Lurkars/bombatuino
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

MIDI-out and MCP23017 sketch

Browse Source
This commit is contained in:
Lukas 2013-02-13 20:05:11 +01:00
parent 67f4285cc2
commit 5c4627d257
1 changed files with 0 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
source/sketches/testing/MIDI-Out_MCP23017.ino
View File

@ -1,48 +0,0 @@
#include <Wire.h>
//helper to check MCP23017 input
#define BIT_IS_SET(i, bits) (1 << i & bits)
//array for the 8 inputs of bank A of MCP23017
boolean button[8];
void setup() {
//set MIDI baudrate
Serial.begin(31250);
//start I2C
Wire.begin();
}
void loop() {
//0x20 address of MCP23017 (A0,A1,A2 to ground)
Wire.beginTransmission(0x20);
Wire.write(0x12); // set MCP23017 memory pointer to GPIOA address
Wire.endTransmission();
Wire.requestFrom(0x20, 1); // request one byte of data from MCP20317
int inputs = Wire.read();
delayMicroseconds(10);
int i;
for(i=0;i<8;i++) {
//checkk for every input if its set
if (BIT_IS_SET(i,inputs)) {
//only send Note-on, when button was not pressed before
if(!button[i]) {
button[i] = true;
midiSignal(144,60+i,115);
}
} else {
//if not pressed, only send Note-off when button was pressed before
if(button[i]) {
button[i] = false;
midiSignal(128,60+i,0);
}
}
}
}
//send MIDI signal
void midiSignal(byte b1, byte b2, byte b3) {
Serial.write(b1);
Serial.write(b2);
Serial.write(b2);
}