Raspberry Pi Rtems-Graphical-Toolkit

Mon May 21 16:34:33 UTC 2018

So the minimal example of Qt Widgets + RTEMS LIBBSD + EVDEV will be ~24MB.
It is pretty big. If RTEMS has support of EVDEV or libinput it will be only
~9MB.

Qt does not require MMAP, only LinuxFB plugin. I wrote my own QPA plugin
and it does not need MMAP.

Best regards,
Mikhail

On 21 May 2018 at 17:42, Kirspel, Kevin <Kevin-Kirspel at idexx.com> wrote:

> To give a little background on this subject, the current support in RTEMS
> LIBBSD for the EVDEV input system was motivated by the following:
>
>
>
> - Add a “rtems-arm-4.12-gcc” platform to QT.  This allows you to configure
> QT with RTEMS compilers and libraries.
>
> - Use QT LinuxFB plugin as is for graphics output and system input.
>
>
>
> The QT LinuxFB plugin supports the following input systems: libinput,
> tslib, and EVDEV.  I choose EVDEV because it is supported by LIBBSD.
>
>
>
> --------
>
> As a quick indication of footprint, the EVDEV test in the RTEMS LIBBSD
> test suite is ~4 times the size of the hello world test.  I compiled
> against the xilinx_zynq_a9_qemu BSP but the results were similar to my
> custom LPC3250 BSP.  The hello world test is ~4MB.  The EVDEV test is
> ~15MB.  The EVDEV test pulls in the USB keyboard and mouse drivers.  This
> is where most of the footprint increase comes from.  The EVDEV code itself
> is pretty small.  The frame buffer and touch drivers are also small.
>
>
>
> --------
>
> The frame buffer device in RTEMS is not compatible with QT but it is not
> far off.  QT expects the following Linux headers: “linux/fb.h”,
> “linux/kd.h”, and “sys/kd.h”.  I had ported the Linux headers and placed
> them under the “dev/include/linux” and “dev/include/linux/sys” directories
> in the RTEMS source tree (not currently in the tree because the patches
> were rejected).  QT also expects the frame buffer device to support the
> MMAP device handler.  This was added to Gedare’s MMAP work but as Sebastian
> pointed out it does not follow the design module.  This probably needs to
> be dealt with at some point.
>
>
>
> --------
>
> Right now, the only example on how to use EVDEV is in the LIBBSD test
> suite (evdev01).  I guess the QT source can also be used as an example.
>
>
>
> Kevin Kirspel
>
> Electrical Engineer - Sr. Staff
>
> Idexx Roswell
>
> 235 Hembree Park Drive
> <https://maps.google.com/?q=235+Hembree+Park+Drive+%0D%0A+Roswell+GA+30076&entry=gmail&source=g>
>
> Roswell GA 30076
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>
> Tel: (770)-510-4444 ext. 81642
>
> Direct: (770)-688-1642
>
> Fax: (770)-510-4445
>
>
>
> *From:* Joel Sherrill [mailto:joel at rtems.org]
> *Sent:* Monday, May 21, 2018 9:10 AM
> *To:* Kirspel, Kevin <Kevin-Kirspel at idexx.com>
> *Cc:* Chris Johns <chrisj at rtems.org>; Mikhail Svetkin <
> mikhail.svetkin at gmail.com>; users at rtems.org; Emre Cetin <
> hsnemrecetin at gmail.com>
>
> *Subject:* Re: Raspberry Pi Rtems-Graphical-Toolkit
>
>
>
>
>
> On Mon, May 21, 2018, 7:52 AM Kirspel, Kevin <Kevin-Kirspel at idexx.com>
> wrote:
>
> RTEMS LIBBSD has support for EVDEV which is a standard API for keyboard,
> mouse, and touchscreen.  Is it the best choice, I don't know.  Maybe a
> better question is "What standard input system should RTEMS support?".
>
>
>
> That's the question.
>
>
>
> Using the FreeBSD support has a number of advantages but I admit that I
> didn't know that support was in place. I have no idea what minimum
> footprint using that implies even if you don't use the TCP IP stack.
>
>
>
> In the cpukit there has long been support for a frame buffer device
> framework and a mouse input parsing library. I expect the FreeBSD support
> comes with specific device support that this is weak on.
>
>
>
> But footprint is important. Any idea how large a simple non-networked
> example would be with the FreeBSD code as a base?
>
>
>
> And we need examples and howtos. If I didn't know about it, it isn't
> reasonable to expect someone new to find it. :(
>
>
>
> --joel
>
>
>
>
>
>
>
>
> Kevin Kirspel
> Electrical Engineer - Sr. Staff
> Idexx Roswell
> 235 Hembree Park Drive
> <https://maps.google.com/?q=235+Hembree+Park+Drive+%0D%0ARoswell+GA+30076&entry=gmail&source=g>
> Roswell GA 30076
> Tel: (770)-510-4444 ext. 81642
> Direct: (770)-688-1642
> Fax: (770)-510-4445
>
> -----Original Message-----
> From: Chris Johns [mailto:chrisj at rtems.org]
> Sent: Sunday, May 20, 2018 5:51 PM
> To: Mikhail Svetkin <mikhail.svetkin at gmail.com>; Kirspel, Kevin <
> Kevin-Kirspel at idexx.com>
> Cc: users at rtems.org; Emre Cetin <hsnemrecetin at gmail.com>
> Subject: Re: Raspberry Pi Rtems-Graphical-Toolkit
>
> On 16/5/18 9:39 pm, Mikhail Svetkin wrote:
> >
> > I think it will be very good if RTEMS has some kind of input subsystem
> > (keyboards,  mouse, touchscreen) with standard API.
> >
>
> Do you have an example standard API what would be suitable?
>
> Chris
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>
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