Re: [libdc] Dual- & Quad-Core problems
Capture and control API for IIDC compliant cameras
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From: Stefan R. <st...@s5...> - 2010-02-11 16:56:57
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Damir Anicic wrote: > The COLOR one was connected with 3m cable, > B&W one with 0.5m cable, > and I got that black-images trouble, on COLOR camera only. > Camera-rest (with coriander or in my app) or dc1394_reset_bus did not help, > but disconnecting/reconnecting camera always helped. > > > Now, the COLOR one is on shorter cable, > B&W on longer, > and I did not get any problems (cold-booted 7 times - allways works). > > It must be a combination of cable length + camera type. > > It seems that firewire cabling is quite sensitive. Cables with the usual 4- or 6- or 9-pin FireWire plugs can be 4.5 meters (15 feet) long if they are properly built. But the devices and controller boards also should have a sane PCB layout, with short traces of equal length between PHY chip and each connector pin, otherwise even the best cables might give underwhelming results. In these regards, even FireWire 400 seems less forgiving than e.g. USB 2.0. (Or maybe it's just that people are more used to stability issues with USB than they are with FireWire.) -- Stefan Richter -=====-==-=- --=- -=-== http://arcgraph.de/sr/ |