I just built libiio, and tested iio_readdev iio:device0, and the sample
rate is terrible. Just above 1ksps. Just for perspective, this 4-5 times
slower than using sysfs with one-shot mode. Continuous mode through sysfs,
I've gotten up to around 15ksps.
Using mmap() on /dev/mem/ . . . well lets jus
Hi Nuno,
Yeah, Rick and I both know about libiio. We've actually been talking back
and forth by direct email yesterday. I've been attempting to find more
information on how the sample etc are stored in the buffer. I have been
successful reading the buffer one sample at a time however. But the data
On 10/08/2015 10:06 PM, Rick Mann 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.
Hi Rick,
the linux kernel supports IIO (industrial input output) for quite some
There is also another aspect to all of this. I like to solve complicated
problems. Using the third library can solve complex problems. But the
problems I'm usually interested in, is the problem that library has solved.
I often wonder how I could solve the same problem, only better. This is not
to s
>
> *This must be a fundamentally different philosophy.*
>
Indeed. I believe in a minimalist approach where possible.
But at some point, I believe this could be considered "splitting hairs" on
my behalf. As I do use Linux, and POSIX API calls, etc. But all those are
standardized and very well doc
This must be a fundamentally different philosophy. I come from OS X (and
earlier) development, where abstractions are the key to app development. Even
libiio isn't nearly abstract enough for my tastes. It still exposes (or
requires) knowledge about sysfs and the connected devices. The ADC code I
I should probably make it clearer as to what I mean by "bad" in the context
of learning. I love to learn, I think learning is a very good thing. What I
really meant is that something like this is something else you have to
know, before using it. Which is not always convenient of efficient.
Sometime
I do not see where it says mmap() is not so great. I do see where they
imply that mmap() is slower than mmap() + DMA. Which does, can, or
otherwise makes sense. The block copy idea is also pretty cool, but not
unique to iio.
Here is my take on that set of slides:
1. It is already written.
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 w
Yeah wow, I already said that, hah ! Too much going on . . .
On Thu, Oct 8, 2015 at 9:32 PM, William Hermans 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.
>
>
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 wrote:
> Not sure I understand what you're getting at, but I've read that iio
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 th
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 wrote:
>
> I believe the ADC already uses a libiio "driver". Assuming it is the same
> th
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
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
rm...@latencyzero.com
--
For more options, visit http://beagleboard.org/discuss
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