realclk.h

武安河书第一版（vxd）Windows 驱动例子

// realclk.h - real time clock interrupt class definition

class RTCInterrupt : public VHardwareInt
{
public:
	RTCInterrupt(VOID (*pCallback)());
	~RTCInterrupt();

	virtual VOID OnHardwareInt(VMHANDLE);
	VOID Enable(BOOL b=TRUE);

	static BYTE ReadRegister(BYTE reg);
	static VOID WriteRegister(BYTE reg, BYTE value);

protected:
	VOID (*m_callback)();
	BYTE m_originalB;
};

#define RTC_IRQ 8

// Required CMOS port definitions 

#define STATREG_B	0xB
#define STATREG_C	0xC

// Status Register B flags

#define ENABLE_INTERRUPT 0x40