FlexCAN_A HW pin connection confirmation for MPC5646C

[deepak_tech]

Hello,

For can application testing on FlexCAN_A wanted confirmation on CAN connections for below board used.

1) XPC564xB/C 176LQFP MINIMODULE Rev. A (daughter board)
2) XPC56XX EVB MOTHERBOARD

As per board schematic and Board manual followed the connections CNRXA/CNTXA (High speed CAN used), but still see communication is not up.

XPC56XX EVB MOTHERBOARD connection:

1) J15.1 and J15.3 shorted

2) J15.2 and J15.4 shorted

3) J14 shorted

Is there anything else that to be taken care.

Regards,

Deepak

[Akhil_Karnam]

 Hello @PetrS 

Can you please provide the Data sheet , User Manual and Schematics  of the following boards :-

1) XPC564xB/C 176LQFP MINIMODULE Rev. A (daughter board)
2) XPC56XX EVB MOTHERBOARD

BR

Akhil

[PetrS]

Hi,

seems you have quite old revisions of boards. See attached files I only found.

BR, Petr

[cuongnguyenphu]

Hi @PetrS  @deepak_tech @Akhil_Karnam 
Yesterday I joint the debug call with Elektrobit and this is the current situation:

Behavior:
Mother board Rev.B
Daughter board Rev.A

 1. 1) J15.1 and J15.3 shorted

    2) J15.2 and J15.4 shorted

    3) J14 shorted

    -> Notice 'Can_IsrFCA_BO' ISR triggered

       No signal CANH, CANL captured on RS‑232 serial port

 2. Connect J15 1-2

    -> Notice 'Can_IsrFCA_BO' ISR triggered

Request from Elektrobit:

1. Recheck Daughter Board schematics for "Rev A" -> The current Daughter board Schematic you shared with Elektrobit is RevB, while the actual board is Revision A. EB would like to know if the doc can be use for their board, and is it compatible to use Daughter board Rev A and Motherboard Rev A

2. Do you have the demo code for CAN communication on this board?

They also share files include the Board image, CAN register dump before and after Can_IsrFCA_BO. if you need I can share to you in private

[deepak_tech]

Hello Petr,

Apology for delayed response, I have attached eval board pic for connections

From testing, since i had limited access to HW setup configured 'CanLoopBackMode' as true in CAN configuration, and see no 'Can_IsrFCA_BO' ISR triggered and 'Can_IsrFCA_MB_00_03' ISR is triggered

Regards,

Deepak

[PetrS]

Hi,

I did not talk about internal loopback, I meant doing external wire connection without transceiver connected, so remove J15 jumpers and connect J15 1-2. Aftre message is sent you should see message transmitted still on this connection.

But if you see no 'Can_IsrFCA_BO' ISR triggered and 'Can_IsrFCA_MB_00_03' ISR is triggered, this would indicate proper transmission, as Busoff interrupt is not triggered, but you get MB interrupt which is called upon successful transmission/reception without error detected.

BR, Petr

[PetrS]

Hi,

can you specify the XPC56XX EVB MOTHERBOARD version you have?
Generally the connection you mentioned is right. What is not working in fact?
Do you see any signal on TXD/RXD/CAN lines, using scope/analyzer, when MCU is sending message on CANA?
You can test right pin assignment if you disconnect CAN transceiver and just connect TXD/RXD together, send message, you should see CAN frame transmitted repeatedly.
The same should be seen if CAN transceiver is connected, it is active, but disconnected from a CAN bus.

BR, Petr 

[deepak_tech]

I could see MOTHER BOARD version as --> MPC560xB Eval Board

And while debug from SW I see BUSOFF ISR triggered

[PetrS]

Hi,

please share photo of the boards, so jumper setting etc can be reviewed.

If you enter bus off state, it indicates pin setting is wrong or transceiver is not active or similar.
Do test I wrote, do external loop connection without transceiver connected and send message. It should end in error passive state, due to ACK missing. You can check module ECR/ESR1 registers as well. Then do the same with transceiver connected normally, but disconnected from bus.

BR, Petr