ST7735 Display - ESP32

[4-digital]

I'm trying to connect an ST7735 display, I see that it's supported in version 13 but I'm having trouble finding the necessary information. Which option should I choose for the DisplayModel and what pins should I use for an ESP32? These are the pins from the display:
1 GND
2 VCC
3 SCK
4 SDA
5 RES
6 RS
7 CS
8 LED
Thank you for your help!

[sfromis]

The preferred way is not by DisplayModel, but instead the Universal Display Driver, and a display descriptor to match your display. Available ones does include ST7735. That docs section also alludes to the pins to be configured in Tasmota. Naming on the board can be a bit confusing, but the product docs should explain what's what.

[4-digital]

@sfromis, thank you for your response. I thought that since it is supported by version 13, it gives me the option to configure it in GUI but that's not possible. I tried the option you indicated but still without result. I'm not sure I followed the correct steps: I compiled the tasmota32-display with the #define USE_UNIVERSAL_DISPLAY option. I saved the contents of the ST7735_128x160_display.ini file in the display.ini file, modifying the first line with the pins I'm using. I uploaded this file to the ESP32 through the Manage File System. I configured a GPIO pin with OptionA3. From the console I set DisplayModel 17, DisplayMode 1. I also tried the option to leave the character * in the display.ini file and define the pins used through the graphical interface. I'm not a programmer and a link with more detailed steps on how to use the Universal Display Driver would help me. Thank you.

[sfromis]

You should not need to do anything with DisplayModel, it should become 17 automatically if you have the right setup. What exact gpio config did you do? And wired to what?

What I'd suggest would be to use the precompiled tasmota32-lvgl, which has all the uDisplay support already.

IMO, it is preferable to keep pins as * in the display.ini file, and define all pins in a template/module config.

[sfromis]

When booting with a working setup, you should get messages similar to these:

00:00:00.038 SPI: Hardware using GPIO07(CLK), GPIO11(MOSI) and GPIO09(MISO)
00:00:00.549 DSP: Configured display 'ILI9341'

[martin2705]

@ 4-digital: Can you give me an advise how you connect to the display? I tried a lot but do not find the right connection.
I also got the message with Hardware using Pins, but than there is an error: 00:00:00.064 TFS: File 'mcp23x.dat' not found
So I think, there are some mistakes in the pinning.
my connections:
1 GND - GND
2 VCC - VCC
3 SCK - SPI-CLK
4 SDA - SPI-MOSI
5 RES- VCC
6 RS - GND
7 CS - SPI-CS
8 LED - VCC
Thanks

[sfromis]

00:00:00.064 TFS: File 'mcp23x.dat' not found is not an error message, just an information message rarely relevant. Other messages around that time are more interesting.

But a key point is also what exact binary you flashed with, like if it supports the display. Generally recommended is, as I pointed out earlier, to use the universal display driver with a -lvgl binary variant, making sure to config Option A 3 and having a display descriptor file.

[martin2705]

Hi,
I flashed as suggested the precompiled tasmota32-lvgl

Nothing special around:
00:00:00.003 HDW: ESP32-D0WD-V3 v3.0
00:00:00.040 UFS: FlashFS mounted with 304 kB free
00:00:00.062 CFG: Loaded from File, Count 28
00:00:00.063 FRC: Some settings have been reset (2)
00:00:00.067 SPI: Hardware using GPIO18(CLK), GPIO23(MOSI) and GPIO19(MISO)
00:00:00.072 TFS: File 'mcp23x.dat' not found
00:00:00.154 BRY: Berry initialized, RAM used 5668 bytes
00:00:00.534 DSP: Configured display 'ST7735'
00:00:00.549 Project tasmota - Tasmota Version 13.3.0(lvgl-haspmota)-2_0_14(2023-12-12T14:31:28)
00:00:00.557 LVG: LVGL initialized

Option A 3 is on IO4
Display.ini contains ST7735_128x160_display.ini

Now I get a messagte that the display is configured, there was a mistake in the display.ini.
But the display shows nothing, only blank. :(