TMS570LS1224: 250 kbit/s and 125kbit/s baud rate is not working on CAN interface

Keno

Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN

Dear Support,

I tried to set the baud rate to 125 kbit/s and 250 kbit/s but it doesn't work (I was able to use CAN interface 500 kbit/s and 1Mbit/s). I observed that the TMS sends couple good message in the beginning but after this it sends error frames only. I'm using SN65HVD230D CAN transceiver. I tried several bit timing setup but none of them is working. Here is my bit timing configuration:

canREG2 ->BTR = (uint32)((uint32)0U << 16U) |

(uint32)((uint32)(7U - 1U) << 12U) |
(uint32)((uint32)((1U + 7U) - 1U) << 8U) |
(uint32)((uint32)(4U - 1U) << 6U) |
(uint32)19U;

Setup in the CanKing software:

Can you help me to solve this problem?

Thank you!

Kind regards,

Keno

over 7 years ago

0 Chuck Davenport over 7 years ago

TI__Guru 59540 points

Hello Kino,

I will have to check on this. I know that we have mil;ions of hours logged at 125kBps as this is the baud rate we use for our power-temperature cycling and we have also done this using 250kBps. If you could post your halcogen project files (.hcg and .dll files) i can double check them based on your clock settings.

Is it possible for you to measure the minimum pulse width you are seeing on the CAN bus? This may provide some clues about what might be happening.

0 Keno over 7 years ago in reply to Chuck Davenport

Intellectual 550 points

Hello Chuck,

Thank you for your reply. I attached everything what you asked from me. In the Halcogen project, please check the configuration of the CAN1 channel. That is the relevant, not the CAN2. Thank you!

Kind regards,

Keno2548.CAN_Support.zip

0 Keno over 7 years ago in reply to Keno

Intellectual 550 points

Hello Chuck,

Could you find anything? Thank you!

Kind regards,
Keno

0 Keno over 7 years ago in reply to Keno

Intellectual 550 points

Hello Chuck,

Please give me some information. This problem is holding back our project. Thank you!

Kind regards,
Keno

0 NeilBerry_at_Parker over 7 years ago in reply to Keno

Expert 1995 points

I had a problem last year, where the baud rate changes were not acting as expected. It was because my build and compiler settings and my choice of library was not right.

0 Keno over 7 years ago in reply to NeilBerry_at_Parker

Intellectual 550 points

Hello,

Thank you for your reply. Can you give me more details, please? What settings were wrong exactly? What kind of library did you use? How did you solve the problem? Thank you!

Kind regards,
Keno

0 NeilBerry_at_Parker over 7 years ago in reply to Keno

Expert 1995 points

I had a build project that was targeted towards a RM48, but the hardware was actually RM46. It was able to interact with CAN, but only successfully at one baud rate. Changes to the baud setting did not have the desired effect.

I was working on a RM46. Starting with a fresh RM46 project (and using the correct Runtime Support Library and correct device variant selection) allowed me to change baud settings.

I use CCS, so those settings are in the property sheet dialog under [CCS General] settings.

0 Keno over 7 years ago in reply to NeilBerry_at_Parker

Intellectual 550 points

I don't use any libraries at the moment, I generate my configuration with HalCoGen. Actually I found the problem. On our board there are two transceiver on the same CAN bus. These transceivers connect to the TMS and a PIC controller. When I changed the baudrate in TMS I forgot to change the baudrate in the PIC and it caused this problem.

0 Chuck Davenport over 7 years ago in reply to Keno

TI__Guru 59540 points

Keno,

I sincerely apologize for not getting back to you and I am glad that you were able to track down the issue.

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TMS570LS1224: 250 kbit/s and 125kbit/s baud rate is not working on CAN interface