Vareka, Bill wrote:
> I'm new to RTnet (using LXRT exclusively for now) and trying to figure out
> the new TDMA v2 structure. Within each cycle, each participant must be
> assigned at least one slot and slot 0 is the default RT slot and slot 1 (if
> present) is the default NRT slot. The readme file (tdma.spec) states that
> "a user or service ... explicitly provides the desired slot ID". How? I've
> looked through the code and can't find how this is done. Then, the example
> in the readme file shows slave A using slot 0 (RT/NRT) and slot 2 (RT),
> slave B uses slot 0 (RT) and slot 1 (NRT). This agrees with the statement
> that slot 1 is NRT if present otherwise slot 0 is both RT and NRT. But then
> slave C is defined as useing slot 0 (RT/NRT), slot 2 (NRT) and slot 3 (RT).
> For slot 2 to be a NRT slot, there must be some mechanism to link it to the
> RTmac outside of the conf file. How is this done? Sorry if these seem like
> dumb questions but all I really need is a pointer to the right place in the
> code or a quick overview. Unfortunately, all of the examples define how you
> 'use' RTnet and none help explain the options you have for setting it up.
> Of course, that's hard to do given that everyone's network is different.
>
Yea, the old problem: development was faster than documentation. The
information you are looking for is hidden inside the socket priority
field. Use
ioctl_rt(socket, RTNET_RTIOC_PRIORITY, &prio);
to set this value for an open socket. The lower 16 bits still encode the
transmission priority while the upper 16 bit describe the "channel",
i.e. the slot number (0..n) in case of RTmac+TDMA.
I just noticed that the user API (rtnet.h) is unfortunately lacking some
macro to build a socket priority value from both parameter, will fix
this before the next release.
For system services like RTcfg or ICMP, you will find defines for the
socket prio value to be used in the RTnet source code. These services
use fixed values, no runtime reconfiguration available yet (would be
straightforward to implement, though).
Jan
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