Ss_twr_responder with interrupt

Nice to meet you. I am a student in Japan. I am measuring the distance using DWM3000, and I am trying to implement the ss_twr_responder.c in the sample example using interrupt processing. However, I have a doubt that dwt_starttx(DWT_START_TX_DELAYED) does not work unless the delay response time is extremely long. Can someone please advise me on this?