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CCS/CC2640R2F: Notifications do not come when scanning

Heinrich Hertz
Intellectual 760 points
Part Number: CC2640R2F

Tool/software: Code Composer Studio

Hi !

I used two CC2640R launchpads. 
One lunchpad (No. 1) is connected to another lunchpad (No. 2) and is subscribed to the notification. And when the lunchpad (No. 1) begins to periodically scan, notifications from another do not come. If you do not scan, then all the data from the lunchpad (№2) come. But I need the lunchpad (No. 1) to periodically scan.

What could be the reason?

What will you advice me?

  • 0
    TI__Guru* 81461 points
    Hi Heinrich,

    What version of the SimpleLink CC2640R2 SDK are you using?

    Can you post a sniffer log of this happening?

    What are the connection parameters (connection interval, slave latency) and scanning parameters (duration, interval, window)?
  • 0 in reply to Marie H
    Intellectual 760 points
    Hi Marie,

    I am using SDK version 2.40.00.32.
    Connection parameters: connection interval = 200, slave latency = 0.
    Scanning parameters: duration = 500, window = 80, interval = 80.

    I do not have a sniffer, so I check through the debugger.
  • 0 in reply to Heinrich Hertz
    TI__Guru* 81461 points
    Hi Heinrich,

    So launchpad No 1 is connected with 200 ms connection interval, and simultaneously scans with duration 500 ms... This isn't going to work.... Every 200 ms the scan will be interrupted for the connection interval. I would recommend setting a scan duration that fits between the connection events.

    You can try to use RF pins to investigate further if you have a logic analyzer (see the Technical reference manual section 11.3.3 Control External LNA/PA (Range Extender) With I/Os, link: http://www.ti.com/lit/swcu117 ).

    Can you check whether the connection is broken/times out when this happens? If not, the noti packets should be retransmitted even if the device is missing a few connection events.
  • 0 in reply to Marie H
    Intellectual 760 points
    Thanks for your reply. I solved my problem.