CAN Pakets Lost

Lorenz Gruebler

Other Parts Discussed in Thread: TMS570LS3137

Hello,

I am trying to get the CAN Bus of a TMS570LS3137CZWT running properly.

Therefore I've connected two TMS570LS3137 together, where I've wired CAN1 and CAN2 like a crossbar. Now I am sending packet’s with a counting variable and 1 Mbit speed on each controller and check proper reception with the second controller board. I want to know if my CAN driver is working properly.

I’ve noticed that about 0.05% of the packets are dropped (I am not sure at the moment if these packets aren’t sent or aren’t received)

Now I’am in concerned If my CAN System is affected by errata VIM#27.

GCLK is 180 MHz, VCLKA1 is 16MHz , VCLK1 is 90MHz, VCLK2 is 90MHz, VCLK3 is 36MHz

Regards,

Lorenz

over 12 years ago

0 Chuck Davenport over 12 years ago

TI__Guru 59540 points

Hello Lorenz,

I reviewed errata VIM#27 and this shouldn't be an issue for you since VCLK1 is GCLK/2. However, you could check to see if the phantom interrupt is ever taken. If it is, then check the VIM Status register to identify the source of the phantom interrupt.

Another factor could be your setup. When running at a baud rate of 1Mbit per second, you need to make sure all proper terminators are in place and that the cabling is a twisted pair. This helps eleviate bus errors that may be leading to dropped messages.

0 Lorenz Gruebler over 12 years ago in reply to Chuck Davenport

Expert 1075 points

Hello Dave,

thank you for your Answer

Lorenz

0 Chuck Davenport over 12 years ago in reply to Lorenz Gruebler

TI__Guru 59540 points

Hello Lorenz,

Please let us know if this has helped you resolve your issue. If, so, please verify the answer so the thread may be closed. If not, let us know if there is any other way we can be of assistance.

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CAN Pakets Lost