Rockbox Development > New Ports

Cowon D2

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FirleFanz:
Can you post what´s written in the background.bat, please!

karashata:
Sure, it's "rockboxui.exe --background".

FirleFanz:
for linux it is ./rockboxui --background

FranzD2:
Hi!

I'm new to the Rockbox development and i'm trying to figure out how i can help.
My question is related to the lcd panel driver, i was investigating the "2 top lines cut and repeated at the bottom" issue. Looking into the driver code i saw that the power on sequence has been implemented almost exactly as the LTV250QV-F0B datasheet says, exept for three commands that are different,

[lcd-cowon.c : 162] lcd_write_reg(3,  0xE100);         // datasheet says 0x100

[lcd-cowon.c : 165] lcd_write_reg(6,  0x4);               // datasheet says 0xA
[lcd-cowon.c : 166] lcd_write_reg(7,  0x30);             // datasheet says 0x36

I tried to set them to the datasheet values but my screen goes blank.
Could someone please explain me why those command are different (maybe they comes from the OF?)

Thanks & keep on the good work!

shotofadds:
Hi Franz, it's always nice to see new people getting interested! :)

The initialisation commands we use are the same as the original Cowon firmware, as the sequence given in the datasheet didn't work for me either (maybe the D2 LCD is a slightly different revision of the LTV250QV?).

I haven't looked into what the differences are, though. Maybe you could try changing individual bits within those register values to see which changes are important/relevant?

This "cut and repeated lines" problem only seems to happen when the bootloader is used to run the main Rockbox binary (it doesn't seem to happen if Rockbox is booted using tcctool). So it's likely to be provoked by the main Rockbox binary trying to initialise the LCD a 2nd time...

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