RFM42 Datasheet, PDF (73/110 Pages) –

RFM42/43
Register 33h. Header Control 2
Bit
D7
D6
D5
D4
Name Reserved
hdlen[2:0]
Type
R
R/w
D3
fixpklen
R/w
D2
D1
synclen[1:0]
R/w
D0
prealen[8]
R/w
Reset value = 00100010
Bit
Name
Function
7
Reserved Reserved.
Header Length.
Length of header used if packet handler is enabled for TX (enpactx). Headers
are transmitted in descending order.
000: No TX header
6:4
hdlen[2:0]
001: Header 3
010: Header 3 and 2
011: Header 3 and 2 and 1
100: Header 3 and 2 and 1 and 0
Fix Packet Length.
3
fixpklen
When fixpklen = 1 the packet length (pklen[7:0]) is not included in the header.
When fixpklen = 0 the packet length is included in the header.
Synchronization Word Length.
The value in this register corresponds to the number of bytes used in the
Synchronization Word. The synchronization word bytes are transmitted in
descending order.
2:1
synclen[1:0]
00: Synchronization Word 3
01: Synchronization Word 3 and 2
10: Synchronization Word 3 and 2 and 1
11: Synchronization Word 3 and 2 and 1 and 0
MSB of Preamble Length.
0
prealen[8]
See register Preamble Length.
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