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AppleWin/source/SerialComms.cpp

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/*
AppleWin : An Apple //e emulator for Windows
Copyright (C) 1994-1996, Michael O'Brien
Copyright (C) 1999-2001, Oliver Schmidt
Copyright (C) 2002-2005, Tom Charlesworth
Copyright (C) 2006-2009, Tom Charlesworth, Michael Pohoreski, Nick Westgate
AppleWin 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.
AppleWin 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with AppleWin; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Description: Super Serial Card emulation
*
* Author: Various
*/
// TO DO:
// . Enable & test Tx IRQ
// . DIP switch read values
//
// Refs:
// (1) "Super Serial Card (SSC) Memory Locations for Programmers" - Aaron Heiss
// (2) SSC recv IRQ example: http://www.wright.edu/~john.matthews/ssc.html#lst - John B. Matthews, 5/13/87
// (3) WaitCommEvent, etc: http://mail.python.org/pipermail/python-list/2002-November/131437.html
// (4) SY6551 info: http://www.axess.com/twilight/sock/rs232pak.html
//
#include "StdAfx.h"
#include "AppleWin.h"
#include "CPU.h"
#include "Disk.h" // DiskIsSpinning()
#include "Frame.h"
#include "Memory.h"
#include "SerialComms.h"
#include "..\resource\resource.h"
//#define SUPPORT_MODEM
#define TCP_SERIAL_PORT 1977
// Default: 19200-8-N-1
// Maybe a better default is: 9600-7-N-1 (for HyperTrm)
SSC_DIPSW CSuperSerialCard::m_DIPSWDefault =
{
// DIPSW1:
CBR_19200,
FWMODE_CIC,
// DIPSW2:
ONESTOPBIT,
8, // ByteSize
NOPARITY,
true, // LF
false, // INT
};
//===========================================================================
CSuperSerialCard::CSuperSerialCard() :
m_aySerialPortChoices(NULL),
m_uTCPChoiceItemIdx(0)
{
memset(m_ayCurrentSerialPortName, 0, sizeof(m_ayCurrentSerialPortName));
m_dwSerialPortItem = 0;
m_hCommHandle = INVALID_HANDLE_VALUE;
m_hCommListenSocket = INVALID_SOCKET;
m_hCommAcceptSocket = INVALID_SOCKET;
m_dwCommInactivity = 0;
m_hCommThread = NULL;
for (UINT i=0; i<COMMEVT_MAX; i++)
m_hCommEvent[i] = NULL;
memset(&m_o, 0, sizeof(m_o));
InternalReset();
}
void CSuperSerialCard::InternalReset()
{
GetDIPSW();
m_bTxIrqEnabled = false;
m_bRxIrqEnabled = false;
m_bWrittenTx = false;
m_vuRxCurrBuffer = 0;
m_vbTxIrqPending = false;
m_vbRxIrqPending = false;
m_qComSerialBuffer[0].clear();
m_qComSerialBuffer[1].clear();
m_qTcpSerialBuffer.clear();
}
CSuperSerialCard::~CSuperSerialCard()
{
delete [] m_aySerialPortChoices;
}
//===========================================================================
// TODO: Serial Comms - UI Property Sheet Page:
// . Ability to config the 2x DIPSWs - only takes affect after next Apple2 reset
// . 'Default' button that resets DIPSWs to DIPSWDefaults
// . Need to respect IRQ disable dipswitch (cannot be overridden by software)
void CSuperSerialCard::GetDIPSW()
{
// TODO: Read settings from Registry
// In the meantime, use the defaults:
SetDIPSWDefaults();
//
m_uBaudRate = m_DIPSWCurrent.uBaudRate;
m_uStopBits = m_DIPSWCurrent.uStopBits;
m_uByteSize = m_DIPSWCurrent.uByteSize;
m_uParity = m_DIPSWCurrent.uParity;
//
m_uControlByte = GenerateControl();
m_uCommandByte = 0x00;
}
void CSuperSerialCard::SetDIPSWDefaults()
{
// Default DIPSW settings (comms mode)
// DIPSW1:
m_DIPSWCurrent.uBaudRate = m_DIPSWDefault.uBaudRate;
m_DIPSWCurrent.eFirmwareMode = m_DIPSWDefault.eFirmwareMode;
// DIPSW2:
m_DIPSWCurrent.uStopBits = m_DIPSWDefault.uStopBits;
m_DIPSWCurrent.uByteSize = m_DIPSWDefault.uByteSize;
m_DIPSWCurrent.uParity = m_DIPSWDefault.uParity;
m_DIPSWCurrent.bLinefeed = m_DIPSWDefault.bLinefeed;
