Resource busy when trying to run pyGpio example program

[Arne Schmitz]

I am trying to run the GPIO example programs as well as doing my own GPIO code and keep running into the same errors. I always get a Errno 16 Resource busy at some point or other.

I have tried ˋecho 14 > /sys/class/gpio/unexportˋ to reset the gpio pin, but that didn't help either.

Any ideas what might be wrong?

[Arne Schmitz]

Ok, so here is code derived from the official GPIO example code (which did not work either):

import onionGpio
import time
import os

print '> Instantiating gpio object'

gpio5 = onionGpio.OnionGpio(5)
gpio11 = onionGpio.OnionGpio(11)
print ''

print '> Set direction to output... '
ret     = gpio5.setOutputDirection()
print '    returned %d'%ret
ret     = gpio11.setOutputDirection()
print '    returned %d'%ret

print '> Set gpio 5 value to 0... '
ret             = gpio5.setValue(0)
print '    returned %d'%ret
time.sleep(0.1)

print '> Set gpio 11 value to 0... '
ret             = gpio11.setValue(0)
print '    returned %d'%ret
time.sleep(0.1)

print '> Set gpio 11 value to 1... '
ret             = gpio11.setValue(1)
print '    returned %d'%ret
time.sleep(0.1)

print ''

I hooked up GPIO11 to my Si470x's RST pin, and the GPIO5 (SDA) to the Si470x board's respective i2c SDA pin.

I cross checked with my Pi that exactly this wiring works (it does, using a small i2cinit tool and the C based RdsPi Si470 software).

When running the above software to try and put the Si470x in two wire mode, I still get the resource busy error:

root@Omega-FF87:~# echo 11 > /sys/class/gpio/unexport 
-ash: write error: Invalid argument
root@Omega-FF87:~# echo 5 > /sys/class/gpio/unexport 
-ash: write error: Invalid argument
root@Omega-FF87:~# python onion-si470x.py > Instantiating gpio object

> Set direction to output... 
Traceback (most recent call last):
  File "onion-si470x.py", line 12, in <module>
    ret         = gpio5.setOutputDirection()
  File "/usr/lib/python2.7/onionGpio.py", line 168, in setOutputDirection
ret         = self._setDirection(argument)
  File "/usr/lib/python2.7/onionGpio.py", line 147, in _setDirection
self.setValue(0)
  File "/usr/lib/python2.7/onionGpio.py", line 85, in setValue
status      = self._initGpio()
  File "/usr/lib/python2.7/onionGpio.py", line 46, in _initGpio
fd.close()
IOError: [Errno 16] Resource busy

I have the feeling that the GPIO libraries on the Omega are totally broken. The only thing I got working was using the gpioctl command line program.

The same stuff seems so much easier on the Pi and much more reliable.

[Kevin McGraynor]

I had the same issue running the sample, I found a bug in the python onionGpio.py library

In the _setDirection function I moved :
# set default for output direction
if direction == _GPIO_OUTPUT_DIRECTION:
self.setValue(0)

so that it followed the :

status = self._freeGpio()

because the setValue call has a __initGpio call in it's code which was being called before the resource had been freed.

[Steven Lutz]

I've tried your fix and i'm still getting the same issue. Can you elaborate on the exact syntax you used to fix this issue?

[Alexandr Didenko]

I'm getting the same issue. How to fix?

[Andreas Lundgren]

I have the same issue with GPIO 11 and GPIO 3. any special caution that's needed for these two GPIO pins when controlling by Python?

GPIO 11 is marked as a GPIO on the pin layout diagram (1.2) but not possible to control via the GPIO App (Omega2+ view) that comes pre installed. Is there anything special with GPIO 11?

For GPIO 3, it's in GPIO mode as it is when booted.

[John_L]

Confirming,
Same error issue when setOutputDirection().
Omega2+ with latest 0.2.0 b190 firmware.

• gpioObj = onionGpio.OnionGpio(gpioNum)

gpioNum
6

status = gpioObj.setOutputDirection()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/onionGpio.py", line 168, in setOutputDirection
ret = self._setDirection(argument)
File "/usr/lib/python2.7/onionGpio.py", line 134, in _setDirection
status = self._initGpio()
File "/usr/lib/python2.7/onionGpio.py", line 46, in _initGpio
fd.close()
IOError: [Errno 16] Resource busy

[ColdDeath]

@administrators @Lazar-Demin Please help, when this bug with GPIO will be fixed? I have same problems on latest firmware:
File "/root/onionGpio.py", line 168, in setOutputDirection
ret = self._setDirection(argument)
File "/root/onionGpio.py", line 134, in _setDirection
status = self._initGpio()
File "/root/onionGpio.py", line 46, in _initGpio
fd.close()
IOError: [Errno 16] Resource busy