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Parallella Community Supercomputing for Everyone 2016-12-18T21:28:45+00:00 https://parallella.org/forums/feed.php?f=50&t=3755 2016-12-18T21:28:45+00:00 2016-12-18T21:28:45+00:00 https://parallella.org/forums/viewtopic.php?t=3755&p=18404#p18404 <![CDATA[Re: Problems with GPIO]]> (getting the right GPIO pin offset is the key).

https://github.com/parallella/parallell ... linux_gpio

Statistics: Posted by aolofsson — Sun Dec 18, 2016 9:28 pm

]]> 2016-08-18T10:36:49+00:00 2016-08-18T10:36:49+00:00 https://parallella.org/forums/viewtopic.php?t=3755&p=17905#p17905 <![CDATA[[SOLVED] Problems with GPIO]]>
I am working arround to get github sample parallella-utils/gpio_dir working. I don't get Output Signal at Gpio pin as it should be (by the book).
I did the same test fro, comandline -> and it does not work as well.

echo "54" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio54/direction
echo "1" > /sys/class/gpio/gpio54/value

Result should be 1 at gpio port 0.
Yes I got 1, but for 4us only.
If I would like to get a control over the signal length. Although reading from /sys/class/gpio/gpio54/value returns 1 but the output level; at gpio port 0 is 0.
Same problem with other ports and at other Parallella boards as well.

Is there a way to check or correct signal OEN and DIRM at Zinq 7000? (see. Figure 14-2 GPIO Channel in ug585-Zinq-7000-TRM.pdf, pagev 384
Is there any other option to programm Gpio?
Is there a Kernel patch dealing with this problem?

Hope to get some help!

Kind regards,
Daniel

Parallella_gpio.pngParallella_gpio.png

Statistics: Posted by daniel_dbb — Thu Aug 18, 2016 10:36 am

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