Re: [beagleboard] Re: PWM in the 3.13 Kernel
Hi, Check my comment here: http://thread.gmane.org/gmane.comp.hardware.beagleboard.user/65797 -- 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.
Re: [beagleboard] Re: PWM in the 3.13 Kernel
If properly enabled in dtb file during booting, you can always use any peripherals in AM335X SoC. Refer https://github.com/chunsj/nxctrl/blob/master/pwm-test.c, which uses /dev/mem for control pwm. Of course this code does not provide sysfs interface. Sent from my iPad On Apr 18, 2014, at 9:12 PM, halhe...@gmail.com wrote: I retried accessing PWM in the latest 3.13 kernel.with no luck. Is PWM still not supported in 3.13 (under /sys/devices/ocp.#/pwm_test_P9_14.#/) or is there simply a new way to access PWM that I'm not aware of ? Hussam On Tuesday, March 25, 2014 5:29:03 PM UTC-4, halh...@gmail.com wrote: I'm having problems with PWM under the latest 3.13 kernel (built as per the instructions provided @ http://www.eewiki.net/display/linuxonarm/BeagleBone+Black) with a Debian root filesystem.The Device tree seems to support 3 PWM channels on P9_14, P9_16 (ehprwm1ab) P9_42 (ecap0). But when i take a peek at the contents of the /sys/devices/ocp.#/pwm_test_P9_14.#/ directory I do not see the 'period', 'duty', 'run' or 'polarity' files needed to control the PWM channels. Is PWM supported in the 3.13 Kernel yet? Thanks! Hussam -- 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. -- 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.
Re: [beagleboard] Re: PWM in the 3.13 Kernel
Thanks Sungjin! I'll take a look a your codeI'm still curious as to what exactly happened to the pwm sysfs interface in the 3.13 kernel though. If anyone knows please let me/us know Thanks! On Friday, April 18, 2014 8:48:12 AM UTC-4, Sungjin Chun wrote: If properly enabled in dtb file during booting, you can always use any peripherals in AM335X SoC. Refer https://github.com/chunsj/nxctrl/blob/master/pwm-test.c, which uses /dev/mem for control pwm. Of course this code does not provide sysfs interface. Sent from my iPad On Apr 18, 2014, at 9:12 PM, halh...@gmail.com javascript: wrote: I retried accessing PWM in the latest 3.13 kernel.with no luck. Is PWM still not supported in 3.13 (under /sys/devices/ocp.#/pwm_test_P9_14.#/) or is there simply a new way to access PWM that I'm not aware of ? Hussam On Tuesday, March 25, 2014 5:29:03 PM UTC-4, halh...@gmail.com wrote: I'm having problems with PWM under the latest 3.13 kernel (built as per the instructions provided @ http://www.eewiki.net/display/linuxonarm/BeagleBone+Black) with a Debian root filesystem.The Device tree seems to support 3 PWM channels on P9_14, P9_16 (ehprwm1ab) P9_42 (ecap0). But when i take a peek at the contents of the /sys/devices/ocp.#/pwm_test_P9_14.#/ directory I do not see the 'period', 'duty', 'run' or 'polarity' files needed to control the PWM channels. Is PWM supported in the 3.13 Kernel yet? Thanks! Hussam -- 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...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- 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.
