TouchGFX screen rotation 180 degrees?

[moredatalesscenter]

How to rotate the entire screen by 180 degrees landscape orientation?

[Romain DIELEMAN]

Hi,

Short answer, the 180° rotation is not supported by TouchGFX.

But what is your setup? A lot of displays allow this rotation at a driver level. Another option is to rotate the framebuffer but this is at the expense of a lot of performance loss. You can find how Martin implemented it here in an other post.

/Romain

[moredatalesscenter]

Hi Romain, thanks for the link. I hadn't seen it before.

I managed to implement it at driver level, by reversing every row, byte and bit in the 1bpp framebuffer. I was really hoping for a more efficient solution and one that would also work for the simulator too, given that 90 degree rotation is supported.

Thanks

Simon

[Tuoman]

Parallel interface (8080, 6800) displays can do this by setting MADCTL registers, but is driver level flipping possible in RGB interface displays?

Or maybe one can populate framebuffer back-to-front, I don't know...

[moredatalesscenter]

Another question is relating to my 1bpp black/white screen. In the framebuffer, 0xFF is all white and 0x00 is black/other colour/not set. This causes 2 problems:

1. If I don't have a white box set as background on every screen, then the whole screen appears black. It defaults all pixels not set to white as black - this includes the checkerboard background in new screens. Is there a way to default all pixels that haven't explicitly been set to black as white?
2. All images have to be saved as black white e.g in Paint. If I don't then imageconverter converts every pixel to 0x00 black. Is there a way to control imageconverter with a 50% threshold to decide white or black?

[moredatalesscenter]

Hello, any idea about the 1bpp screen? I've had to add a white box on every screen and save all PNG files as 1bpp. I would have expected that the framebuffer is black only when any pixel is explicitly black.