Swapped FT810 pins ?

[cpat]

Hello, 

I made a custom board with the FT810 and after using the GD2 Library I'm having troubles with the screen colors.

After checking the GD2 schematic found here I noticed that the Red, Green and Blue lines have been swapped between the chip output and the LCD connector.

I based my wiring on the the suggested schematic in the FT810 datasheet, considering it as the reference.

Should I change my routing or is there any software workaround ?

Thanks

[jamesbowman]

Yes, there is a register in the FT810 that lets you exchange the pins.

See REG_SWIZZLE on p.27 of the datasheet
brtchip.com/wp-content/uploads/2016/07/DS_FT81x.pdf

In GD3 it is set to 0x03, which exchanges blue and red channels.

[cpat]

May 11, 2018 5:41:01 GMT -8 jamesbowman said:

Yes, there is a register in the FT810 that lets you exchange the pins.

See REG_SWIZZLE on p.27 of the datasheet
brtchip.com/wp-content/uploads/2016/07/DS_FT81x.pdf

In GD3 it is set to 0x03, which exchanges blue and red channels.

Thanks a lot ! 

How do I change the b3 b2 b1 b0 values ?
I found :
#define REG_SWIZZLE           (ft8xx_model ? 0x302064UL : 0x102460UL)in GD2.h library but it doesn't match the datasheet values...

[jamesbowman]

0x302064 and 0x102460 are the register's addresses in the FT810 and FT800 respectively.

One way to set REG_SWIZZLE in your own code by adding this value after GD.begin:


GD.wr(REG_SWIZZLE, 0x00);


[cpat]

Perfect ! It works... a little !

I'm now having another problem (I initially thought it was due to the initial problem but no...)
The part in the setup() function is displayed as it should but not anymore as I place my code in loop().
Usually you advise to start with "Hello World", I did it. It works only with the code in setup().
The loop part displays briefly and disappears to a black screen.
Some register stuff to change ?