Semtech LoRa Edge LR1110, User Manual

Page: 43 / 130

LR1110
User Manual
Rev.1.0
UM.LR1110.W.APP March 2020
43 of 130
Semtech
www.semtech.com
7.2.3 SetTx
The command SetTx( ) sets the sub-GHz radio in TX mode, triggering the RF packet transmission, and starting the RTC with
the given TxTimeout value.
If the RTC event fires before the end of transmission, it will trigger a TIMEOUT IRQ, and stop the device transmission.
Otherwise, at the end of the packet transmission, a TX_DONE interrupt is generated.
By default, the device goes back to STBY_RC mode after a TIMEOUT IRQ or a TX_DONE IRQ, or to STBY_XOSC or FS
depending on the
FallBackMode configuration.
•
TxTimeout is expressed in periods of the 32.768 kHz RTC. The maximum TxTimeout value corresponds to 512s.
0x000000 disables the timeout function.
If no packet type was configured, or the packet type does not allow Tx operations, the command will fail.
The busy pin will go to ‘0’ after the device is set into TX mode.
7.2.4 AutoTxRx
The command AutoTxRx( ) automatically performs the transition to RX mode after a packet transmission, or to TX mode after
a packet reception. After the second mode, the device goes back to Standby RC mode.
•
Delay defines the transition time between the TX and RX mode, expressed in periods of the 32.768kHz RTC. The
maximum Delay value corresponds to 512 s.

0x000000 performs a direct TX to RX or RX to TX transition, without going through the IntermediairyMode.

0xFFFFFF disables the AutoTxRx function. The AutoTxRx function is disabled by default.
• IntermediaryMode : device mode in between the TX and RX modes.

0x00: Sleep mode

0x01: Standby RC mode

0x02: Standby Xosc mode

0x03 FS mode
Table 7-3: SetTx Command
Byte 0 1 2 3 4
Data from Host 0x02 0x0A TxTimeout (23:16) TxTimeout (15:8) TxTimeout (7:0)
Data to Host Stat1 Stat2 IrqStatus(31:24) IrqStatus(23:16) IrqStatus(15:8)
Table 7-4: AutoTxRx Command
Byte 0 1 2 3 4 5 6 7 8
Data from Host 0x02 0x0C
Delay
(23:16)
Delay
(15:8) Delay
(7:0)
Intermediary
Mode
Timeout
(23:16)
Timeout
(15:8)
Timeout
(7:0)
Data to Host Stat1 Stat2
IrqStatus
(31:24)
IrqStatus
(23:16)
IrqStatus
(15:8)
IrqStatus
(7:0)
0x00 0x00 0x00