search

cdsteinkuehler / beaglebone-universal-io

Device tree overlay and support scripts for using most available hardware I/O on the BeagleBone without editing dts files or rebuilding the kernel
GNU General Public License v2.0
127 stars 54 forks source link

Loading cape-univ-audio and univ-hdmi #37

Open ghost opened 8 years ago

ghost commented 8 years ago

The "state" directory is not being created when I load both capes. Only cape-universal creates this specific directory. What could have happened?

cdsteinkuehler commented 8 years ago

This is a known problem with the kernel module helper used, which only exports details from the first cape loaded (see issues #29 and #30). That's why the capeuniversala was created, which combines all three capes (universal, emmc, and hdmi). If you still need emmc enabled, you'll need a combination of universal+hdmi, which hasn't been crafted yet.

ghost commented 8 years ago

Got it! So I guess I'll try to craft this combination and see if works. Thanks for your help.

cdsteinkuehler commented 8 years ago

If you get it working, send a pull request! Otherwise, holler if you need help.

ghost commented 8 years ago

Of course! I'll keep in touch.

ghost commented 8 years ago

Ok, I'm trying to craft the cape, but then i've got this problem when I do the following steps:

1) load the cape: echo cape-universalb > /sys/devices/bone_capemgr.9/slots Ok, no problem.

2) configure pin P9.14 to pwm mode: echo pwm > /sys/devices/ocp.3/P9_14_pinmux.49/state Then I got the error "bash: echo: write error: Invalid argument" when I hit enter for the first time. The second time I hit, goes fine. But this error does not occur with cape-universaln, for example. And I believe this is the reason that makes the kernel incapable of recognizing the multiplexation.

How can I send my .dts file to you?

cdsteinkuehler commented 8 years ago

On 12/28/2015 8:36 AM, Bárbara Brandão wrote:

How can I send my .dts file to you?

The best way is to check it in to a github clone of my repository and send me a link. That way, you can send a pull-request once you get it working. :) Otherwise, just email it to me (charles steinkuehler.net).

I suggest after loading your new cape, you poke around in the system log files and examine the sysfs entries for the pinmux helper before and after trying to switch the mode to pwm. That may help turn up what's going wrong.

Charles Steinkuehler charles@steinkuehler.net