how to use Rx double buffer by example code


I have just downloaded the official examle code of dw1000.  when i test the "rx using buffering example code", in the deburg mode , i saw that program can not response to interrupt.  i have two board to test. One for Tx, the other for RX, both have the some dw_config_t config.   but in the example code of doublle buffering,  the rx board can not run into rx_ok_cb fuction. can anyone know this , i am puzzled by this double buffer? can you help me to practise this example code............?

thank u…