ST STM32WL55JC

Sub-GHz radio (SUBGHZ) RM0453
186/1454 RM0453 Rev 2
The correct values selected in the table below must be carefully tested to ensure a good
detection at sensitivity level and to limit the number of false detections.
Set_BufferBaseAddress() command
Set_BufferBaseAddress(TxBaseAddr, RxBaseAddr) sets the data buffer base
address for the packet handling in TX and RX.
byte 4 bits 7:1 Reserved, must be kept at reset value.
Bit 0 CadExitMode: defines the sub-GHz radio operating mode to enter after CAD
scan is finished
0: Standby with RC 13 MHz mode entry after CAD, whatever is detected
during the CAD scan
1: Standby with RC 13 MHz mode after CAD if no LoRa symbol is detected
during the CAD scan
if a LoRa symbol is detected, the sub-GHz radio stays in Receive mode until a
packet is received or until the CAD timeout is reached.
bytes 7:5 bits 23:0 Timeout[23:0]: CAD timeout = Timeout[23:0] x 15.625 μs
The CAD timeout is only used when a symbol is detected and
CadExitMode = 1 (stay in Receive mode after a LoRa symbol detection).
0x000000 - 0xFFFFFF: timeout, resolution 15.625 μs
Table 36. Recommended CAD configuration settings
SF CadDetPeak[7:0] CadDetMin[7:0]
5 0x18 0x10
6 0x19 0x10
7 0x20 0x10
8 0x21 0x10
9 0x22 0x10
10 0x23 0x10
11 0x24 0x10
12 0x25 0x10
012
Opcode TxBaseAddr[7:0] RxBaseAddr[7:0]
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byte 0 bits 7:0 Opcode: 0x8F
byte 1 bits 7:0 TxBaseAddr[7:0]: Tx base address offset relative to the sub-GHz RAM base
address
byte 2 bits 7:0 RxBaseAddr[7:0]: Rx base address offset relative to the sub-GHz RAM base
address