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A trigger to end the operation is set up by endTrigger and endTime (see Section 23.3.2.5.1, Triggers). If
the trigger that is defined by this parameter occurs, the radio operation ends.
The operation ends by one of the causes listed in Table 23-13.
The command structure for CMD_RX_TEST contains the fields listed in Table 23-24.
Table 23-24. CMD_RX_TEST Command Format
Byte Field
Bytes Bits Bit Field Name Type Description
Name
0 Reserved W Set to 0
0: Keep frequency synth on after command
1 bFsOff W
1: Turn frequency synth off after command
14 config
0: Run sync search as normal for the configured mode
2 bNoSync W 1: Write correlation thresholds to the maximum value to
avoid getting sync
15 endTrigger W Trigger classifier for ending the operation
16–19 syncWord W Sync word to use for receiver
20–23 endTime W Time to end the operation
23.3.3.1.8 CMD_TX_TEST: Transmitter Test Command
Command ID number: 0x0808
CMD_TX_TEST is a radio operation command used to set the receiver in infinite TX mode and transmit
either a CW or modulated data for test purposes.
On start, the radio CPU starts the transmitter. The radio must be configured using CMD_RADIO_SETUP,
and the frequency synthesizer must already be started using CMD_FS. The radio transmits a preamble
and a sync word of the size given by the current radio configuration, specified using
CMD_RADIO_SETUP. The sync word is given in the least significant bits of syncWord. The payload after
the sync word consists of the 16-bit word TXWord, repeated indefinitely. This word may be run through
whitening, with the options given in config.whitenMode, which can take the following values:
• 0: No whitening is used. This is useful for testing with a repeated pattern, but gives spurs if used for
spectral measurements.
• 1: Default whitening. This means that the whitening is as configured for the mode in use (potentially
with overrides). If the mode does not use whitening, no whitening is applied.
• 2: PRBS-15: The polynomial x
15
+ x
14
+ 1 is used. This gives a pseudo-noise sequence with length
32767.
• 3: PRBS-31: The polynomial x
32
+ x
22
+ x
2
+ x + 1 is used. This gives a pseudo-noise sequence with
length 4294967295.
1476
Radio SWCU117A–February 2015–Revised March 2015
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