I agree... 3 attempts are perhaps not necessary. If it fails it should only be necessary to try 1 attempt and then return "read-error", since it's not possible to retry the old on-going operation anyway.
I tried to start owserver to /dev/ttyS0 and then launch minicom on /dev/ttyS0 too. This will trig the read errors at once since minicom set the speed to 19200 baud and they will probably grab some chars each... :) When minicom exits everything initialize and owserver works again. I noticed one bug with oldSerialTio on COM_open() which should be separate for each serial port though. /Christian On Mon, 2005-06-27 at 18:40 -0400, Alfille, Paul H.,M.D. wrote: > Nice changes, Christian. > > I'm a little worried about burning CPU cycles if the adapter is unplugged. We > will aggressively try to reconnect. > > I notice you make 3 attempts at reconnecting each time. That will be > multiplied > by the 3 attempts ar read/write. > > Would there be any harm in a delay before the 2nd and third reconnect > attempt? 1 > second? I suppose we could also allow a command line parameter to change that > value for embedded systems where precisely tuning delays and utilization is > important. Jan can offer some feedback on this. > > Paul > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of > Christian Magnusson > Sent: Monday, June 27, 2005 7:18 AM > To: owfs-developers@lists.sourceforge.net > Cc: [EMAIL PROTECTED] > Subject: Re: [Owfs-developers] More on "Hanging" Problems > > > > Try the latest cvs again... I have fixed a missing > usb_release_interface() and some other statistics from those errors. > > /Christian > > > On Mon, 2005-06-27 at 11:34 +0200, Jan Kandziora wrote: > > Am Montag, 27. Juni 2005 05:26 schrieb Gregg C Levine: > > > Hello from Gregg C Levine > > > Paul, explain this phrase in better detail please: > > > "In any case, it's great that Jan has a setup where he can > > > consistently trigger the errors." In an embedded an environment it is > > > sometimes considered desirable to stress test the file system by > > > triggering power cycles. There's an article on that, and the methods > > > used somewhere on the Linux-MTD site. > > > > > What I do isn't stress-testing. That would mean to get parameters when some > > component will probably fail and has to be replaced. That's not what I'm > > after, at least at the moment. > > > > I just ran into that failure - it makes 1-wire completely unusable for my > > application. > > > > > > > Now I can see for myself how a rigged system would be desirable for > > > stress testing the file system that we've created. But a detailed > > > explanation would be good thing. > > > > > > Jan, what are you running? Which distribution? What is the hardware > > > configuration? I walked into this meeting late, and left my agenda and > > > most of my notes in a different location. > > > > > I'm designing a semiautomatic vending machine with a lot of attached > > devices > > (flow-rate sensors and solenoid driven valves), most of them in a ten-meter > > range around the machine, but some of them about 100m far away. The > > computer > > which will be built into this will be a MIPS based embedded board, which > > isn't completed yet. > > > > The computer I use to test is a Gene6310 "embedded" (more like barebone) PC > > board. Its i386-family based. This computer is working and would be used as > > a > > backup solution, if the MIPS board is not completed in time. > > > > I have a testbench, where I can arrange the devices like they were already > > put into that vending machine. I hooked up the 1-wire to USB via a > > off-the-shelf DS9490 adapter to the barebone. There is a mains transformer > > 230/24V~ 150W (completely passive, not a switching one), which is the power > > supply for the sensors and solenoids. The actual transformer for the > > machine > > will be a 400W type, which makes things even worse. > > > > This mains transformer generates some kind of EMC when switching it "ON" or > > "OFF" with an ordinary 230V switch. This is understandable if the switching > > happens outside of the zero-cross of voltage (ON-switching) or current > > (OFF- > > switching). The EMC pulse causes either the USB or the 1-wire (or both) to > > disconnect - which leads owfs into an unusable state. > > > > I'm pretty sure I can minimize this EMC by putting a zero-cross and > > snubbing > > circuit into my transformer - but I'm very unsure other appliances in the > > pub > > or gas station where the vending machines will be mounted are so kind. > > > > That's why I think we have to be able to recover from this error > > automatically. > > > > Kind regards > > > > Jan > > > -- > Christian Magnusson <[EMAIL PROTECTED]> > > > > ------------------------------------------------------- > SF.Net email is sponsored by: Discover Easy Linux Migration Strategies > from IBM. Find simple to follow Roadmaps, straightforward articles, > informative Webcasts and more! Get everything you need to get up to > speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > ------------------------------------------------------- > SF.Net email is sponsored by: Discover Easy Linux Migration Strategies > from IBM. Find simple to follow Roadmaps, straightforward articles, > informative Webcasts and more! Get everything you need to get up to > speed, fast. http://ads.osdn.com/?ad_idt77&alloc_id492&opÌk > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers -- Christian Magnusson <[EMAIL PROTECTED]> ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_idt77&alloc_id492&op=click _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
