uint8_t buf[256] = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl";



  /*
   * Main loop, does nothing except spawn a shell when the old one was terminated
   */

  while (TRUE) {
    if (!shelltp && isUsbActive())
      {
        shelltp = shellCreate(&shell_cfg1, SHELL_WA_SIZE, NORMALPRIO);
        while(1){
            chSequentialStreamWrite(chp, buf, 256);
        }
      }
    else if (chThdTerminated(shelltp)) {
      chThdRelease(shelltp);    /* Recovers memory of the previous shell.   */
      shelltp = NULL;           /* Triggers spawning of a new shell.        */
    }
    chThdSleepMilliseconds(1000);
  }