m_DIPSWCurrent.bInterrupts = m_DIPSWDefault.bInterrupts;
}
BYTE CSuperSerialCard::GenerateControl()
{
const UINT CLK=1; // Internal
UINT bmByteSize = (8 - m_uByteSize); // [8,7,6,5] -> [0,1,2,3]
_ASSERT(bmByteSize <= 3);
UINT StopBit;
if ( ((m_uByteSize == 8) && (m_uParity != NOPARITY)) ||
( m_uStopBits != ONESTOPBIT ) )
StopBit = 1;
else
StopBit = 0;
return (StopBit<<7) | (bmByteSize<<5) | (CLK<<4) | BaudRateToIndex(m_uBaudRate);
}
UINT CSuperSerialCard::BaudRateToIndex(UINT uBaudRate)
{
switch (uBaudRate)
{
case CBR_110: return 0x05;
case CBR_300: return 0x06;
case CBR_600: return 0x07;
case CBR_1200: return 0x08;
case CBR_2400: return 0x0A;
case CBR_4800: return 0x0C;
case CBR_9600: return 0x0E;
case CBR_19200: return 0x0F;
case CBR_115200: return 0x00;
}
_ASSERT(0);
return BaudRateToIndex(CBR_9600);
}
//===========================================================================
void CSuperSerialCard::UpdateCommState()
{
if (m_hCommHandle == INVALID_HANDLE_VALUE)
return;
DCB dcb;
ZeroMemory(&dcb,sizeof(DCB));
dcb.DCBlength = sizeof(DCB);
GetCommState(m_hCommHandle,&dcb);
dcb.BaudRate = m_uBaudRate;
dcb.ByteSize = m_uByteSize;
dcb.Parity = m_uParity;
dcb.StopBits = m_uStopBits;
SetCommState(m_hCommHandle,&dcb);
}
//===========================================================================
BOOL CSuperSerialCard::CheckComm()
{
m_dwCommInactivity = 0;
// check for COM or TCP socket handle, and setup if invalid
if (IsActive())
return true;
if (m_dwSerialPortItem == m_uTCPChoiceItemIdx)
{
// init Winsock 1.1 (for Win95, otherwise could use 2.2)
WSADATA wsaData;
if (WSAStartup(MAKEWORD(1, 1), &wsaData) == 0) // or (2, 2) for Winsock 2.2
{
if (wsaData.wVersion != 0x0101) // or 0x0202 for Winsock 2.2
{
WSACleanup();
return FALSE;
}
// initialized, so try to create a socket
m_hCommListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (m_hCommListenSocket == INVALID_SOCKET)
{
WSACleanup();
return FALSE;
}
// have socket so attempt to bind it
SOCKADDR_IN saAddress;
saAddress.sin_family = AF_INET;
saAddress.sin_port = htons(TCP_SERIAL_PORT); // TODO: get from registry / GUI
saAddress.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(m_hCommListenSocket, (LPSOCKADDR)&saAddress, sizeof(saAddress)) == SOCKET_ERROR)
{
m_hCommListenSocket = INVALID_SOCKET;
WSACleanup();
return FALSE;
}
// bound, so listen
if (listen(m_hCommListenSocket, 1) == SOCKET_ERROR)
{
m_hCommListenSocket = INVALID_SOCKET;
WSACleanup();
return FALSE;
}
// now send async events to our app's message handler
if (WSAAsyncSelect(
/* SOCKET s */ m_hCommListenSocket,
/* HWND hWnd */ g_hFrameWindow,
/* unsigned int wMsg */ WM_USER_TCP_SERIAL,
/* long lEvent */ (FD_ACCEPT | FD_CONNECT | FD_READ | FD_CLOSE)) != 0)
{
m_hCommListenSocket = INVALID_SOCKET;
WSACleanup();
return FALSE;
}
}
}
else if (m_dwSerialPortItem)
{
_ASSERT(m_dwSerialPortItem < m_vecSerialPortsItems.size()-1); // size()-1 is TCP item
TCHAR portname[SIZEOF_SERIALCHOICE_ITEM];
wsprintf(portname, TEXT("COM%u"), m_vecSerialPortsItems[m_dwSerialPortItem]);
m_hCommHandle = CreateFile(portname,
GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
(LPSECURITY_ATTRIBUTES)NULL, // default security attributes
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED, // required for WaitCommEvent()
NULL);
if (m_hCommHandle != INVALID_HANDLE_VALUE)
{
//BOOL bRes = SetupComm(m_hCommHandle, 8192, 8192);
//_ASSERT(bRes);
UpdateCommState();
// ReadIntervalTimeout=MAXDWORD; ReadTotalTimeoutConstant=ReadTotalTimeoutMultiplier=0:
// Read operation is to return immediately with the bytes that have already been received,
// even if no bytes have been received.
