Texas Instruments CC13 Series, Application Report

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Measurement Results
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12 SWRA523B – September 2016 – Revised March 2017
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CC13xx Antenna Diversity
Figure 8. Antenna Diversity Test Board
4.3.2 Software Setup
For the board running the antenna diversity patch, we modified the rfPacketRx example as described in
Section 3 . In addition, a check was made in the callback function to determine on which antenna the
packet was received. This check was done by reading AntSelect from the 0x4004 5178 register (see
Table 4 ).
The following code was used to read the register and to track the number of packets that were received
on each antenna:
RF_Stat status = RF_runImmediateCmd(rfHandle, (uint32_t*)&RF_cmdReadRfRegAntenna);
if (((uint8_t)(RF_cmdReadRfRegAntenna.value)) & 0x01 )
{
a+;
}
else
{
a+;
}
// RF_cmdReadRfRegAntenna was configured as follows:
rfc_CMD_READ_RFREG_t RF_cmdReadRfRegAntenna =
{
.commandNo = 0x0601 ,
.address = 0x5178 ,
};
AntSelect is read instead of AntSelect0Cnt and AntSelect1Cnt because during testing, we were interested
only in the selected antenna for the packets we received ( AntSelect0Cnt and AntSelect1Cnt would include
antenna selection in cases where packets were discarded due to CRC errors).