Closed Bug 1087955 Opened 6 years ago Closed 3 years ago
Prototype GPIO API
The general idea is to enable hobbyist to do all the things in FFOS on devices like RPi, that they can do in OSes like Raspbian on RPi. A proposed API and some discussion around happened here https://groups.google.com/forum/#!topic/mozilla.dev.webapi/4BC0pBzEC7E Judging by reactions, this is a fairly bleeding-edge proposal that may require a lot of pushing to make progress on. That's part of the fun though :). There are several ways to implement this. The most "Gecko-y" way would probably be to add a HAL API for GPIO, an impl of that for linux that poked at the right /sys devices, then put a content-exposed DOM API around the internal HAL API. Many other paths are possible though.
... another path that may be more fun for prototyping is getting a REST API up and running that implements and interface like WebIOPi's https://code.google.com/p/webiopi/wiki/RESTAPI Note too that there's an existing demo build of FFOS that runs within Raspbian, which has a very early prototype GPIO "polyfill" implemented in this way https://wiki.mozilla.org/Foxberry_Pi_Demo If you're *just* implemented in iterating on the API, that build is a perfectly fine way to get started, and test things out.
That would be awsome to have a WebAPI for the GPIO, rather than impementing from scratch, what about using a third party library ? We may also take a look at RPi.GPIO  (the python module source) which has a pretty clean code, that may help.  https://pypi.python.org/pypi/RPi.GPIO
Mailing list discussion: https://groups.google.com/forum/#!topic/mozilla.dev.webapi/4BC0pBzEC7E
My feeling, after worked on this for a while, is that we'd be better off exposing a filesystem API to certified content. Basically fopen/fread/fwrite/fseek/fclose. In userland we can then write a GPIO/I2C/whatever API. Basically this: https://github.com/jan-os/gecko-dev/blob/2adce94e0869606f1825107671ac9b5cc83c7ae2/dom/webidl/Os.webidl, which I use to do GPIO on my Rpi right now.
Just a note to be at parity with Raspbian/RPi: Please make the general GPIO API fast enough for software PWM (see http://raspberrypi.stackexchange.com/questions/298/can-i-use-the-gpio-for-pulse-width-modulation-pwm)
Implementation for Comment 5 is happening in https://bugzilla.mozilla.org/show_bug.cgi?id=1141021
Firefox OS is not being worked on
Status: NEW → RESOLVED
Closed: 3 years ago
Resolution: --- → WONTFIX
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