AM335X DCAN buffer?

justin wang1

Expert 1085 points

Does AM335X DCAN have the rx FIFO buffer??

as following figure

If the deviceB sends Canbus packets to AM335X per 1ms

and AM335X is running to other process

Is it possible to lose data??

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi,

The AM335X DCAN peripheral has a message RAM, which can hold up to 64 message objects. Complete description of the DCAN peripheral can be found in the AM335X TRM Rev. K, section 23.

0 Bob Koen over 10 years ago in reply to Biser Gatchev-XID

Intellectual 445 points

The default driver in drivers/net/can/c_can sets up a FIFO of 16 message objects for receiving CAN frames. Why it only uses 16 message objects is a mystery but it *should* be enough to ensure that you aren't missing CAN frames.

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AM335X DCAN buffer?