Autotxrx; Table 7-4: Autotxrx Command - Semtech LR1121 User Manual

7.2.4 AutoTxRx

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.
If AutoTxRx mode is enabled, and a:
SetTx(...) command is sent to the device, the device goes to RX mode after TX_DONE and the given delay.
•
Timeout is used as the RxTimeout of the auto RX.
SetRx(...) command is sent to the chip, the chip goes to TX mode after RX_DONE and the given delay.
•
Timeout is used as the TxTimeout of the auto TX.
If an Rx Duty Cycle is started, this mode is not used.

Table 7-4: AutoTxRx Command

Byte 0
Data from Host 0x02
Data to Host Stat1
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 512s.
0x000000: Performs a direct TX to RX or RX to TX transition, without going through the IntermediaryMode.

0xFFFFFF: Disables the AutoTxRx function. The AutoTxRx function is disabled by default.

•
IntermediaryMode: device mode inbetween TX and RX modes.
0x00: Sleep mode.

0x01: Standby RC mode.

0x02: Standby Xosc mode.

0x03: FS mode.

•
Timeout defines the timeout of the second mode, after the automatic transition. It is expressed in periods of the
32.768kHz RTC. The maximum timeout value corresponds to 512s.
0x000000: Disables the timeout function.

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
1 2 3
Delay Delay
0x0C
(23:16) (15:8)
IrqStatus IrqStatus
Stat2
(31:24) (23:16)
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4 5
Delay Intermediary
(7:0) Mode
IrqStatus IrqStatus
(15:8) (7:0)
6 7 8
Timeout Timeout Timeout
(23:16) (15:8) (7:0)
0x00 0x00 0x00
51 of 130
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