Re: GPIO hardware with good support?

[Marc Balmer <marc%msys.ch@localhost>]

Am 19.08.2009 um 12:39 schrieb Toru Nishimura:

> Emmanuel Dreyfus asked;
>
> > I would like to add a few GPIO pins to a machine that has none for  
> > now.
> > The possible extensions are SMB or USB. So I am looking for a SMB to
> > GPIO or USB to GPIO adapter that works nicely on NetBSD. Someone has
> > some harware to recommand?
>
> Two possiblities come into my mind;
>
> case 1. USB<>GPIO
> case 2. I2C<>GPIO "IO expander"
>
> For case 1 instance, I would suggest handy USB products like;
> http://www.sparkfun.com/commerce/product_info.php?products_id=7841
> http://www.sparkfun.com/commerce/product_info.php?products_id=199
>
> I have no specific product info of I2C IO expander this moment.

Actually a chip for case 2 exists, I even wrote a BSD driver for it  
and have it in use @work.  If it's of interest I will dig up the  
information.

- Marc Balmer

> Toru Nishimura / ALKYL Technology