HSE S32K358 Status register returning 0

[fp-theophile]

I installed HSE_FW_ABSWAP_2.40, and so far I managed to use to services such as random number generation, signature verify; but for some reasons, when I try to read the status register I get only 0s in FSR which is not normal since if it was actually the case I should not even be able to use HSE services. 

I don't know what is causing this.

Thank you,

Regards

[lukaszadrapa]

Hi @fp-theophile 

Finally I got the board.

The thing is that the status flags (bits 16-31) are visible only in MU0, not in MU1.

Till now, I expected that the status bits are mirrored to all MU instances used for communication with HSE because there's a note in HSE FW RM:

But it's obviously not correct. I will report it. Thanks for pointing this out.

According to this table, MU0 and MU1 are always used for HSE:

So, if you check FSR in MU0, you should see:

For others - I checked this also on S32K344 and S32K312 and it's obviously the same on all S32K3 devices.

So, when checking status of HSE at the beginning of your application, use MU0:

Regards,

Lukas

[fp-theophile]

Hello, 

Thank you for you response, 

To be honest it does not solve my problem because what is strange is that I am actually using MU0 and not MU1 and I still don't read properly , so it seems like I have some kind of bug.

here SEC_MU0_INSTANCE is 0.

Still thank you for the valuables informations you brought.

Best Regards

[lukaszadrapa · Accepted solution]

Ok, I saw MU_1 in your screenshot, so it looked like this is the problem...

In this case, there's obviously something wrong. If you can still use HSE services regardless of the FSR, I would try to erase the firmware by HSE_SRV_ID_ERASE_FW  service and then install the firmware again. Because it works as expected on my side, I do not have other ideas right now.

Regards,

Lukas

[fp-theophile]

Quick update, actually you were right it solved my problem.
I do have some status in channel 0 thank you!

[lukaszadrapa]

Hi @fp-theophile 

yes, I agree, FSR should not be zero if HSE firmware is installed.

I do not have working S32K358 board here right now but if you can wait, I should get one on Monday. I always saw expected content in FSR on other S32K3 devices, so let me check if I can see the same.

Regards,

Lukas

[lukaszadrapa]

I'm sorry for delay, I'm not able to check it this week. I should get the board next Monday.