From: Lars Poeschel <poeschel@lemonage.de>
To: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Lars Poeschel <larsi@wh2.tu-dresden.de>,
rob@landley.net, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v1] pwm: add sysfs interface
Date: Tue, 9 Apr 2013 11:21:20 +0200 [thread overview]
Message-ID: <201304091121.20510.poeschel@lemonage.de> (raw)
In-Reply-To: <20130408113457.GA17028@avionic-0098.mockup.avionic-design.de>
On Monday 08 April 2013 at 13:34:58, Thierry Reding wrote:
> By the way, would you mind elaborating a bit on the various use-cases
> that you have? I'm interested in what people use the PWM subsystem for
> and you seem to be the only one currently using it from userspace. I'm
> hoping I can get a better understanding of what the PWM subsystem nedes
> to provide if I know what people use it for.
Sure, but there is not much about it:
The PWM output is connected to an electronic circuit that converts the
signal to a voltage. The higher the duty cycle is the higher the voltage
gets. In fact this is a simple DAC converter. This voltage limits the
electric current a battery recharger uses to charge a battery. We think
controlling the PWM from userspace is a simple way for our application to
control the voltage.
If you have further questions feel free to ask.
Lars
next prev parent reply other threads:[~2013-04-09 9:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-03 13:58 [PATCH v1] pwm: add sysfs interface Lars Poeschel
2013-04-08 8:17 ` Thierry Reding
[not found] ` <201304081315.37794.poeschel@lemonage.de>
2013-04-08 11:34 ` Thierry Reding
2013-04-09 9:21 ` Lars Poeschel [this message]
-- strict thread matches above, loose matches on Subject: below --
2013-04-08 11:55 Lars Poeschel
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