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CCS/CC2640R2F: TI CC2640r2f evaluation board using questions

QI Jepson
Intellectual 320 points
Part Number: CC2640R2F

Tool/software: Code Composer Studio

1. When using the TI development board to run the AOA reciver program in simplelink_cc2640r2_sdk_2_30_00_28. It is found that the data structure of the sender must be sent as follows. The TI company ID and AOApacketID marked in red can only be placed at this location, otherwise the AOA program cannot be correctly identified.

13

adv0

0x1E

adv Len

14

adv1

0xFF

15

adv2

0x0D

TI companyID

16bit

16

adv3

0x00

17

adv4

0x04

AoA packetID

8bit

18

adv5

0x00

padding

6 bytes

19

adv6

0x00

20

adv7

0x00

21

adv8

0x00

22

adv9

0x00

23

adv10

0x00

24

adv11

0xFF

DF signals

20 bytes

25

adv12

0xFF

begin at (1+4+6)byte

Is it possible to adjust these three bytes to other locations?

2.The IQ value collected by the same antenna at the same location fluctuates greatly. What caused it? When the antenna is switched, the IQ value changes very slowly. Does TI do the corresponding filtering?

3.In the AOA reciver program in the SDK, when changing the whitening configuration in the AOA.c file, it is found that the highest bit bOverride bit in this byte cannot be set to 1 when writing .whitening=128.

  • 0
    TI__Genius 9215 points
    Dear Jepson,

    1. No, the location of these bytes are fixed.
    2. The IQ values are a capture of a 250 KHz tone (at 4 Msps) so the values will naturally change. If you convert the IQ sample to polar coordinates you will see that the phase changes constantly when you do not switch antenna. You can also plot the IQ values and then you will see a sinus with a period of approximately 250 KHz (16 IQ samples at 4 Msps). Does this explains the fluctuation you see? Or are you talking about AoA were you measure phase difference between IQ samples taken on different antennas?
    3. I'm not sure what you are trying to do here?

    Best Regards,
    R.M
  • 0 in reply to R.M
    TI__Genius 9215 points
    Dear Jepson,

    I haven’t heard from you for almost two weeks so I’m assuming you were able to resolve your issue. If this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information. If this thread locks, please click the "Ask a related question" button and in the new thread describe the current status of your issue and any additional details you may have to assist us in helping to solve your issues.

    Regards,
    R.M