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Arduino Hello-World @ RIOT
Prints 'Hello Arduino!' once on the serial port during startup, toggles the
default LED twice each seconds and echoes incoming characters on the serial
// Per convention, RIOT defines a macro that is assigned the pin number of an
// on-board LED. If no LED is available, the pin number defaults to 0. For
// compatibility with the Arduino IDE, we also fall back to pin 0 here, if the
// RIOT macro is not available
#define ARDUINO_LED (0)
// Assign the default LED pin
int ledPin = ARDUINO_LED;
// input buffer for receiving chars on the serial port
int buf[64];
// counter that counts the number of received chars
int count = 0;
void setup(void)
// configure the LED pin to be output
pinMode(ledPin, OUTPUT);
// configure the first serial port to run with a baudrate of 115200
// say hello
Serial.println("Hello Arduino!");
void loop(void)
// toggle the LED
digitalWrite(ledPin, !digitalRead(ledPin));
// test if some chars were received
while (Serial.available() > 0) {
// read a single character
int tmp =;
// if we got a line end, we echo the buffer
if (tmp == '\n') {
// start with printing 'ECHO: '
Serial.write("Echo: ");
// echo the buffer
for (int i = 0; i < count; i++) {
// terminate the string with a newline
// reset the count variable
count = 0;
// else we just remember the incoming char
else {
buf[count++] = tmp;
// wait for half a second