// Xiao RP2040 Echo Program
// by Fabacademy instructor

#define bufsize 25
char buf[bufsize];
int count = 0;

void setup() {
  Serial.begin(9600); //must put in 9600 baudrate for the program to load into RP2040 successfully
}

void loop() {
  char chr;
  //
  // check for a char
  //
  if (Serial.available()) {
    //
    // read, save, and send char
    //
    chr = Serial.read();
    buf[count] = chr;
    count += 1;
    buf[count] = 0;
    if (count == (bufsize - 1))
      count = 0;
    Serial.print("hello.RP2040-XIAO.blink-echo.ino: you typed ");
    Serial.println(buf);
  }
}