Can nrf_dm sample work with Zephyr Bluetooth Controller?

[jing]

Hello,

I have reconfigured the nrf_dm sample from ncs 2.0.0 to use Zephyr Bluetooth Controller by adding CONFIG_BT_LL_SW_SPLIT=y to proj.conf.

But then it's stuck in this "ASSERTION FAIL @ WEST_TOPDIR/zephyr/subsys/bluetooth/host/hci_core.c:309".

I wonder if it a must to use Softdevice Controller for Nordic Distance Measurement?

*** Booting Zephyr OS build v3.0.99-ncs1 ***
Starting Distance Measurement example
ASSERTION FAIL @ WEST_TOPDIR/zephyr/subsys/bluetooth/host/hci_core.c:309
E: r0/a1: 0x00000003 r1/a2: 0x00030b6c r2/a3: 0x00000001
E: r3/a4: 0x0002488d r12/ip: 0x00000000 r14/lr: 0x0000f467
E: xpsr: 0x41000000
E: s[ 0]: 0x00000000 s[ 1]: 0x00000000 s[ 2]: 0x00000000 s[ 3]: 0x00000000
E: s[ 4]: 0x00000000 s[ 5]: 0x00000000 s[ 6]: 0x00000000 s[ 7]: 0x00000000
E: s[ 8]: 0x00000000 s[ 9]: 0x00000000 s[10]: 0x00000000 s[11]: 0x00000000
E: s[12]: 0x00000000 s[13]: 0x00000000 s[14]: 0x00000000 s[15]: 0x00000000
E: fpscr: 0x00000000
E: Faulting instruction address (r15/pc): 0x0000f472
E: >>> ZEPHYR FATAL ERROR 3: Kernel oops on CPU 0
E: Current thread: 0x20004188 (unknown)
*** Booting Zephyr OS build v3.0.99-ncs1 ***
Starting Distance Measurement example

thanks 

jing

[Susheel Nuguru]

nrf_dm is nordic proprietary library and have been tested to work with Softdevice Controller. I do not think we tested it with Zephyr Bluetooth controller (so cannot say if it should work or not)

[jing]

Given that i am not able to get pass bt_enable() means nrf_dm wont work with zephyr bluetooth controller in this ncs 2.0.0.

I was trying to have both direction finding and distance measurement in a project. 

But direction finding samples are using the zephyr controller.  and I am getting ENOTSUP from calling bt_df_per_adv_sync_cte_rx_enable() in direction_funcing_connectionless_rx sample after rebuilding it to use Softdevice Controller.

So can I conclude that what i am trying to do is not achievable at the moment?

thanks

jing

[Susheel Nuguru]

you cannot use DM and Direction finding solutions together. If you these two features together then it is best that you use multiple antenna arrays to be able to triangulate and formulate the positioning. UBlox does offer this solution with nRF52833 and full software solution.

[jing]

i do have nordic's direction finding kit with the antenna array,

it's just that i am not able to merge both dm and df samples together as each depends on different le controller.

so it seems i can only wait for softdevice controller to fully support df functions... or when dm library is made compatible with zephyr controller.

jing

[Susheel Nuguru]

jing said:

so it seems i can only wait for softdevice controller to fully support df functions... or when dm library is made compatible with zephyr controller

yes, it seems so.