CC310 support under FreeRTOS

[dj1234]

Hi,

I'm in the early stages of developing a BLE peripheral device that requires the use of the CC310 CryptoCell on an nrf52840-DK board.

I have managed to implement a basic BLE service by modifying the blinky example with elements from the nrf_crypto_ecdh_pca10056 project.

So far so good.

The next step was to port the prototype service to work under FreeRTOS and this is where I' starting to hit some hurdles.

I have managed to isolate the failure to occur on a call to CRYS_ECMONT_Scalarmult() which is due to the application calling nrf_crypto_hkdf_calculate().

I have tried using the non interrupt version of the SDK as suggested here, however with no luck.

The SDk version I'm using is: nRF5_SDK_15.3.0_59ac345

So my questions are:

1. Does the SDK provide support for the CC310 Crypto Cell under FreeRTOS
2. If so what are the main configuration steps needed to enable this? Are there any example project available?

Thank you very much in advance.

dj

[Susheel Nuguru]

Hi,

Does the SDK provide support for the CC310 Crypto Cell under FreeRTOS

No, We do not officially support the  combination of using CC310 with FreeRTOS just because we do not have this combo in our production testing suite, But It should work in the non-interrupt mode as mentioned in the link you provided.

/Susheel

[dj1234]

Thanks for the response Susheel.

I worked out the issue in my particular case.

For the benefit of others, it was an issue around memory allocation. As described the SDK docs, the crypto functions require a memory allocator and in my case it was the default. With gcc, this was allocating data on the stack causing a stack overflow. Using a combo of the FreeRTOS allocator and statically allocated data solved my particular issue.

dj