onoff/integration-test/many-interrupts.js

GPIO access and interrupt detection with Node.js

'use strict';

const assert = require('assert');
const Gpio = require('../onoff').Gpio;
const input = new Gpio(7, 'in', 'both');
const output = new Gpio(8, 'out');

let toggleCount = 0;
let falling = 0;
let rising = 0;

const toggleOutput = _ => {
  output.writeSync(output.readSync() ^ 1);
  toggleCount += 1;
};

const interrupt = (err, value) => {
  if (err) {
    throw err;
  }

  if (value === 1) {
    rising += 1;
  } else if (value === 0) {
    falling += 1;
  }

  assert(output.readSync() === value);

  if (rising + falling < 2000) {
    toggleOutput();
  } else {
    assert(toggleCount === 2000);
    assert(rising === falling);
    assert(rising + falling === toggleCount);

    input.unexport();
    output.writeSync(0);
    output.unexport();

    console.log('ok - ' + __filename);
  }
};

input.watch(interrupt);
toggleOutput();