LVGL applications with mouse

[Vijay Kumar Banerjee]

On Sun, Jun 14, 2020 at 5:45 PM Christian Mauderer <oss at c-mauderer.de> wrote:
>
> On 14/06/2020 13:26, Vijay Kumar Banerjee wrote:
> > On Sat, Jun 6, 2020 at 4:58 PM Christian Mauderer <oss at c-mauderer.de> wrote:
> >>
> >> On 06/06/2020 13:09, Vijay Kumar Banerjee wrote:
> >>> On Fri, Jun 5, 2020 at 8:30 PM Christian Mauderer <oss at c-mauderer.de> wrote:
> >>>>
> >>>> Hello Vijay,
> >>>>
> >>>> On 04/06/2020 21:36, Vijay Kumar Banerjee wrote:
> >>>>> Hi!
> >>>>>
> >>>>> I had been looking for an opportunity to do this for a long time and I'm
> >>>>> excited to post that LVGL apps on RTEMS can now use input devices
> >>>>> through the evdev interface!
> >>>>
> >>>> Sounds like a nice feature.
> >>>>
> >>>>>
> >>>>> I prepared some BSD evdev patches for lvgl repository and managed to get
> >>>>> them merged upstream. The patchset that I recently send to devel for
> >>>>> libbsd[1] and rtems-littlevgl[2], updates the rtems-libbsd and
> >>>>> rtems-littlevgl repository to adapt to the latest lvgl changes upstream
> >>>>> and adds the evdev support to rtems-littlevgl.
> >>>>>
> >>>>> I wrote an example lvgl application that uses the mouse, connected
> >>>>> through USB port of Beaglebone black. The example application uses the
> >>>>> RTEMS logo, which makes it a bit heavier patch for the devel. I have
> >>>>> posted the commit on my github fork [3] and would really appreciate it
> >>>>> if someone can review and approve it to merge upstream.
> >>>>
> >>>> Although most likely touch screens are more common in embedded systems,
> >>>> it's a good example. A lot of touchscreens should work via evdev too.
> >>>>
> >>> I couldn't work on the touchscreen due to the lack of hardware. The
> >>> intention is indeed to enable the use of a touchscreen or mouse
> >>> through evdev interface.
> >>> Can you please test if the touchscreen works on BBB with evdev01.exe
> >>> test in libbsd? If this works, I'll try to get the touchscreen model
> >>> that you have (most probably after the lockdown is over :) ) and will
> >>> integrate it into the same demo app.
> >>
> >> I would have to try first whether the touch is supported in FreeBSD. I'm
> >> not sure about that. But if you have tested one evdev device, another
> >> one should work too. You did test that the interface between libbsd and
> >> littelvgl works with the mouse.
> >>
> >>>
> >>>> Regarding the logo size: Also an RTEMS logo is a nice idea, maybe
> >>>> something smaller would be better to avoid that big file in the repo?
> >>>> Depending on how you generated the image: Maybe some run length encoding
> >>>> could reduce the size too (for example GIMP offers an option for that
> >>>> when exporting images to C sources).
> >>>>
> >>> Thanks for pointing this out. This indeed lowered the size by half.
> >>> I'm trying to get it working with lvgl and will post a patch to the
> >>> list once I get it done.
> >>
> > Hi Christian,
> >
> > I tried a few times to work out the run-length encoding with lvgl but
> > it's not working quite as expected. I can have a deeper look at it
> > later. The C file I generated with the logo is 282 KB currently, is it
> > too big for the repo? If not, I'd like to make a fresh patch by
> > changing it into a header file and would like to push after a review
> > from the list. If it's big, then I would like to post a patch without
> > any image so that we at least have some example code that uses evdev.
> > We can improve it later when we have time. What do you suggest?
>
> Hi Vijay,
>
> go on with your patch set. We have other big files too. If soeone else
> is unhappy too after you send the whole patch set: Shrink the logo to
> reduce the size.
>

Thanks! Sent the patch. :)
> Best regards
>
> Christian
>
> >
> >
> > Best regards,
> > Vijay
> >> Great.
> >>
> >>>
> >>>>>
> >>>>> Finally, please have a look at this very short video that shows the
> >>>>> example application running. It uses many features of lvgl, including
> >>>>> image, button, and input:
> >>>>> https://blog.thelunatic.dev/assets/video/lvgl_rtems_logo.mp4
> >>>>
> >>>> Looks great.
> >>>>
> >>> Thanks.
> >>>
> >>> Best regards,
> >>> Vijay
> >>>> Best regards
> >>>>
> >>>> Christian
> >>>>
> >>>>>
> >>>>> We can now make full-fledged GUI applications with LVGL on RTEMS. :)
> >>>>>
> >>>>> [1]: https://lists.rtems.org/pipermail/devel/2020-June/060049.html
> >>>>> [2]: https://lists.rtems.org/pipermail/devel/2020-June/060050.html
> >>>>> [3]:
> >>>>> https://github.com/thelunatic/rtems-examples/commit/c526d3c06a69591dc36e62af32728c51012ea6c1
> >>>>>
> >>>>> Thanks!
> >>>>> Vijay
> >>>>>
> >>>>> _______________________________________________
> >>>>> devel mailing list
> >>>>> devel at rtems.org
> >>>>> http://lists.rtems.org/mailman/listinfo/devel
> >>>>>
> >>>
> >