URL:
<http://savannah.nongnu.org/bugs/?44218>
Summary: linuxgpio not working with raspberryPi 2. "Can't
open gpioX/direction" : Permission denied. Fixed by little delay
Project: AVR Downloader/UploaDEr
Submitted by: None
Submitted on: Mon 09 Feb 2015 11:31:25 PM UTC
Category: None
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name: Rizlik
Originator Email: [email protected]
Open/Closed: Open
Discussion Lock: Any
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Details:
Hi,
When trying to use avrdude with my raspberryPi2 using linuxgpio programmer I
got:
"Can't open gpioX/direction" : Permission denied
When stepping the code in gdb the problem is not reproduced, so I thought that
the problem is that avrdude try to change direction too fast after he exported
the gpio pin.
Indeed adding a little delay before trying to switch direction fixes the
problem. I attach a little patch that solve the problem for me.
Same problem is shown by
$ echo 2 > /sys/class/gpio/export; echo in > /sys/class/gpio2/direction
So isn't a problem of avrdude.
Hope it helps,
rizlik
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File Attachments:
-------------------------------------------------------
Date: Mon 09 Feb 2015 11:31:25 PM UTC Name: gpio_fix.patch Size: 568B By:
None
<http://savannah.nongnu.org/bugs/download.php?file_id=33041>
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<http://savannah.nongnu.org/bugs/?44218>
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