On Thursday 09 June 2005 04:33 am, Jan Kandziora wrote: > Am Mittwoch, 8. Juni 2005 23:12 schrieb Alfille, Paul H.,M.D.: > > You are absolutely welcome to participate. > > Then I'm happy to go on the bug-hunt. > > Anyway, for my project I need an automation framework (not a GUI, just a > library) for 1-wire devices and Linux, with some things owfs itself doesn't > address, e.g. timers or grouping of 1-wire chips to "devices" - the goal > here is to uniquely identify "devices" instead of single chips and thus, > allow plug'n'work. I want to develop this in Tcl (that's why I'm after the > binding). > > I don't know if you are interested in such a framework - it's a little off > the scope. >
You are addressing a more general problem, aggregates of 1-wire devices. There are a few known sensors, like the pressure sensor, that use more than one device to make a larger circuit. The problem is that unless there is a standard way (perhaps in device ROM) for the devices to autoorganize, you need outside information. This is nothing new, you need outside information to know which device is the rooftop temperature vs the server temp. Most approaches have been to add a layer on top of OWFS -- perhaps by filesystem links to better filenames, or a database. If you have a more general method or design, I'd be interested. > > 1. MIPS works. Christian Magnusson is the wizard at porting. > > Great. I'll try out as soon the hardware arrives. > > > 2. Slaves using owserver is the intended design. > > We don't currently implement adding/removing owservers sources while the > > owfs (or whatever) process is running, but there is nothing in the > > underlying design that would prevent it. We'd just have to ponder what > > the communication channel to the master should be for these events. > > I'd expect the owtcl client to throw an error if the server is not > reachable. Am I correct? In that case, the automation framework could try > to reconnect every 10s or the like. > > > 3. Timing is really 1-wire bus limited. OWFS is straight C code, and > > TCP/IP is small single packets. I'll test the timing if you wish -- what > > devices where you considering? > > ^^; I thought you already have that data, as this is the first question I'd > expect about any automation system. But Ok, I can measure it myself, too, > no hassle. > > > 4. TCL doesn't use SWIG, I believe. > > Serg Oskin is the TCL implementer, and has been very active is fixing any > > problems. > > Ok, I will ask him on Tcl issues. The first thing on my nails is: > > > BUGS > Simultaneous work of several connections is not supported. > You can certainly aggregate several owservers. All the packages use the same underlying owlib that has multiple data sources built in. The only question is whether you can pass all their names on the "command line" -- the invoking call. It is probably better design to "aggregate" to a local owserver, and then use that owserver for all the TCL calls. That allows more than one process to talk to the devices, and probably reduces startup times. > > I really need multiple simultaneous connections for my application - who > doesn't? Is this a limitation of owlib (global data structures) or simply a > limitation in the owtcl wrapper? I would start with this bug if someone > guides me. > > Kind regards > > Jan > > > ------------------------------------------------------- > This SF.Net email is sponsored by: NEC IT Guy Games. How far can you > shotput a projector? How fast can you ride your desk chair down the office > luge track? If you want to score the big prize, get to know the little guy. > Play to win an NEC 61" plasma display: http://www.necitguy.com/?r=20 > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------- This SF.Net email is sponsored by: NEC IT Guy Games. How far can you shotput a projector? How fast can you ride your desk chair down the office luge track? If you want to score the big prize, get to know the little guy. Play to win an NEC 61" plasma display: http://www.necitguy.com/?r=20 _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
