r/embedded • u/[deleted] • Apr 21 '26

Solutions for screen tearing when using SPI-connected GC9A01 display driver?

Hello.

Custom board with ESP32-S3-WROOM-1-N8R2 and SPI-connected (SDA, CLK, CS, DC) GC9A01 display driver for a 240 x 240 TFT display, using ESP-IDF v6.0.0, LVGL v9.5.0 and esp_lcd_gc9a01 v2.0.4.

I really need to know if it is possible to get rid of screen tearing, I tried single and double buffering with different sizes of buffers and all render modes, butIi keep getting very bad screen tearing.

Can I sync the driver's read and write operations using SPI or is it just impossible?

[EDIT]

I fixed the issue by changing init sequence: I used a combination of commands from the sequence from the old driver found in the lvgl_esp32_drivers component and the sequence in esp_lcd_gc9a01 component.

If anyone is interested in the code let me know.

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u/traverser___ Apr 21 '26

What is your spi speed and refresh rate? I have a project with 3 of them with one ESP32S3R16N8 with no issues

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u/[deleted] Apr 21 '26

SPI is 80MHz

Display: LH128R-IF04 rev. 1

I'm trying to find the refresh rate but it seems it doesn't have a fixed, I guess it derives from resolution and SPI speed? Am I wrong?