Roland Tollenaar wrote: > Hi, >>> >>> Has a rt_nemesis driver been written? >> >> None that I'm aware of. What's the related Linux driver's name? > Simply nemesis if I am not mistaken. Found the link in > /sys/...../driver->nemesis and lsmod | grep "nemesis" confirmed the > existence of such a module. I would never have guessed.
A full-text search over 2.6.21 didn't show me which source file is involved here. :-/ > >> >>> If not, how impossible is it to create one? >> >> Rarely impossible, only few hardware is so weird that you cannot >> convince it to send/receive deterministically given a non-chaotic >> network (like RTmac/TDMA, Ethercat, or other RT protocols ensure). > Sounds difficult if one has little experience with this. I am just > starting to read your paper "RTnet-A flexible Hard Real-Time Networking > Framework" so you can imagine that I am probably not quite up to the task. > > The intention was to set up a slave to test the rtnet installation which > works in loopback mode. To my surprise the laptop I was going to set up > as slave did not have a realtek chip. Goes to show how deceptive casings > can be it looks identical to my master laptop which does have a 8139 > chip. :) How reliable is the loopback test advised in the documentation > as an indication that rtnet is working perfectly? (The rtping test) You should be able to test a look for your specific scenario. I wonder if EML against the rtlo device wouldn't be much like an empty Ethercat bus. So you should be able to test the elementary cycle - though without process data transfer... > > I am in the process of getting EML running (well I have it compiled and > installed but have not incorporated it in my code yet.) I was wondering > how rtnet awaits its slave response from an Ethercat slave? Sorry about > the newbie question feel free not to answer it ;) Ethercat forms a ring: The master sends out a frame that is handled on-the-fly by the slaves as it passes through them. That frame arrives back at the RX line of the master's NIC and is thus received just like a frame sent by some peer node in a normal Ethernet. Jan
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