SPI Display not working properly

Projects General Guidance
1

I'm trying to get a screen, keypad and some switches (along with some other devices in the future) wired together to make a fun airsoft gamemode. I'm currently testing my keypad, screen and switches, and I'm running into a problem where the levers will always make my screen go to a blank white, and my keypad inputs have a random chance of making my screen go to a blank white. I'm gonna be honest, I really have no experience or knowledge with ESP32 or SPI stuff, and this is all very new to me.

What I do know: Trying to use the LCD_RST pin will just make my screen start white instead of doing it's initial fillScreen, the adafruit graphicstest.ino runs perfectly on the screen.

The hardware I'm using:

Here's my code:

#include <Keypad.h>

#include <SPI.h>

#include <Adafruit_GFX.h>

#include <Adafruit_ILI9341.h>




// SINGLE PINOUT

#define LED_PIN 4

#define SERVO 5

#define BUZZER 6

#define DEFUSE 7

#define TOGGLE_1 15

#define TOGGLE_2 16




// LCD PINOUT

#define LCD_CS 10

#define LCD_DC 9

#define LCD_RST 18




// RC522 PINOUT

#define RC522_CS 14

#define RC522_RST 8




// KEYPAD PINOUT

#define R1 45

#define R2 46

#define R3 21

#define R4 17

#define C1 38

#define C2 39

#define C3 41

#define C4 42




// SHARED

#define SPI_MOSI 11

#define SPI_SCK 12

#define SPI_MISO 13




const byte ROWS = 4;

const byte COLS = 4;

char keys[ROWS][COLS] = { { '1', '2', '3', 'A' },

                          { '4', '5', '6', 'B' },

                          { '7', '8', '9', 'C' },

                          { '*', '0', '#', 'D' } };




byte rowPins[ROWS] = { R1, R2, R3, R4 };

byte colPins[COLS] = { C1, C2, C3, C4 };




Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);




char input[32];

uint8_t len = 0;




Adafruit_ILI9341 tft(LCD_CS, LCD_DC, -1);




bool toggle_1, toggle_2, dbt_1, dbt_2;

unsigned long debounce_1, debounce_2;

const unsigned long debounce = 50;




void setup() {

  Serial.begin(115200);

  delay(1000);

  Serial.println("BOOT");




  pinMode(TOGGLE_1, INPUT_PULLDOWN);

  pinMode(TOGGLE_2, INPUT_PULLDOWN);




  pinMode(RC522_CS, OUTPUT);

  digitalWrite(RC522_CS, HIGH);




  SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);

  tft.begin();

  tft.setRotation(1);

  tft.fillScreen(ILI9341_RED);

  Serial.println("DISPLAY OK");




  dbt_1 = false;

  dbt_2 = false;




  delay(100);

  tft.fillScreen(ILI9341_BLACK);

}




void loop() {

  toggle_1 = digitalRead(TOGGLE_1);

  toggle_2 = digitalRead(TOGGLE_2);




  if (toggle_1 != dbt_1 && (millis() - debounce_1 > debounce)) {

    dbt_1 = toggle_1;

    debounce_1 = millis();

    tft.fillRect(20, 40, 100, 20, ILI9341_BLACK);

    tft.setTextColor(ILI9341_YELLOW);

    tft.setTextSize(2);

    tft.setCursor(20, 40);

    tft.print((toggle_1) ? "TOGGLE_1: ON" : "TOGGLE_1: OFF");

  }

  if (toggle_2 != dbt_2 && (millis() - debounce_2 > debounce)) {

    dbt_2 = toggle_2;

    debounce_2 = millis();

    tft.fillRect(20, 60, 100, 20, ILI9341_BLACK);

    tft.setTextColor(ILI9341_YELLOW);

    tft.setTextSize(2);

    tft.setCursor(20, 60);

    tft.print((toggle_2) ? "TOGGLE_2: ON" : "TOGGLE_2: OFF");

  }




  char key = keypad.getKey();

  if (key) {

    readKeypad(key);

    updateDisplay();

  }

}




void readKeypad(char key) {

  switch (key) {

    case '#':

      input[0] = '\0';

      len = 0;

      break;

    case '*':

      break;

    default:

      if (len < sizeof(input) - 1) {

        input[len++] = key;

        input[len] = '\0';

      }

      break;

  }

}




void updateDisplay() {

  int x = 20;

  int y = 20;

  tft.fillRect(20, 20, 320, 20, ILI9341_BLACK);

  tft.setTextColor(ILI9341_YELLOW);

  tft.setTextSize(2);

  tft.setCursor(x, y);

  tft.print(input);

  Serial.println(input);

}

Any help is appreciated :)

EDIT:
Datasheet for the LCD: 2.4inch LCD Module - Waveshare Wiki
Waiting on seller to get datasheet for the ESP32, it seems to be a standard ESP32-S3-WROOM-U1 chip

2

Links to their datasheets had been interesting. Where to buy them is not.

Schematics are mandatory for a question like this.

Give it another go.

4

Post deleted? Why?

5

Cause I put the datasheets into an edit on the main post, and that's what the reply had

6

They're not! They exist in the notification coming by Email!

7

The difference is that showing the parts limits the number of helpers to those ones having experience of those devices and You might have to wait longer for a reply.

Posting datasheet links a lot more helpers will step in.

8

after doing a lot more testing and debugging, it looks like my lever switches are really unstable which cause the ESP32 digitalRead() to fluctuate between true and false really fast, which overloads the LCD immediately. I've tried some options in software to try and fix it, but it looks like I'm just gonna need to get some different switches or stabilize the current through other means. So I think I'll call this problem solved for now, and I'll make an update when I get the levers working.

9

That's normal. Study "bouncing", rather "debouncing buttons, switches.