www.pudn.com > Windows 2000设备驱动程序设计指南 .zip > Driver.h

// Driver.h - Chapter 11 
// 
// Copyright (C) 2000 by Jerry Lozano 
// 
 
#pragma once 
 
extern "C" { 
#include  
} 
#include "Unicode.h" 
 
enum DRIVER_STATE {Stopped, Started, Removed}; 
 
typedef struct _DEVICE_EXTENSION { 
	PDEVICE_OBJECT pDevice; 
	PDEVICE_OBJECT pLowerDevice; 
	ULONG DeviceNumber; 
	CUString ustrDeviceName;	// internal name 
	CUString ustrSymLinkName;	// external name 
	PUCHAR deviceBuffer;		// temporary pool buffer 
	ULONG deviceBufferSize; 
	ULONG xferCount;			// current transfer count 
	ULONG maxXferCount;			// requested xfer count 
	PUCHAR portBase;				// I/O register address 
	ULONG  portLength; 
	DRIVER_STATE state;		// current state of driver 
 
	KDPC pollingDPC;	// reserve custom DPC object 
	KTIMER pollingTimer;// and the timer object 
	LARGE_INTEGER pollingInterval;	// timeout counter in uS 
 
} DEVICE_EXTENSION, *PDEVICE_EXTENSION; 
 
// Define the interval between polls of device in uS 
#define POLLING_INTERVAL 100 
 
#define DATA_REG	0 
#define STATUS_REG	1 
#define CONTROL_REG	2 
 
// 
// Status register bits: 
// 
#define STS_NOT_IRQ	0x04	// 0 Int requested 
#define STS_NOT_ERR	0x08	// 0 Error 
#define STS_SELCTD	0x10	// 1 Selected 
#define STS_PE	0x20		// 1 Paper empty 
#define STS_NOT_ACK	0x40	// 0 Acknowledge 
#define STS_NOT_BSY	0x80	// 0 Printer busy 
 
// 
// Control register bits: 
// 
#define CTL_STROBE	0x01	// 1 Strobe data 
#define CTL_AUTOLF	0x02	// 1 Auto line feed 
#define CTL_NOT_RST	0x04	// 0 Reset printer 
#define CTL_SELECT	0x08	// 1 Select printer 
#define CTL_INTENB	0x10	// 1 Interrupt enable 
#define	CTL_DEFAULT	0xC0	// (Sets unused bits) 
 
// 
// Define access macros for registers. Each macro takes 
// a pointer to a Device Extension as an argument 
// 
#define ReadStatus( pDevExt )				\ 
(READ_PORT_UCHAR( 							\ 
  pDevExt->portBase + STATUS_REG )) 
 
#define ReadControl( pDevExt )			\ 
(READ_PORT_UCHAR( 							\ 
  pDevExt->PortBase + CONTROL_REG )) 
 
#define WriteControl( pDevExt, bData )	\ 
(WRITE_PORT_UCHAR( 							\ 
  pDevExt->portBase + CONTROL_REG, bData )) 
 
#define WriteData( pDevExt, bData )		\ 
(WRITE_PORT_UCHAR( 						\ 
  pDevExt->portBase + DATA_REG, bData ))