PB编写看门狗流式驱动

(1)  建立驱动程序目录
在 C:\WINCE500\PLATFORM\mini2440\Src\Drivers\下建立 WDTDriver目录，并在dirs文件中加入此目录，使系统编译 bsp 的时候可以编译这个文件 

(2)为 WDT驱动创建 Makefile文件

可以参考其他驱动程序示例创建 Makefile文件。 在 WDTDriver目录中建立 makefile文件，内容如下：

#
# DO NOT EDIT THIS FILE!!!  Edit .\sources. if you want to add a new source
# file to this component.  This file merely indirects to the real make file
# that is shared by all the components of Peg
#
!INCLUDE $(_MAKEENVROOT)\makefile.def

(3)为 WDT驱动创建 source 文件

可以参考其他驱动程序实例创建source 文件，内容如下：

!if 0
    File:   sources
     Copyright (c) 1995-2002 Microsoft Corporation.  All rights reserved.
!endif

!if "$(BSP_NOWATCHDOG)" == "1"
SKIPBUILD=1
!endif

RELEASETYPE=PLATFORM
TARGETNAME=WDTDriver
TARGETTYPE=DYNLINK
DLLENTRY=DllEntry

TARGETLIBS= \
    $(_COMMONSDKROOT)\lib\$(_CPUINDPATH)\coredll.lib \

MSC_WARNING_LEVEL = $(MSC_WARNING_LEVEL) /W3 /WX
      
SOURCES= wdt.cpp     

(4)编写wdt.def导出 Dll 符号

 可以参考其他驱动程序示例创建 wdt.def文件。

;
; Windows WDT Driver. Written by yubaolee(.cpp/anglecloudy)
LIBRARY WDT
EXPORTS
	WDT_Close
	WDT_Deinit
	WDT_Init
	WDT_IOControl
	WDT_Open
	WDT_PowerDown
	WDT_PowerUp
	WDT_Read
	WDT_Seek
	WDT_Write

(5)把驱动加入内核 在配置文件 platform.bib中加入以下内容：

IF BSP_NOWATCHDOG !
	WDTDriver.dll             $(_FLATRELEASEDIR)\WDTDriver.dll				NK	SH
ENDIF BSP_NOWATCHDOG !

(6)把 LED 驱动加入注册表 在注册表文件 platform.reg中加入以下内容：

IF BSP_NOWATCHDOG !
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\WDTDriver]
   "Prefix"="WDT"
   "Dll"="WDTDriver.dll"
   "Order"="200"
ENDIF BSP_NOWATCHDOG !

(7)编写代码：

//wdt.h文件
#ifndef __WDT_H_
#define __WDT_H_

#ifdef __cplusplus
extern "C" {
#endif

DWORD WDT_Init(DWORD dwContext);
DWORD WDT_Open(DWORD hDeviceContext, DWORD AccessCode, DWORD ShareMode);
DWORD WDT_Write(DWORD hOpenContext, LPCVOID pSourceBytes, DWORD NumberOfBytes);

DWORD WDT_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count);
DWORD WDT_Seek(DWORD hOpenContext, long Amount, DWORD Type);

BOOL WDT_IOControl(DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn, DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut);
BOOL WDT_Close(DWORD hOpenContext);
BOOL WDT_Deinit(DWORD hDeviceContext);
void WDT_PowerUp(DWORD hDeviceContext);
void WDT_PowerDown(DWORD hDeviceContext);

#ifdef __cplusplus
}
#endif
#endif

//wdt.cpp源码
#include <windows.h>
#include <nkintr.h>
#include <pm.h>
#include "pmplatform.h"
#include "Pkfuncs.h"
#include "s2440.h"

#include "wdt.h"

volatile WATCHreg	*s2440WDT = 0;

static BOOL FeedIt()
{

	s2440WDT->rWTCON = 0x8021; // Init Value
	s2440WDT->rWTDAT = s2440WDT->rWTCNT = 0xFEA9;
	s2440WDT->rWTCON = ( 1 << 0) | (0x03 << 3 ) | (1 << 5) | (0x5A << 8);
	RETAILMSG(1,(TEXT("WDT: feed ok\r\n")));
	return TRUE;
}

BOOL WINAPI  
DllEntry(HANDLE	hinstDLL, 
			DWORD dwReason, 
			LPVOID  Reserved/* lpvReserved */)
{
	switch(dwReason)
	{
	case DLL_PROCESS_ATTACH:
		DEBUGREGISTER((HINSTANCE)hinstDLL);
		break;
	case DLL_THREAD_ATTACH:
		break;
	case DLL_THREAD_DETACH:
		break;
	case DLL_PROCESS_DETACH:
		break;
#ifdef UNDER_CE
	case DLL_PROCESS_EXITING:
		break;
	case DLL_SYSTEM_STARTED:
		break;
#endif
	}

	return TRUE;
}


BOOL WDT_Deinit(DWORD hDeviceContext)
{
	
	return TRUE;
}
 

BOOL WDT_IOControl(DWORD hOpenContext, 
				   DWORD dwCode, 
				   PBYTE pBufIn, 
				   DWORD dwLenIn, 
				   PBYTE pBufOut, 
				   DWORD dwLenOut, 
				   PDWORD pdwActualOut)
{
 
	return 0;
} 

void WDT_PowerDown(DWORD hDeviceContext)
{
} 

void WDT_PowerUp(DWORD hDeviceContext)
{
} 

DWORD WDT_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count)
{
	return 0;
} 

DWORD WDT_Seek(DWORD hOpenContext, long Amount, DWORD Type)
{
	return 0;
} 

DWORD WDT_Init(DWORD dwContext)
{

  do {
		s2440WDT = (volatile WATCHreg *) VirtualAlloc(0,sizeof(WATCHreg),MEM_RESERVE, PAGE_NOACCESS);
		if (s2440WDT == 0) {
			break;
		}

		if (!VirtualCopy((PVOID)s2440WDT,(PVOID)(WATCH_BASE),sizeof(WATCHreg),PAGE_READWRITE | PAGE_NOCACHE )) {
			break;
		}

		//ret = TRUE;
		RETAILMSG(1,(TEXT("WDT: VirtualAlloc ok\r\n")));
	} while (0);
	RETAILMSG(1,(TEXT("WDT: Init\r\n")));
	return TRUE;
}

BOOL WDT_Close(DWORD hOpenContext)
{
	if (s2440WDT) {
		VirtualFree((void*)s2440WDT, sizeof(WATCHreg), MEM_RELEASE);
		s2440WDT = 0;
		RETAILMSG(1,(TEXT("WDT: VirtualFree ok\r\n")));
	}
	RETAILMSG(1,(TEXT("WDT: Close\r\n")));
	return TRUE;
} 

// Beaf is here

DWORD WDT_Open(DWORD hDeviceContext, DWORD AccessCode, DWORD ShareMode)
{
	RETAILMSG(1,(TEXT("WDT: Open\r\n")));
	return TRUE;
} 

DWORD WDT_Write(DWORD hOpenContext, LPCVOID pSourceBytes, DWORD NumberOfBytes)
{
	RETAILMSG(1,(TEXT("WDT: Write\r\n")));
	FeedIt();
	return TRUE;
}

(8)这时打开PB 在FileView视图mini2440/src/Drivers/就可以看到WDT的工程了，右键Build Current Project,没有错误的话，就可以生成WDT.DLL文件了，再生成一下系统就行了。

-----------------------------------.CPP---------------------------------------------------------------

@written by .cpp

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