FPGA registers userspace interface?

Kfir Lavi lavi.kfir at gmail.com
Mon Jan 3 10:09:52 EST 2011

On Mon, Jan 3, 2011 at 3:00 PM, Philip Downer <phil at pjd.me.uk> wrote:

> On 03/01/11 12:47, Kfir Lavi wrote:
>  I have a FPGA that is constantly changing (its on development phase).
>> I want to let userspace app to update those registers, but don't want to
>> create an API yet.
>> What is the best way to open a range of registers to userspace, so no
>> driver update is required?
> When I had to do this recently I used sysfs, I have no idea if it's the
> best way but it certainly was very effective. Remember in sysfs that each
> file should only have one value.
> Once it's setup though you can just write to the sysfs files, I started by
> writing simple perl scripts to test things before starting to write more
> complex apps.
> Phil
So what do expose in sysfs? for each register - a file of it's own? or you
get a bulk of data to one file?

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