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
- Logic Analyzer snapshot of Output Signal 1
- Parallella_gpio.png (26.14 KiB) Viewed 11876 times
- Logic Analyzer snapshot of Output Signal 1
- Parallella_gpio.png (26.14 KiB) Viewed 11876 times
