topic 回复： SPD Driver and FCCU BusFault in S32K

SPD Driver and FCCU BusFault

iverson3ya — Mon, 20 Nov 2023 06:27:49 GMT

When initializing FCCU, it jumps to the BusFault_Handler. The following is the error location.

Please help me resolve it. Thank you.

Re: SPD Driver and FCCU BusFault

petervlna — Mon, 20 Nov 2023 13:21:21 GMT

Hello,

Just a quick check.

Are you step debugging FCCU in Config phase?

If yes, FCCU watchdog will abort operation.

Please share more details on the issue.

Best regards,

Peter

回复： SPD Driver and FCCU BusFault

iverson3ya — Tue, 21 Nov 2023 01:12:09 GMT

I'm not step debugging FCCU

After execution, the program will automatically abort and jump to BusFault_Handler

It stops at the following code

addr = ERM_SR_ADDR32( au32InstanceBaseAddr[u32i], u8j );

What parts do I still need to check?

I can run normally on SPD 1.0.2 and RTD 2.0.3.

I am currently using SPD 1.0.3 and RTD 3.0.0.

回复： SPD Driver and FCCU BusFault

petervlna — Tue, 21 Nov 2023 08:13:46 GMT

Hello,

To find the reason of your bus fault please check the BusFault Status Register and BusFault Address Register. I expect you are writing to protected area. For example FCCU registers which are not unlocked, etc...

Best regards,

Peter

回复： SPD Driver and FCCU BusFault

iverson3ya — Tue, 28 Nov 2023 02:23:54 GMT

I'm not sure if I'm checking it correctly, but it seems like all the values inside are 0. I still don't know the reason behind this.

回复： SPD Driver and FCCU BusFault

petervlna — Tue, 28 Nov 2023 08:35:13 GMT

Hello,

You are looking at CFSR register.

What is the content of BFSR?

Please refer to my explanation above.

Best regards,

Peter

回复： SPD Driver and FCCU BusFault

iverson3ya — Tue, 28 Nov 2023 09:14:43 GMT

The BFAR is 0x00 in the upper image, and I did not observe the BFSR.

回复： SPD Driver and FCCU BusFault

petervlna — Thu, 07 Dec 2023 10:44:04 GMT

Hello,

ok, have a look at following thread:

https://community.nxp.com/t5/S32K-Knowledge-Base/Fault-handling-on-S32K14x/ta-p/1114447

especially in this part:

You can do debug step by step and check on which exact store/load instruction the bus fault is triggered.

Have in mind that FCCU in configuration mode has watchdog, so do not step debug that part.

Best regards,

Peter