File content as of revision 0:9781dfcab99c:

#include "mbed.h"

DigitalOut myled(LED1);

char *morse_pattern[] = {
  "._", "_...", "_._.", "_..", ".", ".._.", "__.",
  "....", "..", ".___", "_._", "._..", "__",
  "_.", "___", ".__.", "__._", "._.", "...", "_",
  ".._", "..._", ".__", "_.._", "__._", "__.."
};

void morse(float time, char *str) {
  int i, j;

  for (i=0; i<strlen(str); i++) {
    char *c = str+i;
    if ('A' <= *c && *c <= 'Z') {
      char *pattern = morse_pattern[*c - 'A'];
      for (j=0; j<strlen(pattern); j++) {
        myled = 1;
        if(pattern[j] == '.') {
          wait(time * 1);
        } 
        else {
          wait(time * 3);
        }
        myled = 0;
        wait(time * 1);
      }
      wait(time * 2);
    } else {
      wait(time * 3);
    }
  }
  wait(time * 4);
}

int main() {
    char *str = "HELLO WORLD";
    
    while(1) {
        morse(0.1, str);
    }
}