https://github.com/jperkin/node-rpio

Raspberry Pi GPIO library for node.js
https://github.com/jperkin/node-rpio

Last synced: 5 days ago
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Raspberry Pi GPIO library for node.js

• Host: GitHub
• URL: https://github.com/jperkin/node-rpio
• Owner: jperkin
• Created: 2012-10-20T21:44:06.000Z (about 12 years ago)
• Default Branch: master
• Last Pushed: 2024-05-20T10:50:37.000Z (7 months ago)
• Last Synced: 2024-11-24T17:02:17.244Z (20 days ago)
• Language: C
• Size: 551 KB
• Stars: 860
• Watchers: 38
• Forks: 126
• Open Issues: 60
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md

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README

        
node-rpio

=========

This is a high performance node.js addon which provides access to the Raspberry

Pi and SunXi (Allwinner V40) GPIO interfaces, supporting regular GPIO as well

as i²c, PWM, and SPI.

[![NPM version](https://img.shields.io/npm/v/rpio.svg)](https://www.npmjs.com/package/rpio)

[![Node.js version](https://img.shields.io/node/v/rpio.svg)](http://nodejs.org/download/)

[![NPM downloads](https://img.shields.io/npm/dw/rpio.svg)](https://www.npmjs.com/package/rpio)

[![Build Status](https://travis-ci.org/jperkin/node-rpio.svg?branch=master)](https://travis-ci.org/jperkin/node-rpio)

[![License: ISC](https://img.shields.io/badge/License-ISC-yellow.svg)](https://opensource.org/licenses/ISC)

[![License: GPL v2](https://img.shields.io/badge/License-GPL%20v2-yellow.svg)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)

[![Donations](https://img.shields.io/liberapay/receives/jperkin.svg)](https://liberapay.com/jperkin/)

## Compatibility

* Raspberry Pi Models: A, B, A+, B+, 2, 3, 4, 400, Compute Module, Zero.

* SunXi (Allwinner V40) Models: Orange Pi Zero, Banana Pi M2 Zero / Berry.

* Node.js Versions: 0.8, 0.10, 0.12, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.

Currently only basic GPIO is supported on the SunXi chipsets.

Newer versions of node.js require you to install the GCC 4.8 packages for C++11

support.  If you see compilation problems related to C++11, this is the likely

cause.

Due to node-tap requirements the test suite only works on node.js version 6 or

above.

## Install

Install the latest using npm:

```console

$ npm install rpio

```

## Important System Requirements

This module will only interface with hardware on Linux, but should compile on

any other platform, where it will run in mock mode by default.

### Disable GPIO interrupts

If running a newer Raspbian release, you will need to add the following line to

`/boot/config.txt` and reboot:

```

dtoverlay=gpio-no-irq

```

Without this you may see crashes with newer kernels when trying to poll for pin

changes.

### Enable /dev/gpiomem access

By default the module will use `/dev/gpiomem` when using simple GPIO access.

To access this device, your user will need to be a member of the `gpio` group,

and you may need to configure udev with the following rule (as root):

```console

$ cat >/etc/udev/rules.d/20-gpiomem.rules <> 7));

        process.stdout.write(out.toString(16) + ((j % 16 == 0) ? '\n' : ' '));

}

rpio.spiEnd();

```

### Misc

To make code simpler a few sleep functions are supported.

```js

rpio.sleep(n);          /* Sleep for n seconds */

rpio.msleep(n);         /* Sleep for n milliseconds */

rpio.usleep(n);         /* Sleep for n microseconds */

```

There will be a startup cost when calling these functions, so it is worth

performing some initial benchmarks to calculate the latency for your hardware

when using the high resolution functions, then factoring that in to your calls.

Community benchmarks suggest that the cost for `usleep()` is 72 microseconds on

raspi-3 and 130 microseconds on raspi-1, with latency reducing significantly

after the first call.

## Authors and licenses

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

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