实例——usb设备驱动设计（下）--山野村夫.htm

USB驱动设计的步骤和主要程序框架

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                            <TD class=content9 vAlign=center 
                              bgColor=#bbccde><STRONG>实例——USB设备驱动设计（下）</STRONG></TD></TR>
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                              <DIV align=right><SPAN class=textbox-label>[ 
                              2007-10-9 10:56:00 | By: <SPAN 
                              class=style3>山野村夫</SPAN> 
                          ]</SPAN></DIV></TD></TR></TBODY></TABLE>
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                            <TD><SPAN class=oblog_text>
                              <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B 
                              style="mso-bidi-font-weight: normal"><SPAN 
                              lang=EN-US 
                              style="FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">3</SPAN></B><B 
                              style="mso-bidi-font-weight: normal"><SPAN 
                              style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">系统模块源代码实现</SPAN></B><B 
                              style="mso-bidi-font-weight: normal"><SPAN 
                              lang=EN-US 
                              style="FONT-SIZE: 14pt"><o:p></o:p></SPAN></B></P>
                              <P class=MsoNormal 
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                              lang=EN-US><o:p><SPAN 
                              style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">&nbsp;</SPAN></o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN 
                              style="FONT-SIZE: 12pt"><SPAN lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">1</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">Host</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端控制程序设计</SPAN></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN 
                              lang=EN-US><o:p><SPAN 
                              style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">&nbsp;</SPAN></o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt"><SPAN 
                              style="FONT-SIZE: 12pt"><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">新一代通用串行接口</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">USB</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的优良特性提供了一个的解决方案。</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">CUSB</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的封装性和继承性如图</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">7-12</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。将</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">USB</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数封装成一个</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">CUSB</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">类在使用的时候提供了很大的方便，它主要包括</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">2</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个成员变量和</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">4</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个成员函数，通过继承父类得到</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">2</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个派生类，这</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">2</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个派生类公有地继承了</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">CUSB</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">类，通过对</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">4</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个成员函数使用完成对</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">USB</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的读写操作，类的封装性方便了程序的结构和安全性，而继承性则大大地提高软件的开发效率。同时，封装性和继承性的结合大大提高了系统的可靠性和软件的重用性。</SPAN></SPAN></P>
                              <P class=MsoNormal 
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                              <DIV class=MsoNormal 
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以下为</SPAN><SPAN 
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                              style="FONT-FAMILY: Times New Roman">USB</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与嵌入式主机进行数据通信的关键程序：</SPAN></SPAN></DIV>
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                              <P class=MsoNormal 
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                              lang=EN-US>2</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN 
                              lang=EN-US>USB Device</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">驱动程序设计</SPAN></P>
                              <P class=MsoNormal 
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                              lang=EN-US><o:p>&nbsp;</o:p></SPAN></P>
                              <P class=MsoNormal 
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">目前驱动程序开发的工具主要有</SPAN><SPAN 
                              lang=EN-US>Windiver</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、微软的</SPAN><SPAN 
                              lang=EN-US>DDK</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN 
                              lang=EN-US>Compuware</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">公司的</SPAN><SPAN 
                              lang=EN-US>DriverStudio</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等。</SPAN></P>
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                              lang=EN-US><o:p>&nbsp;</o:p></SPAN></P>