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digital lcd output on davinci dm355

xpc
Prodigy 100 points

Hi, all,

I'm trying to connect a custom lcd rgb565 display to the dc5 connector of dm355.

The boot params in the u-boot env include "davinci_enc_mngr.ch0_output=LCD davinci_enc_mngr.ch0_mode=640x480"

I can see the LCD_OE, HSYNC, VSYNC signals and 27MHz VCLK on the osciloscope, but there are no signals on the video data output pins.

I'm using dvsdk_2_00_00_18, montavista 5.0 and kernel linux-2.6.18_pro500.

I would be very thankful if someone can help me to make this display work.

 

Thanks in advance

Hristo Tsenov

AsisBG - Varna

  • 0
    TI__Mastermind 37340 points

    I would check two things

    1) Make sure LCD driver is enabled in kernel (see V4L2 User Guide, spruel3.pdf for included in DVSDK for more details).

    2) Make sure LCD interface is enabled, you can do this by using the following commands described in spruel6.pdf (DaVinci Linux Video Sysfs) and spruek9.pdf (VPBE Frame Buffer Driver User Guide), both of which should be part of DVSDK install (look under PSP_x_xx_xx_xxx directory).

    >echo "LCD" >/sys/class/davinci_display/ch0/output

    >fbset -fb /dev/fb/0 -xres 640 -yres 480 -vxres 640 -vyres 960 -depth 32 -nonstd 0 -laced 0