Adapting examples for NRF52840 dongle PCA10059

[Chirantan Kansara]

Greeting to Nordic Team!

I'm new to nordic devices as well as Q&A section, so apologies in advance if I make any mistakes raising a question.

Two things I would like to discuss:

Intro and adaptions I have made so far:

I have got two NRF52840 dongle, but no nrf52DK. I have downloaded and installed nrfConnect, Segger Embedded Studio, and SDK 15.2.0 as well as SDK15.3.0 (I wasn't sure which one I will be needing)I have gone through coule of tutorials fro BLE and Adapting examples for dongle links as follows:

1. https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-advertising-a-beginners-tutorial

2. https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial

3. https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial

and finally for adapting examples for dongle

https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial

Example in use: blinky_app

The first problem :

      I faced was as guided in the dongle programming tutorial, I can't see any preprocessor definitions rather the it says "inherit" and when I click three dots besides it, I find the text box complete empty and nothing over there. Do I need to write all of the stuff shown in the tutorial by myself or it appears by itself and I just need to remove the PCA10056 and replace it with PCA10059. If so, why my preprocessor definitions seems empty. same is case with the linker option it says "inherit" and the text box for linker is empty. Please provide an explanation for this.

Also in a thread I read, I need to explicitly undefine the board I'm not using(in this case it would be PCA10056). Link https://devzone.nordicsemi.com/f/nordic-q-a/43760/adapting-the-blinky-example-from-the-nrf52840-dk-to-the-nrf52840-dongle/171455#171455. Do you confirm this? 

The main Issue:

    I wish to create a project on nrf52840 dongle that accepts data from android app and stores it on SD card and later retrive it and send it to the desktop computer, all these is expected to happen over BLE. One of my friend has created an android app which has a form like structure which accepts several information from the user like Name, age, address, nature of complaints, complaints, etc. So far I'm able to connect my NRF52840 dongle with the android app and nothing further than that. Which SDK examples should I refer for my project? Or do I need to write completely different program for my project? as said earlier this my first time working with NRF device previously I have extensively worked with Arduinos and ESPs.

waiting for timely help and valuable guidance. Thanks in advance

[Einar Thorsrud]

Hi,

If so, why my preprocessor definitions seems empty. same is case with the linker option it says "inherit" and the text box for linker is empty. Please provide an explanation for this.

The reason you only see "inherit" is that you have not selected the common configuration. "Release" and "Debug" both inherit from "Common", and that is where you should do your changes. Please see this screenshot:

Also in a thread I read, I need to explicitly undefine the board I'm not using(in this case it would be PCA10056). Link https://devzone.nordicsemi.com/f/nordic-q-a/43760/adapting-the-blinky-example-from-the-nrf52840-dk-to-the-nrf52840-dongle/171455#171455. Do you confirm this? 

No. There is no need to undefine the other board, just remove the definition in the first place, and add the correct one for the dongle.

Regarding your application, there are no examples that do this for you, but you can find several relevant examples in the SDK. You can find an SD card example under HW peripheral examples and several relevant BLE peripheral examples. You can also find examples of USB CDC for communication with the computer over USB if that is the intention.

Please note that I recomend obtaining an nRF52840 DK to do the development since having a debugger is essential when sorting out issues.

Br,

Einar

[Chirantan Kansara]

I changed the setting to common and then I right click on the project and hit build. I am using ble_app_uart example now. it gave me couple of errors. I am attaching a screenshot of the same. what am I missing now? is uart example not meant to be used with dongle? if so what is the alternate example which would serve the purpose of uart example

[Einar Thorsrud]

Hi,

I see your application starts at 0x1000. This is correct for examples that do not use the SoftDevice since that places the application immediately after the MBR. However, since your application uses the SoftDevice, it should be located immediately after the SoftDevice. If you are adapting an existing example that uses the SoftDevice, that means you should not change the address, since it is already correct. Alternatively, you can check the SoftDevice specification for your exact SoftDevice version, and see the size. The start address of the application is equal to the size of the SoftDevice (including MBR).

[Chirantan Kansara]

Hello! thanks for reply!

I am using s140 softdevice the same which I used while I was burning blinky_app and now I am using ble_app_uart from ble peripheral. Am I going correct I'm using SDK version 15.2.0. I havent changed any memory locations by myself I kept them as it is and just followed the instructions given by you earlier posts. what else do I need to do?

[Einar Thorsrud]

Hi,

Chirantan Kansara said:

what else do I need to do?

It is not entirely clear to me what exactly you have done. The nRF52840 Dongle Programming Tutorial explains all the steps in detail, so basically you should follow that.

As mentioned, it looks to me like you have set the application start address wrong. Can you confirm that it is set to the size of the SoftDevice? Alternatively, can you just show the memory configuration for your project? You find it here:

Since you are adapting a project that uses a SoftDevice you should just keep these settings as is. In other words, with S140 version 6.1.0, FLASH_START for the application should always be 0x26000.

[Chirantan Kansara]

Thanks for the reply!

Now I am trying to upload ble_app_uart example and I am using S140 softdevice. I have made changes in Preprocessor definitions and linker configuration as mentioned in the tutorial. I changed RX tx and two other pins in boards.hex file of PCA100059 as you advised me in earlier post. Apart from these changes I haven't made any changes to the entire coed or its configuration in any sense.

I followed the tutorial:

https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial

and it says I have to edit some definitions in linker as:

Adjust the linker configuration. Set FLASH_START=0x1000 to place the application right above the MBR. You should also set FLASH_SIZE=0xDF000 to make sure that there is room for the bootloader at the end of the flash. Set RAM_START=0x20000008, as the first 8 bytes are used by the MBR for interrupt forwarding and adjust the size accordingly by setting RAM_SIZE=0x3FFF8.

I did the same as it says in the tutorial.

 

Besides 

Einar Thorsrud said:

Since you are adapting a project that uses a SoftDevice you should just keep these settings as is. In other words, with S140 version 6.1.0, FLASH_START for the application should always be 0x26000.

Do I need to make any other changes that differ from the ones that are prescribed in the tutorial mentioned above? If so please let me know in detail.

Waiting for your reply

[Chirantan Kansara]

My apologies the tutorial section says "without Softdevice". I will undo the changes and get back