On Mon, 2005-01-24 at 13:59 -0500, Mbosowo I Sampson wrote: > I'm in the process of sifting through USBSnoop generated logs for the HP > 3970, trying to decipher what's going on. I've hit a little bit of > a wall. Reading the code for the hp5400 driver along with the USBSnoop > logs posted at http://home.kabelfoon.nl/~bertrik/plugin_hp5470c.log > has really helped a lot. I would like to start writing my driver but I > need some advice. > > This is the log generated from my scanner after its plugged in: > http://www.ic.sunysb.edu/Stu/msampson/usbsnoop_pluggedin2.log > > The first 4 URB transfers are easy, querying the device, choosing a > configuration, etc... But after that it gets a little murky. I'm > looking at the packets going down, and coming up, and I just have no way > to telling what's doing what. I wanted to use usb-robot to send commands > one at a time, but the program segfaults on my machine (debian sarge > 2.6.10) > > I have the USB1.1 spec handy, so I understand the structure of the > packets, but how do you discern what the packets are doing? For example, > Which of those packets turns on the lamp? Which ones controls the stepper > motors? Should I just start from the top of the log and send the commands > myself to see what happens? I'm really itching to get this thing working. > > I would love to disassemble the windows driver, but I have no experience > doing this. I was hoping to tap the collective experience of the group > before I tried that. > > Any help would be much appreciated. > > Mboso >
Have you thought about to try to join the rt88xx backend people. There will be differences between the scanner chips but maybe not so great. http://hp44x0backend.sourceforge.net/ If you compare some usb-sniff output some parts can be the same? -- -------- m.vr.gr. Gerard Klaver
