* high resolution EhrPWM with Ubuntu Linux on BeagleBone
@ 2012-11-16 3:18 Sameer Parekh
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From: Sameer Parekh @ 2012-11-16 3:18 UTC (permalink / raw)
To: linux-arm-kernel
Hello--
Apologies if this is the wrong list for this question-- if someone could point me to the right list, I would appreciate it.
I am trying to get high resolution PWM out of my beagle bone running ubuntu 12.10 to control servos and other hobby RC gear. I have successfully been able to use the /sys/class/pwm/ehrpwm to create PWM output, however I am having trouble with the resolution.
The RC standard is to run at 50Hz with each PWM signal lasting from 1000-2000us. I have set the frequency to 50, however it appears that the duty_cycle must be passed as an integer percentage. Therefore in order to get 1ms I set the duty cycle to 5 and to get 2ms I set the duty cycle to 10. This gives me only 200us resolution, while I would prefer resolution closer to 1us,
Is that possible using the standard pwm support?
Thanks,
--
Sameer Parekh
Falkor Systems, Inc.
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