Initial version of modem and serial port

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1084
2003-07-06 13:07:16 +00:00 · 2003-07-06 13:07:16 +00:00 · 2b61bd2759
commit 2b61bd2759
parent c2f035784b
3 changed files with 1211 additions and 0 deletions
--- a/include/serialport.h
+++ b/include/serialport.h
@ -0,0 +1,135 @@
+/*
+ *  Copyright (C) 2002  The DOSBox Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#if !defined __SERIALPORT_H
+#define __SERIALPORT_H
+
+#include <dosbox.h>
+
+//If it's too high you overflow terminal clients buffers i think
+#define FIFO_SIZE  (1024)
+
+// Serial port interface //
+
+#define M_CTS 0x01
+#define M_DSR 0x02
+#define M_RI  0x04
+#define M_DCD 0x08
+
+enum INT_TYPES {
+	INT_MS,
+	INT_TX,
+	INT_RX,
+	INT_RX_FIFO,
+	INT_LS,
+	INT_NONE,
+};
+
+typedef void MControl_Handler(Bitu mc);
+
+class CSerial {
+public:
+
+	// Constructor takes base port (0x3f0, 0x2f0, 0x2e0, etc.), IRQ, and initial bps //
+	CSerial (Bit16u initbase, Bit8u initirq, Bit32u initbps);
+	virtual ~CSerial();
+
+	// External port functions for IOHandlers //
+	void write_port(Bit32u port, Bit8u val);
+	Bit8u read_port(Bit32u port);
+
+	static void write_serial(Bit32u port,Bit8u val);
+	static Bit8u read_serial(Bit32u port);
+
+	void SetMCHandler(MControl_Handler * mcontrol);
+	
+	/* Allow the modem to change the modem status bits */
+	void setmodemstatus(Bit8u status);
+	Bit8u getmodemstatus(void);
+	Bit8u getlinestatus(void);
+
+	void checkint(void);
+	void raiseint(INT_TYPES type);
+	void lowerint(INT_TYPES type);
+
+	/* Access to the receive fifo */
+	Bitu  rx_free();
+	void  rx_addb(Bit8u byte);
+	void  rx_adds(Bit8u * data,Bitu size);
+	Bitu  rx_size();
+	Bit8u rx_readb(void);
+
+	/* Access to the transmit fifo */
+	Bitu  tx_free();
+	void  tx_addb(Bit8u byte);
+	Bitu  tx_size();
+	Bit8u tx_readb(void);
+
+
+	//  These variables maintain the status of the serial port
+	Bit16u base;
+	Bit16u irq;
+	Bit32u bps;
+
+	bool FIFOenabled;
+	Bit16u FIFOsize;
+
+private:
+
+	void setdivisor(Bit8u dmsb, Bit8u dlsb);
+	void checkforirq(void);
+	struct {
+		Bitu used;
+		Bitu pos;
+		Bit8u data[FIFO_SIZE];
+	} rx_fifo,tx_fifo;
+	struct {
+		Bitu requested;
+		Bitu enabled;
+		INT_TYPES active;
+	} ints;
+
+	Bitu rx_lastread;
+	Bit8u irq_pending;
+	
+	Bit8u scratch;
+	Bit8u dlab;
+	Bit8u divisor_lsb;
+	Bit8u divisor_msb;
+	Bit8u wordlen;
+	Bit8u dtr;
+	Bit8u rts;
+	Bit8u out1;
+	Bit8u out2;
+	Bit8u local_loopback;
+	Bit8u linectrl;
+	Bit8u intid;
+	Bit8u ierval;
+	Bit8u mstatus;
+
+	Bit8u txval;
+	Bit8u timeout;
+
+	MControl_Handler * mc_handler;
+	char remotestr[4096];
+};
+
+// This function returns the CSerial objects for ports 1-4 //
+CSerial *getComport(Bitu portnum);
+
+#endif