[Buildroot] setting up directfb for a raspberry pi + waveshare32b display

Lou Crittenden loucrittenden63 at gmail.com
Thu Feb 19 21:46:33 UTC 2015


>Disregard that!! I remember now making the /etc/init.d/s30fbtft script and
I >found the part that has the "swap_xy=0" and am changing it to
"swap_xy=1", >and doing the tweaks from there.

Well, I swapped the axes by changing swap_xy=0 to swap_xy=1 and while it
swapped the axes, I am having an issue where the y-axis is inverted, so
when I move my finger up and down the screen (it is in landscape), the
arrow moves the opposite. If I move the arrow left and right along the
x-axis, it moves properly. How do I fix that y-axis?



On Thu, Feb 19, 2015 at 2:02 PM, Lou Crittenden <loucrittenden63 at gmail.com>
wrote:

> >Hi Lou,
> >Do you want to use qt quick with directfb?
> >I have waveshare 4 inch (A), and for now without any success on this.
> >Everything with OGL is rendered on HDMI output,
> >so I think it's not possible to use fbdev with qt quick. Code with
> widgets works >good.
> >I you will have any success on this, I would be greatful for any info.
> >Regards
> >Zygmunt
>
> Qt quick looks promising to use as an interface for directfb, although I
> never have gotten into it. You mentioning it to me is the first time I have
> heard of it. I watched a demo on how to create an interface here
> https://www.youtube.com/watch?v=_6_F6Kpjd-Q. By the looks of what I saw
> in the vid, it looks promising, but of course that guy made it look easy.
>
> Do you know what framebuffer you are outputting to? Mine is /dev/fb1.
> /dev/fb0 is the hdmi/video out, assuming you are using a raspberry pi.
>
> On Thu, Feb 19, 2015 at 7:27 AM, Zygmunt Ptak <zygmuntptak at gmail.com>
> wrote:
>
>> Hi Lou,
>> Do you want to use qt quick with directfb?
>> I have waveshare 4 inch (A), and for now without any success on this.
>> Everything with OGL is rendered on HDMI output,
>> so I think it's not possible to use fbdev with  qt quick. Code with
>> widgets works good.
>> I you will have any success on this, I would be greatful for any info.
>> Regards
>> Zygmunt
>>
>> 2015-02-19 14:14 GMT+01:00 Lou Crittenden <loucrittenden63 at gmail.com>:
>>
>>> >I was thinking I could make an ads7846 configuration file at
>>> >/etc/modprobe.d>>/00-ads7846.
>>> >conf (like we did with the waveshare32b) to also include the ads7846
>>> >touchscreen device with reversed axes.
>>>
>>> >For starters, the contents will be:
>>>
>>> >options ads7846_device debug=1 cs=1 speed=2000000 model=7846 >x_min=230
>>> x_max=3900 y_min=200 y_max=3700 x_plate_ohms=80 >pressure_max=255
>>> gpio_pendown=23 keep_vref_on=1
>>>
>>> >I will see how this goes and edit accordingly.
>>>
>>> Disregard that!! I remember now making the /etc/init.d/s30fbtft script
>>> and I found the part that has the "swap_xy=0" and am changing it to
>>> "swap_xy=1", and doing the tweaks from there.
>>>
>>> On Wed, Feb 18, 2015 at 7:10 PM, Lou Crittenden <
>>> loucrittenden63 at gmail.com> wrote:
>>>
>>>> I can also confirm that the axes are reversed on the df_bltload by
>>>> running: df_bltload --dfb:fbdev=/dev/fb1.
>>>>
>>>> I was thinking I could make an ads7846 configuration file at
>>>> /etc/modprobe.d/00-ads7846.conf (like we did with the waveshare32b) to also
>>>> include the ads7846 touchscreen device with reversed axes.
>>>>
>>>> For starters, the contents will be:
>>>>
>>>> options ads7846_device debug=1 cs=1 speed=2000000 model=7846 x_min=230
>>>> x_max=3900 y_min=200 y_max=3700 x_plate_ohms=80 pressure_max=255
>>>> gpio_pendown=23 keep_vref_on=1
>>>>
>>>> I will see how this goes and edit accordingly.
>>>>
>>>> On Wed, Feb 18, 2015 at 6:13 PM, Lou Crittenden <
>>>> loucrittenden63 at gmail.com> wrote:
>>>>
>>>>> on the df_knuckles demo, the touch screen works, but it appears that I
>>>>> have reverse the axes somehow, as it appears that if I move my finger left
>>>>> to right, the skull moves up and down and vice versa.
>>>>>
>>>>> On Wed, Feb 18, 2015 at 4:29 PM, Lou Crittenden <
>>>>> loucrittenden63 at gmail.com> wrote:
>>>>>
>>>>>> Got it to work after about a 2 hour rebuild with make clean all and
