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

Lou Crittenden loucrittenden63 at gmail.com
Thu Feb 19 13:14:53 UTC 2015


>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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