ILI9488 Parallel Interface Support with Tasmota Universal Display Driver on ESP32-S3

[augea]

Hello,

I would like to use an ILI9488 display with the 8-bit parallel interface on an ESP32-S3, running Tasmota with the Universal Display Driver (uDisplay).
I am aware that the SPI interface is supported, but full screen updates are too slow for my application. Therefore, I want to use the parallel interface to achieve faster refresh rates.

Before I invest in hardware and design a custom board, I would like to confirm:

• Is the 8-bit parallel interface for the ILI9488 fully supported by the Universal Display Driver on the ESP32-S3?
• Has anyone successfully used this setup and can share their experience or configuration?
• Are there any known limitations or special requirements for this combination?

According to the Tasmota documentation, the Universal Display Driver supports 8- and 16-bit parallel interfaces, but only on the ESP32-S3. The required parameters (bus size, GPIOs, speed, etc.) can be set in the display configuration file.

Any confirmation or advice from someone who has already implemented this would be greatly appreciated.

Thank you!

[gemu2015]

this is an extremely fast esp32 display and works pretty well with tasmota descriptor: MF_ILI9488_p16_display.ini
https://www.makerfabs.com/esp32-s3-parallel-tft-with-touch-ili9488.html?srsltid=AfmBOop4ds-3y1UglXBw749TzXOXuP0k4xvgbn0DHDfqAUblHH3cXhFt

[augea]

Thank you very much for your helpful feedback!

I noticed that I am running out of GPIOs when using the 16-bit parallel interface together with PSRAM on the ESP32-S3. The MF_ILI9488_p16_display.ini seems to assume a module without PSRAM, since it uses GPIO35, GPIO36, and GPIO37, which are reserved for PSRAM on modules like the ESP32-S3-WROOM-1U-N16R8 and cannot be used for the display data bus.

Therefore, I am now trying to use the 8-bit parallel interface instead.
I would like to ask:
Can somebody confirm that the 8-bit parallel interface works reliably on ILI9488 with the Universal Display Driver (uDisplay) in Tasmota on the ESP32-S3 with PSRAM enabled?

Any experience or working configuration would be greatly appreciated!

[augea]

I built my own board for an ESP32-S3 and an ILI9488 display with an 8-bit interface.
Tasmota works with 8-bit and the following dsipaly.ini file.
I can therefore confirm that the 8-bit interface also works.
It is important to check line 3A,1,55 when derived from SPI interface display.ini

:H,ILI9488,480,320,16,PAR,8,39,38,21,47,48,40,4,5,6,7,15,16,17,18,20
:S,2,1,1,0,40,20
:I
E0,0F,00,03,09,08,16,0A,3F,78,4C,09,0A,08,16,1A,0F
E1,0F,00,16,19,03,0F,05,32,45,46,04,0E,0D,35,37,0F
C0,2,17,15
C1,1,41
C5,3,00,12,80
36,1,48
3A,1,55
B0,1,80
B1,1,A0
B4,1,02
B6,2,02,02
E9,1,00
F7,4,A9,51,2C,82
11,80
29,0
:o,28
:O,29
:A,2A,2B,2C,16
:R,36
:0,28,00,00,85
:1,88,00,00,02
:2,E8,00,00,84
:3,48,00,00,00
:P,18
:i,20,21
:B,20,0
:UTI,FT6236,I1,38,-1,41
RD A8
CP 11
RTF
RD A3
CP 36
RTF
RT
:UTT
RDM 00 16
MV 2 1
RT
:UTX
MV 3 2
RT
:UTY
MV 5 2
RT
#

[s-hadinger]

Thanks a lot for getting back this information