52840dk Segger debug exception when using softdevices.

[pkoenig]

Debugging in Segger serial example from mesh

It runs and responds to commands, but when paused or hits breakpoint - single step or continue gets to address 0xa60, continue logs the message:

app_error_weak.c,   96, Softdevice assert: 154516:0

Are there some required debugger setting whne debugging with softdevices?

I was debugging sample project without the softdevice without problems - possibly there is another issue.

[pkoenig]

OK, case closed, understand.

But it looks to me like there is a silicon issue, related to the debugger RTL.

Could you tell me, if this is described somewhere in the docs?

Piotr

[Edvin]

What issue do you refer to? And what debugger do you use? Is it the nRF52840 DK?

[pkoenig]

The issue of the JTAG debugger stopping at 0xa60 after continue from suspend or breakpoint.

It happens on both 840dk, and 832dk. I agree with you that it is caused by not serviced event in the soft device.

I am using segger, but the gui does not matter, this is in the rtl of the debugger on silicon.

But if you say, this is a normal operation procedure, to restart the app after each breakpoint, probably this has to be like that. I need to implement some realtime debugging support through the UART or sth like that.

Piotr

[Edvin]

It is not a debug error. It is the hardfault handler for the nRF caused by the softdevice missing the events. There is a logging module in the SDK which is a handy tool. You see a lot of the NRF_LOG_INFO. Depending on whether you use the RTT or the UART backend (selected in sdk_config.h) it will be output on either the RTT or the UART.

If you are using Segger Embedded Studio (SES), I can recommend using the RTT backend, and it will show when you are debugging. If you are using SES and RTT, please set NRF_FPRINTF_FLAG_AUTOMATIC_CR_ON_LF_ENABLED to 0 (also in sdk_config.h).

[pkoenig]

Is there a way to disable this hardfault handler? I will have a lot of debugging of non radio related code - our app interface, and restarting app after each breakpoint would be painful. I need to implement comm with a host over UART, and would like to do it with softdevice in place. Other option would be creating an app without softdevice, but this will take some time.

Piotr