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101 wiersze
4.3 KiB
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<!-- received="Sat Apr 10 17:43:24 1999 PDT" -->
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<!-- sent="Sat, 10 Apr 1999 18:56:09 -0600 (MDT)" -->
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<!-- name="martica@martica.org" -->
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<!-- subject="Relisys Backend devel snags -- lockup when scanner buffer fills" -->
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<title>sane-devel: Relisys Backend devel snags -- lockup when scanner buffer fills</title>
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<h1>Relisys Backend devel snags -- lockup when scanner buffer fills</h1>
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<a href="mailto:martica@martica.org"><i>martica@martica.org</i></a><br>
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<i>Sat, 10 Apr 1999 18:56:09 -0600 (MDT)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#173">[ date ]</a><a href="index.html#173">[ thread ]</a><a href="subject.html#173">[ subject ]</a><a href="author.html#173">[ author ]</a>
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<li> <b>Next message:</b> <a href="0174.html">Larry Snyder: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<li> <b>Previous message:</b> <a href="0172.html">Hugo van der Kooij: "Re: updated RPM packages"</a>
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</ul>
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Howdy all,<br>
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<p>
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I've been working on the backend for the Relisys/Teco lines, and have<br>
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got things working pretty darn good for 24bit color scans at low<br>
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resolutions.<br>
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<p>
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PROBLEM: Scanner pauses scanning when buffer fills and machine locks<br>
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after almost emptying the buffer.<br>
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<p>
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I've run into some sort of problem, which I think is somehow scsi<br>
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related. When I scan at a high resolution the scanners internal buffer<br>
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fills faster than I can read the data out of it. I could try to increase<br>
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the sg buffer size, but I don't think that that is really a solution and<br>
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the problem will still exist with high res scans of the entire flatbed<br>
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area. <br>
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<p>
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When scanner under the Windows twain driver the scanner will pause<br>
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scanning when its buffer fills and restart when it empties again. This<br>
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seems to happen under linux, but the restart never occurs. When my<br>
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backend reads the second last 32k chunk from the scanner the entire<br>
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machine locks up and I have to shutdown the scanner to have it continue. <br>
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<p>
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I have to admit that this is my first foray into interfaceing with the<br>
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scsi subsystem, and have some hope that one of you scsi/scanner gurus<br>
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might have a clue to impart to me on possible reasons for this behavior.<br>
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<p>
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Thanks for your time,<br>
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Tyler Bindon<br>
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<a href="mailto:martica@martica.org">martica@martica.org</a><br>
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<p>
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<p>
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<p>
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Sample Scan Output for your perusal:<br>
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<p>
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% scanimage -x 200 -y 120 --resolution=300 > test.pnm<br>
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.<br>
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. many many many lines ommited<br>
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.<br>
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reader: waiting for data.[sanei_scsi] scsi_req_enter: entered 0x807ec10<br>
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[sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10<br>
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[sanei_scsi] sanei_scsi.issue: 0x807ec10<br>
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[sanei_scsi] sanei_scsi_req_wait: read 54 bytes<br>
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[relisys] avail = 181797<br>
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! 181797 bytes available.<br>
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reader: About to read 32000 bytes, [sanei_scsi] scsi_req_enter: entered<br>
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0x807ec1<br>
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[sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10<br>
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[sanei_scsi] sanei_scsi.issue: 0x807ec10<br>
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[sanei_scsi] sanei_scsi_req_wait: read 32036 bytes<br>
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Successful.<br>
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Outputting 32000 bytes to fd,<br>
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reader: waiting for data.[sanei_scsi] scsi_req_enter: entered 0x807ec10<br>
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[sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10<br>
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[sanei_scsi] sanei_scsi.issue: 0x807ec10<br>
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[sanei_scsi] sanei_scsi_req_wait: read 54 bytes<br>
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[relisys] avail = 151104<br>
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! 151104 bytes available.<br>
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reader: About to read 32000 bytes, [sanei_scsi] scsi_req_enter: entered<br>
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0x807ec1<br>
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[sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10<br>
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[sanei_scsi] sanei_scsi.issue: 0x807ec10<br>
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<p>
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<p>
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<p>
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<p>
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<pre>
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--
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Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a>
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0174.html">Larry Snyder: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<li> <b>Previous message:</b> <a href="0172.html">Hugo van der Kooij: "Re: updated RPM packages"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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