GPIO Output

[gicardous]

Hi, please verify this: echo 126 > export echo out > /sys/class/gpio/gpio126/direction echo 1 > /sys/class/gpio/gpio126/value cat /sys/class/gpio/gpio126/value echo 127 > export echo out > /sys/class/gpio/gpio127/direction echo 1 > /sys/class/gpio/gpio127/value cat /sys/class/gpio/gpio127/value Results from the above commands are always 0. Same issue with gpio 133,134,54 which are not assigned to other functions according to schematics. Those pins are not electrically connected yet to anything.

[patrykk]

Please check it:

echo out > direction [root@h4 gpio127]# cat value 0 [root@h4 gpio127]# echo 0 > active_low [root@h4 gpio127]# cat value 0 [root@h4 gpio127]# echo 1 > active_low [root@h4 gpio127]# cat value 1

If it not worki like you want please try revert gpio polarization commit and supply some feedback.

[gicardous]

root@bastus:/sys/class/gpio/gpio127# echo out > direction root@bastus:/sys/class/gpio/gpio127# cat value 0 root@bastus:/sys/class/gpio/gpio127# echo 0 > active_low root@bastus:/sys/class/gpio/gpio127# cat value 0 root@bastus:/sys/class/gpio/gpio127# echo 1 > active_low root@bastus:/sys/class/gpio/gpio127# cat value 1 root@bastus:/sys/class/gpio/gpio127# echo 0 > value root@bastus:/sys/class/gpio/gpio127# cat value 1 As you see is working but i need to change the 'value' not 'active low'.

It works like that on a respberry pi:

root@yo4:/sys/class/gpio/gpio21# echo out > direction root@yo4:/sys/class/gpio/gpio21# cat value 0 root@yo4:/sys/class/gpio/gpio21# echo 0 > active_low root@yo4:/sys/class/gpio/gpio21# cat value 0 root@yo4:/sys/class/gpio/gpio21# echo 1 > active_low root@yo4:/sys/class/gpio/gpio21# cat value 1 root@yo4:/sys/class/gpio/gpio21# echo 0 > value root@yo4:/sys/class/gpio/gpio21# cat value 0 root@yo4:/sys/class/gpio/gpio21#

[patrykk]

Do you have some patches on RPi ? Could you revert https://github.com/patrykk/linux-udoo/commit/dd5bf163c1067dace9b172a119fae3c423797ee2 and test it again?