📄 2_cypress usb starter kit device driver complete with source code.htm
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<CENTER><FONT color=green size=5>A USB Driver for the Cypress USB Starter
Kit</FONT> </CENTER><BR>
<P>One of the most helpful aids when first starting out in something new
is examples. Cypress forgot this when they introduced their USB Starter
Kit. But then for $99 U.S., you can't expect the world. The USB
Thermometer Driver and Application was developed under contract by System
Solutions 72410.77@compuserve.com. The code is not freely available. </P>
<P>What I have done is modified the WDM ISO USB driver distributed with
the Windows Device Driver Kit for use with the Cypress Digital Themometer.
I've kept it basically the same, so you can actually run the Digital
Temperature Application on this driver to see that in-fact it does work! I
will cop some flap for this, as the driver isn't really a good example to
start with, especially if you know little about WDM Programming, as you
will learn some bad habits. I'll point these out. </P>
<P>As the driver is based on copyright material developed by Microsoft, I
will not distribute the entire driver. What I will attempt to do, is show
you the modifications necessary to change the driver so that it works with
the Cypress USB Starter Kit. This hopefully will also give you a better
understanding as we work through the example. </P>
<P>The driver is simply the ISO_USB driver featured in the Microsoft DDK
with modifications in IsoUsb_CreateDeviceObject so you can talk to the
Kernel Mode Device Driver using "\.\\Thermometer_0". This allows the
Cypress application to talk to the driver, rather than using the GUID
which Microsoft uses in their example. </P>
<P>The IOCTL handler has been totally modified to handle calls from the
thermometer application which comes with the Cypress Kit. This allows you
to run the Cypress Thermometer Application on this device driver. It
includes all the IOCTL Control Code 4 Functions such as Set LED
Brightness, Read Thermometer, Read Port, Write Port, Read RAM, Write RAM
& Read ROM as per the Cypress Starter Kit User Guide(Ver 0.993) Page
48. </P>
<P><B>Modifiying the IOCTL Call Handler.</B> </P>
<P>O.K., forget the modifications. We will start the handler for the
IRP_MJ_DEVICE_CONTROL from scratch. Delete or rename IOCTLISO.C. </P>
<P>Below is the table of functions we will have to implement. This is
simular to the table provided by Cypress for compatibility. </P>
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<TABLE cellSpacing=1 cellPadding=7 width=583 border=1>
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<TR>
<TD vAlign=top width="19%"><B><FONT face=Arial size=1>
<P align=center>Command</B></FONT></P></TD>
<TD vAlign=top width="40%" colSpan=4><B><FONT face=Arial size=1>
<P align=center>Command Value</B></FONT></P></TD>
<TD vAlign=top width="40%" colSpan=4><B><FONT face=Arial size=1>
<P align=center>Out Value</B></FONT></P></TD></TR>
<TR>
<TD vAlign=top width="19%"> </TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>MSB</FONT></P></TD>
<TD vAlign=top width="10%"> </TD>
<TD vAlign=top width="10%"> </TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>LSB</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>MSB</FONT></P></TD>
<TD vAlign=top width="10%"> </TD>
<TD vAlign=top width="10%"> </TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>LSB</FONT></P></TD></TR>
<TR>
<TD vAlign=top width="19%"><FONT face=Arial size=1>
<P>Set LED Brightness</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Brightness</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>0x0E</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Status</FONT></P></TD></TR>
<TR>
<TD vAlign=top width="19%"><FONT face=Arial size=1>
<P>Read Thermometer</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>0x0B</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Button</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Sign</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Temp</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Status</FONT></P></TD></TR>
<TR>
<TD vAlign=top width="19%"><FONT face=Arial size=1>
<P>Read Port</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Port</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>0x14</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Value</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Status</FONT></P></TD></TR>
<TR>
<TD vAlign=top width="19%"><FONT face=Arial size=1>
<P>Write Port</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Value</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>Port</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>0x15</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
<TD vAlign=top width="10%"><FONT face=Arial size=1>
<P align=center>-</FONT></P></TD>
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