BLE Sounding not working on xiao nrf54l15

[Muba2520]

I have downloaded the nrf SDK v3.2.1 and i am testing its BLE sounding reflector and initiator sample code on two different xiao boards here is what i am getting at the serial monitor

I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.74, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.71, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.71, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.71, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.72, phase_slope: 1.75, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.73, phase_slope: 1.78, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.73, phase_slope: 1.75, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.70, phase_slope: 1.73, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.73, phase_slope: 1.75, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.73, phase_slope: 1.76, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.73, phase_slope: 1.76, rtt: 0.00 meters
I: Latest distance estimates on antenna path 0: ifft: 1.73, phase_slope: 1.76, rtt: 0.00 meters


On the reflector side i dont have any prints.
My question is why am i getting the RTT as 0 ? is there any extra configuration which we need to do

I have followed setting up the xiao nrf from its getting started page 
here is the link of it
wiki.seeedstudio.com/.../

[Muba2520]

Hi Ressa, 

I have successfully uploaded the BLE CS code on my xiao nrf54l15, just wanted to ask that many times i keep getting this error when i upload the code on my xiao and it is the case with both the reflector as well as initiator

[00:00:42.368,367] <err> os: ***** MPU FAULT *****
[00:00:42.373,725] <err> os: Data Access Violation
[00:00:42.379,325] <err> os: MMFAR Address: 0x3000d
[00:00:42.385,023] <err> os: r0/a1: 0x200096e8 r1/a2: 0x00000001 r2/a3: 0xba2e8ba3
[00:00:42.393,631] <err> os: r3/a4: 0x00000008 r12/ip: 0x00000000 r14/lr: 0x000243b9
[00:00:42.402,240] <err> os: xpsr: 0x01000000
[00:00:42.407,425] <err> os: s[ 0]: 0x00000000 s[ 1]: 0x00000000 s[ 2]: 0x00000000 s[ 3]: 0x00000102
[00:00:42.417,762] <err> os: s[ 4]: 0x20006a78 s[ 5]: 0x20007406 s[ 6]: 0x00000000 s[ 7]: 0x20006a9c
[00:00:42.428,101] <err> os: s[ 8]: 0x00000040 s[ 9]: 0x00000000 s[10]: 0x00000008 s[11]: 0x0002483d
[00:00:42.438,440] <err> os: s[12]: 0x20007406 s[13]: 0x0002f563 s[14]: 0x00000000 s[15]: 0x00032c89
[00:00:42.448,763] <err> os: fpscr: 0x000325e0
[00:00:42.453,936] <err> os: Faulting instruction address (r15/pc): 0x0002444c
[00:00:42.461,778] <err> os: >>> ZEPHYR FATAL ERROR 19: Unknown error on CPU 0
[00:00:42.469,613] <err> os: Current thread: 0x20004950 (unknown)
[00:00:42.476,331] <err> os: Halting system

what is this error and why do i keep getting, another thing is that it doesnt come everytime.
and for this compilation i have just changed this line in the code

.cs_sync_antenna_selection = BT_LE_CS_ANTENNA_SELECTION_OPT_NO_RECOMMENDATION,

[Ressa]

Hi Muba,

The line that you are changing does not seem to do anything compared to default setting to me. My understanding is that without the change it works fine. If so then why not removing the line.
You can also use addr2line tool for debugging: Build errors and fatal errors - Nordic Developer Academy