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

Lou Crittenden loucrittenden63 at gmail.com
Thu Feb 19 01:10:51 UTC 2015


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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