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desculpa não ter tido grande tempo para te ajudar :Solha, estás a usar a biblioteca MIDI para arduino? com essa biblioteca consegues definir funções que são chamadas automaticamente em determinadas situações (eventos). neste caso, a biblioteca MIDI pode fazer-te com que ao receberes uma mensagem midi, se for uma mensagem Control Change, é chamada uma função que tu definiste, se for outra coisa qualquer, é chamada outra função que tu defines. Chamam-se funções call-back.sinceramente nunca cheguei a usar esta biblioteca, mas creio que ao usá-la, possas sentir-te mais seguro de que o teu arduino faz exactamente o que queres!http://www.arduino.cc/playground/Main/MIDILibrary
acho que encontrei a ferramenta de que precisas para poderes enviar MIDI pela porta série de volta para o arduino http://www.stephenhobley.com/blog/2010/02/15/serial-port-midi-relay/
desculpa não ter tido grande tempo para te ajudar :S
/* Midi In Basic 0.2 // kuki 8.2007 * * ----------------- * listen for midi serial data, and light leds for individual notes IMPORTANT: your arduino might not start if it receives data directly after a reset, because the bootloader thinks you want to uplad a new progam. you might need to unplug the midi-hardware until the board is running your program. that is when that statusLed turns on.#####################################################################################################################################################SOMETHING ABOUT MIDI MESSAGES midi messages start with one status byte followed by 1 _or_ 2 data bytes, depending on the command example midi message: 144-36-100 the status byte "144" tells us what to do. "144" means "note on". in this case the second bytes tells us which note to play (36=middle C) the third byte is the velocity for that note (that is how powerful the note was struck= 100) example midi message: 128-36 this message is a "note off" message (status byte = 128). it is followed by the note (data byte = 36) since "note off" messages don't need a velocity value (it's just OFF) there will be no third byte in this case NOTE: some midi keyboards will never send a "note off" message, but rather a "note on with zero velocity" do a web search for midi messages to learn more about aftertouch, poly-pressure, midi time code, midi clock and more interesting things.#####################################################################################################################################################HARDWARE NOTE:The Midi Socket is connected to arduino RX through an opto-isolator to invert the midi signal and seperate the circuits of individual instruments.connect 8 leds to pin2-pin9 on your arduino.#################################################################################################################################################### *///variables setupbyte incomingByte;byte note;byte velocity;int statusLed = 13; // select the pin for the LEDint action=2; //0 =note off ; 1=note on ; 2= nada//setup: declaring iputs and outputs and begin serialvoid setup() { pinMode(statusLed,OUTPUT); // declare the LED's pin as output pinMode(2,OUTPUT); pinMode(3,OUTPUT); pinMode(4,OUTPUT); pinMode(5,OUTPUT); pinMode(6,OUTPUT); pinMode(7,OUTPUT); pinMode(8,OUTPUT); pinMode(9,OUTPUT); //start serial with midi baudrate 31250 or 38400 for debugging Serial.begin(31250); digitalWrite(statusLed,HIGH); }//loop: wait for serial data, and interpret the messagevoid loop () { if (Serial.available() > 0) { // read the incoming byte: incomingByte = Serial.read(); // wait for as status-byte, channel 1, note on or off if (incomingByte== 144){ // note on message starting starting action=1; }else if (incomingByte== 128){ // note off message starting action=0; }else if (incomingByte== 208){ // aftertouch message starting //not implemented yet }else if (incomingByte== 160){ // polypressure message starting //not implemented yet }else if ( (action==0)&&(note==0) ){ // if we received a "note off", we wait for which note (databyte) note=incomingByte; playNote(note, 0); note=0; velocity=0; action=2; }else if ( (action==1)&&(note==0) ){ // if we received a "note on", we wait for the note (databyte) note=incomingByte; }else if ( (action==1)&&(note!=0) ){ // ...and then the velocity velocity=incomingByte; playNote(note, velocity); note=0; velocity=0; action=0; }else{ //nada } }}void blink(){ digitalWrite(statusLed, HIGH); delay(100); digitalWrite(statusLed, LOW); delay(100);}void playNote(byte note, byte velocity){ int value=LOW; if (velocity >10){ value=HIGH; }else{ value=LOW; } //since we don't want to "play" all notes we wait for a note between 36 & 44 if(note>=36 && note<44){ byte myPin=note-34; // to get a pinnumber between 2 and 9 digitalWrite(myPin, value); }}
O R2 é uma pequena alteração no circuito do autoreset, por isso pesquisa unicamente por uno.O programa para reprogramares o Atmega8u2 podes sacar da Atmel e chama-se Flip.
Video!!:P
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Tópico: Modificação de um teclado MIDI (Lida 35332 vezes)
