FlexCAN RTR transmit buffer CODE 1010 message problem.

Ushnek — Tue, 11 Jun 2013 11:02:15 GMT

Hi All,

In the iMX53 reference manual(iMX53RM.pdf), I find the table 34-5 that says Tx message buffer

can be put-in messages in advance with CODE 1010.

However, there seems like no solution let user to transmit this kind of message?

I use "cansend" but not find any option for sending this kind of message.

Could someone help me to know how to send this?

Re: FlexCAN RTR transmit buffer CODE 1010 message problem.

ioseph_martinez — Wed, 21 Aug 2013 19:34:14 GMT

Hello Ushnek,

I did a review on the documentation Documentation/networking/can.txt

This section explains a bit about scope of the driver:

6.3 CAN controller hardware filters

To reduce the interrupt load on deep embedded systems some CAN

controllers support the filtering of CAN IDs or ranges of CAN IDs.

These hardware filter capabilities vary from controller to

controller and have to be identified as not feasible in a multi-user

networking approach. The use of the very controller specific

hardware filters could make sense in a very dedicated use-case, as a

filter on driver level would affect all users in the multi-user

system. The high efficient filter sets inside the PF_CAN core allow

to set different multiple filters for each socket separately.

Therefore the use of hardware filters goes to the category 'handmade

tuning on deep embedded systems'. The author is running a MPC603e

@133MHz with four SJA1000 CAN controllers from 2002 under heavy bus

load without any problems ...

Unfortunately that feature does not seems to be supported, so you won't be able to use it without modifying your driver.

You will need to study the driver code and add this feature by yourself. I guess you need to weight how much you can win in performance vs the standard usage.

Best Regards,

Ioseph

Re: FlexCAN RTR transmit buffer CODE 1010 message problem.

YixingKong — Fri, 23 Aug 2013 06:58:13 GMT

Ushnek, please click Correct Answer/Helpful Answer, if your question has been answered.

Regards,

Yixing

topic Re: FlexCAN RTR transmit buffer CODE 1010 message problem. in i.MX Processors

FlexCAN RTR transmit buffer CODE 1010 message problem.

Re: FlexCAN RTR transmit buffer CODE 1010 message problem.

Re: FlexCAN RTR transmit buffer CODE 1010 message problem.