nrf52840 cc310 is not working

[skxo]

Hello,

I use nRF5SDK160098a08e2 SDK version, on ubuntu 16.04.

I use pca10056 (nrf52840 dev-kit).

I want to run cc310 example located at ./examples/crypto/nrf_cc310/

for example, I compile and load successfully aes binary into the device but nothing is printed over UART (TX pin is PA06, I verified in sdk_config).

I tried the sha example and The device is also not running.

If I compile and load a binary from nrf_crypto folder, everything is OK ( have tried rng, sha....) I can see my part debug printf.

So could you test on your side please?

What could be wrong here?

regards

sk

[Jørgen Holmefjord]

Hi,

The CC310 crypto examples do not do any logging over UART, it only provides logging over RTT. You can use J-Link RTT Viewer to see the output from the examples. 

That said, I highly recommend using the nrf_crypto examples with the CC310 backend, and not use the CC310 API directly.

Best regards,
Jørgen

[skxo]

Hi,

thank you for this fast answer. I will download RTT viewer. Could you elaborate on your recommendation about CC310 backend please? regards

[Jørgen Holmefjord]

You can read about the available backend in the SDK documentation: Cryptography library - nrf_crypto

When using the examples in examples\crypto\nrf_crypto\, check that NRF_CRYPTO_BACKEND_CC310_ENABLED is set in the sdk_config.h file (only supported in nRF52840/pca10056 projects).

[skxo]

OK cool, thanks.

I confirm I can see the debug output in RTT Viewer.

Regards

[skxo]

Hi,

in sdk_config.h, I can see

#ifndef NRF_CRYPTO_BACKEND_CC310_ENABLED
#define NRF_CRYPTO_BACKEND_CC310_ENABLED 1
#endif

Can you confirm the CC310 will be used as crypto-processor to compute crypto computations in that case?

regards

[Jørgen Holmefjord]

This define will enable the backend. If it is used for the crypto computations depend on the configuration of the algorithms. nrf_crypto allows you do use different crypto backends for the various supported crypto algorithms.

For instance, to use the CC310 backend to compute SHA256 Hash, you need to set the NRF_CRYPTO_BACKEND_CC310_HASH_SHA256_ENABLED config as well. The nrf_crypto library should give you an error if you have multiple backends enabled for the same crypto algorithm/function.