NRF52810-QCAA-R datasheet(288/483 Pages) NORDIC

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Peripherals

Data in

Data out

Position

Figure 60: Data whitening and de-whitening

Whitening and de-whitening will be performed over the whole packet (except for the preamble and the

address field).

The linear feedback shift register, illustrated in Data whitening and de-whitening on page 288 can be

initialised via the DATAWHITEIV register.

6.14.6 CRC

The CRC generator in the RADIO calculates the CRC over the whole packet excluding the preamble. If

desirable, the address field can be excluded from the CRC calculation as well

See CRCCNF register for more information.

The CRC polynomial is configurable as illustrated in CRC generation of an n bit CRC on page 288 where

bit 0 in the CRCPOLY register corresponds to X0 and bit 1 corresponds to X1 etc. See CRCPOLY for more

information.

Packet

(Clocked in serially)

Xn-1

Figure 61: CRC generation of an n bit CRC

As illustrated in CRC generation of an n bit CRC on page 288, the CRC is calculated by feeding the

packet serially through the CRC generator. Before the packet is clocked through the CRC generator, the

CRC generator's latches b0 through bn will be initialized with a predefined value specified in the CRCINIT

the resulting CRC. This value will be used by the RADIO during both transmission and reception but it is

not available to be read by the CPU at any time. A received CRC can however be read by the CPU via the

RXCRC register independent of whether or not it has passed the CRC check.

The length (n) of the CRC is configurable, see CRCCNF for more information.

After the whole packet including the CRC has been received, the RADIO will generate a CRCOK event if no

CRC errors were detected, or alternatively generate a CRCERROR event if CRC errors were detected.

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NRF52810-QCAA-R bảng dữ liệu(PDF) 288 Page - Nordic Semiconductor