TMS320F2800137: The CAN baud rate register cannot be written

Ben Qin

Part Number: TMS320F2800137
Other Parts Discussed in Thread: C2000WARE

Hi Team,

There's an issue from the customer need your help:

The development version I am using is the CCS12 version. The demo board on the official website is used. Operate according to the routine provided by the official website. After initializingthe chip and GPIO pins, configure the CAN module and find that the CAN_BTRregister cannot be written. The CAN_CTL register cannot and some bits cannot be operated, such as the CCE bit, which should be called in the CAN_initModule() function. I thought it was because the CAN clock could not be configured, but after Device_init(), you can see that theCAN peripheral clock has been turned on. Another one is that, after trying, direct operation of CAN_BTR cannot be operated

Customer uses F280049, the same process, you can initialize CAN, you can also use the CAN_BTR register; all, he suspects that there is a problem with the Decive_Init() function of F2800137.

Could you help check this case?

Thanks & Regards,

Ben

over 2 years ago

0 Joseph Casuga over 2 years ago

TI__Mastermind 40140 points

Hi Ben,

Thanks for initially confirming that the CAN clock enable bit is set. Seems like the code is not referencing the correct CAN preipheral address. Can you check with customer if writes to those CAN registers in CCS Register view is successful? Also, is the code devloped by the customer or using the C2000Ware examples and if so, what i the particular example the the customer used?

I've been running CAN codes from C2000Ware and I am able to write to CAN registers.

Thanks,

Joseph

0 Ben Qin over 2 years ago in reply to Joseph Casuga

TI__Intellectual 2690 points

Hi Joseph,

Joseph Casuga said:
Seems like the code is not referencing the correct CAN preipheral address. Can you check with customer if writes to those CAN registers in CCS Register view is successful?

Parts of them can be written. Such as CAN_CTL.

Joseph Casuga said:
Also, is the code devloped by the customer or using the C2000Ware examples and if so, what i the particular example the the customer used?

It's C2000Ware examples. He tried every example.

Best Regards,

Ben

+1 Joseph Casuga over 2 years ago in reply to Ben Qin

TI__Mastermind 40140 points

Hi Ben,

Sorry for the delayed response. I was able to duplicate the issue and reported the finding to our SW team. The issue is that the CCS register view is not reflecting the correct address for CAN registers. The CAN bit timimg register (CAN_BTR) at address 0x4800C is actually updated with the correct CAN bit timing parameters however the register view is showing all 00's.

For now, recommend to customer to temporarily use CCS memory viewer using the CAN base address (0x48000) and the x16 register offsets to view specific CAN register values while the CCS register view will be fixed in the next revision of C2000Ware.

Best regards,

Joseph

+1 Siddharth Deshpande over 2 years ago in reply to Joseph Casuga

TI__Mastermind 36755 points

Hi Ben,

As Joseph mentioned , the xml for CAN reigster has incorrect offsets. Pls try using the attached one, /cfs-file/__key/communityserver-discussions-components-files/171/f280013x_5F00_can_5F00_regs.xml

This file has to be placed in the <CCSInstallDir>\ccs\ccs_base\common\targetdb\Modules\C2000 folder.

This will be fixed in the next revision of CCS.

Best Regards

Siddharth

0 Ben Qin over 2 years ago in reply to Siddharth Deshpande

TI__Intellectual 2690 points

Hi Joseph and Siddharth,

Thanks for your help.

In other words, this is a problem with the C2000Ware software. In fact, the _BTR register of CAN has been configured, that is, the baud rate of CAN communication has been configured. Right?

Thanks & Regards,

Ben

+1 Siddharth Deshpande over 2 years ago in reply to Ben Qin

TI__Mastermind 36755 points

Ben,

There is no problem with the C2000Ware , it is a problem with the CCS register view. It is configuring the register but it is not displayed/updated in the CCS register view correctly..

Did you can try using the updated xml file for CAN with correct offsets?

Best Regards

Siddharth

0 Ben Qin over 2 years ago in reply to Siddharth Deshpande

TI__Intellectual 2690 points

Hi Siddharth,

Issue resolved. The register view displayed normally.

Thanks & Regards,

Ben

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TMS320F2800137: The CAN baud rate register cannot be written