RF69 datasheet(52/81 Pages) ETC2

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RF69

Page 51

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CONTROL

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

Data

SYNC

RECOG.

PACKET

HANDLER

FIFO

(+SR)

SPI

NSS

SCK

MOSI

MISO

Figure 32. Packet Mode Conceptual View

Note

The Bit Synchronizer is automatically enabled in Packet mode.

5.5.2. Packet Format

5.5.2.1. Fixed Length Packet Format

Fixed length packet format is selected when bit PacketFormat is set to 0 and PayloadLength is set to any value greater

than 0.

In applications where the packet length is fixed in advance, this mode of operation may be of interest to minimize RF

overhead (no length byte field is required). All nodes, whether Tx only, Rx only, or Tx/Rx should be programmed with the

same packet length value.

The length of the payload is limited to 255 bytes if AES is not enabled else the message is limited to 64 bytes (i.e. max 65

bytes payload if Address byte is enabled).

The length programmed in PayloadLength relates only to the payload which includes the message and the optional

address byte. In this mode, the payload must contain at least one byte, i.e. address or message byte.

An illustration of a fixed length packet is shown below. It contains the following fields:

 Preamble (1010...)

 Sync word (Network ID)

 Optional Address byte (Node ID)

 Message data

 Optional 2-bytes CRC checksum

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