G)Fsk Commands; Setmodulationparams; Table 8-13: Setmodulationparams Command; Table 8-14: Bandwidth Parameter - Semtech LR1121 User Manual

8.5 (G)FSK Commands

8.5.1 SetModulationParams

Command SetModulationParams(...) configures the modulation parameters for the selected modem. Since the
parameters are modem dependent, the description hereafter is valid only for the (G)FSK modem.

Table 8-13: SetModulationParams Command

Byte 0
Data from Host 0x02
Data to Host Stat1
• BitRate defines the (G)FSK bit rate in bits per second. It ranges from 600b/s to 300kb/s (default 4.8kb/s).
• PulseShape defines the filtering applied to the (G)FSK packet:
0x00: No filter applied

0x08: Gaussian BT 0.3

0x09: Gaussian BT 0.5

0x0A: Gaussian BT 0.7

0x0B: Gaussian BT 1.

• BWF defines the bandwidth.

Table 8-14: Bandwidth Parameter

BWF
0x1F
0x17
0x0F
0x1E
0x16
0x0E
0x1D
0x15
0x0D
0x1C
0x14
•
Fdev defines the frequency deviation (Hz)
LR1121
User Manual Rev 1.1
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1 2 3
Bitrate Bitrate
0x0F
(31:24) (23:16)
Irq Irq
Stat2 Status Status
(31:24) (23:16)
Description
RX_BW_4800 (4.8kHz DSB)
RX_BW_5800 (5.8kHz DSB)
RX_BW_7300 (7.3kHz DSB)
RX_BW_9700 (9.7kHz DSB)
RX_BW_11700 (11.7kHz DSB)
RX_BW_14600 (14.6kHz DSB)
RX_BW_19500 (19.5kHz DSB)
RX_BW_23400 (23.4kHz DSB)
RX_BW_29300 (29.3kHz DSB)
RX_BW_39000 (39kHz DSB)
RX_BW_46900 (46.9kHz DSB)
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4 5 6
Bitrate Bitrate Pulse
(15:8) (7:0) Shape
Irq Irq
Status Status 0x00
(15:8) (7:0)
BWF
0x0C
0x1B
0x13
0x0B
0x1A
0x12
0x0A
0x19
0x11
0x09
-
7 8 9
Fdev Fdev
BWF
(31:24) (23:16)
0x00 0x00 0x00
Description
RX_BW_58600 (58.6kHz DSB)
RX_BW_78200 (78.2kHz DSB)
RX_BW_93800 (93.8 Hz DSB)
RX_BW_117300 (117.3kHz DSB)
RX_BW_156200 (156.2kHz DSB)
RX_BW_187200 (187.2kHz DSB)
RX_BW_234300 (232.3kHz DSB)
RX_BW_312000 (312kHz DSB)
RX_BW_373600 (373.6kHz DSB)
RX_BW_467000 (467kHz DSB)
-
Proprietary & Confidential
10 11
Fdev Fdev
(15:8) (7:0)
0x00 0x00
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