Am Dienstag, 21. Juni 2005 08:43 schrieb Christian Magnusson:
> I have actually also noticed some of those problems too... I have one
> of my LCD-displays in my office very close to the lamp-switch, and
> sometimes owserver has hanged at the same time as I entered the room
> and switched on the lamp and just walked through the room to get a
> screwdriver or something else. The 1-wire bus is connected to my uClinux
> board in the office too, so I have had those thoughts for some time
> that it has to be some connection between the EMC and the 1-wire
> bus stability.
>
I'm glad I'm not the only person who encountered this kind of error. I just
thought I will either lose my credibility or my mind.
> I have never needed to remove the power supply to the 1-wire adapter
> when the problem has occurred. I have just needed to restart owserver
> and I had plans to do this automatically for a long time.
>
Yes, same for me. But it takes about 2 seconds to detect a failed owserver and
to restart it - for local owserver. For remote owserver, things are even
worse. It would be far better owserver wouldn't fail in this situation, but
just re-initialize, maybe only the 1-wire, to get rid of the problem.
> It would be nice if you could look in the /bus.0/statistics/errors
> and see where the errors increase when you have problem next time.
> (Either from owhttp or owfs and connect to the failing owserver)
>
> When I have had problems, it's usually DS2480_reset_errors which
> increase every time I try to read something on the 1-wire bus.
>
Ok, I will do this in the evening.
> I think it would be safe to add a re-initialization of the 1-wire
> adapter when some of those errors occur:
>
> DS2480_reset_errors
> DS9097_reset_errors
> DS9490_reset_errors
> (and perhaps if DS2480_read_timeout is large I think...)
>
> if(DS2480_reset_errors || DS9097_reset_errors || DS9490_reset_errors) {
> COM_close(in);
> usleep(100000);
> COM_open(in);
> if ( DS2480_detect(in) ) {
> if ( DS9097_detect(in) ) {
> ret = -ENODEV;
> }
> }
> }
>
> Something like this would probably be enough to make a reset of the
> adapter when the 1-wire bus fails.
>
I'm willing to dig into owlib to make up the necessary functions if someone
guides me. Then I can try out if it helps.
Kind regards
Jan
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