Usage Fault when implementing an advertiser sent callback.

RE: Usage Fault when implementing an advertiser sent callback.

SRall — Tue, 26 Nov 2024 14:00:32 GMT

Thank you, this was the issue.

RE: Usage Fault when implementing an advertiser sent callback.

Einar Thorsrud — Mon, 25 Nov 2024 09:49:06 GMT

Hi,

I was not able to reproduce at first, and seemingly unrelated changed seemed to affect it, pointing to usage of invalid memory. And that seems to be the case, as your adverticing advertising_cb struct is neither global nor static. And this will cause problems if the memory is re-used. The API docuemntation for bt_le_ext_adv_create() specifies that this callback truct parameters "Must point to valid memory during the lifetime of the advertising set". So making it static (or global) should solve the issue.

RE: Usage Fault when implementing an advertiser sent callback.

SRall — Thu, 21 Nov 2024 16:26:17 GMT

Sure. I've removed all the code apart from the bare application that just creates the advertising set and parameters and starts advertising. Connected and disconnected callbacks are setup as well. I still get the same error when the "sent" callback is triggered for any reason.

devzone.nordicsemi.com/.../3021.radio_5F00_test.zip

RE: Usage Fault when implementing an advertiser sent callback.

Einar Thorsrud — Thu, 21 Nov 2024 15:08:07 GMT

Hi,

I see. I am not able to explain that. Can you share the full project (including prj.conf and CMakeLists.txt etc) so that I can test on my end?

RE: Usage Fault when implementing an advertiser sent callback.

SRall — Wed, 20 Nov 2024 07:28:30 GMT

addr2line gives

C:/ncs/v2.7.0/zephyr/arch/arm/core/cortex_m/swap.c:49

It seems apparent that the advertising "sent" callback passed to the advertiser is causing the issue. If I don't pass any advertising callbacks, there is no issue. The error occurs when the callback is triggered, but despite my troubleshooting, I can't seem to figure out why. Perhaps you can take a look at my code and help me determine what might be happening. It's a simple BT peripheral application that advertises a simple service with one characteristic that closely follows the LED Button service sample.

RE: Usage Fault when implementing an advertiser sent callback.

Einar Thorsrud — Tue, 19 Nov 2024 08:18:08 GMT

I see. Can you check with addr2line where in the code this failed? You can do it like this (make sure to pint to the same .elf file that is running on the target, and replace the address to the address where it fails in the current build):

addr2line -e build/zephyr/zephyr.elf 0x000185e0

(See more on addr2line here)

RE: Usage Fault when implementing an advertiser sent callback.

SRall — Mon, 18 Nov 2024 15:28:35 GMT

Hi this didn't work. I set CONFIG_BT_RX_STACK_SIZE to 8192 and got the same error.

RE: Usage Fault when implementing an advertiser sent callback.

Einar Thorsrud — Mon, 18 Nov 2024 13:18:36 GMT

Hi,

The log indicate a stack overflow in the BT RX WQ thread. So incrase the stack size of that thread, set CONFIG_BT_RX_STACK_SIZE to a higher value in your prj.conf (for instance 4096).