Setcad; Setcadparams; Table 8-10: Setcad Command; Table 8-11: Setcadparams Command - Semtech LR1110 User Manual

In explicit header mode:
PayloadLen=0: reception of any payload length between 0 and 255 Bytes allowed.

PayloadLen= N: reception of any payload length between 1and N Bytes accepted. Payload lengths of 0 or > N are

rejected and result in a HeaderErr IRQ.
In implicit header mode, PayloadLen configures the exact length of the payload to be transmitted or received.
•
CRC defines if the CRC is OFF or ON:
0x00= CRC OFF

0x01= CRC ON

•
InvertIQ defines if the I and Q signals are inverted.
0x00= non inverted IQ

0x01= inverted IQ

This command will fail if no packet type has been set.

8.3.3 SetCad

The command SetCad( ) activates the CAD feature.

Table 8-10: SetCad Command

Byte
Data from Host
Data to Host

8.3.4 SetCadParams

The command SetCadParams( ) defines the LoRa® CAD parameters.

Table 8-11: SetCadParams Command

Byte 0
0x02
Data from
Host
Data to
Stat1
Host
•
SymbolNum defines the number of symbols used for the CAD detection
•
DetPeak and DetMin define the sensitivity of the LoRa® modem when trying to correlate to actual LoRa® preamble
symbols. These two settings depend on the LoRa® spreading factor and Bandwidth, but also depend on the number of
symbol used to validate or not the detection. Choosing the right value must be carefully tested to ensure a good
detection at sensitivity level, and also to limit the number of false detections.
Application note AN1200.48 provides guidance for the selection of the CAD parameters.
LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
0
0x02
Stat1
1 2
0x0D Symbol DetPeak
Num
IrqStatus IrqStatus
Stat2
(31:24) (23:16)
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1
0x18
Stat2
3 4 5
DetMin CadExit
Mode
IrqStatus IrqStatus
(15:8) (7:0)
6 7
Timeout Timeout Timeout
(23:16) (15:8)
0x00 0x00
8
(7:0)
0x00
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