// * Print a string to the TX pin of the Serial Port.
// * Blink the LED built into the Pico board.
// * Blink an external blue LED connected to GP22.
// * Author:  GoblinSailor     12/26/2022

//The blue LED is connected to GP22...
const int external_blue_led = 22;

void setup() {
  // put your setup code here, to run once:
  
  //The 1 means use the built in RS232 Serial TX pin.   Without the 1 you would
  //be operating like an arduino and trying to print over the USB port.
  Serial1.begin(115200);
  Serial1.println("Hello, Raspberry Pi Pico!  Blinking built in and external LEDs.");

  //Define two GPIO pins on the Pico board as outputs.
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(external_blue_led, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

  //Toggle both LEDs high (3.3V on pico) and low (0v)
  digitalWrite(LED_BUILTIN, HIGH);
  digitalWrite(external_blue_led, HIGH);
  delay(1000); // Delay for 1 second = 1000 milli-seconds

  digitalWrite(LED_BUILTIN, LOW);
  digitalWrite(external_blue_led, LOW);
  delay(1000); 
}