Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1499

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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.
When starting, 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 LSBs 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
32767.
• 3: PRBS-31: The polynomial x
length 4294967295.
For whitening modes 2 and 3, initialization is done by the radio CPU writing 0xAAAA 0000 to the PRBS
value register before transmission starts. For whitening mode 1, the default initialization is used.
The transmitter runs until the trigger set up by endTrigger and endTime (see
until an abort command is issued.
If pktConfig.bFsOn is 1, the synthesizer is turned off (corresponding to CMD_FS_OFF; see
Section 23.3.3.1.6) after the operation is done; otherwise it is left on.
The operation ends by one of the causes listed in
The command structure for CMD_TX_TEST contains the fields listed in
Byte Index Field Name
14 config
15
16–17 txWord
18
19 endTrigger
20–23 syncWord
24–27 endTime
SWCU117C – February 2015 – Revised September 2015
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15 14
+ x + 1 is used. This gives a pseudo-noise sequence with length
32 22 2
+ x + x + x + 1 is used. This gives a pseudo-noise sequence with
Table
Table 23-26. CMD_TX_TEST Command Format
Bits Bit Field Name
0 bUseCw
1 bFsOff
2–3 whitenMode
Copyright © 2015, Texas Instruments Incorporated
Section
23-14.
Table 23-26.
Type Description
0: Send modulated signal.
W
1: Send continuous wave.
0: Keep frequency synthesizer on after
command.
W
1: Turn frequency synthesizer off after
command.
0: No whitening
1: Default whitening
W
2: PRBS-15
3: PRBS-32
Reserved
Value to send to the modem before
W
whitening
Reserved
W Trigger classifier for ending the operation
W Sync word to use for transmitter
W Time to end the operation
RF Core HAL
23.3.2.5.1) occurs, or
1499
Radio