Hi,
I managed to have it working.
now I can go further into my project(s)
1-driving more notes (via SPI interfaced MAX7221)
2-Midimerge
3-driving YM2612
keep you informed !
/* Midi In Basic 0.2 // kuki 8.2007 modified OlivarPremier 5.2008
*
-
- listen for midi serial data, and light leds for individual notes
IMPORTANT:
the optocoupler is powered by pin 10
#####################################################################################################################################################
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 setup
byte incomingByte = 255;
byte note = 255;
byte velocity = 255;
int statusLed = 13; // select the pin for the LED
int action=2; //0 =note off ; 1=note on ; 2= nada
//setup: declaring iputs and outputs and begin serial
void 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);
pinMode(10,OUTPUT);
//start serial with midi baudrate 31250 or 38400 for debugging
Serial.begin(31250);
digitalWrite(statusLed,HIGH);
digitalWrite(10, OUTPUT);
}
//loop: wait for serial data, and interpret the message
void 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 > 144){ // message is anything but note message
action=2; //nothing happens
//not implemented yet
//}else if (incomingByte== 160){ // polypressure message starting
//not implemented yet
//process second byte
}else if ( (incomingByte<=127) && (action ==1 || action==0)&&(note==255) ){ // if we received note number message load this byte in the note byte
note=incomingByte;
//process Third byte
}else if ( (incomingByte<=127) && (action ==1)&&(note!=255) ){ // if we received noteon message load this byte in the velocity byte
velocity=incomingByte;
playNote(note, velocity);
note=255;
}else if ( (incomingByte<=127) && (action ==0)&&(note!=255) ){ // if we received note message load this byte in the velocity byte
velocity=0;
playNote(note, velocity);
note=255;
}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);
}
}