dvlopt.linux.gpio
Handle GPIO lines in a fast and portable way from Clojure.
Based on linux-gpio.java. Go there for rationale and background. In short, this API controls GPIO device from user space by using the "new" Linux API which is convenient, standard, and offers a some advantages over other methods (eg. automatic clean-up of resources when lines are released).
Usage
Read the API.
Have a look at the examples.
Attention, at least read permission is needed for the used GPIO devices, which is enough even for writing to outputs.
For instance :
(require '[dvlopt.linux.gpio :as gpio])
;; Alternating between 2 leds every time a button is released.
;;
;; After opening a GPIO device, we need a handle for driving the leds and a watcher
;; for monitoring the button. A buffer is used in conjunction with the handle in
;; order to describe the state of the leds.
(with-open [^AutoCloseable device (gpio/device "/dev/gpiochip0")
^AutoCloseable led-handle (gpio/handle device
{17 {::gpio/state false
::gpio/tag :led-1}
18 {::gpio/state true
::gpio/tag :led-2}}
{::gpio/direction :output})
^AutoCloseable button-watcher (gpio/watcher device
{22 {::gpio/direction :input}})]
(let [buffer (gpio/buffer led-handle)]
(loop [leds (cycle [:led-1
:led-2])]
(gpio/write led-handle
(gpio/set-lines buffer
{(first leds) true
(second leds) false}))
(gpio/event button-watcher)
(recur (rest leds)))))License
Copyright © 2018 Adam Helinski
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.
