TMS570 CAN bit rate calculation

Luffy Li

Other Parts Discussed in Thread: HALCOGEN

Hi, everyone,

We’ve met a problem in TMS570 CAN bit rate calculation, could you help me to check it? Thanks!

As we all know, the Prop_Seg, which is part of the bit time, depends on the delay of driver ,the delay of the receive circuit and the delay of driver line.

In my opinion, the delay of bus driver and the receive circuit depends on the application system, as the TMS570 TRM in page 889 shows as below

“Its length depends on the delay times measured in the system”

Is this right? If not, how to check the delays? Is there an easy way to estimate the delay so that we can flexibly change the CAN bit rate in the program? With HAL Code Generator, we can easily calculate the bit rate, and how does it get the delays of bus driver and the receive circuit?

Thanks!

over 13 years ago

0 Brian Fortman over 13 years ago

TI__Expert 7650 points

Hi Luffy,

Thanks for your question. We have forwarded your request on to one of our experts in the area.

0 Haixiao Weng over 13 years ago in reply to Brian Fortman

TI__Genius 13810 points

Here is the answer from our HalCoGen owner. I am going to post it and close the thread:

"The physical delay in the Propagation delay is application specific. The default value in HALCoGen is just an example calculated for a certain transceiver. The customer should figure out and reflects the physical delay on the CAN network including transceivers etc.."

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TMS570 CAN bit rate calculation