Settx; Autotxrx; Table 7-3: Settx Command; Table 7-4: Autotxrx Command - Semtech LR1110 User Manual

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.

Table 7-3: SetTx Command

Byte
Data from Host
Data to Host
•
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.

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 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

LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
0 1
0x02 0x0A
Stat1 Stat2
1 2
Delay
0x0C
(23:16)
IrqStatus IrqStatus
Stat2
(31:24)
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2
TxTimeout (23:16)
IrqStatus(31:24)
3 4
Delay Delay Intermediary
(15:8) (7:0) Mode
IrqStatus IrqStatus
(23:16) (15:8)
3
TxTimeout (15:8) TxTimeout (7:0)
IrqStatus(23:16) IrqStatus(15:8)
5 6 7
Timeout Timeout
(23:16) (15:8)
0x00 0x00
(7:0)
4
8
Timeout
(7:0)
0x00
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