ao_xmemset(&ao_config.callsign, '\0', sizeof (ao_config.callsign));
ao_xmemcpy(&ao_config.callsign, CODE_TO_XDATA(AO_CONFIG_DEFAULT_CALLSIGN),
sizeof(AO_CONFIG_DEFAULT_CALLSIGN) - 1);
ao_xmemset(&ao_config.callsign, '\0', sizeof (ao_config.callsign));
ao_xmemcpy(&ao_config.callsign, CODE_TO_XDATA(AO_CONFIG_DEFAULT_CALLSIGN),
sizeof(AO_CONFIG_DEFAULT_CALLSIGN) - 1);