CAN is indeed a maximum 1Mbps, however about 50% of that is overhead, so the actual data bandwidth is more like a max of 500kbps. This is over a distance of something like 40 meters.
CAN only defines the physical connection and message frame format. All the bit stuffing, sync, acknowlegements and limited retransmits are handled in hardware, but your application has to process messages that arrive fast enough for your application. Nearly all CAN controllers implement message filtering in hardware as well, reducing the number of messages that your application has to process. There is a max of 8 bytes in a message frame. The hardware implementation is quite a bit more sophisticated than a UART. Andy Jon Elson wrote: > Rafael Skodlar wrote: > >> I would not want to rely on UDP for real time applications unless it's >> used on an isolated network with a limited number of well behaving >> nodes. > Yes, you would have to do it that way. > >> Gigabit ethernet would be better but then which microcontroller will be >> able to run with it? 32 bit only: >> http://www.freescale.com/webapp/sps/site/application.jsp?nodeId=0220502E112E1F >> > This gets quite expensive, at least for a while still. >> How about using some other bus for real time applications? I'm sure >> there is a better bus for the price (CAN?) > I think CAN is much slower, and the hardware support is at a > MUCH lower level. It isn't much more sophisticated than a UART, > thus software overhead. > > Jon > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > -- Andy PGP Key ID: 0x67090A54 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
