fix(LVGL port): Fixed monochromatic screen in LVGL9 + example

[espzav]

ESP-BSP Pull Request checklist

• Version of modified component bumped
• CI passing

Change description

• Fixed using monochromatic screens with LVGL port and LVGL9
• Support for LV_COLOR_FORMAT_I1 for monochromatic screen

[tore-espressif]

@espzav Changes LGTM.

Although I don't really understand the monochrome color.
Is this something that was broken by LVGL? Should we migrate to their built-in monochrome color?

[DrStone71]

hi,

with dependencies:
lvgl/lvgl: "==9.2.2"
esp_lcd_sh1107: "==1.1.0"
esp_lvgl_port: "==2.4.2"

i haved make changes and with SSD1306 Display works fine.

Tanks

[obaranov]

I also verified the fix on the ssd1306 (128x64), and graphics now works fine with lvgl9.

dependencies:
  espressif/esp_lvgl_port: 
    git: https://github.com/espressif/esp-bsp.git
    path: components/esp_lvgl_port
    version: fix/lvgl_port_monochromatic_v9

[mutatrum]

Confirmed the fix is working. For the i2c_oled example, when moving to LVGL 9, the following line needs to be removed:

esp-bsp/components/esp_lvgl_port/examples/i2c_oled/sdkconfig.defaults

Line 5 in 240d997

CONFIG_LV_COLOR_DEPTH_1=y

This might need to be added to the readme of that example.

[espzav]

Hi @tore-espressif, I added support for I1 color type for monochromatic screens and fixed some minor issues. PTAL

[mutatrum]

Confirmed, example now works with LVGL 9.2.2 and SSD1306 132x32 display. LGTM. Thanks!

Works with LV_COLOR_DEPTH 1 and 16.

[mutatrum]

Line 73 should be EXAMPLE_LCD_PARAM_BITS constant. (Not sure why it's referring a different line). No functional change, as they are the same value.

[mutatrum]

I've also tested this on an SSH1107 132x64 screen. This works, however, as this screen is oriented differently, I wanted to rotate the screen. Here I noticed the screen rotation is broken in LVGL 9.

With LVGL 8.4, I can just set lv_disp_set_rotation(disp, LV_DISPLAY_ROTATION_90); (or another non-0 value) in the example code and the screen is rotated. With LVGL 9, the application crashes with a WDT when using 90 or 270. 180 is fine. I haven't dug into the code yet.

When I set color_format = LV_COLOR_FORMAT_I1 and a 90 or 270 rotation doesn't crash, but the result is garbled flickering.