static void puttxt(char *text) {


  static uint8_t txbufferwritepos;
  char * tp1, *tp2;

  tp1 = text;
  tp2 = txbuffer+txbufferwritepos;

  cli();
  sei();

  while(*tp1) {
    *(tp2++) = *(tp1++);
    charsleftintxbuffer++;
    txbufferwritepos++;
    if (txbufferwritepos == TX_BUF_SIZE) { tp2 = txbufferwritepos; }
  }

  UCSR0B |= (1 << UDRIE0);

  return;
}