Display don't show anything,

[devindasrinath]

Hi,

I followed the given guidelines, built, and uploaded the provided example for the Lilygo T-Watch. I used the provided SDK file and also tried changing the IDF version from 4.4.3 to 4.4.6. However, when I upload the code, the vibration motor starts to vibrate, but the display doesn't show anything. I've encountered the same behavior with the LVGL official ESP IDF library as well.

I would highly appreciate any suggestions or guidance to address this issue.

Thank you,
Devinda

[mdaskalov]

You need to configure the correct GPIOs used by your display. I’ve provided an example sdkconfig file for ttgo-t-display which can be used as a starting point.
However all CONFIG_LV_DISP_* and CONFIG_LV_TFT_* values should be configured for your display - MISO, CLK, CS, DC, RST, BCLK. If you prefer, the GUI could be used with:

idf.py menuconfig

However I would warmly recommend using Visual Studio Code + PlatformIO for development as the ESP-IDF framework is very complicated and slow. You have to compile about 900+ files each time the project is modified...

For simple drawing I would use the TFT_eSPI library which works with almost any display and is much easier to use. You can check the esp32-tetra project as example. Again the GPIOs should be configured in the platformio.ini file for your display.

And if you really need LVGL I would suggest using Tasmota and Berry - have a look at the AnalogClock project.