mirror of
https://github.com/AppleWin/AppleWin.git
synced 2024-11-19 19:33:03 +00:00
302 lines
8.8 KiB
C++
302 lines
8.8 KiB
C++
/*
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AppleWin : An Apple //e emulator for Windows
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Copyright (C) 1994-1996, Michael O'Brien
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Copyright (C) 1999-2001, Oliver Schmidt
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Copyright (C) 2002-2005, Tom Charlesworth
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Copyright (C) 2006, Tom Charlesworth, Michael Pohoreski
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AppleWin is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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AppleWin is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with AppleWin; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Description: Enhanced //e & //c serial port emulation
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*
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* Author: Various
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*/
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#include "StdAfx.h"
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#pragma hdrstop
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static DWORD baudrate = CBR_19200;
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static BYTE bytesize = 8;
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static BYTE commandbyte = 0x00;
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static HANDLE commhandle = INVALID_HANDLE_VALUE;
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static DWORD comminactivity = 0;
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static BYTE controlbyte = 0x1F;
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static BYTE parity = NOPARITY;
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static BYTE recvbuffer[9];
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static DWORD recvbytes = 0;
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DWORD serialport = 0;
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static BYTE stopbits = ONESTOPBIT;
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static void UpdateCommState ();
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//===========================================================================
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static BOOL CheckComm () {
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comminactivity = 0;
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if ((commhandle == INVALID_HANDLE_VALUE) && serialport) {
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TCHAR portname[8];
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wsprintf(portname,
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TEXT("COM%u"),
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serialport);
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commhandle = CreateFile(portname,
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GENERIC_READ | GENERIC_WRITE,
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0,
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(LPSECURITY_ATTRIBUTES)NULL,
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OPEN_EXISTING,
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0,
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NULL);
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if (commhandle != INVALID_HANDLE_VALUE) {
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UpdateCommState();
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COMMTIMEOUTS ct;
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ZeroMemory(&ct,sizeof(COMMTIMEOUTS));
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ct.ReadIntervalTimeout = MAXDWORD;
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SetCommTimeouts(commhandle,&ct);
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}
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}
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return (commhandle != INVALID_HANDLE_VALUE);
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}
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//===========================================================================
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static void CheckReceive () {
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if (recvbytes || (commhandle == INVALID_HANDLE_VALUE))
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return;
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ReadFile(commhandle,recvbuffer,8,&recvbytes,NULL);
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}
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//===========================================================================
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static void CloseComm () {
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if (commhandle != INVALID_HANDLE_VALUE)
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CloseHandle(commhandle);
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commhandle = INVALID_HANDLE_VALUE;
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comminactivity = 0;
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}
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//===========================================================================
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static void UpdateCommState () {
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if (commhandle == INVALID_HANDLE_VALUE)
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return;
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DCB dcb;
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ZeroMemory(&dcb,sizeof(DCB));
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dcb.DCBlength = sizeof(DCB);
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GetCommState(commhandle,&dcb);
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dcb.BaudRate = baudrate;
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dcb.ByteSize = bytesize;
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dcb.Parity = parity;
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dcb.StopBits = stopbits;
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SetCommState(commhandle,&dcb);
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}
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//===========================================================================
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BYTE __stdcall CommCommand (WORD, BYTE, BYTE write, BYTE value, ULONG) {
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if (!CheckComm())
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return 0;
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if (write && (value != commandbyte)) {
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commandbyte = value;
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// UPDATE THE PARITY
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if (commandbyte & 0x20)
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switch (commandbyte & 0xC0) {
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case 0x00 : parity = ODDPARITY; break;
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case 0x40 : parity = EVENPARITY; break;
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case 0x80 : parity = MARKPARITY; break;
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case 0xC0 : parity = SPACEPARITY; break;
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}
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else
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parity = NOPARITY;
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UpdateCommState();
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}
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return commandbyte;
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}
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//===========================================================================
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BYTE __stdcall CommControl (WORD, BYTE, BYTE write, BYTE value, ULONG) {
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if (!CheckComm())
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return 0;
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if (write && (value != controlbyte)) {
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controlbyte = value;
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// UPDATE THE BAUD RATE
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switch (controlbyte & 0x0F) {
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case 0x00: // fall through
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case 0x01: // fall through
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case 0x02: // fall through
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case 0x03: // fall through
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case 0x04: // fall through
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case 0x05: baudrate = CBR_110; break;
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case 0x06: baudrate = CBR_300; break;
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case 0x07: baudrate = CBR_600; break;
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case 0x08: baudrate = CBR_1200; break;
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case 0x09: // fall through
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case 0x0A: baudrate = CBR_2400; break;
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case 0x0B: // fall through
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case 0x0C: baudrate = CBR_4800; break;
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case 0x0D: // fall through
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case 0x0E: baudrate = CBR_9600; break;
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case 0x0F: baudrate = CBR_19200; break;
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}
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// UPDATE THE BYTE SIZE
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switch (controlbyte & 0x60) {
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case 0x00: bytesize = 8; break;
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case 0x20: bytesize = 7; break;
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case 0x40: bytesize = 6; break;
