On 5/15/2014 8:00 PM, Jason Kridner wrote: > I was able to get PWM output, but I'm struggling with GPIOs for some reason: > > root@beaglebone:~# dash -x `which config-pin` P9_18 out > . > . > . > + sudo -A su -c echo out > /sys/class/gpio/gpio4/direction > + echo_dbg echo gpio > /sys/devices/ocp.3/P9_18_pinmux.36/state > + [ -n ] > + sudo -A su -c echo gpio > /sys/devices/ocp.3/P9_18_pinmux.36/state > + exit 0 > > root@beaglebone:~# cat /sys/devices/ocp.3/P9_18_pinmux.36/state > gpio > > root@beaglebone:~# cat /sys/class/gpio/gpio4/direction > out > > root@beaglebone:~# fgrep P9_18 /sys/devices/ocp.3/cape-universal.48/status > 11 P9_18 4 IN 0 > > Thoughts on why this still says "IN" and I don't see output?
Hmm...probably because the cape-universal status under ocp represents the device tree that got exported, where all pins are GPIO inputs with appropriate pull up/down until you change them. Since the settings are changed via the standard GPIO export sysfs files, this doesn't directly affect the device tree and likely isn't getting pulled back into the cape-universal sysfs entries. The pinmux helper and gpio sysfs entries should contain the proper values, and you should get correct results if you: config-pin -q p9.18 -- Charles Steinkuehler char...@steinkuehler.net -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
