Bret Yen-Ting Lin wrote:
Hi Jan
The RTmac/TDMA seems to be working now, though I am not entirely sure what fixed it .. All I did it play around with the TDMA_CYCLE in the rtnet.conf
Probably you picked a too short period in your first experiments. Everything below 1 ms needs special care and adequate performance of the stations.
file. I am glad it is working as expected.. however I am not sure how to use Rtnet and TDMA especially. Is there any documentation in how to use the API ?
I understand there are examples but maybe what I am looking for is all the available APIs/functions that I may use. Most of the examples have little comments and is not really making clear of how each function is used and related...
Well, the old topic. We still don't have such an overview (hacking already takes a lot of time...). However, I'm just working on slides about the API for our developer meeting. They will be published afterwards, but I can send you a preview soon.
For the RTmac/TDMA, do i send packets as a real-time task or user space ?
You can send packets both from kernel and user space (LXRT), but the context should be real-time.
and which example would be the best user guide?
All demos in /examples run both with and without RTmac/TDMA. Those in /rtmac/examples (or /examples/rtmac in 0.7.0-testX) are used to demonstrate the RTmac behaviour (delays due to the cyclic nature) and its features (time stamping, sync on start of frame).
If you want to send UDP messages, take a look at frag_ip or round_trip_time, for Ethernet packets, examine raw_packets.
p.s. what does rtmac/example/mrtt , Event, and rtt stands for ? this might aid me in interpreting some of the variable used.
rtt = round trip time (peer-to-peer) mrtt = multiple rtt (one client to many servers, use server from rtt) event = compare distributed time stamps of asynchronous external event (generated by serial or parallel port)
Jan
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