FlexRay on MPC5748G - Basics implementation

bassduty — Mon, 28 May 2018 16:21:36 GMT

Hello,

I'm trying to write a very basic FlexRay Test code, actually for the moment just to test hardware. There is no OS.

I have some questions about basic stuff :

how can I determine the System Memory Base Address Register (FR_SYMBADR). I mean how to "choose" this address and assure that there is not conflict with other part of code. Because this choosen address will be in a register but not "reserved" by the code. Is it absolutely mandatory to map this address with a structure ?
I understand that the data field part of physical message buffer is linked to the header part via the data field offset (FR_MBDOR). But these data field offset has to be calculated by the application in order to fill FR_MBDOR. Actually, based on the reference manual reading I don't understand how to calculate them. Could you give a example with 2 messages buffers ?
I don't understand the purpose of the message buffer segment feature ( FR_MBDSR[MBSEG1DS] and FR_MBDSR[MBSEG2DS]).
I'm beginner with FlexRay. This is the reason of so basics questions.

Thanks in advance.

Regards

Re: FlexRay on MPC5748G - Basics implementation

1134025279 — Mon, 03 Aug 2020 15:36:27 GMT

Hi，Jonathan

I have the same question as you.

Did you solve the problem? Could you please share us your solution?

Thanks a lot!