Issue trying to run a program from Segger embedded studio

[Gerardo Martin]

Hello all,

I am trying to use my nRF52832 DK for a wireless camera shutter for my phone. I have reviewed the example code from SDK 15.3.0 named ble_app_hids_keyboard as well as modifications to this code to include volume control. 

link to GitHub that modifies SDK 15: https://github.com/Rallare/nrf51_ble_app_hids_kbd_consumercontrol/tree/SDK15

When I try to build and run the example code in Segger embedded studio I have problems connecting my iPhone to the board via Bluetooth. However, I can use the hex files just fine by dropping those files in the external J-LINK drive window. I am not too familiar with hex files; I don't know where they come from but I know they can upload code to my board. The example code from the SDK works fine on my iPhone only if I upload the hex file. Does Segger embedded studio make these hex files/where do they come from?

I bring up the modifications because I want to build, and run those new volume controls with the example code from SDK. The GitHub repo doesn't include hex files so I'm not sure how I can continue working on this without fixing this problem. If you have any suggestions regarding Segger embedded studio or how to incorporate the volume control modifications to the example SDK code I would really appreciate it.

Gerardo Martin

[Jared]

Hi,

The hex file is the output from the build process in SES. Usually we include the pre-compiled hex files with projects so that the end user doesn't need to build the project before they can flash the project to their nRF. 

When I try to build and run the example code in Segger embedded studio I have problems connecting my iPhone to the board via Bluetooth

 I just tried downloading the project and after building and flashing it to the nRF it worked without any issue! Does it build in SES without any issues for you? You might need to shorten the project name as Windows has a maximum length on path. 

Also, if you're new to SES then I suggest watching this tutorial.

regards
Jared 

[Gerardo Martin]

Well after a bit of snooping on this site, I was able to fix the problem thanks to this solution:

J-link driver windows update and the help of the youtube video you provided. 

Now that I can properly download code to the board from within SES, do you have any suggestions trying to incorporate that gitHub code to include consumer controls such as volume control in the stock SDK? I can run the stock SDK 15 ble_app_hids_keyboard well on my board now but I would like these additional features. As I mentioned, there is Arduino code that can do volume control but it's been a mess dealing with the bootloader stuff. 

Thanks again

[Jared]

Hi,

Gerardo Martin said:

do you have any suggestions trying to incorporate that gitHub code to include consumer controls such as volume control in the stock SDK?

 Are you referring to the Github project? You only need to clone the repository to../examples/ble_peripheral folder in the SDK. 

regards

Jared 

[Gerardo Martin]

I cloned the GitHub repository where I keep my nrf SDK 15.0.0 folder and I am getting a "stopped by vector catch" error. In the call stack, it references ble_hids.c and the functions that were called. It looks like it's getting stuck with the first call of memset inside of void on_connect().

My phone won't connect to it because it takes too long and the led that shows advertising stays on. It looks like there's a memory issue with connecting a phone to it.

Could you help with the debugging process on SES?

[Jared]

Hi there,

Could you share a screenshot of debug view which shows where exactly it's stuck and the call stack? 

Gerardo Martin said:

where I keep my nrf SDK 15.0.0 folder and I am getting a "stopped by vector catch" error.

 You have to specifically put it under SDK_ROOT/examples/ble_peripheral folder for it to work.

 

regards

Jared

[Gerardo Martin]

I keep my sdk 15 in my C: drive and I've copied the github repo inside of ble_app_hids_keyboard that's in the ble_peripheral folder.

Thank you

[Jared]

Hi,

Can you upload your entire project here as a zip so I can try to reproduce it at my end? As I've said earlier, I was able to download the project and run the example.

regards

Jared 

[Gerardo Martin]

ble_app_hids_keyboard.zip

Here you are. I can run the example project from Nordic just fine, I would just like to add the consumer controls to it. This isn't the original nordic project from sdk 15.0. This has the code from github copied into it.

[Jared]

Hi,

The application hardfaults because ble_hids_client_context_size_calc() returns an extremely high number that is passed on to memset(). ble_hids_client_context_size_calc() does this because its argument the p_hids it's not initialized correctly. More specifically, the member variables  input_report_array[] and output_report_array[] miss the static prefix when they are initialized in hids_init(). 

The fix:

best regards

Jared