COMMTIMEOUTS ct;
ZeroMemory(&ct,sizeof(COMMTIMEOUTS));
ct.ReadIntervalTimeout = MAXDWORD;
SetCommTimeouts(m_hCommHandle,&ct);
CommThInit();
}
else
{
DWORD uError = GetLastError();
}
}
return IsActive();
}
//===========================================================================
void CSuperSerialCard::CloseComm()
{
CommTcpSerialCleanup(); // Shut down Winsock
CommThUninit(); // Kill CommThread before closing COM handle
if (m_hCommHandle != INVALID_HANDLE_VALUE)
CloseHandle(m_hCommHandle);
m_hCommHandle = INVALID_HANDLE_VALUE;
m_dwCommInactivity = 0;
}
//===========================================================================
void CSuperSerialCard::CommTcpSerialCleanup()
{
if (m_hCommListenSocket != INVALID_SOCKET)
{
WSAAsyncSelect(m_hCommListenSocket, g_hFrameWindow, 0, 0); // Stop event messages
closesocket(m_hCommListenSocket);
m_hCommListenSocket = INVALID_SOCKET;
CommTcpSerialClose();
WSACleanup();
}
}
//===========================================================================
void CSuperSerialCard::CommTcpSerialClose()
{
if (m_hCommAcceptSocket != INVALID_SOCKET)
{
shutdown(m_hCommAcceptSocket, 2 /* SD_BOTH */); // In case the client is waiting for data
closesocket(m_hCommAcceptSocket);
m_hCommAcceptSocket = INVALID_SOCKET;
}
m_qTcpSerialBuffer.clear();
}
//===========================================================================
void CSuperSerialCard::CommTcpSerialAccept()
{
// Valid listener socket and invalid accept socket?
if ((m_hCommListenSocket != INVALID_SOCKET) && (m_hCommAcceptSocket == INVALID_SOCKET))
{
// Y: accept the connection
m_hCommAcceptSocket = accept(m_hCommListenSocket, NULL, NULL );
}
}
//===========================================================================
void CSuperSerialCard::CommTcpSerialReceive()
{
if (m_hCommAcceptSocket != INVALID_SOCKET)
{
char Data[0x80];
int nReceived = 0;
while ((nReceived = recv(m_hCommAcceptSocket, Data, sizeof(Data), 0)) > 0)
{
for (int i = 0; i < nReceived; i++)
{
m_qTcpSerialBuffer.push_back(Data[i]);
}
}
if (m_bRxIrqEnabled && !m_qTcpSerialBuffer.empty())
{
CpuIrqAssert(IS_SSC);
}
}
}
//===========================================================================
BYTE __stdcall CSuperSerialCard::SSC_IORead(WORD PC, WORD uAddr, BYTE bWrite, BYTE uValue, ULONG nCyclesLeft)
{
UINT uSlot = ((uAddr & 0xff) >> 4) - 8;
CSuperSerialCard* pSSC = (CSuperSerialCard*) MemGetSlotParameters(uSlot);
switch (uAddr & 0xf)
{
case 0x0: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x1: return pSSC->CommDipSw(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x2: return pSSC->CommDipSw(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x3: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x4: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x5: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x6: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x7: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x8: return pSSC->CommReceive(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x9: return pSSC->CommStatus(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xA: return pSSC->CommCommand(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xB: return pSSC->CommControl(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xC: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xD: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xE: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xF: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
}
return 0;
}
BYTE __stdcall CSuperSerialCard::SSC_IOWrite(WORD PC, WORD uAddr, BYTE bWrite, BYTE uValue, ULONG nCyclesLeft)
{
UINT uSlot = ((uAddr & 0xff) >> 4) - 8;
CSuperSerialCard* pSSC = (CSuperSerialCard*) MemGetSlotParameters(uSlot);
switch (uAddr & 0xf)
{
case 0x0: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x1: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x2: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x3: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x4: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x5: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x6: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x7: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x8: return pSSC->CommTransmit(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0x9: return pSSC->CommStatus(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xA: return pSSC->CommCommand(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xB: return pSSC->CommControl(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xC: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xD: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xE: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
case 0xF: return IO_Null(PC, uAddr, bWrite, uValue, nCyclesLeft);
}
return 0;
}
//===========================================================================
// EG. 0x09 = Enable IRQ, No parity [Ref.2]
BYTE __stdcall CSuperSerialCard::CommCommand(WORD, WORD, BYTE write, BYTE value, ULONG)
{
if (!CheckComm())
return 0;
if (write && (value != m_uCommandByte))
{
m_uCommandByte = value;
// UPDATE THE PARITY
if (m_uCommandByte & 0x20)
{
switch (m_uCommandByte & 0xC0)
{
case 0x00 : m_uParity = ODDPARITY; break;
case 0x40 : m_uParity = EVENPARITY; break;
case 0x80 : m_uParity = MARKPARITY; break;
case 0xC0 : m_uParity = SPACEPARITY; break;
}
}
else
{
m_uParity = NOPARITY;
}
if (m_uCommandByte & 0x10) // Receiver mode echo [0=no echo, 1=echo]
{
}
switch (m_uCommandByte & 0x0C) // transmitter interrupt control
{
// Note: the RTS signal must be set 'low' in order to receive any
// incoming data from the serial device
case 0<<2: // set RTS high and transmit no interrupts
m_bTxIrqEnabled = false;
break;
case 1<<2: // set RTS low and transmit interrupts
m_bTxIrqEnabled = true;
break;
case 2<<2: // set RTS low and transmit no interrupts
m_bTxIrqEnabled = false;
break;
case 3<<2: // set RTS low and transmit break signals instead of interrupts
m_bTxIrqEnabled = false;
break;
}
// interrupt request disable [0=enable receiver interrupts] - NOTE: SSC docs get this wrong!
