processing/java/libraries/io/examples/Interrupt/Interrupt.pde at master · allenk/processing · GitHub

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import processing.io.*;

color bgcolor = 0;

// GPIO numbers refer to different phyiscal pins on various boards

// On the Raspberry Pi GPIO 4 is physical pin 7 on the header

// see setup.png in the sketch folder for wiring details

void setup() {

GPIO.pinMode(4, GPIO.INPUT);

GPIO.attachInterrupt(4, this, "pinEvent", GPIO.RISING);

}

void draw() {

background(bgcolor);

}

// this function will be called whenever GPIO 4 is brought from LOW to HIGH

void pinEvent(int pin) {

println("Received interrupt");

if (bgcolor == 0) {

bgcolor = color(255);

} else {

bgcolor = color(0);

}