LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
50 of 130
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7.2.3 SetTx
Command SetTx(...) sets the sub-GHz radio or the HF radio in TX mode, triggering RF packet transmission, and starting
the RTC with the given TxTimeout value. There is no PA selection based on the RfFreq configuration. For details on PA choice
and operation refer to Section 9.
If the RTC event fires before the end of transmission, it triggers a TIMEOUT IRQ, and stops the transmission. Otherwise, at
the end of the packet transmission, a TX_DONE interrupt is generated.
After a TIMEOUT IRQ or TX_DONE IRQ, the device goes back to STBY_RC (default), STBY_XOSC or FS depending on the
FallBackMode configuration.
• TxTimeout is expressed in periods of the 32.768kHz RTC. The maximum value corresponds to 512 s.
0x000000 disables the timeout function.
If no packet type was configured, or the packet type does not allow Tx operations, the command fails.
The BUSY signal goes to 0 after the device is set into TX 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)
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