Setgfskcrcparams; Setgfskwhitparams; Table 8-18: Setgfskcrcparams Command; Table 8-19: Setgfskwhitparams Command - Semtech LR1121 User Manual

8.5.5 SetGfskCrcParams

Command SetGfskCrcParams(...) configures the CRC polynomial and initial value, so they do not need to be
controlled manually.

Table 8-18: SetGfskCrcParams Command

Byte 0
Data from Host 0x02
Data to Host Stat1
•
InitValue: Initial value of the configured CRC polynomial (default 0x1D0F)
•
Poly: CRC polynomial (default Ox1021)
This flexibility permits the user to select any standard CRC or to use their own CRC, allowing a specific detection of a given
packet. Examples:
To use the IBM CRC configuration, the user must select:
•
0xFFFF for the initial value
•
0x8005 for the CRC polynomial
• and 0x02 (CRC_2_BYTE) for the field CrcType in command SetPacketParams(...)
For the CCITT CRC configuration the user must select:
•
0x1D0F for the initial value
•
0x1021 for the CRC polynomial
• and 0x06 (CRC_2_BYTE_INV) for the field CrcType in command SetPacketParams(...)

8.5.6 SetGfskWhitParams

Command SetGfskWhitParams(...) sets the whitening Seed:

Table 8-19: SetGfskWhitParams Command

Byte
Data from Host
Data to Host
•
Seed default value is 0x0100
LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
1 2 3
InitValue InitValue
0x24
(31:24) (23:16)
IrqStatus IrqStatus
Stat2
(31:24) (23:16)
0
0x02
Stat1
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4 5 6
InitValue InitValue Poly
(15:8) (7:0) (31:24)
IrqStatus IrqStatus
0x00
(15:8) (7:0)
1
0x025 Seed (15:8)
Stat2 IrqStatus (31:24)
7 8
Poly Poly
(23:16) (15:8)
0x00 0x00
2 3
Seed (7:0)
IrqStatus (23:16)
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9
Poly
(7:0)
0x00
77 of 130
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