Greyscale pixel format and updating only a partial area to improve framerate (ili9341)

notro / fbtft

Linux Framebuffer drivers for small TFT LCD display modules. Development has moved to https://git.kernel.org/cgit/linux/kernel/git/gregkh/staging.git/tree/drivers/staging/fbtft?h=staging-testing

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Greyscale pixel format and updating only a partial area to improve framerate (ili9341) #488

Closed smlehbleh closed 3 years ago

smlehbleh commented 6 years ago

Hello, I've got a 16:9 video playing back on a 320 x 240 pitft(ili9341) using the fbdev library. Its getting around 19fps which is to be expected.

I was wondering does fbtft support partial updating of the screen? Because its a 16:9 video, theres black bars which are adding unecessary bytes to the transfer.

Also, does fbtft support greyscale format with the ili9341 to possibly triple the frame rate?

Cheers Russell

notro commented 6 years ago

It's a long time since I've used or worked on fbtft, but maybe this pages can give some insight: https://github.com/notro/fbtft/wiki/FPS https://github.com/notro/fbtft/wiki/Performance

If you enable DEBUG_UPDATE_DISPLAY you'll get a line in the kernel log on each update that says which part was updated: https://github.com/notro/fbtft/wiki/Debug http://elixir.free-electrons.com/linux/latest/ident/fbtft_update_display

greyscale

The ILI9341 supports RGB565, RGB666 and a reduce 8-bit color mode for power saving. I couldn't find anything about greyscale in the datasheet.

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