There's a good slide presentation on why mmap() isn't so great, and they talk
about the changes they made to the underlying driver and the ioctl() calls they
added. libiio wraps those ioctl calls.
http://events.linuxfoundation.org/sites/events/files/slides/iio_high_speed.pdf
It's not what I envision a proper user-space API should look like, but it's
much closer. I'm hoping I can write one on top of it, perhaps expanding iio.
But when I refer to libiio, I'm also including the necessary updates to the iio
driver system.
> On Oct 8, 2015, at 21:33 , William Hermans <[email protected]> wrote:
>
> Yeah wow, I already said that, hah ! Too much going on . . .
>
> On Thu, Oct 8, 2015 at 9:32 PM, William Hermans <[email protected]> wrote:
> Rick, also for what it's worth. Getting it compiled and working on a system
> does seem very straight forward and is shown step by step on that landing
> page you linked to.
>
> On Thu, Oct 8, 2015 at 9:30 PM, William Hermans <[email protected]> wrote:
> Not sure I understand what you're getting at, but I've read that iio has at
> least two methods of access. Slow( sysfs ), and fast( mmap()). I'm not sure
> that the "fast" method driver exists for our board here in the context of the
> ADC's but certainly the slow sysfs method does. As for the rest of the things
> mentioned on that landing page you pasted a link to . . . it seems that he
> steps are very straight forward to get working, and indeed laid out on that
> exact page.
>
> What are you wanting to do with iio ? The idea of the library does intrigue
> me too. But I'm, not exactly sure I have the time to learn
> yet-another-abstraction-layer . . .
>
> On Thu, Oct 8, 2015 at 8:37 PM, Rick Mann <[email protected]> wrote:
> libiio (along with additional stuff in the kernel that doesn't appear to be
> in 4.1.x-ti) provides for fast ADC access, rather than getting at it through
> sysfs.
>
> > On Oct 8, 2015, at 20:07 , William Hermans <[email protected]> wrote:
> >
> > I believe the ADC already uses a libiio "driver". Assuming it is the same
> > thing I'm thinking of. But for instance when you load the ADC device tree
> > file, it in turn loaded the iio:device0 object for the ADC.
> >
> > Like demonstrated on my blog post here:
> > http://www.embeddedhobbyist.com/2015/10/beaglebone-black-adc/
> >
> > With that said, I do not purport to know very much about it. Just that it
> > exists.
> >
> > On Thu, Oct 8, 2015 at 7:06 PM, Rick Mann <[email protected]> wrote:
> > What would it take to get libiio:
> >
> >
> > https://wiki.analog.com/resources/tools-software/linux-software/libiio
> >
> > Into the BBB kernels? I think this would be amazing.
> >
> >
> > --
> > Rick Mann
> > [email protected]
> >
> >
> > --
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