Mimimizing flash size

How-to
1

Environment

  • MCU/MPU/Board: Renesas RA6M3
  • LVGL version: 9.2.2

Hello,

I am trying to minimize the amount of flash used by LVGL. I use a Renesas RA6M3 processor, but do not use the newest FSP drivers that include LVGL, as this project is older than that newer FSP version.

How do I minimize the flash usage of LVGL as much as possible?
I have already disabled everything in lv_conf.h except for the button and label types.
I have minimized the “simple” theme to only specify the bare minimum (background colors).

My application only consists of two screens with buttons and text, no scrollbars, no images.
However, when I look at the .map file I end up with objects generated for a lot of things that I do not need, things like lv_obj_scroll.o, and software blending.

I have one font that only consists of the characters I use in my application.

Has anybody found a way to get rid of these seemingly superfluous parts of LVGL that I do not use at all?

2

You can sort the object files by size to see which ones use the most flash. That helps quickly identify what to optimize.

3

Thank you,

I’ve done that. Some of the worst offenders are the scroll object for instance. But I feel like the scrolling is very deeply connected to the touch screen indev drivers, so perhaps there is not much more to be done here?