TMS570LC4357: TMS570LC4357 canREG1 cannot read data sent from external CAN assistant

This is my main function

Hi Ayanami,

I created and tested one loopback test example with interrupt mode, can you please take it as reference and verify the configuration settings at your end and disable loopback and test it.

CAN_TEST_LC4357.zip

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Thanks & regards,
Jagadish.

Hi Jagadish,

I tested the engineering files you provided, but my CAN assistant displayed extended frame message. When I tried sending an extended frame to 4357 using the CAN assistant, the program got stuck at this line, flag is 0 showing that no new data entered the buffer. Can this be an indication of a hardware issue?

Thanks & regards

Ayanami

Hi Jagadish

      I confirm that I have selected this module, and I can see the incoming extended frames on the CAN assistant. However, when I send the same format of extended frames to the chip, the CAN module fails to receive them correctly. During subsequent experiments, I used the test file you provided. The code module for receiving data is as follows.I successfully transmit the first data.The program gets stuck at this line while receiving data, as the flag = node->NWDATx[regIndex] & bitIndex  value remains 0, and I am unable to read the data I sent from the external source. I have attached screenshots of the external CAN assistant for receiving and sending.Can you please help me troubleshoot this issue? 

Thanks & regards,

Ayanami

Hi Ayanami Ray,

I guess you have to change the message ID right?

message ID 0x7B i.e 123 is for transmit ID from TMS570LC4357 to the CAN assistant, so please verify what message ID you configured for receiving and configure same ID in CAN assistant and send the frame.

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Thanks & regards,
Jagadish.

Hi Jagadish

I previously modified the CAN1’s IF2’s ABR register and now I restored your code and tested it again. According to the requirements of the IF2’s ABR register, the extended frame ID I sent should be 0x1C8. I set this frame ID in the CAN assistant, but my program still gets stuck at this step. I followed your provided code step by step. Could you please help me identify the problem?

Thanks & regards,
Ayanami

Hi Ayanami,

Can you please zip and attach your complete project once? I could verify it at my end once.

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Thanks & regards,
Jagadish.

Hi Jagadish,

I'm sorry, I'm not familiar with the process of uploading local files on this forum. The project I'm testing is the CAN_TEST_LC4357 that you provided. I made only one modification by adding code for interrupt-based transmission and waiting for reception within the first 'while(tx_done == 0)' loop. I sent an extended frame with an ID of 0x1C8 using a CAN assistant, but the code didn't detect any data arrival. The value of 'node->NWDATx[regIndex] & bitIndex' remains unchanged. This is the issue I'm facing. Can you ensure that the code you provided can correctly receive messages sent from an external CAN assistant?

Thanks & regards,
Ayanami.

Hi Ayanami,

Please check my first comment on below thread

(+) TMS570LC4357: TMS570LC43X - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

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Thanks & regards,
Jagadish.

Hi Jagadish,

   Thanks for your patience and could you please send me a copy of the code that can use the CAN email to receive external CAN data.I'm using 4357 development board

5483.CAN_TEST_LC4357(1).zip

Thanks & regards,
Ayanami.

Hi Ayanami,

Your code looks confuse for me, because why you are calling notification functions inside while loop?

It should be automatically call by CAN module after sending a packet or receiving a packet.

So, i just took my old code i did a small modification and tested the issue you are mentioning.

Here i just want to test the receiving functionality of CAN1 right, so i just put while(1) after sending packets through CAN1

So, i just don't want to test CAN2 because here i am not looping CAN1 and CAN2 right.

And remember i don't have CAN assistance tool you mentioned instead of we have a tool called PCAN view which is also a similar USB to CAN adapter you are mentioning.

And after i starting debug as usual i received 512 CAN frames to the PCAN view as shown below

After this the debugging stopped at while(1) we added. Now i sent a CAN frame from PCAN view as shown below 

After sending packet from PCAN view, now you can see that i hit the breakpoint in the CAN notification function for CAN1 Rx

After doing running from that breakpoint now you can see that i received the data into the Rx buffer

I am attaching my code for you reference and please do similar test and update the result.

5280.CAN_TEST_LC4357.zip

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Thanks & regards,
Jagadish.

Hi Jagadish,

   I have download the project you attached.I tested it with breakpoints according to the process you provided. The only thing I changed was that the baud rate was changed to 1000kbps (according to my hardware conditions). 

  My external can tool has successfully received the data, but when I send the extended frame whose frame ID is 0x01C8, the program is always stuck in the while (1) without jumping to the canMessageNotification function.

  I have a question, since the canMessageNotification function is not written into the main function, how does it jump. Hope you can help me to solve the problem I am facing.

Sorry to bother you so many times

Thanks & regards,
Ayanami

Hi Ayanami,

Did you directly used my entire project or you just copied the main.c and tested?

I mean if you use my entire project then it should work without any issue as it worked on my end.

Ayanami Ray said:

I have a question, since the canMessageNotification function is not written into the main function, how does it jump. Hope you can help me to solve the problem I am facing.

Whenever the CAN interrupt generated 

First it will check whether it is due to any CAN error or not, if it is not due to CAN error then it must be due to either due to sending CAN message successfully or due to receiving a CAN message right, So in that case it will the function "canMessageNotification". And this process is given in the "can2HighLevelInterrupt" function. So, we should not call this canMessageNotification function from main.

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Thanks & regards,
Jagadish.

Hi Jagadish,

 I did download your project for testing. In the current situation, I suspect that my external CAN assistant is not sending the desired frame ID, causing the issue. I would like to know how to set the IF2 registers in the initialization if I want to receive the extended frame of MESSAGE2 without filtering. Additionally, if I need to receive all data frames without filtering, how should I modify the IF2 registers?

   /*SAFETYMCUSW 28 D MR:NA <APPROVED> "Potentially infinite loop found - Hardware Status check for execution sequence" */
    while ((canREG2->IF2STAT & 0x80U) ==0x80U)
    { 
    } /* Wait */

    canREG2->IF2MSK  = 0xC0000000U | (uint32)((uint32)((uint32)0x000007FFU & (uint32)0x1FFFFFFFU) << (uint32)0U);
    canREG2->IF2ARB  = (uint32)(0x80000000U | (uint32)0x40000000U | (uint32)0x00000000U | (uint32)((uint32)((uint32)456U & (uint32)0x1FFFFFFFU) << (uint32)0U));
    canREG2->IF2MCTL = 0x00001000U | (uint32)0x00000400U | (uint32)0x00000000U | (uint32)0x00000000U | (uint32)8U;
    canREG2->IF2CMD  = (uint8) 0xF8U;
    canREG2->IF2NO   = 2U;  

Thanks & regards,

Ayanami

Hi Ayanami,

Ayanami Ray said:

if I need to receive all data frames without filtering, how should I modify the IF2 registers?

You can keep Mask bits zero's

If mask bit becomes zero then the corresponding bit will not be used for acceptance filtering.

just try to write all zeros instead of default 0x7FF in the mask field.

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Thanks & regards,
Jagadish.

Hi Jagadish,

  I tested the project you posted with another 4357 HDK and other CAN assistants, but the phenomenon is the same as before, the data sent by the CAN assistant cannot be read by the program, and I can’t figure out where the problem is.