NO <DUTY, RUN, PERIOD, POLARITY> in bone_capemgr.9(ocp.2/pwm_test_P8_13.#)FILE


I just a fresher did the servo test with my BBB, however, when I use some command as ( tutorial, I just find some serious problem with my pwm setting.

ubuntu@ubuntu-ianymu:/sys/devices/ocp.2/pwm_test_P8_13.14$ ls
modalias power subsystem uevent

I consider there are missing some file with my BBB. it should includes , , , .

So I try to use update it does not work, and use

echo am33xx_pwm > /sys/devices/bone_capemgr.9/


echo bone_pwm_P8_13 > /sys/devices/bone_capemgr.9/slots

it all did not worked on it.

Guys, I have already asked many ask forum about this question, no one know how to fix that. somebody suggest me to change the DEBIAN or ANGSTROM.

I would like to figure it out what’s going on with that problem.

Anyone can help me to solve that? pleeeeeeeeeeeeeeeeeease…

So, there are some information about my bbb and environment.

ubuntu@ubuntu-ianymu:~$ uname -a
Linux ubuntu-ianymu 3.8.13-bone20 #1 SMP Wed May 29 10:49:26 UTC 2013 armv7l armv7l armv7l GNU/Linux

root@ubuntu-ianymu:/sys/kernel/debug# cat /sys/kernel/debug/pwm
platform/48304100.ecap, 1 PWM device
pwm-0 ((null) ):

platform/48304200.ehrpwm, 2 PWM devices
pwm-0 ((null) ):
pwm-1 ((null) ):

platform/48302200.ehrpwm, 2 PWM devices
pwm-0 ((null) ):
pwm-1 ((null) ):

platform/48300100.ecap, 1 PWM device
pwm-0 ((null) ):

platform/48300200.ehrpwm, 2 PWM devices
pwm-0 ((null) ):
pwm-1 ((null) ):

If you need any query please do not hesitate contact with me.

Your sincerely

Ian Mu

I am no expert but I think the post at the bottom of this page may have your answer.

good luck