Kinetis MicrocontrollersのトピックK66 : How to recognize a Flexbus bus error ?

K66 : How to recognize a Flexbus bus error ?

koichisakagami — Wed, 02 Nov 2016 07:00:21 GMT

Dear community,

I am checking a Flexbus specification with the Reference Manual .

It is described in the External Bus Interface (FlexBus) chapter
that some types of accesses cause a transfer to terminate with a bus error.

I hope to detect (recognize) the bus errors on Flexbus bus.

[Question]
I think that I can detect the bus error,as the bus error cause the Bus Fault interrupt.
Is my understanding currect ?

Best Regards,
Koichi Sakagami

Re: K66 : How to recognize a Flexbus bus error ?

xiangjun_rong — Thu, 03 Nov 2016 06:35:17 GMT

Hi, Koichi,

The FlexBus module is a peripheral module, if a FlexBus error heppens, I think the hardware fault interrupt (index 3) will be triggered. As a test, you can generate FlexBus error, in the case, if you do not define the ISR, the Kinetis will execute the line:

b DefaultISR

You can check the Low 8 bits of xPSR in debugger, which is ISR_NUMBER

Hope it can help you

XiangJun Rong

Re: K66 : How to recognize a Flexbus bus error ?

koichisakagami — Tue, 08 Nov 2016 05:32:38 GMT

Dear XiangJun ,

Thank you for reply.

I checked the FlexBus Bus error.

And I confirmed that the FlexBus Bus error generates the hardware fault interrupt .

Thank you for your information.

And

I hope to get the register information to determine the Flexbus Bus errors occurrence in hardware fault interrupt handler.
What kind of status register bit does indicate the Flexbus Bus errors occurrence ?
Or is it impossible to determine the Flexbus Bus errors occurrence by register status ?

Best Regards,

Koichi Sakagami

Re: K66 : How to recognize a Flexbus bus error ?

xiangjun_rong — Wed, 09 Nov 2016 03:31:32 GMT

Hi, Koichi,

I do not think theer is error status for the FlexBus error, so it is impossible to determine the Flexbus error occurrence by register status.

Xiangjun Rong