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Sub-GHz radio (SUBGHZ) RM0453

192/1454 RM0453 Rev 2

BPSK Set_PacketParams() command

Set_PacketParams(PayloadLength) is used to configure the packet handling for the

sub-GHz radio. When the BPSK packet is selected with packet type in

Set_PacketType() sent prior to this function, the parameters are interpreted as below.

LoRa Set_LoRaSymbTimeout() command

Set_LoRaSymbTimeout(SymbNum) is used to configure the number of LoRa symbols to

be received before starting the reception of a LoRa packet.

Note: In LoRa packet type, when entering the Receive mode and SymbNum[7:0] = 0x0, the

modem locks as soon as a single LoRa symbol is detected. This may lead to a false

detection. To avoid false detections, the number of LoRa symbols to be detected can be

increased.

byte 5 bits 7:1 Reserved, must be kept at reset value.

bit 0 CrcType CRC enable

0: CRC disabled

1: CRC enabled

byte 6 bits 7:1 Reserved, must be kept at reset value.

bit 0 InvertIQ: IQ setup

0: standard IQ setup

1: inverted IQ setup

Opcode PayloadLength[7:0]

byte 0 bits 7:0 Opcode: 0x8C.

byte 1 bits 7:0 PayloadLength[7:0]: BPSK packet (payload) length, including preamble, synch

word, device id and CRC, in number of bytes

0x00- 0xFF: 0 to 255 bytes

Opcode SymbNum[7:0]

byte 0 bits 7:0 Opcode: 0xA0.

byte 1 bits 7:0 SymbNum[7:0]: Number of LoRa symbols to be detected before starting a

LoRa packet reception

Packet reception starts after N+1 LoRa symbols are detected.

0x0: packet reception started when a single LoRa symbol is detected

Others: packet reception started when N+1 LoRa symbols are detected. The

sub-GHz radio waits for the total number of LoRa symbols. When the receive

chain is not locked at this time, a receiver timeout IRQ is generated.

ST STM32WL55JC User Manual

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