ST7735 Menu item smooth scrolling

Projects Programming
5

@blh64 Many thanks for your help..... Your code without delay() is working perfectly.

But the flickering problem wasn't solved. I think delay is not take effect on screen update.

Redrawing the rectangle is the problem. How can I update the triangle without redrawing. This is the redrawing line:

for (byte i = menuStartAt; i < (menuStartAt + LCD_ROWS); i++) {
    byte markerY = (i - menuStartAt) * MENU_ROW_HEIGHT;
    if (i == menuPos) {
      lcd.setTextColor(BLACK);
      lcd.fillRect(0, markerY, lcd.width(), MENU_ROW_HEIGHT, GREEN);
    }
    else {
      lcd.setTextColor(WHITE);
      lcd.fillRect(0, markerY, lcd.width(), MENU_ROW_HEIGHT, BLACK);
    }
    if (i >= MENU_LENGTH)
      continue;
    lcd.setCursor(3, markerY + 2);
    lcd.print((char*)pgm_read_word(&(menu[i])));
  }