lvgl 9.x and esp_lvgl_port with ST7796 8bit Parallel (BSP-480)

[sukesh-ak]

I have built a sample using lvgl 9.x + esp_lvgl_port with ST7796 SPI and got it working.

Now I am trying to get ST7796 8bit Parallel working. Could not find a suitable sample to borrow code. And the code snippet mentioned in README.md of esp_bsp is incomplete.

Device being tested on is WT32-SC01 Plus which is ESP32-S3.

Need help since the display is showing only colored dots for now. Sample is here on ST7796P branch. https://github.com/sukesh-ak/IDF5-ESP_LCD-LVGL9/tree/ST7796P

[Lzw655]

Hi @sukesh-ak, I found some points that may lead to the issue:

1. HMI_PIN_NUM_CS pin is set to -1.
2. The LCD initialization code may be needed like below.

[sukesh-ak]

Hi @Lzw655

1. HMI_PIN_NUM_CS pin is set to -1.

CS PIN is already -1 in the working samples.

Here I am trying to make it work using esp_lcd and esp_lvgl_port. Screenshot talks about custom initialization commands. Not sure if they are required?

This was done using LovyanGFX drivers https://github.com/sukesh-ak/ESP32-TUX/blob/master/main/devices/conf_WT32SCO1-Plus.h

[sukesh-ak]

@espzav Can you take a look and help? I don't want to switch back to LovyanGFX. I prefer to use esp_lvgl_port & esp-bsp going forward.

[espzav]

Hi @sukesh-ak, I apologize, I haven't got HW for this screen, but I see in upper comment, you should change vendor config. You can do it here: https://github.com/sukesh-ak/IDF5-ESP_LCD-LVGL9/blob/1532084ed91ca553b749b49b173dbdce1fffd4ad/main/main.c#L286 same as in comment https://github.com/espressif/esp-bsp/issues/315#issuecomment-2021783381. It should work with esp_lvgl_port. I don't see the esp_bsp in your code.

[sukesh-ak]

Hi @sukesh-ak, I apologize, I haven't got HW for this screen, but I see in upper comment, you should change vendor config. You can do it here: https://github.com/sukesh-ak/IDF5-ESP_LCD-LVGL9/blob/1532084ed91ca553b749b49b173dbdce1fffd4ad/main/main.c#L286 same as in comment #315 (comment). It should work with esp_lvgl_port. I don't see the esp_bsp in your code.

I was looking at this example for reference since its for the same controller ST7796 Parallel. https://github.com/espressif/esp-idf/blob/master/examples/peripherals/lcd/i80_controller/main/i80_controller_example_main.c

[sukesh-ak]

@espzav / @Lzw655 Thank you for the help. I got it working without the vendor specific additions.

Also I have built it as a esp_bsp and now available here. https://github.com/sukesh-ak/BSP-IDF5-ESP_LCD-LVGL9

Hope to add support for other popular display devices.

[espzav]

@sukesh-ak Great! Could we close the issue now?

[sukesh-ak]

@sukesh-ak Great! Could we close the issue now?

Yes closing now.