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CC2652P: 2.4GHz Proprietary Mode Using DSSS=8 and LRM

lingfeng cai
Prodigy 30 points
Part Number: CC2652P
Other Parts Discussed in Thread: CC1352P

Hi,

I wish to try implementing spread spectrum and long-range mode under a private protocol, and test sensitivity. Specifically, this means achieving DSSS=8, FEC = 1/2, LRM, using 2-FSK modulation. However, after searching through forums and technical documents, I am unsure how to achieve this in smartrf by adjusting values and override settings, especially for the configuration of DSSS, as there are many different opinions. For instance, I'm not certain if using HW_REG_OVERRIDE(0x5068,0x030C) actually activates DSSS. Could you please provide me with a detailed set of instructions so I can implement the aforementioned mode? And what is the proper register value for different DSSS under CC2652P?

Another question is, when I using CC1352P launchpad to test WB-DSSS mode, the tested sensitivity using attenuator is -115 but datasheet shows -121, I'm wondering how did you test sensitivity, which result is more convencing?

  • 0
    Prodigy 30 points

    I know some of mode in 2.4GHz is not characterized, but I just want to activate them to test the sensitivity.

  • 0 in reply to lingfeng cai
    TI__Mastermind 36670 points

    Hello E2E community member,

    Thanks you for asking your question concerning TI's SimpleLink Devices on the E2E Forum! The subject expert who can best address your inquiry is out of office for the holidays. After returning in early January, they will review your post and provide an initial response within 24 hours.

    To ensure quick and efficient resolution of your problem, please make sure you have provided all relevant information related to your request. This may include: SimpleLink SDK version and its dependencies, hardware used, examples being referenced, and steps to reproduce the issue. Please also provide any debug information, screenshots, code snippets, or terminal logs which may help further identify the issue.

    Regards,
    Jan

  • 0
    TI__Mastermind 32370 points

    Hi,

    lingfeng cai said:
    Could you please provide me with a detailed set of instructions so I can implement the aforementioned mode? And what is the proper register value for different DSSS under CC2652P?

    At the moment this is unavailable. I'll check with internal team for more details.

    lingfeng cai said:
    Another question is, when I using CC1352P launchpad to test WB-DSSS mode, the tested sensitivity using attenuator is -115 but datasheet shows -121, I'm wondering how did you test sensitivity, which result is more convencing?

    This is probably related to HW test setup. Numbers in the datasheet are measured with this HW: CC1352PEM-XD7793-XD24-PA9093

    Since you are testing with different HW, you may get different results. If more details are needed here, I recommend creating a new E2E post for that topic specifically.

    Thanks,
    Toby

  • 0
    TI__Mastermind 32370 points
    lingfeng cai said:
    I wish to try implementing spread spectrum and long-range mode under a private protocol, and test sensitivity.

    When you say "long-range mode" here, do you mean "SimpleLink Long Range Mode" (2.5 or 5 kbps datarate) or "WB-DSSS" (10s of kbps datarate)?

    lingfeng cai said:
    Specifically, this means achieving DSSS=8, FEC = 1/2, LRM, using 2-FSK modulation.

    Based on DSSS=8, it seems you might be looking for WB-DSSS, since that is the one available here:

    Please confirm.