#include <LiquidCrystal.h>

// LCD pin mapping
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

// Custom fast write function
void fastPrint(LiquidCrystal &lcd, const char *str, uint8_t col, uint8_t row) {
  lcd.setCursor(col, row);
  while(*str) {
    lcd.write(*str++);  // Using write() instead of print() avoids string overhead
  }
}

void setup() {
  Serial.begin(115200);
  lcd.begin(16, 2);
  
  // Warm-up display
  lcd.print("Initializing...");
  delay(100);
  lcd.clear();
}

void loop() {
  static uint8_t counter = 0;
  unsigned long start = micros();
  
  // Update display
  fastPrint(lcd, "Hello World!", 2, 0);
  fastPrint(lcd, "> Pi Pico <", 2, 1);
  
  // Show counter to verify updates
  lcd.setCursor(14, 0);
  lcd.write('0' + (counter++ % 10));
  
  unsigned long elapsed = micros() - start;
  Serial.print("Update time: ");
  Serial.print(elapsed);
  Serial.println(" µs");
  
  delay(1000);
}