Showing White Screen in TFT display with Arduino UNO

Other Hardware Displays
1

I have used a code to show a blinking eye in TFT display but it is showing white screen the code is


#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#include "eyes.h"


void setup() {
  // put your setup code here, to run once:
  pinMode(8,INPUT_PULLUP);
  pinMode(9,INPUT_PULLUP);
  pinMode(10,INPUT_PULLUP);
  pinMode(11,INPUT_PULLUP);
  
  Serial.begin(115200);
  Serial.println("Booting");

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();
  
  // Clear the buffer
  display.clearDisplay();
  display.display();
}

unsigned char readkey(void){ 
  unsigned char ret=0;
    if (digitalRead(8)==0 ) ret=1;  //izquierda
    if (digitalRead(9)==0) ret+=2; //arriba
    if (digitalRead(10)==0) ret+=4; //abajo
    if (digitalRead(11)==0) ret+=8; //fuego
  return (ret);
}

int xp=16;
int mood=1;

void loop() {
  int n;
  static int xd=0;
  static int espera=0;
  static int step=0;
  int x1,x2;
  if (espera>0) {
    espera--;
    delay(1);
  } else {
    x1=   xd+ (xp>16? (16+2*(xp-16)):xp);
    x2=64+xd+ (xp<16? (-16+(xp*2))  :xp);
    switch (step){
      case 0:
       display.clearDisplay(); // Clear the display buffer
       if (xp<6) { 
               display.drawBitmap(x1, 8, peyes[mood][2][0], 32, 32, WHITE);
               display.drawBitmap(x2, 8, peyes[mood][1][1], 32, 32, WHITE);
       } else if (xp<26) {
               display.drawBitmap(x1, 8, peyes[mood][0][0], 32, 32, WHITE);
               display.drawBitmap(x2, 8, peyes[mood][0][1], 32, 32, WHITE); 
       } else {
               display.drawBitmap(x1, 8, peyes[mood][1][0], 32, 32, WHITE); 
               display.drawBitmap(x2, 8, peyes[mood][2][1], 32, 32, WHITE);
       }
       display.display();
       espera=random(250, 1000);
       n=random(0,7);
       if (n==6) {
          step=1;
       } else {
          step=2;
       }
       break;
      case 1:
       display.clearDisplay(); // Clear the display buffer
       display.drawBitmap(x1, 8, eye0, 32, 32, WHITE);
       display.drawBitmap(x2, 8, eye0, 32, 32, WHITE);
       display.display();
       espera=100;
       step=0;
       break;
      case 2:
       n=random(0,10);
       if (n<5) xd--;
       if (n>5) xd++;
       if (xd<-4) xd=-3;
       if (xd>4) xd=3; 
       espera=0;
       step=0;
       break;
    }
  }
//n=0;
n=readkey();
if (n==2) xp=(xp<=0?0:xp-1); 
if (n==4) xp=(xp>=32?32:xp+1);
if (n==1) {
  mood=(mood>=5?0:mood+1);
  do {} while (readkey()!=0);
  }
if (n!=0) { espera=0; step=0; }

}
2

Is your display compatible with your code? Which TFT are you using? Do you have a picture of your display? Your code shows an OLED 128x64 display.

3

Your text says you are using a TFT display, which is showing a white screen. In my experience, that's a sign you are using an LCD display, which is normally connected via SPI, and that you have the backlight successfully connected.

But your code indicates that it's set up for an SSD1306, an OLED display, and that it's connected via I2C.

So, which is it?

4

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