Flickering OLED

Projects Programming
59 
#include <Adafruit_GFX.h>
#include <Adafruit_ST7789.h>
#include <SPI.h>

#define TFT_MOSI 23  // Data out
#define TFT_SCLK 18  // Clock out
#define TFT_CS   22// 
#define TFT_DC    21 //
#define TFT_RST   -1  // pin# 2

Adafruit_ST7789 tft = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_RST);

int Hz;
int currentHz;
int previousHz ;

void setup()
{
  tft.init(170, 320);  // high, with
  tft.setRotation(3); // Adjust rotation as needed (0-3),0 = viertical, 1= horyzontal upside down, 2= viertical 180 deg , 3=horyzontal normal,
  tft.fillScreen(ST77XX_BLUE);
  tft.setTextWrap(false); // Disable text wrapping
  tft.setTextSize(4);     // Set text size

  pinMode(12, INPUT_PULLUP);  //amp ++
  pinMode(14, INPUT_PULLUP);  // amp --
  pinMode(2, INPUT_PULLUP);
}

void loop() {
  
  if (digitalRead(12) == LOW)
  {
    Hz++;
  }
  if (digitalRead(14) == LOW)
  {
    Hz--;
  }
  currentHz = Hz;
 

    if ( previousHz != currentHz )
  {
    tft.setCursor(0, 0);
    tft.setTextColor(ST77XX_BLUE); // background color
    tft.print("Hz = ");
    tft.print( previousHz );
    tft.setCursor(0, 0);
    tft.setTextColor(ST77XX_YELLOW);
    tft.print("Hz = ");
    tft.print( currentHz);
  
    previousHz = currentHz;

  }
  delay(300);
}