If mcan_ex4_receive works correctly, it indicates there are likely no hardware issues. Have you looked at the debug tips in http://www.ti.com/lit/SPRACU9? Also, I'd recommend to use the most recent version of C2000ware.

Hi Hareesh，

Thank you for your quick reply.

I have just use the latest version of C2000Ware(C2000Ware_5_01_00_00) and it doesn't work like C2000Ware_4_02_00_00. Also, I have checked the debug tips in the doc of Getting Started with the MCAN (CAN FD) Module.

I have noticed that there is same question in the forum, link as below

TMS320F280039C: mcan_ex9_transmit does not work like intended - C2000 microcontrollers forum - C2000︎ microcontrollers - TI E2E support forums

Can you help to check where the problem is? 

Hi Hareesh,

I have just used the classic CAN demo "mcan_ex7_classic_transmit" and it works well.

So I think there may be some problem in the demo "mcan_ex9_transmit". 

Hi Hareesh，

I have tested the transmission of CANFD for the last few days. The result is as below:

If I dont't enable the BRS, the transmission is OK. However, if the BRS is set, the transmission failed and the Error Passive flag in MCAN_PSR register is set. 

Since our customers have the requirements of CANFD communication, I need your help to check the problem.

Can you find someone internally to do the test? Many thanks!

The fact that mcan_ex4_receive works correctly tells me that the other node is CAN FD-compatible since Nominal Bit Rate of 500 kbps & Data bit rate of 1 Mbps is used in this testcase. I will follow-up with our software team. The upcoming weekend is a long weekend, so expect a response by early next week. 

Hello Hareesh,

Have your software team had a result already?

If yes, please let me know.

Thanks very much!

Hi Hareesh,

Could you help update this case? Is there any update from SW team? Many thanks!

Joyce

Hi Hareesh,

Appreciated for your reply. 

I have read into the deatails you gave in the link. I have a question here that do you use the demo 

mcan_ex9_transmit  without any modification?

As I have replied early above,  I have tested several tests with your CANFD demo routine. Only the CANFD transmit with BRS=1 cannot work well. Meanwhile, I have noticed some other people have the same problem as me in the e2e forum. 

Can you give some advice and tips? I am confused where the problem may be since the CANFD receive and transmit with BRS=0 can work well.   

Many thanks!

Tim,

    Who is the receiver in your setup? It is important the receiver is configured to receive CAN FD frame (and not classic CAN frames). Remember, a CANFD node is capable of receiving both classic and CAN FD frames. However, a node configured as a classic CAN node can only receive classic CAN frames. In my case, I use https://www.peak-system.com/PCAN-USB-Pro-FD.366.0.html?&L=1. This is configured to receive both type of frames. Are you running your code in the F280039 Launchpad?

Hi Hareesh，

I use the Vehicle Spy 3 (A CAN monitoring interface in vehicle industry)as the receiver and I tested the CANFD demo routines in our own PCB.

The interface is configured as below(The CANFD function is enabled)

Based on the above configuration, I have tested your CANFD receive routine (mcan_ex4_receive) and CANFD transmit routine(mcan_ex9_transmit)with only one modification (BRS=0). They are both working well.

But if I use the CANFD transmit routine(mcan_ex9_transmit) without any modification, the transmission cannot work normally(the interface cannot receive correct CANFD frame). So I wonder where the problem is?

As I mentioned in the previous reply, some others have exactly the same problem with me in several posts. Therefore I think I am not alone.  Is there some notice to be concerned when using CANFD transmission with BRS=1? Do you know how to find the root cause?

Thanks very much!

Hi Hareesh,

With some addition: The interface configuration above is verified OK to receive CANFD flexible data  in CANFD application with another MCU(NXP).

Tim,

            I tested this once again today and I had no problem running the example with BRS=1. I did not change anything. I just imported the project and ran it. Here is my test configuration:

• F280039 Launchpad (Are you running this project in the LaunchPad or in your hardware?)
• CCSv12.7
• C2000Ware_5_02_00_00

The only change I had to make was to choose the proper build configuration. 

Once I built the project, I got the below output:

Tim Ding said:

some others have exactly the same problem with me in several posts.

Can you please provide the link for those posts? I only found two.