Application not flashing to board

[bsas]

Hello,

I am trying to flash my application to my NRF51422. In short, the application is a combination of the ble_app_uart and twi_scanner examples, I am reading data from a TWI slave device and sending it via BLE. When I debug the application in SEGGER embedded studio, it runs with no issue. However, when I try flashing this application to the board, it does not seem to work.

I am using NRF Connect to do this, though I have tried drag-and-dropping it as well as using the older nRF Go, all with the same results. I first flash the softdevice with no issue. Then, when I try to flash the application, I don't get any kind of error returned or anything, but my board does not begin advertising, and I do not see it flashed on the nRF Connect GUI. The following screenshot is after I add the two .hex files (my application and the SD), and choose "erase and write":

Is there some kind of setting I didn't enable before building my application or something? Thank you in advance for your help,

Bennett

[Hung Bui]

Hi Benneth,

Have you tried to test with the unmodified example(s) ? When you flash the example and the softdevice do you see it reflected in nRF Connect app ? 

Which softedvice do you use and which SDK version ? 

[bsas]

Hi Hung,

Yes, I've tried using unmodified examples, both with and without softdevices, and they seem to be flashing fine. I see the same thing as above in the nRF Connect app when I flash the examples with SDs.

I am using S130 and SDK 12.3.0.

[bsas]

Hi Hung,

Thank you for your response. After I flash the application and soft device, I do not see it advertise, I don't see anything reported on the nRF Log or anything like that.

i have the NRF51 DK, with a 32 kHz crystal. I also tried using the RC oscillator instead, and get the same results.

Thanks,

Bennett

[Hung Bui]

Hi Benneth, 

Please try to debug the application. You can start first by testing a simple application (the blinky application for example) without softdevice. Just to make sure the chip running correctly. 

Then you can test and debug application with softdevice (ble_app_hrs for example). Please step in the code and debug. 

Please follow this debug guide. 

[bsas]

Hello Hung,

I have debugged my application (along with other unmodified examples) and they run as expected. It's only when I try flashing the application with nRF Connect (or any other method, for that matter) that I do not see the board advertise/application run. Again, it does work when I flash unmodified examples, however.

Thanks,

Bennett

[Hung Bui]

Which IDE do you use to flash and debug your application ?

If you debug your application did it work ? 

Which modification did you make ? If you simply change the advertising name, would it work ? 

[bsas]

Hi Hung,

I'm using SEGGER.

Yes, if I debug the application in SEGGER, it works fine.

I've added some of the TWI_Scanner functions to my project, as well as modifying the nus_data_handler function to send some data from the TWI slave when it recieves certain characters via BLE.

Yes. As a test, I used ble_app_uart and changed the name of the device and flashed the hex and SD to my board, and it works fine.

Thank you,

Bennett

[Hung Bui]

If instead of debugging you simply flash your application using Segger Embedded Studio, would it work ? 

Are you testing on your custom board or a nRF51 DK ? Do you have 32kHz crystal on the board ? 

If you test the TWI example would it work ?

[bsas]

Hi Hung,

I have resolved the issue. I'm not 100% what the issue was, but I believe it was some incorrect FLASH/SRAM linker macros.

Thank you for all your help.