nRF52 raw data from 2.4GHz transceiver

[rmarchand]

Hi there,

i'm wondering if it's possible to get access from the demodulator directly within the nRF52?  it shows in the block diagram below, is there any way to bypass the packet disassembler, CRC, and DeWhitening/Whitening?  i'd like to emit a constant tone for a duration of time and receive it as well on the RX side.  is it possible to bypass these internal blocks?  

there is a reference to the AoD and AoA sections there are references to being able to get the I/Q samples directly and i'd like to understand if that's something that is available potentially without the rest of the soft device being loaded.  

[Dmitry]

Do you want to receive constant tone as I/Q samples? Yes, you can configure DFE to record incoming signal directly from the radio (set DFEINEXTENSION to 0), but anyway, to start reception, the radio needs to match the signal against some address. Configure transmitter to send a packet consisting of just an address, then it will continue transmitting constant frequency (zero/one/center, as set in DTX bits) until DISABLE task.

[rmarchand]

Hi there, 

what i'm really looking to do is have the transmitter emit a constant tone for a duration of <128us and also receive simultaneously.  i think that given the ANT has a single connection this isn't feasible but i wanted to be sure.  I wanted to do a full duplex sort of communication.  is that feasible?

[Kenneth]

It's not possible to bypass the internal blocks, however there is a feature for direction finding that can send packets with continuous tone at the end of the packet, after the CRC:
https://infocenter.nordicsemi.com/topic/ps_nrf52833/radio.html#concept_dfe