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case 0x60: bytesize = 5; break;
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}
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// UPDATE THE NUMBER OF STOP BITS
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if (controlbyte & 0x80) {
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if ((bytesize == 8) && (parity == NOPARITY))
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stopbits = ONESTOPBIT;
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else if ((bytesize == 5) && (parity == NOPARITY))
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stopbits = ONE5STOPBITS;
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else
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stopbits = TWOSTOPBITS;
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}
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else
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stopbits = ONESTOPBIT;
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UpdateCommState();
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}
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return controlbyte;
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}
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//===========================================================================
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void CommDestroy () {
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if ((baudrate != CBR_19200) ||
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(bytesize != 8) ||
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(parity != NOPARITY) ||
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(stopbits != ONESTOPBIT)) {
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CommReset();
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CheckComm();
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}
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CloseComm();
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}
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//===========================================================================
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BYTE __stdcall CommDipSw (WORD, BYTE, BYTE, BYTE, ULONG) {
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// note: determine what values a real SSC returns
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return 0;
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}
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//===========================================================================
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void CommSetSerialPort (HWND window, DWORD newserialport) {
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if (commhandle == INVALID_HANDLE_VALUE)
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serialport = newserialport;
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else
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MessageBox(window,
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TEXT("You cannot change the serial port while it is ")
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TEXT("in use."),
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TEXT("Configuration"),
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MB_ICONEXCLAMATION | MB_SETFOREGROUND);
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}
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//===========================================================================
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void CommUpdate (DWORD totalcycles) {
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if (commhandle == INVALID_HANDLE_VALUE)
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return;
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if ((comminactivity += totalcycles) > 1000000) {
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static DWORD lastcheck = 0;
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if ((comminactivity > 2000000) || (comminactivity-lastcheck > 99950)) {
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DWORD modemstatus = 0;
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GetCommModemStatus(commhandle,&modemstatus);
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if ((modemstatus & MS_RLSD_ON) || DiskIsSpinning())
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comminactivity = 0;
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}
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if (comminactivity > 2000000)
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CloseComm();
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}
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}
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//===========================================================================
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BYTE __stdcall CommReceive (WORD, BYTE, BYTE, BYTE, ULONG) {
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if (!CheckComm())
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return 0;
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if (!recvbytes)
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CheckReceive();
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BYTE result = 0;
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if (recvbytes) {
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result = recvbuffer[0];
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if (--recvbytes)
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MoveMemory(recvbuffer,recvbuffer+1,recvbytes);
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}
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return result;
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}
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//===========================================================================
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void CommReset () {
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CloseComm();
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baudrate = CBR_19200;
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bytesize = 8;
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commandbyte = 0x00;
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controlbyte = 0x1F;
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parity = NOPARITY;
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recvbytes = 0;
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stopbits = ONESTOPBIT;
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}
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//===========================================================================
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BYTE __stdcall CommStatus (WORD, BYTE, BYTE, BYTE, ULONG) {
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if (!CheckComm())
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return 0x70;
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if (!recvbytes)
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CheckReceive();
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DWORD modemstatus = 0;
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GetCommModemStatus(commhandle,&modemstatus);
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return 0x10 | (recvbytes ? 0x08 : 0x00)
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| ((modemstatus & MS_RLSD_ON) ? 0x00 : 0x20)
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| ((modemstatus & MS_DSR_ON) ? 0x00 : 0x40);
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}
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//===========================================================================
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BYTE __stdcall CommTransmit (WORD, BYTE, BYTE, BYTE value, ULONG) {
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if (!CheckComm())
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return 0;
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DWORD byteswritten;
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WriteFile(commhandle,&value,1,&byteswritten,NULL);
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return 0;
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}
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//===========================================================================
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DWORD CommGetSnapshot(SS_IO_Comms* pSS)
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{
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pSS->baudrate = baudrate;
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pSS->bytesize = bytesize;
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pSS->commandbyte = commandbyte;
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pSS->comminactivity = comminactivity;
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pSS->controlbyte = controlbyte;
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pSS->parity = parity;
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memcpy(pSS->recvbuffer, recvbuffer, 9);
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pSS->recvbytes = recvbytes;
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pSS->stopbits = stopbits;
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return 0;
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}
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DWORD CommSetSnapshot(SS_IO_Comms* pSS)
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{
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baudrate = pSS->baudrate;
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bytesize = pSS->bytesize;
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commandbyte = pSS->commandbyte;
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comminactivity = pSS->comminactivity;
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controlbyte = pSS->controlbyte;
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parity = pSS->parity;
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memcpy(recvbuffer, pSS->recvbuffer, 9);
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recvbytes = pSS->recvbytes;
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stopbits = pSS->stopbits;
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return 0;
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}
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