#include "LiquidCrystal_I2C.h"

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

int dataToSend = 123;
int counter = 0;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("  SPI Protocol Demo ");
  lcd.setCursor(0, 1);
  lcd.print("====================");
  lcd.setCursor(0, 2);
  lcd.print("  STM32 SPI Master  ");
  lcd.setCursor(0, 3);
  lcd.print("   Initializing...  ");
  delay(2000);
}

void loop() {
  counter++;
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("  SPI DEMO STM32    ");
  lcd.setCursor(0, 1);
  lcd.print("====================");
  lcd.setCursor(0, 2);
  lcd.print("Sending:  ");
  lcd.print(dataToSend);
  lcd.setCursor(0, 3);
  lcd.print("Count:    ");
  lcd.print(counter);
  Serial.print("SPI Sending: ");
  Serial.println(dataToSend);
  delay(1000);
}