Messages in this thread | | | Date | Thu, 30 Apr 2015 19:30:25 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH v2 0/3] leds: blink resolution improvements |
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Hi!
> >>The following patches improve the precision of led > >>timer trigger and add the delay unit control. > >>That allows to make PWM brightness control with timer > >>trigger. > >Are you sure that is good idea? Doing LED pwm with main cpu is quite harsh... > Do you remember the pc-speaker driver? :)
Actually yes, I do, and that one has the same interface as "normal" sound cards.
> For the timer trigger I would pretty much like my approach to stay. > The reason is that the PWM I need to do, is not strictly a PWM - > it needs the ON period in range of tens or hundreds of milliseconds, > while the OFF period is in a couple of usecs (or vice-versa). No
That is a PWM, right? I see why you'd want to have short "on", but I don't see why you'd want short "off"...
There's one thing you have to do: having two files, one specifiying units and second one specifying timeout is not going to work.
What about simply "echo 0.001 > delay_on"?
Thanks, Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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