commport.h

运行环境:DOS, 通过串口升级的下位程序, 需配合上位升级程序FileUpgrade运行, 可用于嵌入式DOS系统中.

// CommPort.h: interface for the CCommPort class.
//
//////////////////////////////////////////////////////////////////////
#ifndef _CLASS_CCommPort_h_ 
#define _CLASS_CCommPort_h_
#include <dos.H>
class CCommPort
{
public:
	CCommPort();
	~CCommPort();
	int		sio_open(unsigned short int mPortBasicAddr,short int mInterruptIRQNo,long int mBaudRate,unsigned short int BufferSize);
	void	sio_write(char const *buf, int len);
	void    sio_write(char const *str);
	void	sio_putch(char const ch);
	void    sio_fflush();
	unsigned char sio_havechar();
	signed short sio_getch();
//	void SetSpeed(unsigned long newRate){};
	unsigned char GetModemStatus();
	void sio_close();
protected:
	unsigned char *mData;
	void interrupt	(*m_PortOldIntHandle)(...);//旧的中断函数
	unsigned char m_PortIndex;//255无效。
	unsigned short int	m_PortAddr;				//端口基地址
	unsigned short int  m_InterruptNo;			//端口中断向量号
	unsigned short int	mHead,mTail;
	unsigned short int	mBufferSize;
protected:
	virtual void ReceiveNewChar(unsigned char newChar);
	virtual void ModemStatusChange(short int ModemSignal);
private:
	void	COM_ISR();
	static void interrupt COM_ISR_0(...);
	static void interrupt COM_ISR_1(...);
	static void interrupt COM_ISR_2(...);
	static void interrupt COM_ISR_3(...);
	static void interrupt COM_ISR_4(...);
	static void interrupt COM_ISR_5(...);

};
inline void CCommPort::ReceiveNewChar(unsigned char newChar)
{
	if(!mData) return;
	mData[mTail++]=newChar;
	if(mTail==mBufferSize) mTail=0;
	if(mHead==mTail)
	{ 	mHead++;
		if(mHead==mBufferSize) mHead=0;
	}
}
inline unsigned char CCommPort::sio_havechar()
{
	return (mHead!=mTail);
}
inline unsigned char CCommPort::GetModemStatus()
{
	return inportb(m_PortAddr+6);
}
inline void CCommPort::sio_fflush()
{
	mHead=mTail=0;
}
inline void CCommPort::ModemStatusChange(short int ModemSignal)
{
};
#endif