Package Exports

rpio

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (rpio) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

node-rpio

This is a super-fast nodejs addon which wraps around Mike McCauley's bcm2835 library to allow mmap access via /dev/mem to the GPIO pins.

Most other GPIO modules use the slower /sys file system interface. You should find this module significantly faster than the alternatives.

Install

Easily install the latest via npm:

$ npm install rpio

API

var rpio = require('rpio');

/*
 * By default the 'gpio' layout is used, i.e. GPIOxx, which maps directly to
 * the underlying pin identifiers used by the bcm2835 chip.  If you prefer,
 * you can refer to pins by their physical header location instead by using:
 *
 *    rpio.setMode('physical').
 */
rpio.setMode('gpio');

// Enable GPIO17 (physical pin 11) and set as read-only
rpio.setInput(17);

// Enable GPIO18 (physical pin 12) and set as read-write
rpio.setOutput(18);

// Read value of GPIO17
console.log('GPIO17 is set to ' + rpio.read(17));

// Set GPIO18 high (i.e. write '1' to it)
rpio.write(18, rpio.HIGH);

// Set GPIO18 low (i.e. write '0' to it)
rpio.write(18, rpio.LOW);

Simple demo

/*
 * Simple demo to flash pin 11 at 100Hz (assuming it's routed to an LED).
 */
var rpio = require('rpio');

// Use physical layout for this one.
rpio.setMode('physical');

// Set physical pin 11 / GPIO17 for write mode
rpio.setOutput(11);

/*
 * Set the pin high every 10ms, and low 5ms after each transition to high.
 */
setInterval(function() {

    rpio.write(11, rpio.HIGH);

    setTimeout(function() {
        rpio.write(11, rpio.LOW);
    }, 5);

}, 10);

Authors and licenses

Mike McCauley wrote src/bcm2835.{cc,h} which are under the GPL.

I wrote the rest, which is under the ISC license unless otherwise specified.