Data Sheet

Page 107
RFM95/96/97/98(W)
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WIRELESS & SENSING PRELIMINARY DATASHEET
Name
(Address)
Bits
Variable Name
Mode Reset
LoRa
TM
Description
7-4 SpreadingFactor rw 0x07
SF rate (expressed as a base-2 logarithm)
6 Æ 64 chips / symbol
7 Æ 128 chips / symbol
8 Æ 256 chips / symbol
9 Æ 512 chips / symbol
10 Æ 1024 chips / symbol
11 Æ 2048 chips / symbol
12 Æ 4096 chips / symbol
other values reserved.
3 TxContinuousMode rw 0
0 Æ normal mode, a single packet is sent
1 Æ continuous mode, send multiple packets across the FIFO
(used for spectral analysis)
2 RxPayloadCrcOn rw 0x00
CRC Information extracted from the received packet header
0 Æ Header indicates CRC off
1 Æ Header indicates CRC on
RegModemConfig
2
(0x1E)
1-0 SymbTimeout(9:8) rw 0x00 RX Time-Out MSB
RegSymbTimeoutL
sb
(0x1F)
7-0 SymbTimeout(7:0) rw 0x64
RX Time-Out LSB
RX operation time-out value expressed as number of symbols:
TimeOut = SymbT imeout
· Ts
RegPreambleMsb
(0x20)
7-0 PreambleLength(15:8) rw 0x0
Preamble length MSB, = PreambleLength + 4.25 Symbols
See Section XX for more details.
RegPreambleLsb
(0x21)
7-0 PreambleLength(7:0) rw 0x8 Preamble Length LSB
RegPayloadLength
(0x22)
7-0
PayloadLength(7:0)
rw 0x1
Payload length in bytes. The register needs to be set in implicit
header mode for the expected packet length. A 0 value is not
permitted
RegMaxPayloadLe
ngth
(0x23)
7-0
PayloadMaxLength(7:0)
rw 0xff
Maximum payload length; if header payload length exceeds
value a header CRC error is generated. Allows filtering of packet
with a bad size.
RegHopPeriod
(0x24)
7-0
FreqHoppingPeriod(7:0)
rw 0x0
Symbol periods between frequency hops. (0 = disabled). 1st hop
always happen after the 1st header symbol
RegFifoRxByteAdd
r
(0x25)
7-0 FifoRxByteAddrPtr r n/a
Current value of RX databuffer pointer (address of last byte
written by Lora receiver)
7-4 Unused r 0x00
3
MobileNode rw 0x00 0 Æ Use for static node
1 Æ Use for mobile node
2
AgcAutoOn rw 0x00 0 Æ LNA gain set by register LnaGain
1 Æ LNA gain set by the internal AGC loop
RegModemConfig
3
(0x26)
1-0 Reserved rw 0x00 Reserved
(0x27) - (0x3F)
- Reserved r n/a Reserved