86 lines
4.2 KiB
HTML
86 lines
4.2 KiB
HTML
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-
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1252">
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<META NAME="Generator" CONTENT="Microsoft FrontPage 5.0">
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<TITLE>Bulk Usb</TITLE>
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</HEAD>
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<BODY LINK="#0000ff">
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<p><b><font face="Times New Roman">The Bulkusb driver</font></b></p>
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<ul>
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<li><font face="Times New Roman">The bulkusb driver is a generic function driver, based on the
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Windows Driver Model (WDM).</font></li>
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<li><font face="Times New Roman">Supports Plug and Play(PnP), Power
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Management(PM), Windows Management Instrumentation (WMI) and the Selective
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Suspend (SS) features.</font></li>
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<li><font face="Times New Roman">This sample is based off the selSusp DDK
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sample. Please refer the selSusp sample and the DDK docs to understand the
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handling of PnP, PM, WMI and SS features and implementations.</font></li>
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<li>
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<p><font face="Times New Roman">The USB device used for this sample is a generic
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Intel I82930 USB evaluation board programmed with a simple loopback test using a
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64 KB circular buffer. None of the code in the sample is specific to this
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controller chip. </font></p>
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</li>
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</ul>
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<p><font face="Times New Roman">The bulkusb.sys is a minidriver that transfers
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asynchronous bulk data packets to and from this board. The USB Request Block (URBs)
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allow an abstracted chip-independent transfer to and from the core USB stack. The
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sample also consists of a console application</font></p>
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<p><font face="Times New Roman">The section below describes the driver routines
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that allow a user-mode application to perform bulk reads and writes.</font></p>
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<p><b>Bulkusb Reads/Writes</b></p>
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<table border="1" width="68%">
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<tr>
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<td width="50%"><font face="Courier New">Requests</font></td>
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<td width="50%"><font face="Courier New">Dispatch Routines</font></td>
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</tr>
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<tr>
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<td width="50%"><font face="Courier New">IRP_MJ_CREATE</font></td>
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<td width="50%"><font face="Courier New">BulkUsb_DispatchCreate()</font></td>
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</tr>
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<tr>
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<td width="50%"><font face="Courier New">IRP_MJ_CLOSE</font></td>
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<td width="50%"><font face="Courier New">BulkUsb_DispatchClose()</font></td>
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</tr>
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<tr>
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<td width="50%"><font face="Courier New">IRP_MJ_READ</font></td>
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<td width="50%"><font face="Courier New">BulkUsb_DispatchReadWrite()</font></td>
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</tr>
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<tr>
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<td width="50%"><font face="Courier New">IRP_MJ_WRITE</font></td>
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<td width="50%"><font face="Courier New">BulkUsb_DispatchReadWrite()</font></td>
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</tr>
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</table>
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<p>Notes</p>
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<ul>
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<li>The <font face="Courier New">BulkUsb_DispatchCreate</font> allows
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user-mode app to open handles to the device or to a specific pipe.</li>
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<li>The pipe # 3 and pipe # 4 correspond to the bulk IN and bulk OUT pipes on
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the I82930 board respectively.
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The driver does not hard-code the pipe # for reads and writes.</li>
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<li>The <font face="Courier New">BulkUsb_DispatchClose</font> closes open handle to a specific pipe and the
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device.</li>
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</ul>
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<p><font face="Times New Roman">The </font><font face="Courier New">BulkUsb_DispatchReadWrite</font><font face="Times New Roman">,
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transforms the </font>original read/write request into an internal device
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control request, creates and initializes an URB for this request and sets a completion routine for this
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request (<font face="Courier New">BulkUsb_ReadWriteCompletion)</font><font face="Times New Roman">.
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</font>The amount of data transferred is
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limited by the BULKUSB_MAX_TRANSFER_SIZE (64KB circular buffer limitation). For additional data
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transfers, the request (Irp/Urb
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pair) is re-initialized and re-submitted in the completion routine.</p>
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<p>Since the driver does not save the read-write context information anywhere in the
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driver, but passes it along to the completion routine, it is multi-threaded safe.</p>
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<p>Please refer the detailed inline comments in the bulkusb driver for
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implementation details.</p>
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<p>The rwbulk.exe console application is used to initiate bulk transfers and
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obtain a dump of information on the device's I/O endpoints. The application also
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demonstrates how to use GUID-based device names and pipe names generated by the
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operating system using the SetupDiXXX user-mode APIs.</p>
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<p> </p>
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<p> </p>
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<p> </p>
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</BODY>
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</HTML>
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