Flickering OLED

Projects Programming
41

For some reason Hz, previousHz and currentHz are the same ?

#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 = 0;

void setup()
{
  Serial.begin(115200);

  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() {
  // int Hz;
  if (digitalRead(12) == LOW)
  {
    Hz++;
  }
  if (digitalRead(14) == LOW)
  {
    Hz--;
  }
  currentHz = Hz;
  previousHz = currentHz;
  //if ( previousHz != Hz) //  re-writing the old data in background color
  if (currentHz != previousHz)

    //if ( previousHz != currentHz )
  {
    tft.setCursor(0, 0);
    tft.setTextColor(ST77XX_BLUE); // background color
    tft.print( previousHz);
    // tft.print( currentHz);
    tft.setTextColor(ST77XX_YELLOW);
    tft.print("Hz = ");
    tft.print( Hz);
    //tft.println( currentHz);
  }
  // previousHz = currentHz;
  /*
    ///////////////////////
    tft.setTextColor(ST77XX_YELLOW);
    if (currentHz != previousHz)
    {
      tft.setCursor(30, 0);
      tft.fillRect(29, 0, 30, 10, ST77XX_BLUE); //depends on the hight of the font and how long the static text is
      tft.setTextColor(ST77XX_YELLOW);
      tft.print(Hz);
    }
    ///////////////////
  */
  Serial.print("  prev =  "); Serial.print(previousHz);
  Serial.print("  cur =  "); Serial.print(currentHz);
  Serial.print("  Hz =  "); Serial.print(Hz);
  Serial.println();
  delay(100);
}