Kate Alhola wrote: > Is it possible to use RTnet without specially ported network drivers > and routing trafick via standard Linux network driver ?
Nope, that is not possible ATM. [I may become feasible in the far future when PREEMPT_RT matured and netchannels or something similar materialised and we make use of it.] > In my mind something like using RTmac and rt_loobback drivers > or is there siome other way ? No, this has nothing to do with it. The rt_loopback driver provides a RTnet-internal loop. And RTmac is the framework to add software-based media access control to RTnet's NIC drivers. > > I understand that TDMA and hardest real time is lost but > at the moment, my target is just get 1ms cyckle time > from RTAI. My goal is just use microcontroller as > I/O module for RTAI. Hard RT has nothing to do with 1 ms vs. 0.1 ms or whatever. It's about if you can tolerate deadline misses or not. Even a 1 ms loop can already be stressing for a loaded low-end processors. So, do you have hard requirements to meet your 1-ms deadline? Jan PS: Just read your RTAI posting: Don't assume user-mode==non-RT. Execution context (RT/non-RT) and mode (kernel/user) are orthogonal. In fact, hardly anyone should start new RT application designs in kernel space today.
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