sd_ecb_block_encrypt() related question

[Valer_I]

Hello, I just want to clarity the sd_ecb_block_encrypt() operation cases (S110).

In pp. 23.1.3 of RM (Shared resources) sayed:

The ECB, CCM, and AAR share the same AES module. The ECB will always have lowest priority and if there is a sharing conflict during encryption, the ECB operation will be aborted and an ERRORECB event will be generated.

In PS sayed:

Time for a 16 byte AES block encrypt. 8.5 - 17 μs

So the question is whether the sd_ecb_block_encrypt() handles ERRORECB event and waits untill shared resource become available to perform the ECB encryption. If correct answer - YES, what timings of the sd_ecb_block_encrypt()?

[Jørgen Holmefjord]

Which version of S110 are you using?

[Valer_I]

S110 V.8.0.0

[Jørgen Holmefjord]

Hi,

A call to sd_ecb_block_encrypt() will block until the encryption is completed. If encryption is interrupted by higher priority call, the function will retry over and over until it is successfull. The timing will thus depend on what other tasks require access to the shared resource.

Best regards,

Jørgen

[Valer_I]

Thanks, now its clear!