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CCS/IWR1443: the RX chanel in vitalsigns demo

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Part Number:IWR1443

Tool/software: Code Composer Studio

Hi, I Have two questions as below

1.The vitalsigns demo show that the RX channel configuration is 15,meaning four recieve antennas are used,but I find that only one RX is used during range FFT precedure, which RX channel is choosed to do range FFT? I was intend to change,how shoud I do?

2. what does this code mean,  uint32_t *tempPtr = mmwRadarCube + (RX_CHANNEL_PROCESS_VITALSIGNS - 1);   only RX4 chanel is choosed ?


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