Daniel Schnell wrote:
roland Tollenaar wrote:
What baffles me a bit then is that the behavior cannot be classified
as very "Real-Time" can it?
Real-Time does mean the system reacts in time. There is nothing a
software can do if the hardware is not meeting your requirements of
beeing in time. Having reliable 0.5 ms real-time is e.g. for us
absolutely real-time and we chose carefully our hardware components that
this will never be exceeded. For us Xenomai and RTCAN on a MPC5200B
platform do a good job.
I cannot imagine that the developers of
rt-can overlooked this. I doubt that it will be possible to run a
discrete state-space controller successfully on a platform that
juggles around its period-times as badly as I am experiencing. And I
still need to read discrete IO and write DIO and AIO to another CAN
node which is not yet even connected.
Choose your hardware carefully. Parallel port CANS are certainly much
slower than e.g. PCI adapters. On a Laptop you have the possibility to
add e.g. PCCARD CAN. But before purchasing I would check how these are
supported and which typical access times you can expect. USB CAN is
certainly even slower, so this will be no option.
To confirm that, the PCAN dongle is a nice cheap device for low CAN
speeds but not appropriate for 1MB/s. Please ask PEAK for more detailed
information (e.g. [EMAIL PROTECTED]).
Wolfgang.
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