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

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
74 of 130
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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.
• 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.
• Fdev defines the frequency deviation (Hz)
Table 8-13: SetModulationParams Command
Byte 0 1 2 3 4 5 6 7 8 9 10 11
Data from Host 0x02 0x0F
Bitrate
(31:24)
Bitrate
(23:16)
Bitrate
(15:8)
Bitrate
(7:0)
Pulse
Shape
BWF
Fdev
(31:24)
Fdev
(23:16)
Fdev
(15:8)
Fdev
(7:0)
Data to Host Stat1 Stat2
Irq
Status
(31:24)
Irq
Status
(23:16)
Irq
Status
(15:8)
Irq
Status
(7:0)
0x00 0x00 0x00 0x00 0x00 0x00
Table 8-14: Bandwidth Parameter
BWF Description BWF Description
0x1F RX_BW_4800 (4.8kHz DSB) 0x0C RX_BW_58600 (58.6kHz DSB)
0x17 RX_BW_5800 (5.8kHz DSB) 0x1B RX_BW_78200 (78.2kHz DSB)
0x0F RX_BW_7300 (7.3kHz DSB) 0x13 RX_BW_93800 (93.8 Hz DSB)
0x1E RX_BW_9700 (9.7kHz DSB) 0x0B RX_BW_117300 (117.3kHz DSB)
0x16 RX_BW_11700 (11.7kHz DSB) 0x1A RX_BW_156200 (156.2kHz DSB)
0x0E RX_BW_14600 (14.6kHz DSB) 0x12 RX_BW_187200 (187.2kHz DSB)
0x1D RX_BW_19500 (19.5kHz DSB) 0x0A RX_BW_234300 (232.3kHz DSB)
0x15 RX_BW_23400 (23.4kHz DSB) 0x19 RX_BW_312000 (312kHz DSB)
0x0D RX_BW_29300 (29.3kHz DSB) 0x11 RX_BW_373600 (373.6kHz DSB)
0x1C RX_BW_39000 (39kHz DSB) 0x09 RX_BW_467000 (467kHz DSB)
0x14 RX_BW_46900 (46.9kHz DSB) - -