Which pixel format is more efficent for RGB565?

[JJ.Lin]

Hi,

In my project, the MCU is STM32F429ZE and RGB565 is selected. I found that different image format perform different performance. If all the images was set to RGB565, the framerate is lower than ARGB888. I don't know why? Maybe the former needs extra hardware transform? So which is better for me?

The second question is that: SDRAM is used to cache images and fonts, before touchgfx_init(), I copy all the images and fonts to SDRAM from NAND flash, so will the framerate improved if I set cache for images of current use form SDRAM to SDRAM of cache address ?

Thanks!

[JJ.Lin]

Hello?

[Romain DIELEMAN]

Hi,

Could you share more on your configuration ? Are you working on a custom board or on a ST development kit ? Did you start your project from scratch or from a TBS ? How much "worse" are the performances between the RGB565 and ARGB888 ? Do you use ChromArt ? What is your display interface/color depth/ ... ?

/Romain