📄 windowsce_net 420串口驱动分析(2)--jesse.htm
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<TD><FONT
size=4><STRONG>windowsCE.net 420串口驱动分析(2)</STRONG></FONT><BR>jesse
发表于 2005-10-9 13:15:39 </TD></TR>
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<H1 style="MARGIN-LEFT: 7pt"><SPAN
style="COLOR: #ffffff; FONT-FAMILY: 幼圆; mso-ascii-font-family: Arial">代码分析</SPAN></H1></TD></TR></TBODY></TABLE>
<H1><SPAN lang=EN-US><O:P> </O:P></SPAN></H1>
<P class=MsoBodyText><SPAN lang=EN-US><O:P> </O:P></SPAN>
</P>
<P class=MsoBodyText><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在开始具体代码之前我们先来看看，相关的一些结构。</SPAN>
<SPAN lang=EN-US>HWOBJ</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是相应的硬件设备操作的抽象集合。结构的定义后的注释与实际的用途有点点出入，</SPAN><SPAN
lang=EN-US>BandFlags</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">指定</SPAN><SPAN
lang=EN-US>IST</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的启动时间，可选为在初始化过程启动或是在打开设备的时候起动</SPAN><SPAN
lang=EN-US>ISR.</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">而第二个参数则是指定拦截的具体的系统中断号。最后一个参数是一个结构，该结构定义了硬件操作的各式行为函数的指针，</SPAN><SPAN
lang=EN-US>MDD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">正是通过这些函数来访问具体的</SPAN><SPAN
lang=EN-US>PDD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">操作。</SPAN>
<BR><SPAN lang=EN-US style="FONT-SIZE: 8pt">typedef struct
__HWOBJ {<O:P></O:P></SPAN> </P>
<P class=MsoBodyText
style="MARGIN: 0cm -17.85pt 0pt 41.95pt"><SPAN lang=EN-US
style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>ULONG<SPAN
style="mso-tab-count: 1">
</SPAN>BindFlags; // Flags controlling MDD behaviour.<SPAN
style="mso-spacerun: yes"> </SPAN>Se
above.<O:P></O:P></SPAN> </P>
<P class=MsoBodyText
style="MARGIN: 0cm -17.85pt 0pt 41.95pt"><SPAN lang=EN-US
style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>DWORD<SPAN
style="mso-spacerun: yes"> </SPAN><SPAN
style="mso-spacerun: yes"> </SPAN><SPAN
style="mso-spacerun: yes"> </SPAN>dwIntID;<SPAN
style="mso-spacerun: yes"> </SPAN>// Interrupt
Identifier used if THREAD_AT_INIT or
THREAD_AT_OPEN<O:P></O:P></SPAN> </P>
<P class=MsoBodyText
style="MARGIN: 0cm -17.85pt 0pt 41.95pt"><SPAN lang=EN-US
style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes">
</SPAN>PHW_VTBL<SPAN style="mso-tab-count: 1">
</SPAN>pFuncTbl;<O:P></O:P></SPAN> </P>
<P class=MsoBodyText
style="MARGIN: 0cm -17.85pt 0pt 41.95pt; TEXT-INDENT: 16.5pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt">} HWOBJ,
*PHWOBJ;<O:P></O:P></SPAN> <BR><BR><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">而</SPAN><SPAN
lang=EN-US>HW_VTBL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">则是代表具体硬件操作函数指针的集合，该结构所指向的函数包括了初始化、打开、关闭、接收、发送、设置</SPAN><SPAN
lang=EN-US>Baudrate</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等一系列操作。结构存在就像纽带一样联系着</SPAN><SPAN
lang=EN-US>PDD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中的具体实现和</SPAN><SPAN
lang=EN-US>MDD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中的抽象操作。</SPAN><SPAN
lang=EN-US>PDD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的实现必须遵循</SPAN><SPAN
lang=EN-US>HW_VTBL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中所描述的函数形式，并构造出相应的</SPAN><SPAN
lang=EN-US>HW_VTBL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实例。驱动的编写就是针对这些函数来一一进行实现。</SPAN>
</P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt">typedef
struct __HW_VTBL<SPAN
style="mso-spacerun: yes">
</SPAN>{<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>PVOID<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>(*HWInit)(ULONG Identifier, PVOID pMDDContext, PHWOBJ
pHWObj);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>BOOL<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>(*HWPostInit)(PVOID pHead);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>ULONG<SPAN
style="mso-tab-count: 1">
</SPAN>(*HWDeinit)(PVOID pHead);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>BOOL<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>(*HWOpen)(PVOID pHead);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>ULONG<SPAN
style="mso-tab-count: 1">
</SPAN>(*HWClose)(PVOID pHead);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes">
</SPAN>INTERRUPT_TYPE (*HWGetIntrType)(PVOID
pHead);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>ULONG<SPAN
style="mso-tab-count: 1">
</SPAN>(*HWRxIntrHandler)(PVOID pHead, PUCHAR pTarget, PULONG
pBytes);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>VOID<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>(*HWTxIntrHandler)(PVOID pHead, PUCHAR pSrc, PULONG
pBytes);<O:P></O:P></SPAN> </P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
style="mso-spacerun: yes"> </SPAN>VOID<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>(*HWModemIntrHandler)(PVOID pHead);<O:P></O:P></SPAN>
</P>
<P class=MsoBodyText style="MARGIN: 0cm -17.85pt 0pt 41.95pt"
align=left><SPAN lang=EN-US style="FONT-SIZE: 8pt"><SPAN
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