TMS320F28377S: Canbus: reading back your own message in normal can mode.

Hi Ernst,

I think your only options monitoring in CANBUS would be to use an interface like PCAN that reads all transactions in the CANBUS, or connect a scope (to CANL and CANH lines) capable of receiving CAN frames.  Also wanted to understand what you are trying to accomplish by looking at the CANBUS message - maybe there are some alternative ways to do that instead of monitoring the CANBUS itself.

Best regards,

Joseph 

Hi,

1. I like to know how much time it takes to send a can message till it received. So I can compensate for that.

2. I have a tiny multi-tasking realtime OS of running on it. One process it a pcan like debug tool. Because you can't always connect an external tool.

  It is a bit awkward to reroute the data from both processes in the can driver.basicly  Rewriting the mailbox concept again in software.

 So the only sollution I can think of is to connect both can interfaces to the same bus.

Hi Ernst,

Ok, so that basically eliminates using PCAN or a scope since you need a real time feedback.  How about using the other CAN module of  the F28377S as the receiving node and one of the 3 CPU Timers to initiate the timing?  For example, as soon as you send data for transmission on CANA, start the CPU Timer and upon reception of that same message on CANB, read the elapsed time from the CPU Timer.

Regards,

Joseph