Hello everybody.
This post is about how to use Segger Embedded Studio for ARM with NRF51 series microprocessors. There is a tutorial about import keil project to ses. However, tutorial is about NRF52 series. When I examined the devzone, I saw that many people have problems about working with ses and nrf51. Also, there were some problems that I couldn't solve until now such as https://devzone.nordicsemi.com/f/nordic-q-a/40349/segger-embedded-studio-project-does-not-run-code-without-press-reset-button. Finally, I succeeded in transferring keil project to ses with all futures like debug or download. The SDK v12.3 with segger support can be found on https://github.com/srcnert/nRF5_SDK_12.3.0_d7731ad_ses.support.
Additionally, I wanna summarize the steps of this transfer as follows.
1) Download SDK v12.3.0.
2) Add SDK to "flash_placement.xml", "ses_nrf51_startup.s" and "thumb_crt0.s" to "/components/toolchain/embedded_studio" folder.
(Destination of the files: Nordic's guide has the links for these files:
- infocenter.nordicsemi.com/.../flash_placement.xml
- infocenter.nordicsemi.com/.../ses_nrf51_startup.s
- thumb_crt0.s is from the installed Program Files folder eg on Windows10, typically at C:\Program Files\SEGGER\SEGGER Embedded Studio for ARM 4.50\source\
)
3) Download Segger Embedded Studio v3.52a and open it. (According to responses, Segger Embedded Studio v4.50 is also usable.)
4) Select "File >> Import Project >> Import Keil MDK Project" and select your uvprojx file. And then, select "Internal Toolchain".
5) If softdevice is present, delete "flash_S130...." from Build Configuration section.
6) Navigate to "Project >> Options >> Linker >> Linker" and set "SEGGER" to "GNU".
7) Delete "Internal Files" folder's element and add "flash_placement.xml", "ses_nrf51_startup.s" and "thumb_crt0.s" and "system_nrf51.c".
(You need to change the file filter to see XML files otherwise it appears that the file isn't there in the Add Existing file dialog because it defaults to *.c)
*** "Project >> Options >> Linker >> Section Placement File" must be "../../../../../../components/toolchain/embedded_studio/flash_placement.xml".
8) Navigate to "Project >> Options >> Preprocessor >> User Include Directories" and add following lines.
- ../../../../../../components/device
- ../../../../../../components/toolchain/cmsis/include
9) Navigate to "Project >> Options >> Linker >> Section Placement Macros" and add following lines.
- If soft device (S130 v2.0.1) is not present, FLASH_PLACEMENT = 0x00000000 SRAM_START = 0x20000000.
- If soft device (S130 v2.0.1) is present, FLASH_PLACEMENT = 0x1B000 SRAM_START = 0x200013C8.
*** According to your project, you must adjust SRAM_START value.
(*** the Flash and Ram items are to be entered on separate lines.)
10) If NRF51822 is used, navigate to "Project >> Options >> Preprocessor >> Preprocessor Definitions" and change "NRF51422" to "NRF51822".
11) If NRF51822 is used, navigate to "Project >> Options >> Debugger >> Target Device" and select "NRF51822_xxAA".
12) If softdevice is present, navigate to "Project >> Options >> Preprocessor >> Preprocessor Definitions" and add "NO_VTOR_CONFIG".
13) If softdevice is present, navigate to "Project >> Options >> Loader >> Additional Load File[0]" and select S130 v2.0.1 hex file.
14) Navigate to "Project >> Options >> Target Scripts >> Disconnect Script" and add "TargetInterface.resetAndStop()" line.
*** The step 14 is used to solve download problem. You can see detail at https://devzone.nordicsemi.com/f/nordic-q-a/40349/segger-embedded-studio-project-does-not-run-code-without-press-reset-button
15) Navigate to "Project >> Options >> Debugger >> Register Definition File" and select nrf51.svd file.
--
After these steps, you can switch to Segger Embedded Studio v4.16.
***If ses compiler gives "In function 'SystemInit': undefined reference to '_SRAM_segement_end_error', You must change it to '_RAM_segement_end_error' at startup file and remake step 11.
*** Also, project in "/examples_segger/ble_peripheral/ble_app_template/pca10028/s130/ses_official" directly created at SES (without import keil project) and I recommend using it.
If you see any problem, please inform me. If everybody use the same SDK folder, we can create impeccable SES support for NRF51 series MCUs. If you like the project, don't forget to give stars from the GitHub 
.
Thanks.
(Editted according to MartinC suggestions on March 9)
