实例——usb设备驱动设计（上）--山野村夫.htm

USB驱动设计的步骤和主要程序框架

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                              style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">系统基本结构</SPAN></B><B 
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                              style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                              </SPAN>1</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN 
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                              12</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组成</SPAN></SPAN></P>
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                              style="FONT-SIZE: 12pt"><SPAN lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">PDIUSBD 
                              12</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">功能强大，成本较低，应用比较广泛，</SPAN><SPAN 
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">位并行口可以与处理器直接连接，硬件上实现</SPAN><SPAN 
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的底层协议能够满足系统的要求。</SPAN></SPAN></P>
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如图</SPAN><SPAN 
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示，</SPAN><SPAN 
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                              12</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是一个</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">28</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">脚的芯片，它的封装形式有两种：</SPAN><SPAN 
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                              style="FONT-FAMILY: Times New Roman">TSSOP28(</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">塑料极小封装</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">)28</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">脚，本体宽度</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'">．</SPAN><st1:chmetcnv 
                              UnitName="mm" SourceValue="4" HasSpace="False" 
                              Negative="False" NumberType="1" TCSC="0" 
                              w:st="on"><SPAN lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">4mm</SPAN></st1:chmetcnv><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。另一种封装是</SPAN><SPAN 
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                              style="FONT-FAMILY: Times New Roman">S028(</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">塑料小型封装</SPAN><SPAN 
                              lang=EN-US 
                              style="FONT-FAMILY: Times New Roman">)28</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，本体宽度</SPAN><SPAN 
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                              style="FONT-FAMILY: Times New Roman">7</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><st1:chmetcnv 
                              UnitName="mm" SourceValue="5" HasSpace="False" 
                              Negative="False" NumberType="1" TCSC="0" 
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                              style="FONT-FAMILY: Times New Roman">5mm</SPAN></st1:chmetcnv><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，其管脚具体说明如表</SPAN><SPAN 
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN></SPAN></DIV>
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                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其中：</SPAN></P>
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                              <P class=MsoNormal 
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                              lang=EN-US>O2</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为</SPAN><SPAN 
                              lang=EN-US>2mA</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">驱动输出；</SPAN></P>
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                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN 
                              lang=EN-US>OD4</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为</SPAN><SPAN 
                              lang=EN-US>4mA</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">驱动开漏输出；</SPAN></P>
                              <P class=MsoNormal 
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                              lang=EN-US><o:p>&nbsp;</o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN 
                              lang=EN-US>OD8</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为</SPAN><SPAN 
                              lang=EN-US>8mA</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">驱动开漏输出；</SPAN></P>
                              <P class=MsoNormal 
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                              lang=EN-US><o:p>&nbsp;</o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN 
                              lang=EN-US>1O2</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为</SPAN><SPAN 
                              lang=EN-US>4mA</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">输出。</SPAN></P>
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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'">．功能结构</SPAN></P>
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                              lang=EN-US><o:p>&nbsp;</o:p></SPAN></P>
                              <P class=MsoNormal 
                              style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN 
                              lang=EN-US>PDIUSBDl2</SPAN><SPAN 
                              style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">芯片的结构主要包括以下几部分</SPAN></P>
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                              <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'">·电压调整器：片内集成了一个</SPAN><SPAN