coolpi 4b python3 gpio operation compatable with raspberry pi

花月

@jack_admin 这个附件名称是什么，下载是数字的名称，有后缀嘛？

jack_admin

@花月可以拷贝重命名/usr/sbin/gpio_coolpi

dreamer

@george Is there any way to use GPIOs without sudo priviledge, such as in a ros package?

大法师

@dreamer
hi, please add extra operation for coolpi user.

Add rules for normal user:

sudo echo "SUBSYSTEM==\"gpio*\", ACTION==\"add\", PROGRAM=\"/bin/bash -c 'chown root:coolpi /sys/class/gpio/export /sys/class/gpio/unexport;chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'\"" > /lib/udev/rules.d/99-gpio.rules
sudo echo "SUBSYSTEM==\"gpio*\", ACTION==\"add\", PROGRAM=\"/bin/bash -c 'chown root:coolpi /sys%p/direction /sys%p/value /sys%p/edge /sys%p/active_low; chmod 0660 /sys%p/direction /sys%p/value /sys%p/edge /sys%p/active_low'\"" >> /lib/udev/rules.d/99-gpio.rules
sudo reboot

Check rules:

coolpi@coolpi:~/Desktop$ cat /lib/udev/rules.d/99-gpio.rules 
SUBSYSTEM=="gpio*", ACTION=="add", PROGRAM="/bin/bash -c 'chown root:coolpi /sys/class/gpio/export /sys/class/gpio/unexport;chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'"
SUBSYSTEM=="gpio*", ACTION=="add", PROGRAM="/bin/bash -c 'chown root:coolpi /sys%p/direction /sys%p/value /sys%p/edge /sys%p/active_low; chmod 0660 /sys%p/direction /sys%p/value /sys%p/edge /sys%p/active_low'"

Test case:

coolpi@coolpi:~/Desktop$ echo 115 > /sys/class/gpio/export 
coolpi@coolpi:~/Desktop$ ls /sys/class/gpio/gpio115
active_low  device  direction  edge  power  subsystem  uevent  value
coolpi@coolpi:~/Desktop$ echo out > /sys/class/gpio/gpio115/direction 
coolpi@coolpi:~/Desktop$ echo 1 > /sys/class/gpio/gpio115/value 
coolpi@coolpi:~/Desktop$ echo 0 > /sys/class/gpio/gpio115/value 
coolpi@coolpi:~/Desktop$

Screenshot from 2023-01-16 13-14-27.png