Modems; Modem Configuration; Setpackettype; Figure 8-1: Lora® /(G)Fsk Command Order - Semtech LR1110 User Manual

8. Modems

8.1 Modem Configuration

The LR1110 contains different modems capable of handling different constant envelope modulations. The user shall then
specify the modem to be used by using the command SetPacketType( ) .
In a second step, SetModulationParam( ) configures the modem parameters (SF, BW, CR and LDRO), and SetPacketParam( )
defines the RF packet parameters (Payload length, Implicit/explicit mode, ...). Then the settings of the PA used for the RF
packet transmission shall be configured with the command SetPaConfig( ) (which PA, supply mode...), followed at last by
the PA parameters (output power, ramp time) using the command SetTxParams( ) .
The suitable command order is the following:

8.1.1 SetPacketType

The SetPacketType( ) command defines which modem is to be used.

Table 8-1: SetPacketType Command

Byte
Data from Host
Data to Host
•
PacketType defines the modem to be used for the next RF transactions.
0x00:None

0x01: (G)FSK

LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
SetPacketType
GFSK/LoRa
SetModulationParams
SF, BW, CR, LDRO, bitrate, fdev
SetPacketParams
PreambleLength, Implicit/Explicit,CRC, InvertIQ
SetPAConfig
PaSel, RegPaSupply, PaDutyCycle, PaHpSel
SetTxParams
Power, RampTime
Figure 8-1: LoRa® /(G)FSK Command Order
0
0x02
Stat1
www.semtech.com
1
0x0E
Stat2 IrqStatus (31:24)
2
PacketType
50 of 130
Semtech