seems like this should make transmission more robust, not probably necessary
   portName = ""+ Serial.list()[(int)theEvent.group().value()];
   serialConnected = true;
   return;
   }
   if(theEvent.group().name() == "midiPorts"){
   midi = new MidiBus(this, midi.availableInputs()[(int)theEvent.group().value()], 1);
   println("MIDI port: " + midi.availableInputs()[(int)theEvent.group().value()] + " connected.");
   midi.clearOutputs();
   return;
   }
  }
  if(theEvent.controller().id() == 1) {
   newPort = (int)theEvent.controller().value();
   portNeedsUpdate = true;
  }
}

Voilà ce que dit PrintIn(outputBytes) :

Où l'index

correspond au DAC à sélectionner (0 ou 1),

l'index [1] est le channel
l'index [2] est la valeur.

Première surprise : les valeur et les channel peuvent être négatif !?
Ce qui m'intrigue d'autant plus, c'est que le changement de channel correspond bien au changement de LED évoqué plus haut. Cela signifierai que l'AD5206 comprend un message dont le channel serait supérieur ou inférieur à 5 ? Du genre Channel 6 = Channel 0, Channel 14 == Channel 2 ??

Je continue de chercher de mon côté, mais il me manque encore quelques clefs pour trouver la solution !