Rotary encoder platform device driver code examples

Rotary encoder platform device driver code examples

[GRENON Loïc]

Hi guys,

I want to interface a magnetic scale position sensor with a BeagleBone 
Black (an ARM development platform).
While I was reading this following article : 
http://bwgz57.wordpress.com/2012/04/11/beaglebone-with-a-rotary-encoder/ 
I discovered that linux has built-in support for rotary encoders 
connected via GPIO.

The magnetic scale position sensor can be considered like a rotary 
encoder so I would use the rotary_encoder platform device driver.

I've read the code example at the end of this document : 
https://www.kernel.org/doc/Documentation/input/rotary-encoder.txt
But I don't know how to access to the "pos" value of the rotary encoder.

Do you have some code example of use of this driver ? Or anything that 
can be helpful for me.

Thanks,
Regards,

Loïc
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Re: Rotary encoder platform device driver code examples

[Christian Gmeiner]

2013/8/21 GRENON Loïc <difool@rs2i.net>:
> Hi guys,
>
> I want to interface a magnetic scale position sensor with a BeagleBone Black
> (an ARM development platform).
> While I was reading this following article :
> http://bwgz57.wordpress.com/2012/04/11/beaglebone-with-a-rotary-encoder/ I
> discovered that linux has built-in support for rotary encoders connected via
> GPIO.
>
> The magnetic scale position sensor can be considered like a rotary encoder
> so I would use the rotary_encoder platform device driver.
>
> I've read the code example at the end of this document :
> https://www.kernel.org/doc/Documentation/input/rotary-encoder.txt
> But I don't know how to access to the "pos" value of the rotary encoder.
>
> Do you have some code example of use of this driver ? Or anything that can
> be helpful for me.
>

As the rotary encoder is an input device it is accessible via
/dev/input/eventX where X is
a number. Have a look at evtest user space application.

greets
--
Christian Gmeiner, MSc
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