static void WriteDisplayString( const char * aString ) {
    ResetDisplayPointer();
    while ( *aString ) WriteLedDisplayChar( *(aString++) );
}

static void ClearLedDisplay() {
   unsigned char ix;
   ResetDisplayPointer();
   for (ix=0; ix < DISPLAY_LENGTH; ix++ ) {
        WriteLedDisplayChar( INVISIBLE_CHAR );
   }

}

extern void main() {
    ClearLedDisplay();
    WriteLedDisplayString( "WHOAA" );
}