m_bRxIrqEnabled = ((m_uCommandByte & 0x02) == 0);
if (m_uCommandByte & 0x01) // Data Terminal Ready (DTR) setting [0=set DTR high (indicates 'not ready')]
{
// Note that, although the DTR is generally not used in the SSC (it may actually not
// be connected!), it must be set to 'low' in order for the 6551 to function correctly.
}
UpdateCommState();
}
return m_uCommandByte;
}
//===========================================================================
BYTE __stdcall CSuperSerialCard::CommControl(WORD, WORD, BYTE write, BYTE value, ULONG)
{
if (!CheckComm())
return 0;
if (write && (value != m_uControlByte))
{
m_uControlByte = value;
// UPDATE THE BAUD RATE
switch (m_uControlByte & 0x0F)
{
// Note that 1 MHz Apples (everything other than the Apple IIgs and //c
// Plus running in "fast" mode) cannot handle 19.2 kbps, and even 9600
// bps on these machines requires either some highly optimised code or
// a decent buffer in the device being accessed. The faster Apples
// have no difficulty with this speed, however.
case 0x00: m_uBaudRate = CBR_115200; break; // Internal clk: undoc'd 115.2K (or 16x external clock)
case 0x01: // fall through [50 bps]
case 0x02: // fall through [75 bps]
case 0x03: // fall through [109.92 bps]
case 0x04: // fall through [134.58 bps]
case 0x05: m_uBaudRate = CBR_110; break; // [150 bps]
case 0x06: m_uBaudRate = CBR_300; break;
case 0x07: m_uBaudRate = CBR_600; break;
case 0x08: m_uBaudRate = CBR_1200; break;
case 0x09: // fall through [1800 bps]
case 0x0A: m_uBaudRate = CBR_2400; break;
case 0x0B: // fall through [3600 bps]
case 0x0C: m_uBaudRate = CBR_4800; break;
case 0x0D: // fall through [7200 bps]
case 0x0E: m_uBaudRate = CBR_9600; break;
case 0x0F: m_uBaudRate = CBR_19200; break;
}
if (m_uControlByte & 0x10)
{
// receiver clock source [0= external, 1= internal]
}
// UPDATE THE BYTE SIZE
switch (m_uControlByte & 0x60)
{
case 0x00: m_uByteSize = 8; break;
case 0x20: m_uByteSize = 7; break;
case 0x40: m_uByteSize = 6; break;
case 0x60: m_uByteSize = 5; break;
}
// UPDATE THE NUMBER OF STOP BITS
if (m_uControlByte & 0x80)
{
if ((m_uByteSize == 8) && (m_uParity != NOPARITY))
m_uStopBits = ONESTOPBIT;
else if ((m_uByteSize == 5) && (m_uParity == NOPARITY))
m_uStopBits = ONE5STOPBITS;
else
m_uStopBits = TWOSTOPBITS;
}
else
{
m_uStopBits = ONESTOPBIT;
}
UpdateCommState();
}
return m_uControlByte;
}
//===========================================================================
static UINT g_uDbgTotalSSCRx = 0;
BYTE __stdcall CSuperSerialCard::CommReceive(WORD, WORD, BYTE, BYTE, ULONG)
{
if (!CheckComm())
return 0;
BYTE result = 0;
if (!m_qTcpSerialBuffer.empty())
{
result = m_qTcpSerialBuffer.front();
m_qTcpSerialBuffer.pop_front();
}
else if (m_hCommHandle != INVALID_HANDLE_VALUE) // COM
{
EnterCriticalSection(&m_CriticalSection);
{
const UINT uCOMIdx = m_vuRxCurrBuffer;
const UINT uSSCIdx = uCOMIdx ^ 1;
if (!m_qComSerialBuffer[uSSCIdx].empty())
{
result = m_qComSerialBuffer[uSSCIdx].front();
m_qComSerialBuffer[uSSCIdx].pop_front();
UINT uNewSSCIdx = uSSCIdx;
if ( m_qComSerialBuffer[uSSCIdx].empty() && // Current SSC buffer is empty
!m_qComSerialBuffer[uCOMIdx].empty() ) // Current COM buffer has data
{
m_vuRxCurrBuffer = uSSCIdx; // Flip buffers
uNewSSCIdx = uCOMIdx;
}
if (m_bRxIrqEnabled && !m_qComSerialBuffer[uNewSSCIdx].empty())
{
CpuIrqAssert(IS_SSC);
m_vbRxIrqPending = true;
}
}
}
LeaveCriticalSection(&m_CriticalSection);
g_uDbgTotalSSCRx++;
}
return result;
}
//===========================================================================
BYTE __stdcall CSuperSerialCard::CommTransmit(WORD, WORD, BYTE, BYTE value, ULONG)
{
if (!CheckComm())
return 0;
