AM263P4-Q1: failed MCAN communication using SDK example(mcan_external_read_write)

Hi Sung-IL,
MCAN side configurations look correct to me. Could you please attach the PCAN USB settings? There might be a mismatch in sampling point or bit rates between both ends.

Best Regards,
Aswathi 

Hi Aswathi,

Thanks for your response.

They realized to test 'canfd_external_read_write' example, but still faced same issue.

Instead of PCAN, they are using CANoe and their CANoe setting is as below for CAN-FD.

Could you please check this?

Here is their modified configuration for canfd_external_read_write example.

Thanks and Best Regards,

SI.

Hi Sung-IL,

Looks like the CANoe side configurations are also correct. Could you please check if the VN tool <--> AM263Px-CC (J5 header) cable connections (CANL, GND, CANH) are as per documentation? Also please tell me what board revision the customer has. Since software side configurations are right, I suspect we are missing something on the CAN transceiver/board end.

Best Regards,
Aswathi

Hi Aswathi,

Their board is

* Board revision

PCB# : PROC159A

OPN# : TMDSCNCD263P

SL# : 27241590157

And, 

for VN tool <-> AM263Px-CC cable connection,

They connected J5 PIN1 and PIN3 to High and Low of CANoe at each to use MCAN4 as below.

Thanks and Best Regards,

SI.

Hi Sung-IL,
Have you tried the suggestion shared by Brennan over mail? 

"Ensure that J21 does not have a jumper populated. When populated, the jumper pulls down the WAKE signal to the TCAN1043A transceiver."

Best Regards,
Aswathi

Hi Aswathi,

Sorry for late response.

Aswathi R said:

Have you tried the suggestion shared by Brennan over mail? 

"Ensure that J21 does not have a jumper populated. When populated, the jumper pulls down the WAKE signal to the TCAN1043A transceiver."

Unfortunately it still does not worked even when they tried the suggestion shared by Brennan over mail.

Could you please share your configuration(HW and SW) and examples you have tested for MCAN  'canfd_external_read_write' example?

Thanks and Best Regards,

SI.

Hi Sung-IL,
Apologies for the delay. I do not have the hardware with me right now, but this is my SW configuration:

PCAN config:

Example config: No change. Using SDK out of box example.

I will send you an image of my EVM on Monday to cross check.

Thanks and Best Regards,
Aswathi

Hi Aswathi,

Is there any update on this?

Thanks and Best Regards,

SI.

Hi Sung-IL,

Sorry for delaying, here is my local setup:

And this is the PCAN View window after running the "mcan_external_read_write" example from SDK 10.02

Best Regards,
Aswathi

Aswathi,

Thanks for this images. Could you please share your source code used in your test?

And pls let me know your CCS and CGT version used in your test. 

Thanks and Best Regards,

SI.

As mentioned previously, it is the out of the box "mcan_external_read_write" example from SDK 10.02. But I have also attached the same project as zip.

mcan_external_read_write_am263px-cc_r5fss0-0_nortos_ti-arm-clang.zip

CCS: Tested in CCS 12.8.1 and CCS 20.2.0 as well

CGT: ti-cgt-armllvm_4.0.1.LTS

Best Regards,
Aswathi

Hi, I just wanted to add:

I can agree with both sides here. The software works out of the box, but I had the same problems.

I checked all the signals and voltages on the hardware and measured the Tx signal from the SoC, but there was no CAN data. Tx only went low one time for 1us. I then unplugged the CC board from the dock and soldered wires on the Rx und Tx lines for easier measuring, and then it worked. I removed the wires and put the board back in the dock and it still worked. So I have no idea what was the issue here. (I also removed R3 and R4 in the process, so I can power the CC-board from any USB-C supply, but I don't think this makes a difference here) btw: the state of J21 does not matter.

I finally found the problem, at least for my case. Somehow I lost the PMIC config from the examples so VSYS_3V3_LDO2 was not available after initial turn on of the eval board. Without it CAN does not work. So if your board looks like in the picture from Aswathi R, i.e. LD22 is off (also LD21), it is a power supply issue.

Hi Aswathi,

When they tested using your SW, there was no improvement and still no TX signal as below.

And also, there was LED 'on'(LD21, LD22) which is different from Frank case.

Could you please let me know how they can debug this?

CCS: Tested in CCS 20.2.0

When they debug SW, they found PC is in the while loop below and it seems there was no semaphore released.

There was LED on in their board as below.

And, when they tried to run canfd_external_read_write_am263px-cc_r5fss0-0_nortos_ti-arm-clang example,

they found CANFD read in interrupt mode fail as below.

Hi Frank,

Thanks for sharing your case and solution!

Thanks and Best Regards,

SI.

Hi Sung-IL,

I thought you were using "mcan_external_read_write" example, not "canfd_external_read_write" that's why I shared the zip for the same.

mcan external example has no issues in the SDK, but the canfd external example has a minor bug. Please use the patch I have shared on this thread for running "canfd_external_read_write" example: AM263P4-Q1: CAN External read write Tx - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Were you not able to run the mcan_external_read_write example I had shared as zip earlier?

Best Regards,
Aswathi

Hi Aswathi,

Aswathi R said:

Were you not able to run the mcan_external_read_write example I had shared as zip earlier?

No. it was not worked.

Sung-IL said:

When they tested using your SW, there was no improvement and still no TX signal as below.

The above is the result running the mcan_external_read_write example you shared earlier as I mentioned, and it was not worked.

Thanks and Best Regards,

SI.

Hi Aswathi,

I'm still waiting customer's feedback on your patch for 'canfd_external_read_write'.

In the meantime, could you please guide me how they can debug this? which register or structure element should be checked why TX can not be completed?

I checking below UG, but could not get details on LEC/DLEC.

https://software-dl.ti.com/mcu-plus-sdk/esd/AM263PX/latest/exports/docs/api_guide_am263px/DRIVERS_CANFD_HLD_PAGE.html#autotoc_md885

For example, how how the 'Ack' error can be checked?

Or is there any other helpful element to check root cause of MCAN communication fail? 

Thanks and Best Regards,

SI.

Hi Aswathi,

This issue was resolved in customer side. Thanks for your support!

Thanks and Best Regards,

SI.