USB CDC sample fault with CONFIG_NO_OPTIMIZATIONS=y

[denis]

On a nRF5340 DK the sample ncs/zephyr/samples/subsys/usb/cdc_acm runs fine.  However, if I add "CONFIG_NO_OPTIMIZATIONS=y" to prj.conf I get faults (see below).  Any ideas why that would be?

I'm turning off optimizations so it is easier to debug in SES.  Is this the right way to go about that?

[Simon]

Try setting CONFIG_USB_NRFX_WORK_QUEUE_STACK_SIZE=4096.

Best regards,

Simon

[denis]

That seems to have done the trick.  Is there some documentation on the architecture of various subsystems, such as usb and ble, that talks about the threads required, etc?

[Simon]

I tried to search around in http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/, but couldn't find anything like this unfortunately.

[Simon]

Check out this: http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/app_memory.html

You can tune the stack sizes with Thread analyzer and puncover.