RE: Remote frame transmission

You have to use the automatic transmission method.  The alternative is
to use the automatic transmission (code = 1010) with a 0-byte data
length and use its interrupt or status bit to trigger a routine to send
the data frame.  Of course this method means you will have sent two data
frames in response to the remote frame.
 
There are alternatives, but they are messy and could lead to missing
transmissions.  For instance, if you prevent the remote frame from
transmitting (disable the TX pin, may lead to internal bus errors,
prevents CAN from participating in any traffic or ACKs) and poll its
CODE field for 1110, that means the remote frame has been received. You
then cancel its transmission and set up a data frame in its place.  I've
never tried this and don't expect it could be used in a practical
system. 
 
- Allan


________________________________

From: [email protected] [mailto:[email protected]] On Behalf
Of prashanth_feb9
Sent: Saturday, March 31, 2007 12:37 AM
To: [email protected]
Subject: [MPC500] Remote frame transmission



Hello Everybody,

Is it possible to prepare and transmit a data frame in response to a
remote frame (not automatic transmission)? 

As per the MPC565 manual the remote frame is not stored in the receive
message buffer. How do I check whether a remote frame has been
received so that I can prepare the response data frame and send it? 

Thanks in advance

-Prashanth



 


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