i2c_oled_example with SSD1306 128x32 display garbled with LVGL 9.2 (BSP-576)

[mutatrum]

Board

ESP32-S3-WROOM-1

Hardware Description

0.91" OLED 128x32 display

IDE Name

vscode

Operating System

Linux

Description

Garbled pixels when running the example after fixing some compiler errors for LVGL 9.2. It works fine with LVGL 8.4. I initially opened espressif/esp-idf#14784 but I think it belongs in this repo. A lot of details including screenshots are there.

Sketch

idf.py create-project-from-example "espressif/esp_lvgl_port^2.3.2:i2c_oled"

Applied the following settings:

CONFIG_IDF_TARGET="esp32s3"
CONFIG_EXAMPLE_SSD1306_HEIGHT_32=y
CONFIG_LV_COLOR_DEPTH_1=y
CONFIG_LV_MEM_SIZE_KILOBYTES=32
CONFIG_LV_TXT_BREAK_CHARS=" ,.;:-_"
CONFIG_LV_USE_OBSERVER=y
CONFIG_LV_USE_SNAPSHOT=y

Changes I made to get it to compile:

Hardcoded lv_obj_set_width in lvgl_demo_ui.c to 128, as the compiler complained about incomplete lv_display_t interface.

Changes I made to get it to run:

Move lv_disp_set_rotation inside of the lvgl_port_lock as it triggers WDT.

[espzav]

@mutatrum Please, could you check this: #398 (comment) ?

[mutatrum]

Unfortunately, that doesn't fix it. Most of the screen is now white, with a distinct double buffer flickering. There is some hint of things moving from left to right, so it has the correct color_map location, but it seems the format is still off.

I reverified with LVGL 8.4, there it works.

[mutatrum]

I don't seem to get it working. I tried a lot of different things, but it always looks like the incoming data in _lvgl_port_transform_monochrome.color_map is already garbled. I'm on an ESP32S3 and a 132.x32 display, maybe that triggers some different behaviour upstream?

[espzav]

When I tried it, I had to fullclean (remove build folder, sdkconfig, managed_components and dependencies.lock) then I removed sdkconfig.defaults (it is for LVGL8). And build it with LVGL 9. Then it was working.
We are working on update LVGL port with support LV_COLOR_FORMAT_I1 .

[mutatrum]

Even with a full clean I can't get it working. Looking forward to I1 support again, that would hopefully make it easier to get working again.

[mutatrum]

Ah I misread your comment, I didn't clear out the sdkconfig.defaults. With that removed and only setting the display height to 32 in menuconfig it works, with the patch from #398.

My guess is CONFIG_LV_COLOR_DEPTH_1=y messes up things and has LVGL set to a half working 1 bit mode, or at least in an incompatible fashion for the ssd1306 support. I don't know if esp_port should panic when that is set, or if it can override that setting before init?

[mutatrum]

Duplicate of #398