📄 实例——usb设备驱动设计（上）--山野村夫.htm
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<TD class=content9 vAlign=center
bgColor=#bbccde><STRONG>实例——USB设备驱动设计（上）</STRONG></TD></TR>
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<DIV align=right><SPAN class=textbox-label>[
2007-10-9 10:47:00 | By: <SPAN
class=style3>山野村夫</SPAN>
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<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN
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'">芯片是飞利浦公司一款性能价格比很高的</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'">器件，通常用于基于微控制器的系统并与微控制器通过高速通用并行接口进行通信，也支持本地</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: Times New Roman">DMA</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输。该器件采用模块化的方法实现一个</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'">接口，允许在众多可用的微控制器中选择最合适的作为系统微控制器，允许使用现存的体系结构并使固件投资减到最小。这种灵活性减少了开发时间、风险和成本，是开发低成本且高效的</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'">外围设备解决方案的一种有效途径。由于</SPAN><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'">符合</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: Times New Roman">USB
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">1</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">规范，能适应大多数设备类规范的设计，如成像类、大容量存储类、通信类、打印类和人工输入设备等，因此</SPAN><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'">非常适合做很多外围设备，如打印机、扫描仪、外部大容量存储器</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: Times New Roman">(Zip</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">驱动器</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: Times New Roman">)</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和数码相机等。现在用</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: Times New Roman">SCSI</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实现的很多设备如果用</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'">来实现可以直接降低成本。</SPAN></SPAN></P>
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