if (m_hCommAcceptSocket != INVALID_SOCKET)
{
BYTE data = value;
if (m_uByteSize < 8)
{
data &= ~(1 << m_uByteSize);
}
send(m_hCommAcceptSocket, (const char*)&data, 1, 0);
m_bWrittenTx = true; // Transmit done
}
else if (m_hCommHandle != INVALID_HANDLE_VALUE)
{
DWORD uBytesWritten;
WriteFile(m_hCommHandle, &value, 1, &uBytesWritten, &m_o);
m_bWrittenTx = true; // Transmit done
}
// TO DO:
// 1) Use CommThread determine when transmit is complete
// 2) OR do this:
//if (m_bTxIrqEnabled)
// CpuIrqAssert(IS_SSC);
return 0;
}
//===========================================================================
// 6551 ACIA Status Register ($C089+s0)
// ------------------------------------
// Bit Value Meaning
// 0 1 Parity error
// 1 1 Framing error
// 2 1 Overrun error
// 3 1 Receive register full
// 4 1 Transmit register empty
// 5 0 Data Carrier Detect (DCD) true [0=DCD low (detected), 1=DCD high (not detected)]
// 6 0 Data Set Ready (DSR) true [0=DSR low (ready), 1=DSR high (not ready)]
// 7 1 Interrupt (IRQ) true (cleared by reading status reg [Ref.4])
enum { ST_PARITY_ERR = 1<<0,
ST_FRAMING_ERR = 1<<1,
ST_OVERRUN_ERR = 1<<2,
ST_RX_FULL = 1<<3,
ST_TX_EMPTY = 1<<4,
ST_DCD = 1<<5,
ST_DSR = 1<<6,
ST_IRQ = 1<<7
};
BYTE __stdcall CSuperSerialCard::CommStatus(WORD, WORD, BYTE, BYTE, ULONG)
{
if (!CheckComm())
return ST_DSR | ST_DCD | ST_TX_EMPTY;
#ifdef SUPPORT_MODEM
DWORD modemstatus = 0;
GetCommModemStatus(m_hCommHandle,&modemstatus); // Returns 0x30 = MS_DSR_ON|MS_CTS_ON
#endif
//
// TO DO - ST_TX_EMPTY:
// . IRQs enabled : set after WaitCommEvent has signaled that TX has completed
// . IRQs disabled : always set it [Currently done]
//
bool bComSerialBufferEmpty = true; // Assume true, so if using TCP then logic below works
if (m_hCommHandle != INVALID_HANDLE_VALUE)
{
EnterCriticalSection(&m_CriticalSection);
const UINT uSSCIdx = m_vuRxCurrBuffer ^ 1;
bComSerialBufferEmpty = m_qComSerialBuffer[uSSCIdx].empty();
}
bool bIRQ = false;
if (m_bTxIrqEnabled && m_bWrittenTx)
{
bIRQ = true;
}
if (m_bRxIrqEnabled)
{
bIRQ = m_vbRxIrqPending;
m_vbRxIrqPending = false; // Ensure 2 reads of STATUS reg only return ST_IRQ for first read
}
m_bWrittenTx = false; // Read status reg always clears IRQ
//
BYTE uStatus = ST_TX_EMPTY
| ((!bComSerialBufferEmpty || !m_qTcpSerialBuffer.empty()) ? ST_RX_FULL : 0x00)
#ifdef SUPPORT_MODEM
| ((modemstatus & MS_RLSD_ON) ? 0x00 : ST_DCD) // Need 0x00 to allow ZLink to start up
| ((modemstatus & MS_DSR_ON) ? 0x00 : ST_DSR)
#endif
| (bIRQ ? ST_IRQ : 0x00);
if (m_hCommHandle != INVALID_HANDLE_VALUE)
{
LeaveCriticalSection(&m_CriticalSection);
}
CpuIrqDeassert(IS_SSC);
return uStatus;
}
//===========================================================================
BYTE __stdcall CSuperSerialCard::CommDipSw(WORD, WORD addr, BYTE, BYTE, ULONG)
{
BYTE sw = 0;
switch (addr & 0xf)
{
case 1: // DIPSW1
sw = (BaudRateToIndex(m_DIPSWCurrent.uBaudRate)<<4) | m_DIPSWCurrent.eFirmwareMode;
break;
case 2: // DIPSW2
// Comms mode - SSC manual, pg23/24
BYTE INT = m_DIPSWCurrent.uStopBits == TWOSTOPBITS ? 1 : 0; // SW2-1 (Stop bits: 1-ON(0); 2-OFF(1))
BYTE DSR = 0; // Always zero
BYTE DCD = m_DIPSWCurrent.uByteSize == 7 ? 1 : 0; // SW2-2 (Data bits: 8-ON(0); 7-OFF(1))
BYTE TDR = 0; // Always zero
// SW2-3 (Parity: odd-ON(0); even-OFF(1))
// SW2-4 (Parity: none-ON(0); SW2-3-OFF(1))
BYTE RDR,OVR;
switch (m_DIPSWCurrent.uParity)
{
case ODDPARITY:
RDR = 0; OVR = 1;
break;
case EVENPARITY:
RDR = 1; OVR = 1;
break;
default:
_ASSERT(0);
case NOPARITY:
RDR = 0; OVR = 0;
break;
}
BYTE FE = m_DIPSWCurrent.bLinefeed ? 1 : 0; // SW2-5 (LF: yes-ON(0); no-OFF(1))
BYTE PE = m_DIPSWCurrent.bInterrupts ? 1 : 0; // SW2-6 (Interrupts: yes-ON(0); no-OFF(1))
