MPC5xxx中的主题 Re: Example MPC5746R FlexCAN

Example MPC5746R FlexCAN

ronlewis — Fri, 08 Dec 2017 20:35:33 GMT

I am having issue getting the CAN Example for the MPC5746R to work? I am using the 57XX mother board with the MPC5746R-252DS. I would expect that this example would just work.

I have verified that the pin jumpers J37 and J38 are in the 2-3 position. I have also tried with them in the 1-2 position.

I am using s32DS 2017.R1 and an iSystems debugger.

Re: Example MPC5746R FlexCAN

martin_kovar — Mon, 11 Dec 2017 09:50:57 GMT

Hello Ron,

the example you use is created in S32 Design Studio v1.1 and unfortunately, it cannot be import and compiled in S32DS 2017.R1, because there were some significant changes in compiler.

I recommend you create new project in S32DS 2017.R1 and manually copy all necessary source code into new project.

Regards,

Martin

Re: Example MPC5746R FlexCAN

ronlewis — Mon, 11 Dec 2017 15:22:56 GMT

Martin,

I did not have any issues compiling the example. Example compiles and runs on the hardware, but I don't see any activity on the CAN bus. I did create a new project in 2017.R1 and copied over the the code from the FlexCAN project, but I still don't see any CAN Activity.

Re: Example MPC5746R FlexCAN

flyskyr丶 — Wed, 20 Jun 2018 06:45:01 GMT

Hi Ron,

I had tried it and found a problem. CAN2 has 64 MessageBuffer, but it just has 8 MB can be using.

I am very confused. Can you explain it?

Re: Example MPC5746R FlexCAN

ronlewis — Wed, 20 Jun 2018 11:34:34 GMT

I am not sure I understand your question.

The example from above uses MB[0] to receive a message on CAN2,

Re: Example MPC5746R FlexCAN

flyskyr丶 — Wed, 27 Jun 2018 01:26:02 GMT

Hi Ron,

I found and solved this problem.

When using your configuration

MAXMB in this register is not set to 0x3F successfully, it is 0xF. Because of that "This field can be
written only in Freeze mode because it is blocked by hardware in other modes". Only 16 MBs can be used in this case.

So I add that "CAN_1.MCR.B.MAXMB = 63;". Now , 64 MBs can be used. it's fine.