LP-MSPM0G3507: Unable to set MCAN arbitration bit rate to 1Mbps

William Moyne

Part Number: LP-MSPM0G3507
Other Parts Discussed in Thread: SYSCONFIG,

I'm using SDK 0.58 to configure two LP-MSPM0G3507 boards using the tx and rx example firmware. When in sysconfig, the "Desired Arbitration Rate (kbits/sec)" for the MCAN peripheral will not enable "1000" as an entry. It says "Must be in the range of 1 to 999"

1Mbps arbitration is supported in the CAN-FD spec and seems like it would be a popular value for high-bandwidth applications.

If it's just a sysconfig limitation, can you give me the settings needed in the entry boxes and I can turn off the autocalc feature. I'm using the 48MHz oscillator as the CAN clock.

Thanks!

11 months ago

0 William Moyne 11 months ago

Prodigy 60 points

I used:

NBRP	0
NTSEG1 Tq	40
NTSEG2 Tq	5
NSJW Tq	5

Using the formula from sysconfig this gives:

Bit Rate = 48MHz / ( (40+1)+(5+1)+1 ) = 48MHz/48 = 1MHz

This seems to work, but I wonder why the sysconfig tool will not compute this automatically.

+1 Luke Ledbetter 11 months ago in reply to William Moyne

TI__Genius 17490 points

Hi William,

It seems to be an old check on Sysconfig, I'll input it to be fixed for a future patch. I would continue manual input of the Arbitration Bit Timing Parameters until this can get addressed.

Regards,

Luke

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LP-MSPM0G3507: Unable to set MCAN arbitration bit rate to 1Mbps