sw = (INT<<7) | (DSR<<6) | (DCD<<5) | (TDR<<4) | (RDR<<3) | (OVR<<2) | (FE<<1) | (PE<<0);
break;
}
return sw;
}
//===========================================================================
void CSuperSerialCard::CommInitialize(LPBYTE pCxRomPeripheral, UINT uSlot)
{
const UINT SSC_FW_SIZE = 2*1024;
const UINT SSC_SLOT_FW_SIZE = 256;
const UINT SSC_SLOT_FW_OFFSET = 7*256;
HRSRC hResInfo = FindResource(NULL, MAKEINTRESOURCE(IDR_SSC_FW), "FIRMWARE");
if(hResInfo == NULL)
return;
DWORD dwResSize = SizeofResource(NULL, hResInfo);
if(dwResSize != SSC_FW_SIZE)
return;
HGLOBAL hResData = LoadResource(NULL, hResInfo);
if(hResData == NULL)
return;
BYTE* pData = (BYTE*) LockResource(hResData); // NB. Don't need to unlock resource
if(pData == NULL)
return;
memcpy(pCxRomPeripheral + uSlot*256, pData+SSC_SLOT_FW_OFFSET, SSC_SLOT_FW_SIZE);
// Expansion ROM
if (m_pExpansionRom == NULL)
{
m_pExpansionRom = new BYTE [SSC_FW_SIZE];
if (m_pExpansionRom)
memcpy(m_pExpansionRom, pData, SSC_FW_SIZE);
}
//
RegisterIoHandler(uSlot, &CSuperSerialCard::SSC_IORead, &CSuperSerialCard::SSC_IOWrite, NULL, NULL, this, m_pExpansionRom);
}
//===========================================================================
void CSuperSerialCard::CommReset()
{
CloseComm();
InternalReset();
}
//===========================================================================
void CSuperSerialCard::CommDestroy()
{
CommReset();
delete [] m_pExpansionRom;
m_pExpansionRom = NULL;
}
//===========================================================================
// dwNewSerialPortItem is the drop-down list item
void CSuperSerialCard::CommSetSerialPort(HWND hWindow, DWORD dwNewSerialPortItem)
{
if (m_dwSerialPortItem == dwNewSerialPortItem)
return;
_ASSERT(!IsActive());
if (IsActive())
return;
m_dwSerialPortItem = dwNewSerialPortItem;
if (m_dwSerialPortItem == m_uTCPChoiceItemIdx)
strcpy(m_ayCurrentSerialPortName, TEXT_SERIAL_TCP);
else if (m_dwSerialPortItem != 0)
sprintf(m_ayCurrentSerialPortName, TEXT_SERIAL_COM"%d", m_vecSerialPortsItems[m_dwSerialPortItem]);
else
m_ayCurrentSerialPortName[0] = 0; // "None"
}
//===========================================================================
void CSuperSerialCard::CommUpdate(DWORD totalcycles)
{
if (!IsActive())
return;
if ((m_dwCommInactivity += totalcycles) > 1000000)
{
static DWORD lastcheck = 0;
if ((m_dwCommInactivity > 2000000) || (m_dwCommInactivity-lastcheck > 99950))
{
#ifdef SUPPORT_MODEM
DWORD modemstatus = 0;
GetCommModemStatus(m_hCommHandle,&modemstatus);
if ((modemstatus & MS_RLSD_ON) || DiskIsSpinning())
m_dwCommInactivity = 0;
#else
if (DiskIsSpinning())
m_dwCommInactivity = 0;
#endif
}
//if (m_dwCommInactivity > 2000000)
// CloseComm();
}
}
//===========================================================================
// Had this error when sizeof(m_RecvBuffer)==1 was used
// UPDATE: Fixed by using double-buffered queue
//
// ERROR_OPERATION_ABORTED: CE_RXOVER
//
// Config:
// . DOS Box (laptop) -> ZLink (PC)
// . Baud = 300/4800/9600/19200
// . InQueue size = 0x1000
// . AppleII speed = 1MHz/2MHz/Unthrottled
// . TYPE AW-PascalCrash.txt >COM7
// . NB. AW-PascalCrash.txt is 10020 bytes
//
// Error:
// . Always get ERROR_OPERATION_ABORTED after reading 0x555 total bytes
// . dwErrors = 1 (CE_RXOVER)
// . COMSTAT::InQueue = 0x1000
//
static UINT g_uDbgTotalCOMRx = 0;
void CSuperSerialCard::CheckCommEvent(DWORD dwEvtMask)
{
if (dwEvtMask & EV_RXCHAR)
{
char Data[0x80];
DWORD dwReceived = 0;
bool bGotData = false;
// Read COM buffer until empty
// NB. Potentially dangerous, as Apple read rate might be too slow, so could run out of memory on PC!
