I found this code on the internet and decided to study programming to use it on my casio keyboard, I have reached the point of perfectly understanding this code and it works! my matrix is 7 x 8,
now I want to make while pressing a button the keys become functions to transpose, and to change channel.
someone can helpme to how i can do that please?
Jorge_Midi_Casio.ino (6.7 KB)
const int row1 = 2;
const int row2 = 3;
const int row3 = 4;
const int row4 = 5;
const int row5 = 6;
const int row6 = 7;
const int row7 = 8;
const int row8 = 9;
// The 74HC595 uses a serial communication
// link which has three pins
const int clock = 11;
const int latch = 12;
const int data = 10;
uint8_t keyToMidiMap[64];
boolean keyPressed[64];
int noteVelocity = 127;
// use prepared bit vectors instead of shifting bit left everytime
int bits[] = { B00000001, B00000010, B00000100, B00001000, B00010000, B00100000, B01000000, B10000000 };
// 74HC595 shift to next column
void scanColumn(int value) {
digitalWrite(latch, LOW); //Pulls the chips latch low
shiftOut(data, clock, MSBFIRST, value); //Shifts out the 8 bits to the shift register
digitalWrite(latch, HIGH); //Pulls the latch high displaying the data
}
void setup() {
// Map scan matrix buttons/keys to actual Midi note number. Lowest num 36 corresponds to C MIDI note.
keyToMidiMap[0] = 0;
keyToMidiMap[1] = 36;
keyToMidiMap[2] = 44;
keyToMidiMap[3] = 52;
keyToMidiMap[4] = 60;
keyToMidiMap[5] = 68;
keyToMidiMap[6] = 76;
keyToMidiMap[7] = 84;
keyToMidiMap[8] = 0;
keyToMidiMap[1 + 8] = 37;
keyToMidiMap[2 + 8] = 45;
keyToMidiMap[3 + 8] = 53;
keyToMidiMap[4 + 8] = 61;
keyToMidiMap[5 + 8] = 69;
keyToMidiMap[6 + 8] = 77;
keyToMidiMap[7 + 8] = 85;
keyToMidiMap[16] = 0;
keyToMidiMap[1 + 16] = 38;
keyToMidiMap[2 + 16] = 46;
keyToMidiMap[3 + 16] = 54;
keyToMidiMap[4 + 16] = 62;
keyToMidiMap[5 + 16] = 70;
keyToMidiMap[6 + 16] = 78;
keyToMidiMap[7 + 16] = 86;
keyToMidiMap[24] = 0;
keyToMidiMap[1 + 24] = 39;
keyToMidiMap[2 + 24] = 47;
keyToMidiMap[3 + 24] = 55;
keyToMidiMap[4 + 24] = 63;
keyToMidiMap[5 + 24] = 71;
keyToMidiMap[6 + 24] = 79;
keyToMidiMap[7 + 24] = 87;
keyToMidiMap[32] = 0;
keyToMidiMap[1 + 32] = 40;
keyToMidiMap[2 + 32] = 48;
keyToMidiMap[3 + 32] = 56;
keyToMidiMap[4 + 32] = 64;
keyToMidiMap[5 + 32] = 72;
keyToMidiMap[6 + 32] = 80;
keyToMidiMap[7 + 32] = 88;
keyToMidiMap[40] = 0;
keyToMidiMap[1 + 40] = 41;
keyToMidiMap[2 + 40] = 49;
keyToMidiMap[3 + 40] = 57;
keyToMidiMap[4 + 40] = 65;
keyToMidiMap[5 + 40] = 73;
keyToMidiMap[6 + 40] = 81;
keyToMidiMap[7 + 40] = 89;
keyToMidiMap[48] = 0;
keyToMidiMap[1 + 48] = 42;
keyToMidiMap[2 + 48] = 50;
keyToMidiMap[3 + 48] = 58;
keyToMidiMap[4 + 48] = 66;
keyToMidiMap[5 + 48] = 74;
keyToMidiMap[6 + 48] = 82;
keyToMidiMap[7 + 48] = 90;
keyToMidiMap[56] = 0;
keyToMidiMap[1 + 56] = 43;
keyToMidiMap[2 + 56] = 51;
keyToMidiMap[3 + 56] = 59;
keyToMidiMap[4 + 56] = 67;
keyToMidiMap[5 + 56] = 75;
keyToMidiMap[6 + 56] = 83;
keyToMidiMap[7 + 56] = 91;
// setup pins output/input mode
pinMode(data, OUTPUT);
pinMode(clock, OUTPUT);
pinMode(latch, OUTPUT);
pinMode(row1, INPUT);
pinMode(row2, INPUT);
pinMode(row3, INPUT);
pinMode(row4, INPUT);
pinMode(row5, INPUT);
pinMode(row6, INPUT);
pinMode(row7, INPUT);
pinMode(row8, INPUT);
pinMode(9, INPUT_PULLUP);
Serial.begin(31250);
//Serial.begin(9600);
delay(1000);
}
void loop() {
for (int col = 0; col < 8; col++) {
// shift scan matrix to following column
scanColumn(bits[col]);
