//
// Seeed XIAO RP2040 button, blink, echo hello-world
//
// based on code by Neil Gershenfeld
//
//#define allows the programmer to give a name to a constant value before the program is compiled
#define B_button_pin D1
#define B_led_pin D9
#define R_button_pin D2
#define R_led_pin D7

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pins for LEDS as an output and buttons as INPUTS
  pinMode(B_led_pin, OUTPUT);
  pinMode(B_button_pin,INPUT_PULLUP);
  pinMode(R_led_pin, OUTPUT);
  pinMode(R_button_pin,INPUT_PULLUP);
  Serial.begin(9600);  // opens serial port, sets data rate to 9600 bps
  //Serial.setTimeout(10); //sets the maximum milliseconds to wait for serial data
  Serial.println("Input B to turn blue LED and R to turn red LED");
}
  bool B_button_up =true; //bool holds one of two values, true or false
  bool R_button_up =true;

// the loop function runs over and over again forever
void loop() {
    if (Serial.available()) {
          char comdata = char(Serial.read());
      if (comdata == 'B') {
        digitalWrite(B_led_pin,HIGH);
        Serial.print("you typed:");
        Serial.println(comdata);
        delay(500);
        digitalWrite(B_led_pin,LOW);
      }
      else if (comdata == 'R') {
        digitalWrite(R_led_pin,HIGH);
        Serial.print("you typed:");
        Serial.println(comdata);
        delay(500);
        digitalWrite(R_led_pin,LOW);
      }
  }
    // Check Blue Button
  if ((digitalRead(B_button_pin) == LOW) && B_button_up) {
      digitalWrite(B_led_pin,HIGH);
      Serial.println("blue button down");
      B_button_up = false;
      }
  if ((digitalRead(B_button_pin) == HIGH) && !B_button_up) {
        digitalWrite(B_led_pin,LOW);
        Serial.println("blue button up");
        B_button_up = true;
       }

  // Check Red Button
  if ((digitalRead(R_button_pin) == LOW) && R_button_up) {
      digitalWrite(R_led_pin,HIGH);
      Serial.println("red button down");
      R_button_up = false;
      }
  if ((digitalRead(R_button_pin) == HIGH) && !R_button_up) {
        digitalWrite(R_led_pin,LOW);
        Serial.println("red button up");
        R_button_up = true;
       }
    delay(50);
   }