Scan window is not working when i use BT_LE_SCAN_OPT_CODED option i

[hemakumar]

The scan window does not alternate properly with the BT_LE_SCAN_OPT_CODED option in the scan parameters. Specifically, the scan window does not toggle on and off every 30 ms as expected with a 30 ms scan window and a 60 ms scan interval. However, when using the BT_LE_SCAN_OPT_NONE option, the scan window operates correctly, toggling on and off every 30 ms as configured.

Is this an expected behaviour?? or is there a way to make it work as expected??

Reference image:

BT_LE_SCAN_OPT_NONE:

 

BT_LE_SCAN_OPT_CODED:

[Hung Bui]

Hi Hemakumas, 

Please tell which SDK version you are using. Please show the code that you do scanning. If you can provide a minimal example to reproduce the issue it would be nice. 

[hemakumar]

SDK version 2.6.0

Example program for the issue:

scan_window.zip

[Hung Bui]

Hi, 
I have reproduced the issue , seems that the CODED PHY take double the time of scan window. 
I will check internally and get back to you. 

[Hung Bui]

Update: It was because 1M and CODED PHY is both selected when you do BT_LE_SCAN_OPT_CODED . If you want to only do CODED PHY you should use : 

  .options = BT_LE_SCAN_OPT_CODED||BT_LE_SCAN_OPT_NO_1M,

 See the explanation here: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/softdevice_controller/doc/scheduling.html#primary_channel_scanner_timing

[hemakumar]

We want to enable scanning on both 1M and Coded PHY. Is this the expected behavior, or is there a way to reduce the scan window duration?