do
{
if (!ReadFile(m_hCommHandle, Data, sizeof(Data), &dwReceived, &m_o) || !dwReceived)
break;
g_uDbgTotalCOMRx += dwReceived;
bGotData = true;
EnterCriticalSection(&m_CriticalSection);
{
const UINT uCOMIdx = m_vuRxCurrBuffer;
for (DWORD i = 0; i < dwReceived; i++)
m_qComSerialBuffer[uCOMIdx].push_back(Data[i]);
}
LeaveCriticalSection(&m_CriticalSection);
}
while(sizeof(Data) == dwReceived);
//
if (bGotData)
{
EnterCriticalSection(&m_CriticalSection);
{
// NB. m_vuRxCurrBuffer may've changed since ReadFile() above -- can change in CommReceive()
// - Maybe buffers have already been flipped
const UINT uCOMIdx = m_vuRxCurrBuffer;
const UINT uSSCIdx = uCOMIdx ^ 1;
if ( m_qComSerialBuffer[uSSCIdx].empty() && // Current SSC buffer is empty
!m_qComSerialBuffer[uCOMIdx].empty() ) // Current COM buffer has data
{
m_vuRxCurrBuffer = uSSCIdx; // Flip buffers
if (m_bRxIrqEnabled)
{
CpuIrqAssert(IS_SSC);
m_vbRxIrqPending = true;
}
}
}
LeaveCriticalSection(&m_CriticalSection);
}
}
//else if (dwEvtMask & EV_TXEMPTY)
//{
// if (m_bTxIrqEnabled)
// {
// m_vbTxIrqPending = true;
// CpuIrqAssert(IS_SSC);
// }
//}
}
DWORD WINAPI CSuperSerialCard::CommThread(LPVOID lpParameter)
{
CSuperSerialCard* pSSC = (CSuperSerialCard*) lpParameter;
char szDbg[100];
// BOOL bRes = SetCommMask(pSSC->m_hCommHandle, EV_TXEMPTY | EV_RXCHAR);
BOOL bRes = SetCommMask(pSSC->m_hCommHandle, EV_RXCHAR); // Just RX
if (!bRes)
return -1;
//
const UINT nNumEvents = 2;
HANDLE hCommEvent_Wait[nNumEvents] = {pSSC->m_hCommEvent[COMMEVT_WAIT], pSSC->m_hCommEvent[COMMEVT_TERM]};
HANDLE hCommEvent_Ack[nNumEvents] = {pSSC->m_hCommEvent[COMMEVT_ACK], pSSC->m_hCommEvent[COMMEVT_TERM]};
while(1)
{
DWORD dwEvtMask = 0;
DWORD dwWaitResult;
bRes = WaitCommEvent(pSSC->m_hCommHandle, &dwEvtMask, &pSSC->m_o); // Will return immediately (probably with ERROR_IO_PENDING)
_ASSERT(!bRes);
if (!bRes)
{
DWORD dwRet = GetLastError();
_ASSERT(dwRet == ERROR_IO_PENDING);
if (dwRet != ERROR_IO_PENDING)
{
// Probably: ERROR_OPERATION_ABORTED
DWORD dwErrors;
COMSTAT Stat;
ClearCommError(pSSC->m_hCommHandle, &dwErrors, &Stat);
if (dwErrors)
{
if (dwErrors & CE_RXOVER)
sprintf(szDbg, "CommThread: Err=CE_RXOVER (0x%08X): InQueue=0x%08X\n", dwErrors, Stat.cbInQue);
else
sprintf(szDbg, "CommThread: Err=Other (0x%08X): InQueue=0x%08X, OutQueue=0x%08X\n", dwErrors, Stat.cbInQue, Stat.cbOutQue);
OutputDebugString(szDbg);
if (g_fh)
fprintf(g_fh, szDbg);
}
return -1;
}
//
// Wait for comm event
//
while(1)
{
//OutputDebugString("CommThread: Wait1\n");
dwWaitResult = WaitForMultipleObjects(
nNumEvents, // number of handles in array
hCommEvent_Wait, // array of event handles
FALSE, // wait until any one is signaled
INFINITE);
// On very 1st wait *only*: get a false signal (when not running via debugger)
if ((dwWaitResult == WAIT_OBJECT_0) && (dwEvtMask == 0))
continue;
if ((dwWaitResult >= WAIT_OBJECT_0) && (dwWaitResult <= WAIT_OBJECT_0+nNumEvents-1))
break;
}
dwWaitResult -= WAIT_OBJECT_0; // Determine event # that signaled
