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high resolution EhrPWM with Ubuntu Linux on BeagleBone
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Sameer  
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 More options Nov 16 2012, 11:46 am
From: Sameer <sam...@falkorsystems.com>
Date: Fri, 16 Nov 2012 08:46:29 -0800 (PST)
Local: Fri, Nov 16 2012 11:46 am
Subject: high resolution EhrPWM with Ubuntu Linux on BeagleBone
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Hi everyone -- another beagle question, hopefully someone here can help?

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,

Anyone know if that is that possible using the standard pwm support?

Thanks,


 
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