Porting from nRF52840 to nRF52811

[sumit-adep]

Dear Nordic,

I have developed an application for nRF52811 on nRF52840-DK.

For this i have referred examples -> peripheral -> template_project.

I have followed https://docs.nordicsemi.com/bundle/sdk_nrf5_v17.1.0/page/nrf52811_user_guide.html article
done changes in my *emProject file but then failed to compile the project.

Looking forward from your side.

[Hung Bui]

Hi Sumit, 
What change did you do ? What error did you receive ?

Have you simply use the pca10056e folder ? It's made for the nRF52811 

[sumit-adep]

Hi Hung Bui,

My end goal is to develop an application for the nRF52811 SoC. However, for ease of development, I started working on the nRF52840-DK with the plan of transferring the project to the nRF52811 SoC later.

I came across the article titled "Creating your own emulated project", which explains the steps to emulate the nRF52811 SoC on the nRF52840-DK.

Creating your own emulated project

If the emulated project is not available for the example you need, then complete these steps to emulate the nRF52811 SoC.

Converting a standard PCA10056 project to an emulated project

1. Open the example project for your IDE.
2. In the project settings, change to device "NordicSemiconductor->nRF52811_xxaa".
3. In the C/C++ preprocessor settings, remove the defines "NRF52" and "NRF52840_XXAA".
4. Add the preprocessor define "NRF52811_XXAA".
5. In the linker script settings, adjust the linker script to match the maximum RAM and flash size of nRF52811.
   • ROM END: 0x2FFFF
   • RAM END: 0x20005FFF
6. Remove the following files from the project: <compiler>_startup_nrf52.s and system_nrf52.c.
7. Add the following files to the project: <compiler>_startup_nrf52811.s and system_nrf52811.c.
8. Add the DEVELOP_IN_NRF52840 define to the compile flags. Adding this define will add extra code in SystemInit needed for nRF52840.
9. Add the NRFX_COREDEP_DELAY_US_LOOP_CYCLES=3 define to ensure correct timing when using nrf_delay_us function.

Steps Taken:

1. Base Project:

   • Selected an example from the SDK under examples/peripheral.
   • Noticed that there wasn’t a separate pca10056e folder, so I decided to create my own emulated project.

2. Device Settings and Preprocessor Changes:

   • Changed the target device in the project settings to NRF52811_XXAA.
   • Updated preprocessor settings:
     • Removed: NRF52 and NRF52840_XXAA.
     • Added: NRF52811_XXAA.

3. Memory Configuration:

   • Adjusted the linker script to reflect nRF52811 memory sizes:
     • Flash end: 0x2FFFF.
     • RAM end: 0x20005FFF.

4. Startup and System Files:

   • Removed: <compiler>_startup_nrf52.s and system_nrf52.c.
   • Added: <compiler>_startup_nrf52811.s and system_nrf52811.c.

5. Compile Flags:

   • Added DEVELOP_IN_NRF52840 to the compile flags for necessary adjustments to SystemInit.
   • Defined NRFX_COREDEP_DELAY_US_LOOP_CYCLES=3 for accurate timing in the nrf_delay_us function.

6. Compilation:

   • After making all these changes, the project compiled successfully in Segger Embedded Studio (SES).

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Issue Faced:

Even though I modified the linker script and project settings, the IDE still displays 1 MB flash and 256 KB RAM, which correspond to the nRF52840 SoC.

For the nRF52811 SoC, the memory should be:

• Flash: 256 KB
• RAM: 24 KB

I am unsure if my current configuration is correct for emulation or if there are additional steps required to reflect the correct memory sizes in the IDE.

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I am using:

• nRF5-SDK v17.1.0
• Segger Embedded Studio (SES)
  
  
  
  
  

Any guidance would be greatly appreciated!

Thank you in advance!

[Hung Bui]

Hi Sumit, 
Please show how you configure the Flash and RAM ? 
For example here is what in the pca10056e project for ble_app_template: 

One trick to do this convert process is to use a text compare tool to check the difference between the pca10056 and pca10056e project. For example if you use Notepad++ you can compare them like this: 


From that you would know what you need to do with your project to convert the project to nRF52811