CRC 32 with Enhanced ShockBurst Radio

[atthorv]

Hi dear Nordic Team

I'am currently implementing a 802.15.4 compliant ShockBurst Radio TX/RX module on the NRF52811.
As far as I understand there is a crc 16 implemented  in the nrf_esb library but nothing further is this correct? 
If so what would be my options to use crc 32 with the nrf_esb library? Is there example code I could refer to for how to use crc 32 with the nrf_esb library?

Thank you in advance for your help.
Attila

[Kenneth]

The hardware support up to 24-bit by setting the NRF_RADIO->CRCCNF register to 3:
https://infocenter.nordicsemi.com/topic/ps_nrf52840/radio.html#register.CRCCNF

If you need longer CRC than this, then you would need to implement this in software, e.g. that the last 4bytes of the payload is a CRC calculated value that you need to manually calculate and verify on reception.

[atthorv]

Thank you Kenneth for your answer and clarification.