RM44L920: DCAN RX data recieved on Rx pin but data is not stored in Rx_data

Hi

we also faced same issue but our setup is little different than yours . We are using 2 boards insted of can1 and can2 . we sending from can2 of a board and getting in can2 of other board. If you find any solutions for this please let me know.

Anyway i m alos getting data in RX lines of receiver side by probing but not able to get it in my SW.

Hi Karthik,

Actually i tested CAN example on TMS570LC4357, you can refer them.

But i don't have any other board of RM44 to create an example and test it. Let me think and do a test on similar board.

8055.CAN_TEST_LC4357.zip

3010.CAN_TEST_POLL_LC4357.zip

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Thanks & regards,
Jagadish.

Hi Jagadish,

I tired working with your above code and halcogen settings still the same issue.Rx data is recieved but not on Rx data buffer.

Hi Jagadish,

I found that Identifier addressing bits should be same as CAN id (whether extd or standard , so i tired changing the identifier and still the issue exist , Can message not recieved at Rx_data and there is error notification "canLEVEL_WARNING" , Can you explain what this error means?

Hi Karthik,

Your HALCoGen settings looks fine, i need your complete project for better assistance.

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Thanks & regards,
Jagadish.

Hi Jagadish ,

I am using the example program only "example_canCommunication.c"

Hi Jagadish ,

I found one of the previous thread with the same issue , could you confirm whethere this is the reason.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1048388/rm42l432-problem-with-can-on-rm42l432/3909063#3909063

KARTHIK R said:

I found one of the previous thread with the same issue , could you confirm whethere this is the reason.

No Karthik, your issue is not same as the issue given in above thread.

There the customer configured two Tx messages with same ID for two different CAN nodes. In your case you are enabling only one message ID in each CAN node right and they also configured in Tx and Rx not as TX and Tx right. So, it is not a problem.

By the way which CAN transceiver you are using, 

You said you verified Tx and Rx points with logic analyzer right? Did you compare the data of Tx and Rx are they same?

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Thanks & regards,
Jagadish.

Hi Jagadish,

I am using 'TCAN1051HV' and i checked the Tx and Rx data both were same.

And regarding the above thread , i assume its the same issue because i am using two CAN nodes CAN1 (TX) & CAN2 (RX) with same message ID and two can Nodes cannot have same message ID as per that.correct me if am wrong.

Hi Karthik,

KARTHIK R said:

i assume its the same issue because i am using two CAN nodes CAN1 (TX) & CAN2 (RX) with same message ID and two can Nodes cannot have same message ID as per that.correct me if am wrong.

No, it is not same.

There they are using same ID for Node-1 Tx and Node-2 Tx

Now see, if node-1 transmits CAN frame with message ID-1 who will receive. Nobody right because no Rx configured with ID-1?

Similarly, if Node-2 to transmits CAN frame with message ID-1 then who will receive? Nobody right.

In CAN bus each Tx CAN node should have different ID and similarly each Rx CAN should have different CAN ID, and also one CAN Tx ID should match with one CAN Rx ID because if Tx node transmits CAN frame it should need to receive by corresponding ID Rx node.

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Thanks & regards,
Jagadish.

Hi Jagadish,

Okay understood , but why does the can Recieve function is not working , any possible reason?