TMS570LS1224: Changing CAN ID for different Messages (HalCoGen + DCAN setup)

Roland Keller

Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN

Hi,

I am using a TMS570LS1224 XL2 Board.

The TI Example had no CAN interface, so I added it using HALCoGen to have a working sample for transmitting messages.

(https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1210887/halcogen-user-guideline-for-pinmux-at-halcogen-to-get-pinmux-working)

It is sending out Messages with ID 0x001. But I dont get the Idea of changing the CAN-ID for transmitting different Messages.

When I change the ID for example to 0x458 the CAN Anylyzer sees ID 0x000h and also the Message is empty/corrupt and the Cycletime repeats not with 1sek. It repetas a 000 message with 70ms.

I found a hint , at the C2000 forum using a ID Message Update function.

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1082146/tms320f280025c-send-different-can-messages-with-only-id-change

Therefore found "CanUpdateID()" at the CAN.c library.

But usind this function destroys someting. The message is empty and the CAN-ID is not 001 anymore, it is 000h

without canUpdateID()

The Cycletime is ~1sek as expected and the Message is there:

(CAN-ID 000h is not transmitted in this example code, it was only stored from the PCAN-View CAN montitoring software)

Any funter Ideas how to send Messages with different CAN-IDs?

Many thanks and regards.

over 2 years ago

0 jagadish gundavarapu over 2 years ago

TI__Guru 69811 points

Hi Roland,

The third argument to the "canUpdateID" is not just ID, it is a total arbitration value

So, if we want to change the ID then we should copy the previous value of this register and should change the ID field in backup value and should pass to this function.

If you see above code, i copied the arbitration register value, later i changed the ID field to the required ID and i passed the modified arbitration value to the canUpdateID function.

Please try to perform same thing at your end and let me know.

Thanks & regards,
Jagadish.

0 Roland Keller over 2 years ago in reply to jagadish gundavarapu

Prodigy 55 points

Hi Jagadish,

I understand your explanation. The Function name is not well choosen, so it is misleading.. But I still did not get it working properly.

I am using 11 Bit Identifier, is that the reason for the "wrong" expected Position "1" in the Bit mask

RAW HALCoGen Code sends out a correct message, with ID 1

RESULT:

With register modification and check if ID was inserted to the ArbValue:

RESULT:

Where is the ID gone?

So, because of 11 bit Identifer i shifted the ID 0x458 Value by 18 to the left.

now I get the right ID 458.

But It is now a RTR Frame (Remote Transmission Request)

It was not a RTR Frame, when using ID 1 as code from HALCoGen. (see above)

But the Arbitration looks correct now...

Any Ideas why it is now a RTR Frame?

+1 jagadish gundavarapu over 2 years ago in reply to Roland Keller

TI__Guru 69811 points

Hi Roland,

What is the analyzer tool you are using?

Did you correctly configure the CAN ID length on tool side?

Thanks & regards,
Jagadish.

0 Roland Keller over 2 years ago in reply to jagadish gundavarapu

Prodigy 55 points

Hi Jagadish,

I accidently clicked on "This resolved my issue".

At the moment I am not shure, I thins the PCAN-VIEW is set to 11bit. bit there is definetely no difference from using ID1 to USING ID458 screenshot above.