Hello,
Newbie question here.
Turns out Bodmer's TFT_eSPI library won't run on Lilygo's T8 board.
To write text°, is there another library I could use?
Thank you.
° Such as
tft.setRotation(1);
tft.fillScreen(TFT_BLACK);
tft.setTextDatum(MC_DATUM)
tft.setTextSize(2);
tft.setTextColor(TFT_BLUE,TFT_BLACK);
tft.drawString("blah", tft.width() / 2, 40);
tft.fillRect(0,0, tft.width(), 60, TFT_BLACK);
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project 
See About the Installation & Troubleshooting category.
Apparently it can work but requires a minor config tweak:
^Lilygo t8 display · Issue #1491 · Bodmer/TFT_eSPI · GitHub
I think your statement is wrong. The cause seems to be the missing DC pin on the display board.
Please provide a link to your display, so we can check.
This may be the solution. Without the link I was not aware that the display is on the TTGO board.
It is a pain using 3-Wire SPI on most MCUs. i.e. DC is the 9th bit.
However ESP32 is easy to configure for 9-bit SPI.
I don't think that I have ever used TFT_eSPI with a 3-Wire SPI interface, but I am sure that it will work fine.
It is a mystery why Chinese companies are always trying to reduce pin-count.
e.g. hard-wiring CS low.
e.g. 3-Wire instead of 4-Wire omitting DC.
e.g. bidirectional SDA pin omits MISO
e.g. omitting RESET. most controllers can perform a SOFTWARE_RESET
The last 2 "tricks" are pretty easy to handle with AVR, SAMD, STM32
The first 2 are horrible.
David.
I found a link to the schematics: LilyGo-T-Display-S2/ESP32_S2-Display.pdf at master · Xinyuan-LilyGO/LilyGo-T-Display-S2 · GitHub
You need to download it to get it readable, then you see that RS is connected to MISO.
If this is really true, then you know the DC pin; RS is a synonym. But I can hardly believe, with all their typos. I like the Charing Cable.
Added: fortunately, they use a different SPI for the SD card.
I posted the link to the board I'm using. Here it is again.
The display is still dark, no matter what I try in User_Setup.h:
//#define ILI9341_DRIVER
#define ST7789_DRIVER
#define TFT_WIDTH 240
#define TFT_HEIGHT 320
//Per https://raw.githubusercontent.com/Bodmer/TFT_eSPI/master/User_Setups/Setup70_ESP32_S2_ILI9341.h
#define TFT_MISO 37
#define TFT_MOSI 35
#define TFT_SCLK 36
#define TFT_CS 34
#define TFT_DC 14
#define TFT_RST 15 //Also tried 37 to match MISO
#define USE_HSPI_PORT
//#include <User_Setup.h> // Default setup is root library folder
#include <User_Setups/Setup71_ESP32_S2_ST7789.h> // Setup file for ESP32 S2 with ST7789
// Setup for the ESP32 S2 with ST7789 display
// Note SPI DMA with ESP32 S2 is not currently supported
#define USER_SETUP_ID 71
#define ST7789_DRIVER // Configure all registers
#define TFT_CS 34 // 10 or 34
#define TFT_MOSI 35 // 11 or 35
#define TFT_SCLK 36 // 12 or 36
#define TFT_MISO 37 // 13 or 37
#define TFT_DC 37 //Same as MISO?
#define TFT_RST 38
// FSPI port will be used unless the following is defined
#define USE_HSPI_PORT
#define LOAD_GLCD
#define LOAD_FONT2
#define LOAD_FONT4
#define LOAD_FONT6
#define LOAD_FONT7
#define LOAD_FONT8
#define LOAD_GFXFF
#define SMOOTH_FONT
#define SPI_FREQUENCY 27000000
#define SPI_TOUCH_FREQUENCY 2500000
Ran TFT_Print.Test.ino
RESULT: Doesn't reboot, pushing RST button does nothing, display remains dark.
Edited Setup71_ESP32_S2_ST7789.h:
// FSPI port will be used unless the following is defined
//#define USE_HSPI_PORT
RESULT: Doesn't reboot, pushing RST button does nothing, display remains dark.
FWIW, it runs CircuitPython successfully.
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