nRF5 SDK 12.3.0 nRF51822 lesc example can't be built

[Bee]

Hello, everyone~

I plan to use the Low Energy Secure Connection funtion with nRF51822. But when I build the lesc example in SDK 12.3.0 (ble_multirole_lesc), there's a error like this:

*** Using Compiler 'V5.06 update 1 (build 61)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Rebuild target 'nrf51422_xxac'
compiling bsp_nfc.c...
... ...
compiling fstorage.c...
compiling ecc.c...
..\..\..\..\..\..\..\components\libraries\ecc\ecc.c(56): error: #5: cannot open source input file "uECC.h": No such file or directory
#include "uECC.h"
..\..\..\..\..\..\..\components\libraries\ecc\ecc.c: 0 warnings, 1 error
compiling fds.c...
... ...
compiling softdevice_handler.c...
".\_build\nrf51422_xxac.axf" - 1 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:00:09

The SDK default config can't find the uECC.h file. Where is it? How to repair this project?

[Einar Thorsrud]

Hi,

It looks like you are missing the micro-ecc library. It is not included in the SDK distribution, so you must download it and build it yourself as described under Installing micro-ecc in the SDK documentation.

[Bee]

Oh, I know, thanks! But if I am using SES as a compiler, need I creat a new folder like "InstallFolder\external\micro-ecc\nrf51_ses\armgcc"? And with SES, what else should I do?

[Einar Thorsrud]

It should be OK to just use the <SDK>\external\micro-ecc\nrf51_armgcc\armgcc\, as this has the same format as needed by SES. There is nothing particular you need to do in SES except for what you would need for any other binary library: add the binary library (micro_ecc_lib_nrf51.a) to the project and add the library to the include path (<SDK>\external\micro-ecc\micro-ecc\).

[Bee]

Thank you~ I'll try that!

[Einar Thorsrud]

One more thing: you would probably want to make some updates to handle the recently discovered security issue with LESC pairing. There is a fix in this post.