From mboxrd@z Thu Jan  1 00:00:00 1970
From: herve Bourricaud <herve.bourricaud@iaca-electronique.com>
Date: Fri, 26 Oct 2012 08:42:01 -0700 (PDT)
Subject: [Buildroot] QT application display problem
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 <508AA9BF.8000704@gmail.com>
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Hi zoltan

yes I'have compiled testapp and QT sample  framebuffer app  myself !
( just running the right qMake and then make with the right compiler  :-)

running it I have 3 beautifuls rectangles Red,gree,blue  on my LCD ! 
and this output on my console 

# ./framebuffer
The framebuffer device was opened successfully.

Fixed screen info:
        id:
        smem_start:  0x23940000
        smem_len:    261120
        type:        0
        type_aux:    0
        visual:      2
        xpanstep:    0
        ypanstep:    1
        ywrapstep:   0
        line_length: 960
        mmio_start:  0x700000
        mmio_len:    4096
        accel:       0

The framebuffer device was mapped to memory successfully.

Successfully switched to graphics mode.

Variable screen info:
        xres:           480
        yres:           272
        xres_virtual:   480
        yres_virtual:   272
        yoffset:        0
        xoffset:        0
        bits_per_pixel: 16
        grayscale: 0
        red:    offset:  0, length:  5, msb_right:  0
        green:  offset:  5, length:  6, msb_right:  0
        blue:   offset: 11, length:  5, msb_right:  0
        transp: offset:  0, length:  0, msb_right:  0
        nonstd:       0
        activate:     0
        height:       0
        width:        0
        accel_flags:  0x0
        pixclock:     120816
        left_margin:  2
        right_margin: 2
        upper_margin: 2
        lower_margin: 2
        hsync_len:    41
        vsync_len:    10
        sync:         3
        vmode:        0

Frame Buffer Performance test...
        Average:   6083 usecs
        Bandwidth: 40.938 MByte/Sec
        Max. FPS:  164.393 fps

Will draw 3 rectangles on the screen,
they should be colored red, green and blue (in that order).
  Done.
#


so I suppose bit per pixels for frame buffer is 16 !
else how to check the frame buffer configuration ?

in buildroot 
     -> Package Selection for the target 
   ?       -> Graphic libraries and applications (graphic/text) 
   ?         -> Qt (BR2_PACKAGE_QT [=y]) 
   ?           -> Gui Module (BR2_PACKAGE_QT_GUI_MODULE [=y]) 
   ?             -> Pixel depths  selected    8/15/16

must I only select 16 ?

thanks for your help !
herv?.





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