ESP32-S3Devkit C1 SPI Problems with Display

[derahnungslose]

Hello everyone,

I am in the process of connecting a 2.8 inch TFT display (ILI9341) to an ESP32 S3. Unfortunately I have not yet managed to get any test codes to run. I am not sure which pins to use. Can you help me or do you have a test code for an ESP32 S3 with the pin connections for this display? Thank you very much!

[srnet]

You can use most any pins.

The TFT display DC,RST and CS are allocated in the normal way.

There are defaults for the SPI pins, but if your not sure just define them like this;

#define MOSI 11
#define SCK 12
#define MISO 13

And then start SPI with;

SPI.begin(SCK, MISO, MOSI);

[horace]

if you run the following on a ESP32-S3-DevKit-1

void setup() {
  Serial.begin(115200);
  delay(2000);
  Serial.print("SDA ");
  Serial.println(SDA);
  Serial.print("SCL ");
  Serial.println(SCL);
  Serial.print("MOSI: ");
  Serial.println(MOSI);
  Serial.print("MISO: ");
  Serial.println(MISO);
  Serial.print("SCK: ");
  Serial.println(SCK);
  Serial.print("SS: ");
  Serial.println(SS);
}

void loop() {}

you get

SDA 8
SCL 9
MOSI: 11
MISO: 13
SCK: 12
SS: 10

which corresponds with the SPI setting of post 2 by @srnet

to test I connected a RA-02 433MHz LoRa module to a ESP32_S3_DevKit_1 SPI using the following

// ESP32_S3_DevKit_1 connections
// ESP32_S3 SCK pin GPIO12  to RA-02_pin SCK
// ESP32_S3 MISO pin GPIO13  to RA-02_pin MISO
// ESP32_S3 MOSI pin GPIO11  to RA-02_pin MOSI
// ESP32_S3 SS  pin GPIO 10   to RA-02 SS
// ESP32_S3 pin GPIO16   to RA-02 Reset
// ESP32_S3 pin GPIO17 to RA-02 DIO0

and it worked transmitting data peer-to-peer to a Raspberry Pi pico RP2040 with a RA-02 LoRa module

[hamokhalil]

Hello @derahnungslose

as @srnet mensioned, you can use most of the pins for that connection.
I am using 1.8 TFT but ST7735 with the following pins:

#define TFT_CS    16  
#define TFT_RST   6   
#define TFT_DC    15  
#define TFT_MOSI  17  
#define TFT_CLK   18  

And then:

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST);

And it works.
You are using ILI9341, that should not be problem since only the driver must be changed.
Alternativly you can use SPI2 with the following pins:

#define SCK       12  
#define SS        10  
#define MOSI      11  
#define MISO      13  

I am using the same MCU: ESP32S3 Devkit 1.
Or you can do as @horace mensioned and figure out which pins are for SPI (default).
I hope that helps you.

[horace]

testing a BuyDisplay ER-TFTM043-3 TFT LCD display using the Adafruit_RA8875 library

File>Examples>Adafruit_RA8875>buildtest compiles and runs OK using ESP32_S3_DevKit_1 SPI pin configuration

// ESP32_S3_DevKit_1 connections
// ESP32_S3 SCK  pin GPIO12 to display JP1/8 SCLK
// ESP32_S3 MISO pin GPIO13 to display JP1/6 SDO
// ESP32_S3 MOSI pin GPIO11 to display JP1/7 SDI
// ESP32_S3 SS   pin GPIO10 to display JP1/5 /SCS

[horace]

trying a ILI9341 color TFT display on a ESP32-S3-DevKitC-1 the following worked OK using the Adafruit_ILI9341 library

#define TFT_CS    10  // no connection on ILI9341
#define TFT_DC    9
#define TFT_MOSI  11
#define TFT_CLK   12
#define TFT_RST   3
#define TFT_MISO  13

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST, TFT_MISO);