You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
62 lines
1.3 KiB
62 lines
1.3 KiB
#include <Wire.h>
|
|
#include <SoftwareSerial.h>
|
|
|
|
#define IOPOLA 0x02
|
|
#define GPPUA 0x12
|
|
#define BIT_IS_SET(i, bits) (1 << i & bits)
|
|
|
|
SoftwareSerial MIDI(10,11);
|
|
|
|
boolean button[8];
|
|
|
|
void setup()
|
|
{
|
|
//printing baudrate
|
|
Serial.begin(9600);
|
|
MIDI.begin(31250);
|
|
Wire.begin();
|
|
Wire.beginTransmission(0x20);
|
|
Wire.write(0x12); // set MCP23017 memory pointer to GPIOB address
|
|
Wire.write(0xFF); //PULLUP
|
|
Wire.endTransmission();
|
|
}
|
|
|
|
void loop()
|
|
{
|
|
Wire.beginTransmission(0x20);
|
|
Wire.write(0x12); // set MCP23017 memory pointer to GPIOB address
|
|
Wire.endTransmission();
|
|
Wire.requestFrom(0x20, 1); // request one byte of data from MCP20317
|
|
int inputs = Wire.read();
|
|
delayMicroseconds(10);
|
|
//check if button is pressed
|
|
|
|
int i;
|
|
for(i=0;i<8;i++) {
|
|
if (BIT_IS_SET(i,inputs)) {
|
|
if(!button[i]) {
|
|
button[i] = true;
|
|
midiSignal(144,60+i,115);
|
|
}
|
|
} else {
|
|
if(button[i]) {
|
|
button[i] = false;
|
|
midiSignal(128,60+i,0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//send MIDI signal through softwareserial
|
|
void midiSignal(byte b1, byte b2, byte b3) {
|
|
Serial.print(b1);
|
|
Serial.print(" ");
|
|
Serial.print(b2);
|
|
Serial.print(" ");
|
|
Serial.print(b3);
|
|
Serial.print(" ");
|
|
Serial.println();
|
|
MIDI.write(b1);
|
|
MIDI.write(b2);
|
|
MIDI.write(b2);
|
|
}
|