Touchscreen Input Device with RTEMS (evdev)

[furkan bodur]

Firstly thanks for replies,

As I said there is no input folder in /dev path here is the output,

SHLL [/] # ls -las /dev/input

/dev/input: No such file or directory

Here is what I did for use libbsd and evdev,
I builded rtems-freebsd with this,
$ ./waf configure --prefix="$HOME/development/rtems/5"
--rtems-bsps=arm/beagleboneblack
--buildset=buildset/default.ini
$ ./waf
$ ./waf install

Even so, when I realize that there is no input.h or evdev.h file in rtems
includes , I changed some values in the libbsd.py file. Here the things I
changed,
I added 'freebsd/sys/dev' and 'freebsd/sys/dev/evdev' paths to
include-paths.
I added 'freebsd/sys/dev/evdev' path to header-paths.

After that, I did waf again and here is the outputs;

$ ./waf
...
[1519/1939] Compiling freebsd/sys/dev/evdev/evdev.c
...

./waf install
...
+ install
/home/furkan/development/rtems/5/arm-rtems5/beagleboneblack/lib/include/dev/evdev/evdev.h
(from freebsd/sys/dev/evdev/evdev.h)
+ install
/home/furkan/development/rtems/5/arm-rtems5/beagleboneblack/lib/include/dev/evdev/input-event-codes.h
(from freebsd/sys/dev/evdev/input-event-codes.h)
+ install
/home/furkan/development/rtems/5/arm-rtems5/beagleboneblack/lib/include/dev/evdev/input.h
(from freebsd/sys/dev/evdev/input.h)
...

I'm not sure if this is the right way to use evdev. This is how my
application compiles without errors but still there is no /dev/input file.

Vijay Kumar Banerjee <vijay at rtems.org>, 6 Nis 2020 Pzt, 09:43 tarihinde
şunu yazdı:

>
>
> On Mon, Apr 6, 2020 at 5:00 AM Chris Johns <chrisj at rtems.org> wrote:
>
>> On 2020-04-06 06:17, furkan bodur wrote:
>> > Hello everyone,
>> > I am trying to make an simple HMI system . I am using LittlevGL with
>> BSD
>> > framebuffer. Thanks to Vijay, I made a lot of progress, but I can't
>> > figure it out how to use touchscreen or any input devices. I followed
>> > LVGL docs and tried to work with evdev drivers but it doesn't work.
>> >
>> > I used input.h and other necessary headers from rtems-libbsd and my app
>> > successfully compiled but when I run it on the Beagle Black, I am
>> > getting "unable open evdev interface:: No such file or directory" error
>> > in serial screen.
>> >
>> > I checked the files in Serial screen and noticed that there is no input
>> > folder in the /dev directory, as in Linux systems. I think that's the
>> > reason of the error, but I don't know where I made the mistake.
>> >
>> > Any suggestions for me to use evdev properly?
>>
>> I can see there is evdev code in libbsd so at least it is present. Are
>> you able to confirm the evdev code is being built and linked into your
>> application?
>>
>> On FreeBSD I have ...
>>
>> $ ls -las /dev/input
>> total 1
>> 1 dr-xr-xr-x   2 root  wheel   512 Mar 21 08:22 .
>> 1 dr-xr-xr-x  11 root  wheel   512 Mar 21 08:22 ..
>> 0 crw-------   1 root  wheel   0xc Mar 21 08:22 event0
>> 0 crw-------   1 root  wheel  0x29 Mar 21 08:22 event1
>> 0 crw-------   1 root  wheel  0x8f Mar 22 13:42 event2
>> 0 crw-------   1 root  wheel  0xa3 Mar 21 08:23 event4
>>
>> but I am not sure how they were created.
>>
>>
> Hi Furkan,
>
> Thanks for posting about your project in the list, good to know that you
> made progress with it.
>  Please check the command that Chris mentioned. There's evdev code in
> libbsd and is enabled
> in the default build as well,  so it's supposed to be there. If we're
> lucky, the only thing that needs
> to be done in order to run lvgl input is to port lv_drivers input to BSD.
> Currently, it uses Linux
> headers and codes. I think we'll just have to change the header includes
> in lv_drivers/indev/evdev.c
> and if we're lucky, it'll work.
>
> Best regards,
> Vijay
>
>> Chris
>> _______________________________________________
>> users mailing list
>> users at rtems.org
>> http://lists.rtems.org/mailman/listinfo/users
>>
>
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