>>>>>> removing the said option. You guessed properly. I also had to use fb1
>>>>>> instead of fb0. I would love to use fb1 as the default framebuffer.
>>>>>>
>>>>>> On Wed, Feb 18, 2015 at 11:30 AM, Peter Seiderer <ps.report at gmx.net>
>>>>>> wrote:
>>>>>>
>>>>>>> Hello Lou,
>>>>>>>
>>>>>>> On Tue, Feb 17, 2015 at 07:21:36PM -0600, Lou Crittenden wrote:
>>>>>>> > I tried running them and got an error stating it can't find
>>>>>>> /dev/fusion0 or
>>>>>>> > /dev/fusion/0 after running any of the df_knuckles --dfb commands
>>>>>>> with the
>>>>>>> > exception of the help command.
>>>>>>> >
>>>>>>> > Did you have to create new device nodes and directories? I had to
>>>>>>> using
>>>>>>> > mkdir /dev/fusion
>>>>>>> > mkdir /dev/fusion0
>>>>>>> >
>>>>>>> > then made the device nodes with these commands:
>>>>>>> >
>>>>>>> > mknod /dev/fusion/0 c 253 0
>>>>>>> > mknod /dev/fusion/0 c 252 0
>>>>>>> > mknod /dev/fusion0 c 252 0
>>>>>>> > mknod /dev/fusion0 c 253 0
>>>>>>> >
>>>>>>> > I then ran
>>>>>>> > $ df_knuckles --dfb:fbdev=/dev/fb1
>>>>>>> > $ df_dok --dfb:fbdev=/dev/fb1
>>>>>>> > $ df_cpuload --dfb:fbdev=/dev/fb1
>>>>>>> >
>>>>>>> > both as root and as another user and I get:
>>>>>>> > (!) Fusion/Init: could not enter world 0! not a typewriter
>>>>>>> >
>>>>>>> > I have no idea what that means. Other people have gotten the error
>>>>>>> as well,
>>>>>>> > but haven't had solutions, as per various searches.
>>>>>>> >
>>>>>>>
>>>>>>> From package/directfb/directfb.mk:
>>>>>>>
>>>>>>> ...
>>>>>>> ifeq ($(BR2_PACKAGE_DIRECTFB_MULTI),y)
>>>>>>> DIRECTFB_CONF_OPTS += --enable-multi --enable-fusion
>>>>>>> DIRECTFB_DEPENDENCIES += linux-fusion
>>>>>>> endif
>>>>>>> ...
>>>>>>>
>>>>>>> Disable DIRECTFB_MULTI, rebuild directfb and try again (just a
>>>>>>> guess, not tested)...
>>>>>>>
>>>>>>> Regards,
>>>>>>> Peter
>>>>>>>
>>>>>>> > On Tue, Feb 17, 2015 at 4:38 PM, Peter Seiderer <ps.report at gmx.net>
>>>>>>> wrote:
>>>>>>> >
>>>>>>> > > Hello Lou,
>>>>>>> > >
>>>>>>> > > On Thu, Feb 12, 2015 at 05:35:32PM -0600, Lou Crittenden wrote:
>>>>>>> > > > Hi all. I have a buildroot setup running on a raspberry pi
>>>>>>> model b+ and a
>>>>>>> > > > waveshare32b 3.2" display and was able to get the system to
>>>>>>> work with the
>>>>>>> > > > display thanks to peter seiderer's awesome patch that builds
>>>>>>> the fbtft
>>>>>>> > > > drivers for buildroot, but I now would like to set up directfb
>>>>>>> to work on
>>>>>>> > > > this setup. Directfb built nicely, along with sdl and qt5 (I'm
>>>>>>> setting up
>>>>>>> > > > the framework for a gui on a buildroot based media player),
>>>>>>> but I cannot
>>>>>>> > > > get anything to work on directfb. I run the command
>>>>>>> "df_drivertest" that
>>>>>>> > > > tests for the driver, and it gives a
>>>>>>> > > >
>>>>>>> > > > (#) DirectFBError [dfb->CreateSurface( dfb, &dsc, &primary )]:
>>>>>>> The
>>>>>>> > > > requested operation or an argument is (currently)Not
>>>>>>> > > > supported.
>>>>>>> > > >
>>>>>>> > > > The same thing happens when I try to run any of their directfb
>>>>>>> demos.
>>>>>>> > > > I went on their site, directfb.org, and a lot of the links
>>>>>>> that would
>>>>>>> > > > help are dead
>>>>>>> > > >
>>>>>>> > >
>>>>>>> > > Just a quick test:
>>>>>>> > >
>>>>>>> > > $ df_knuckles --dfb:help
>>>>>>> > > $ df_knuckles --dfb:fbdev=/dev/fb1
>>>>>>> > > $ df_dok --dfb:fbdev=/dev/fb1
>>>>>>> > > $ df_cpuload --dfb:fbdev=/dev/fb1
>>>>>>> > >
>>>>>>> > > work for me...
>>>>>>> > >
>>>>>>> > > $ df_drivertest  --dfb:fbdev=/dev/fb1
>>>>>>> > > df_drivertest.c <97>:
>>>>>>> > >         (#) DirectFBError [dfb->CreateSurface( dfb, &dsc,
>>>>>>> &primary )]: The
>>>>>>> > > requested operation or an argument is (currently) not supported
>>>>>>> > >
>>>>>>> > > failes..
>>>>>>> > >
>>>>>>> > > Regards,
>>>>>>> > > Peter
>>>>>>> > >
>>>>>>> > > >
>>>>>>> > > > I want to use a setup lighter than xorg and supports
>>>>>>> touchscreen for a
>>>>>>> > > > gui on a multimedia player I am working on.
>>>>>>> > >
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
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>>
>>
>
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