could be a similar problem:
Roberto Spadim wrote:
>
> what's your installation?
> computer - serial ow - ow network - ds18b20?
>
I'm using an ARM CPU and 1-Wire Busmaster for I2C and USB to establish 6
networks with about 40m length each.
computer - I²C DS2482-100 ow - ow network - 1xDS18B20+3xDS2408
- I²C DS2482-100 ow - ow network - 3xDS18B20
- I²C DS2482-100 ow - ow network - 3xDS18B20
- I²C DS2482-100 ow - ow network - 3xDS18B20
- USB DS9490R ow - ow network - 3xDS18B20
- USB DS9490R ow - ow network - 2xDS18B20
These networks work fine except the 6. with USB and only 2 devices. They
have the longest and worst cables and star topology.
I measured a capacity of about 5nF to one device and 5.9nF to the other.
Probably a solution would be to add a third DS9490R and connect only one
device to each adapter, but ther are not enough USB-ports, so an addition
USB-splitter would be needed.
Roberto Spadim wrote:
>
> i have some ARM devices and i don't know why my serial device stop working
> what i do is restart owhttp program and it return normal operation
> maybe we have a problem at automatic detection of serial devices
>
The above mentioned USB network simply stops responding after a random time
between 1 day and 6 days. All devices will be polled each 10s and this works
fine without any error (also not in the statistics) until the time comes and
the both devices connected to this network are not reachable anymore. All
other devices connected to the other 5 networks still works fine, even that
one with the 3 devices on the other USB never had any problem.
This behavior can be verified with owdir-tool and my self made owcapi
application.
A simple restart of the owserver will solve the problem. For the next days
it will work fine until it hangs again...
Maybe some error handling routine will be called very often for this network
and at some time some resources are gone which causes all devices attached
to this one network to be not reachable anymore.
Currently this only happens in a house which is far away, I can't access the
hardware for tests, so I'll try to recreate the problem within my lab.
Roberto Spadim wrote:
>
> another doubt... could we remove auto detection and hard configure a
> single device at console?
>
??? I don't understand your proposal, maybe this is directed to Paul :-)
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