8-Bit Framebuffer

[dossakab]

Hello everybody, where i can set framebuffer bitness? I got this error:
 

GDISP Framebuffer: The display is 8 not 32 bits per pixel

 

[Joel Bodenmann]

It's part of the board file of the framebuffer. Have a look at the board file template that you can find in the driver directory (/drivers/gdisp/framebuffer/board_framebuffer_template.h).

You might want to get the latest master branch of the µGFX repository to get all the latest framebuffer driver goodness: 

 

[inmarket]

Although not specified above i am guessing that you are using the linux framebuffer. If so what that message is saying is that GDISP_PIXEL_FORMAT does not match the capabilities of the framebuffer linux driver for your machine. Try changing that macro in your gfxconf.h to match the hardware capabilities. 

[dossakab]

So where I can find list of all supported color systems?

[Joel Bodenmann]

Here: http://api.ugfx.io/group___colors.html

You can add your own color format if you need something specialized. Eg. some people on this forum added color formats with an alpha channel.

[dossakab]

Ok, thanks, I've just launched mandelbrot example, and it works fine. But now I trying another example(bubbles), and I have this message:

Linking .build/hello_world
/tmp/cci1nNng.ltrans0.ltrans.o: In function `initialize':
<artificial>:(.text+0x1b64): undefined reference to `sinf'
/tmp/cci1nNng.ltrans0.ltrans.o: In function `matrix':
<artificial>:(.text+0x1c22): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
../resources/ugfx/tools/gmake_scripts/compiler_gcc.mk:282: recipe for target '.build/hello_world' failed
make: *** [.build/hello_world] Error 1

 

[Joel Bodenmann]

This is not at all related to your initial problem / the topic of this forum thread.

We're happy to help wherever we can but please at least try to figure out what the problem is. Googling the error(s) you're getting would instantly give you results. Furthermore, the demo you're trying to compile even comes with a readme file that explains what to do:

In order to run this demo you will have to link against the math libs.
You can do this by adding   -lm   to the   LIBS   variable in your Makefile:

    LIBS = -lm

 

[dossakab]

Thanks!