Segger Embedded Studio not linking nRF51 SDK examples

[MaurizioB]

Hello, 

I tried to build the SDK ble_app_beacon example for nRF51 using SES. SES version I used is V4.12 (for Windows 64 bit) and SDK version is 12.3.0.

I closely followed the instructions reported in this tutorial. Since SES and SDK versions are different than reported in the tutorial and since I'm targeting nRF51-DK board (as opposed to the nRF52 board used in the tutorial), I applied the following minor (?) changes:

• I imported the file C:\Nordic\nRF5_SDK_12.3.0_d7731ad\examples\ble_peripheral\ble_app_beacon\pca10028\s130\arm5_no_packs\ble_app_beacon_pca10028_s130.uvprojx
• I included the files system_nfr51.c and 3324.ses_nrf51_startup.s into the "Internal Files" folder of Project Explorer. Initially I replaced the existing file SEGGER_THUMB_Startup.s  with the file thumb_crt0.s (modified as described in the tutorial). Since however I was getting many linking errors (indicating that most of the symbols used in thumb_crt0.s were undefined), I ended up removing  thumb_crt0.s and keeping SEGGER_THUMB_Startup.s (as indicated in the below screenshot).
• In order to get rid of a compile error "cannot open source input file core_cm0.h", I also included the following directory within the Preprocessor user's includes: ../../../../../../components/toolchain/cmsis/include.
• I managed to load the flash_placement.xml file, corrected also to include the following additional line: <ProgramSection alignment="4" load="Yes" name=".fs_data" />

My Project Explorer looks like this:

After building, I obtain the following errors: undefined symbols __SRAM_segment_end__ and __data_start__

Can you please help me to figure out how to solve the problem?

Thank you very much!

[Bjørn Kvaale]

What did you write under the Section Placement Macros field? Did you remember to add FLASH_START & SRAM_START?

[MaurizioB]

Hello Bjorn,

In the latest version of SES there is no "Section Placement Macros" field: the closest I was able to find (hopefully it's the corect field) is: Project-->Options-->Build-->Memory Map Macros. In that field I wrote:

FLASH_START=0x1F000

SRAM_START=0x20002000

I don't know if the above values (reported in the tutorial for nRF52) are valid also for nRF51. In any case, after building, the same linking errors appear.

[haxxa]

I too am facing the exact same issue, no idea how to resolve it. I have also followed the sames steps as MaurizioB .

[haxxa]

I just tried using SDK11, and still facing the same issue. Definitely something has changed in the latest Segger version as I can't build any imported Project without "undefined symbol: __SRAM_segment_end__" and thus nothing for the NRF51 Platform. 

[Omnipara]

I changed the target to nrf51822  and this undefined issue got resolved