W dniu 25.09.2012 o 09:46 Martin Patzak (GMX) <martin.pat...@gmx.de> pisze:
> I wonder, if someone managed to get a LinkUSB working stable on a raspi. > I tried different permutations of power-supply and hubs and was not yet > successful for a longer time period. > > My 1wire-net is stable for years now on the PC. I use a LinkUSB as > bus-master and run a powered network of about 15 temp-sensors and 2 > in/out-modules. I power the network with 5V of the PC power-supply. > > When I now move to the raspi everything works fine in the beginning. I > collect data every 30 seconds of all sensors. After a certain time - it > can be 1 to 3 hours - the raspi hangs itself up with smsc errors. > > There were hints on the raspi forum, that this might be a power supply > issue, but I could not confirm this. For now I started to use a lab > power supply set to 5.2V (5.0V measured on the TP on the raspi itself) > with a current limit set to 1.2A. The power usage of the raspi is at the > most 0.4A at 5V, and this is with the LinkUSB as the ONLY external > USB-device since I communicate to the raspi via SSH-shell. The lowest > power when idling is 0.35A at 5V. The 0.4 is seen when writing the data > to the rrd on the sd-card (for the moment). > > I use wheezy and keep it up to date, together with the packaged > owfs-2.8p15. > > I already tried two different powered USB-hubs and hooked the LinkUSB on > there - same result. I think there is a general usb driver problem on Raspi. Google the "Elephant in the room" topic on Raspi forum. I think there are some improvments. My 3G modem started to work after one of the updates but maybe winter will come before it's fixed for good. In the mean time You can use i2c<->1-wire converter. I don't know if anyone tested it extensively. You could also try to solder a wire to the polyfuse for the USB port. The new boards have those polyfuses replaced with 0 ohm resistors. -- p4trykx ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
