main.cpp

#include "mbed.h"

int main() {

  // put your setup code here, to run once:
  //Setup the LED1 pin to be a digital output called ledOne
  DigitalOut ledOne(LED1);

  while(1) {
    // put your main code here, to run repeatedly:

    printf("Loop\n");
    ledOne = 1;
    //wait_ms(1000);  //MBED OS 6 has deprecated wait / wait_ms
    // Therefore use sleep_for 
    ThisThread::sleep_for(1000ms);
    ledOne = 0;
    
    // We can still use wait_ns though
    ThisThread::sleep_for(2000ms);
  }
}