Re: Incremental Encoder in Comedi

On Sunday 23 September 2007 15:42, fransenpeter wrote:
> my IO Card has an encoder chip, which computes the position of a
> incremental encoder. The value just has to be read from an address.
>
> My Question is, how do I implement it in the driver? Is there a
> subdevice called "encoder chip"?

It should be a counter subdevice.  See ni_tio.c.  It's a bit complicated, 
but it's the closest thing currently in comedi that I'm aware of.  It 
implements support for the counter's quadrature encoding mode (among 
others).

> Do I get the value with "comedi_data_read" or is there another way?

Yes.

-- 
Frank