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CC3235MODSF: CC3235 API to set 9 OFDM rates in 5GHz AP mode to support longer distance

Mark Kim
Prodigy 110 points

Part Number: CC3235MODSF
Other Parts Discussed in Thread: CC3235SF, , CC3235MODASF

We set CC3235SF to 5GHz AP mode with latest SDK and service pack, and running the data transmission test between AP and STA.

The data transmission in our product with the enclosure is normally working fine in 10M distance.

But at longer than 10M distance, the data transmission is hardly done. and at longer than 15M distance it is not done.

 

For these reasons, we want to reduce the data rate to 6 OFDM or 9 OFDM to support the long distance in 5GHz AP mode.

But we could not find out the right API to set 6/9 OFDM in AP mode 5GHz.

So, please advise me which API I need to use to set the data rate to 6/9 OFDM in 5GHz AP mode?

 

if there is no API to set the data rate to 9 OFDM,  then please advise me another way to set the data rate in AP mode?

 

Thanks 

  

 

  • 0
    Guru 80515 points

    Hi,

    There is no API for such purpose for AP mode. You will not be able configure this. Type of modulation is possible to set at transceiver mode only. At AP mode this is mandled by NWP automatically.

    Do you use own hardware or LaunchPad? DO you use CC3235MODSF or CC3235MODASF? Do you have properly optimised your antenna circuit (properly calculated and tested at VNA)?

    Jan

  • 0 in reply to Jan D
    Prodigy 110 points

    I am now running the test in our own hardware with the enclosure with both CC3235MODSF with external U.FL antenna and CC3235MODASF which is including PCB antenna.

    I also run the same test on CC3235 LaunchPad for the comparsion.

    in both cases, I have been observing the data transmission failure in longer distance like such as 12M.

    If there is no API, then is there any other way to set the data rate to 6/9 OFDM in AP mode?

  • 0 in reply to Mark Kim
    Guru 80515 points

    Hi,

    There is no way to set this at AP mode. Only way will be usage of transceiver mode and implementation of AP mode by yourself. Theoretically this is technically possible, but practically likely not possible due to complexity of such task.

    Just to be sure. Have you tested with latest Service Pack? If so and results of your hardware are same as LaunchPad, that you not left much options.

    Jan

  • 0 in reply to Jan D
    Prodigy 110 points

    Yes, I tested with SDK 7.10.00.13 and SP 4.13.0.2_3.7.0.1_3.1.0.26, which is the latest.

    I noticed that some other supplier support to set the data rate in AP mode.

    So wonder if TI has any plan to support to set the data rate in AP mode in soonest time frame?

  • +1 in reply to Mark Kim
    Guru 80515 points

    Hi,

    I am not TI employee from this reason I am not able answer this question. But because CC32xx devices are at LTS (long term support) stage, what means that TI have no plans add new features and fix bugs unless are critical security flaws. I would bet that you cannot expect implementation of such feature.

    btw... do you have set right country code and set TX power for max (=0) for AP mode?

    Jan

  • 0
    TI__Expert 4435 points

    Hi Mark,

    You can change the OFDM of the device using the radio tool. Feel free to look into this guide.

    Best,

    Brandon Liu

  • 0 in reply to Jan D
    Prodigy 110 points

    in 5GHz there is no TX power setting supported.  If there is no API to limit the data rate in AP mode, I will look at other way