// check if any keys were pressed - rows will have HIGH output in this case corresponding
int groupValue1 = digitalRead(row1);
int groupValue2 = digitalRead(row2);
int groupValue3 = digitalRead(row3);
int groupValue4 = digitalRead(row4);
int groupValue5 = digitalRead(row5);
int groupValue6 = digitalRead(row6);
int groupValue7 = digitalRead(row7);
int groupValue8 = digitalRead(row8);
// process if any combination of keys pressed
if (groupValue1 != 0 || groupValue2 != 0 || groupValue3 != 0 || groupValue4 != 0
|| groupValue5 != 0 || groupValue6 != 0 || groupValue7 != 0 || groupValue8 != 0) {
if (groupValue1 != 0 && !keyPressed[col]) {
keyPressed[col] = true;
noteOn(0x90, keyToMidiMap[col], noteVelocity);
}
if (groupValue2 != 0 && !keyPressed[col + 8]) {
keyPressed[col + 8] = true;
noteOn(0x90, keyToMidiMap[col + 8], noteVelocity);
}
if (groupValue3 != 0 && !keyPressed[col + 16]) {
keyPressed[col + 16] = true;
noteOn(0x90, keyToMidiMap[col + 16], noteVelocity);
}
if (groupValue4 != 0 && !keyPressed[col + 24]) {
keyPressed[col + 24] = true;
noteOn(0x90, keyToMidiMap[col + 24], noteVelocity);
}
if (groupValue5 != 0 && !keyPressed[col + 32]) {
keyPressed[col + 32] = true;
noteOn(0x90, keyToMidiMap[col + 32], noteVelocity);
}
if (groupValue6 != 0 && !keyPressed[col + 40]) {
keyPressed[col + 40] = true;
noteOn(0x90, keyToMidiMap[col + 40], noteVelocity);
}
if (groupValue7 != 0 && !keyPressed[col + 48]) {
keyPressed[col + 48] = true;
noteOn(0x90, keyToMidiMap[col + 48], noteVelocity);
}
if (groupValue8 != 0 && !keyPressed[col + 56]) {
keyPressed[col + 56] = true;
noteOn(0x90, keyToMidiMap[col + 56], noteVelocity);
}
}
// process if any combination of keys released
if (groupValue1 == 0 && keyPressed[col]) {
keyPressed[col] = false;
noteOn(0x90, keyToMidiMap[col], 0);
}
if (groupValue2 == 0 && keyPressed[col + 8]) {
keyPressed[col + 8] = false;
noteOn(0x90, keyToMidiMap[col + 8], 0);
}
if (groupValue3 == 0 && keyPressed[col + 16]) {
keyPressed[col + 16] = false;
noteOn(0x90, keyToMidiMap[col + 16], 0);
}
if (groupValue4 == 0 && keyPressed[col + 24]) {
keyPressed[col + 24] = false;
noteOn(0x90, keyToMidiMap[col + 24], 0);
}
if (groupValue5 == 0 && keyPressed[col + 32]) {
keyPressed[col + 32] = false;
noteOn(0x90, keyToMidiMap[col + 32], 0);
}
if (groupValue6 == 0 && keyPressed[col + 40]) {
keyPressed[col + 40] = false;
noteOn(0x90, keyToMidiMap[col + 40], 0);
}
if (groupValue7 == 0 && keyPressed[col + 48]) {
keyPressed[col + 48] = false;
noteOn(0x90, keyToMidiMap[col + 48], 0);
}
if (groupValue8 == 0 && keyPressed[col + 56]) {
keyPressed[col + 56] = false;
noteOn(0x90, keyToMidiMap[col + 56], 0);
}
}
}
void noteOn(int cmd, int pitch, int velocity) {
int btn1 = digitalRead (13);
if (btn1 == 1) {
Serial.write(cmd);
Serial.write(pitch);
Serial.write(velocity);
}
}
thank you! i dont know how to put the code visible 
i tried to do this at final part to transpose 1 semitones but when release the combination of buttons dont change the pitch :
void noteOn(int cmd, int pitch, int velocity) {
int btn1 = digitalRead (13);
if (btn1 == 0 && pitch == 36){
pitch = pitch + 1;
}
if (btn1 == 1) {
Serial.write(cmd);
Serial.write(pitch);
Serial.write(velocity);
}
}
Those if statements are mutually exclusive. If the pitch is modified, it can never be sent.
I think I should create a variable x that when I press the key + button, 1 is added each time, and at the end in the serial.write(pitch + x) but I don't know how to do it
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