NRF52810-QCAA-R datasheet(286/483 Pages) NORDIC

286 / 483 page

Peripherals

in RAM will always be rounded up to the next full byte size (for instance 3 bit length will allocate 1 byte in

RAM, 9 bit length will allocate 2 bytes, etc.).

The sizes of the fields S0, LENGTH and S1 can be individually configured by the S0LEN, LFLEN and S1LEN

fields of the PCNF0 register respectively. The size of the payload is configured through the value in RAM

corresponding to the LENGTH field. The size of the static add-on to the payload is configured through the

STATLEN field in PCNF1 register.

The MAXLEN field in the PCNF1 register configures the maximum packet payload plus add-on size in

number of bytes that can be transmitted or received by the RADIO. This feature can be used to ensure that

the RADIO does not overwrite, or read beyond, the RAM assigned to the packet payload. This means that

if the packet payload length defined by the PCNF1.STATLEN and the LENGTH field in the packet specify a

packet larger than MAXLEN, the payload will be truncated at MAXLEN. The packet's LENGTH field will not

be altered when the payload is truncated. The RADIO will calculate CRC as if the packet length is equal to

MAXLEN.

Important: Note that MAXLEN includes the size of the payload and the add-on, but excludes the

size occupied by the fields S0, LENGTH and S1. This has to be taken into account when allocating

RAM.

6.14.2 Packet configuration

RADIO packet contains the following fields: PREAMBLE, ADDRESS, S0, LENGTH, S1, PAYLOAD and CRC.

The content of a RADIO packet is illustrated in On-air packet layout on page 286. The RADIO sends the

different fields in the packet in the order they are illustrated below, from left to right:

BASE

PREFIX

LENGTH

CRC

PAYLOAD

LSByte

MSByte

LSByte

ADDRESS

0x55

0xAA

PREAMBLE

Figure 58: On-air packet layout

PREAMBLE is sent with least significant bit first on-air. For all modes that can be specified in the MODE

Otherwise the PREAMBLE is set to 0x55.

Not shown in the figure above is the static payload add-on (the length of which is defined in

PCNF1.STATLEN, and which is 0 bytes long in a standard BLE packet). The static payload add-on is sent

between the PAYLOAD and CRC fields.

The RADIO packets are stored in memory, inside instances of a radio packet data structure as illustrated in

In-RAM representation of radio packet - S0, LENGTH and S1 are optional on page 286. The PREAMBLE,

ADDRESS and CRC fields are omitted in this data structure.

LENGTH

PAYLOAD

LSByte

Figure 59: In-RAM representation of radio packet - S0, LENGTH and S1 are optional

The byte ordering on the air is always:

4430_161 v1.0

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