RE: Bitcounter raising BCMATCH event for short packets

Håkon Alseth — Tue, 28 Apr 2026 09:21:03 GMT

Hi,

[quote user=""]

My question is - if the received packet is shorter than the configured BCC value, will the bcmatch event not be asserted?

For example, if i configure NRF_RADIO->BCC = 96, and a packet arrives with 9 bytes after the access adress (72 bits), will the bcmatch event not be triggered at all?

[/quote]

This highly depend on when you start the bitcounter, but it must be started after the EVENTS_ADDRESS has occurred.

If you start it on EVENTS_ADDRESS, it will start from the address match and going forward for the amount of configured bits.

For more detailed information related to the bit counter, see here:

https://docs.nordicsemi.com/bundle/ps_nrf52840/page/radio.html#ariaid-title12

[quote user=""]For example, if i configure NRF_RADIO->BCC = 96, and a packet arrives with 9 bytes after the access adress (72 bits), will the bcmatch event not be triggered at all?[/quote]

At this time, the demodulator will continue to demodulate data, but you can get a corrupt/invalid payload at the end.

If you get a address match, and a device address match, you will receive more data; as the validity of the payload is depending on the CRC.

Kind regards,

Håkon