SDK_ERROR observed

[sa.qw]

Hi Team,

I'm developing a custom app, based on the ble_app_uart.

I'm observing a error : SDK_ERROR (NRF_FAULT_ID_SDK_ERROR).

I'm unable to root cause it and also unable to get any information about this error.

I even though got the error details connecting the debugger.

Can you please share some insight about this crash/error. It will help to debug further the issue.

I understand the 

Below are error details (taken from function app_error_save_and_stop()):-

[Vidar Berg]

Hello,

Please right click on the 'p_file_name' variable highlighted below and select 'string'. The value field will then display the file path to the file where the code assert was raised. The error occurred at line 1213 (0x4bd) in this file, and the error code was 0x11 (NRF_ERROR_BUSY).

Best regards,

Vidar

[sa.qw]

Thank You Vidar.

I was able to see it by checking the memory address, but this approach is even better.

Also, Vidar can you help me to generate disassembly file (*.dis) in Segger Embedded Studio which will help to to debug & view the complete code in disassembly.

I know that the --disassemble, can be used to generate the disassembly but i didnt get the option/place to add this and i guess the Segger Embedded Studio must already have the feature to generate it.

[sa.qw]

Hi Vidar,

Uploading by project file.

5153.ble_app_uart_pca10040e_s112.zip

*Zipping it as it doesn't allow me to upload .emProject file

[Vidar Berg]

Sorry, I'm not seeing any errors in your project file or in flash_placement.xml. Are you able to upload the whole project so I can try to debug it here?

[Vidar Berg]

Do you have a bootloader present when you're debugging this? In other words, are you sure the crash is occuring in the application and not in the bootloader?

[sa.qw]

Hi Vidar,

Sorry to say but I couldn't upload the complete code base.

Can you help me with some pointer on how to debug it or how you will debug it.

Also how you got to know that its a corrupted/invalid stack pointer, as I least expect it because i have a simple application and the execution never comes the Application, it crashes even before it.

I have reasons to say that its not occurring in or due Application as execution never reaches there.

Also, yes I have also added the bootloader.

And FYI, am uploading the binaries (bootloader / soft device / application) though JLINK !

I first use the project dfu\secure_bootloader to write the bootloader (+soft device), then use my project to write the application + soft device. I hope its not an issue.

[Vidar Berg]

Hi,

sa.qw said:

Can you help me with some pointer on how to debug it or how you will debug it.

Are you able to run the application if you only program the Softdevice and application without the bootloader?

sa.qw said:

Also how you got to know that its a corrupted/invalid stack pointer, as I least expect it because i have a simple application and the execution never comes the Application, it crashes even before it.

Because the stack pointer is well beyond the valid address range for RAM (which ranges from 0x20000000 to 0x20006000).

sa.qw said:

I have reasons to say that its not occurring in or due Application as execution never reaches there.

It's not reaching main(), but is it reaching the application's reset handler?

sa.qw said:

I first use the project dfu\secure_bootloader to write the bootloader (+soft device), then use my project to write the application + soft device. I hope its not an issue.

The bootloader will not be able to boot the application unless you also program a valid bootloader settings page along with it. See Combine application, bootloader and softdevice image - Bootloader setting.

[sa.qw]

Hi Vidar,

Vidar Berg said:

Are you able to run the application if you only program the Softdevice and application without the bootloader?

Yes.

Vidar Berg said:

Because the stack pointer is well beyond the valid address range for RAM (which ranges from 0x20000000 to 0x20006000).

ok

Vidar Berg said:

It's not reaching main(), but is it reaching the application's reset handler?

Its not even reaching the application's reset handler, i tried by keeping a breakpoint in reset handler.

Vidar Berg said:

The bootloader will not be able to boot the application unless you also program a valid bootloader settings page along with it

Thanks for the information but i was expecting the project dfu\secure_bootloader will have the valid bootloader settings and while flashing the nordic device via JLink, it also writes the bootloader settings as well. If this is not the case, then

1. can bootloader setting be written via JLink ?
2. Is DFU Secure Bootloader MANDATORY to perform DFU via BLE ?
   1. As, i was trying to add bootloader to enable the DFU via BLE

I guess the issue is with the bootloader setting, as i erased the complete flash via JLink and only flashed the Application + Soft Device via JLink, and i have it working.

[Vidar Berg]

Hi,

Then the problem isn't with the application, but with the bootloader. Please double check that the bootloader project you selected is configured to run on the nRF52810 and not some other nRF52 variant.

[sa.qw]

Hi Vidar,

I'm using the project at location examples\dfu\secure_bootloader\pca10040e_s112_ble\ses.

And even the flag DEVELOP_IN_NRF52832 is defined in the project.

[Vidar Berg]

Hi,

This project has the correct memory configuration to run on the nrf52810. Can you try to debug with the bootloader project and see if you can find out where it crashes?

[sa.qw]

Hi Vidar,

Ok, let me try.

In the mean time I encountered another issue with ble_app_uart application.

I didnt perform any change to the sdk or application, & flashed pca10040e project to nRF52832 ( I believe this is do-able ).

The application crashes after ~3mins. Below is the crash details.