"libgpio is a Bash library to manage GPIO chips through the sysfs user interface"
For futher reading, take a look at Documentation/gpio/sysfs.txt (v4.4).
- libgpio works for Linux kernels from v4.1.x to v4.7.x.
- The kernel must be compiled with the
CONFIG_GPIOLIBandCONFIG_GPIO_SYSFSoption
$ wget https://raw.githubusercontent.com/ventto/libgpio/master/libgpio.sh
$ . libgpio.sh$ cd /sys/class/gpio
$ ls -l
gpiochip224/
[... truncated output...]
$ cat gpiochip224/ngpio # print 32, so 32 GPIOS provided by the gpiochip
$ echo 230 > export # export the GPIO n°6: 224 + 6
# make the GPIO n°6 ready to use
$ echo out > gpio230/direction # set the direction
$ echo 1 > gpio230/value # set the GPIO n°6 high
$ echo 230 > unexport # release the GPIO#!/bin/bash
. libgpio.sh
gpio_select_gpiochip 224 # select `/sys/class/gpio/gpiochip224`
gpio_count # print 32, so 32 GPIOs provided by the gpiochip
gpio_export '6' # make the GPIO n°6 ready to use
gpio_direction_output '6' # set the direction
gpio_set_value '6' '1' # set the GPIO n°6 high
gpio_unexport '6' # release the GPIO Name | Output | Return
________________________|_______________________________________|_____________
gpio_select_gpiochip() | - | 0,1,2
gpio_gpiochip_isset() | - | 0,1
gpio_count() | unsigned char: [0;254] | 0,1,3
gpio_export() | - | 0,1,2,3
gpio_unexport() | - | 0,1,2,3
gpio_exported() | - | 0,1,2,3
gpio_unexported() | - | 0,1,2,3
gpio_export_all() | - | 0,1,3
gpio_unexport_all() | - | 0,1,3
gpio_get_edge() | "none", "rising" or "falling" | 0,1,2,3
gpio_get_active_low() | "0" (active_low) or "1" (active_high) | 0,1,2,3
gpio_set_active_low() | - | 0,1,2,3
gpio_get_direction() | "in" (input) or "out" (output) | 0,1,2,3
gpio_direction_input() | - | 0,1,2,3
gpio_direction_output() | - | 0,1,2,3
gpio_get_value() | "0" (low) or "1" (high) | 0,1,2,3
gpio_set_value() | - | 0,1,2,3
return 0: successreturn 1: failreturn 2: bad argsreturn 3:GPIOCHIP_Nvariable not set (c.f: usegpio_select_gpiochip())
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent