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Please more information about "the" confirmed bug in Timeslot API

rgrr2

Hello

in the thread about NUS connection problems with TimeSync example ported to SDK16.0.0 Sigurd confirms a bug in the timeslot API.

Could you please be more specific about this one?  What is the actual effect/cause of the bug?  Any (effective) workaround?  Bugfix planned?

Background is, that we observe some Timeslot API "anomalies" as well and are wondering if those are triggered by a bug in the timeslot API.  See here

Thanks for any information

Hardy

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  • 0

    Hi,

    Background is, that we observe some Timeslot API "anomalies" as well and are wondering if those are triggered by a bug in the timeslot API

    Did you use S140 v6.1.1? If you test with S140 v6.1.0, and still see the "anomalies", then you have a different issue.

  • 0 in reply to Sigurd

    Hi Sigurd,

    thanks for the reply.  But to be honest: it does not make me happy because some important points are left unanswered.  E.g. what is the actual effect/cause of the bug and what are possible workaround.

    Trust me, we have spent a lot of time to get parallel protocols working and we are really interested in any assistance concerning is it "our" fault or "yours".  So a hint in the direction "this internal bug causes this and that behaviour and the workaround could be..." would be very helpful.

    Hardy

  • +1 in reply to rgrr2

    This scheduling bug was just recently discovered, it's still under investigation and not all details are fully known yet. What we know today is that a timeslot with NRF_RADIO_HFCLK_CFG_XTAL_GUARANTEED is causing the first packet sent by the master after CONNECT_IND packet to be sent a tiny bit too early, so that the slave misses this packet. (this is during BLE connection establishment). Both devices get a disconnect event with BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED. This is the only known effect of the bug today. If you read the other post, I have provided several potential workarounds. E.g. start the timeslot session after the BLE scanning is started, or e.g. use NRF_RADIO_HFCLK_CFG_NO_GUARANTEE + sd_clock_hfclk_request() instead. And yes, we will fix this bug in a future release.

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  • +1 in reply to rgrr2

    This scheduling bug was just recently discovered, it's still under investigation and not all details are fully known yet. What we know today is that a timeslot with NRF_RADIO_HFCLK_CFG_XTAL_GUARANTEED is causing the first packet sent by the master after CONNECT_IND packet to be sent a tiny bit too early, so that the slave misses this packet. (this is during BLE connection establishment). Both devices get a disconnect event with BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED. This is the only known effect of the bug today. If you read the other post, I have provided several potential workarounds. E.g. start the timeslot session after the BLE scanning is started, or e.g. use NRF_RADIO_HFCLK_CFG_NO_GUARANTEE + sd_clock_hfclk_request() instead. And yes, we will fix this bug in a future release.

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