IOError: [Errno 13] Permission denied: '/sys/class/gpio/gpio298/direction' about opi.gpio

[elpimous]

here are specs :

nvidia@tegra-ubuntu:~$ ls -lL /sys/class/gpio/gpio298
total 0
-rw-r--r-- 1 root root 4096 Jan 21 19:39 active_low
drwxr-xr-x 4 root root    0 Jan 21 15:01 device
-rw-r--r-- 1 root root 4096 Jan 21 19:28 direction
-rw-r--r-- 1 root root 4096 Jan 21 19:39 edge
drwxr-xr-x 2 root root    0 Jan 21 19:39 power
drwxrwx--- 2 root gpio    0 Jan 21 19:28 subsystem
-rw-r--r-- 1 root root 4096 Jan 21 19:28 uevent
-rw-r--r-- 1 root root 4096 Jan 21 19:39 value

[sgjava]

This is for the NanoPi Duo, but maybe it will work with sysfs in general http://www.friendlyarm.com/Forum/viewtopic.php?f=59&t=949. Oh, and don't forget to send us a pic of the eyes!

[rm-hull]

This issue was discussed in #14 - see also https://forum.armbian.com/topic/5225-gpio-from-python-user-space-opigpio-app/

[elpimous]

Hi Richard.
Well, it doesn't work for me. Bad !

the command serial = spi(port=3, device=0, bus_speed_hz=8000000, transfer_size=4096, gpio=GPIO, gpio_DC=1, gpio_RST=2)
returns this error :

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/luma/core/interface/serial.py", line 255, in __init__
    bitbang.__init__(self, gpio, transfer_size, DC=gpio_DC, RST=gpio_RST)
  File "/usr/local/lib/python2.7/dist-packages/luma/core/interface/serial.py", line 153, in __init__
    self._DC = self._configure(kwargs.get("DC"))
  File "/usr/local/lib/python2.7/dist-packages/luma/core/interface/serial.py", line 164, in _configure
    self._gpio.setup(pin, self._gpio.OUT)
  File "/usr/local/lib/python2.7/dist-packages/OPi/GPIO.py", line 370, in setup
    raise e
IOError: [Errno 13] Permission denied: '/sys/class/gpio/export'

Here is my newbie question : can I call this command as root, inside my non-root python ? Perhaps my question is silly, sorry !

[rm-hull]

I think this can be closed with the merge of #28