//sprintf(szDbg, "CommThread: GotEvent1: %d\n", dwWaitResult); OutputDebugString(szDbg);
if (dwWaitResult == (nNumEvents-1))
break; // Termination event
}
// Comm event
pSSC->CheckCommEvent(dwEvtMask);
}
return 0;
}
bool CSuperSerialCard::CommThInit()
{
_ASSERT(m_hCommThread == NULL);
_ASSERT(m_hCommHandle);
if ((m_hCommEvent[0] == NULL) && (m_hCommEvent[1] == NULL) && (m_hCommEvent[2] == NULL))
{
// Create an event object for use by WaitCommEvent
m_o.hEvent = CreateEvent(
NULL, // default security attributes
FALSE, // auto reset event (bManualReset)
FALSE, // not signaled (bInitialState)
NULL // no name
);
// Initialize the rest of the OVERLAPPED structure to zero
m_o.Internal = 0;
m_o.InternalHigh = 0;
m_o.Offset = 0;
m_o.OffsetHigh = 0;
//
m_hCommEvent[COMMEVT_WAIT] = m_o.hEvent;
m_hCommEvent[COMMEVT_ACK] = CreateEvent(NULL, // lpEventAttributes
FALSE, // bManualReset (FALSE = auto-reset)
FALSE, // bInitialState (FALSE = non-signaled)
NULL); // lpName
m_hCommEvent[COMMEVT_TERM] = CreateEvent(NULL, // lpEventAttributes
FALSE, // bManualReset (FALSE = auto-reset)
FALSE, // bInitialState (FALSE = non-signaled)
NULL); // lpName
if ((m_hCommEvent[0] == NULL) || (m_hCommEvent[1] == NULL) || (m_hCommEvent[2] == NULL))
{
if(g_fh) fprintf(g_fh, "Comm: CreateEvent failed\n");
return false;
}
}
//
if (m_hCommThread == NULL)
{
DWORD dwThreadId;
m_hCommThread = CreateThread(NULL, // lpThreadAttributes
0, // dwStackSize
(LPTHREAD_START_ROUTINE) &CSuperSerialCard::CommThread,
this, // lpParameter
0, // dwCreationFlags : 0 = Run immediately
&dwThreadId); // lpThreadId
SetThreadPriority(m_hCommThread, THREAD_PRIORITY_TIME_CRITICAL);
InitializeCriticalSection(&m_CriticalSection);
}
return true;
}
void CSuperSerialCard::CommThUninit()
{
if (m_hCommThread)
{
SetEvent(m_hCommEvent[COMMEVT_TERM]); // Signal to thread that it should exit
do
{
DWORD dwExitCode;
if(GetExitCodeThread(m_hCommThread, &dwExitCode))
{
if(dwExitCode == STILL_ACTIVE)
Sleep(10);
else
break;
}
}
while(1);
CloseHandle(m_hCommThread);
m_hCommThread = NULL;
DeleteCriticalSection(&m_CriticalSection);
}
//
for (UINT i=0; i<COMMEVT_MAX; i++)
{
if(m_hCommEvent[i])
{
CloseHandle(m_hCommEvent[i]);
m_hCommEvent[i] = NULL;
}
}
}
//===========================================================================
void CSuperSerialCard::ScanCOMPorts()
{
m_vecSerialPortsItems.clear();
m_vecSerialPortsItems.push_back(SERIALPORTITEM_INVALID_COM_PORT); // "None"
for (UINT i=1; i<32; i++) // Arbitrary upper limit
{
TCHAR portname[SIZEOF_SERIALCHOICE_ITEM];
wsprintf(portname, TEXT("COM%u"), i);
HANDLE hCommHandle = CreateFile(portname,
GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
(LPSECURITY_ATTRIBUTES)NULL, // default security attributes
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED, // required for WaitCommEvent()
NULL);
if (hCommHandle != INVALID_HANDLE_VALUE)
{
CloseHandle(hCommHandle);
m_vecSerialPortsItems.push_back(i);
}
}
//
m_vecSerialPortsItems.push_back(SERIALPORTITEM_INVALID_COM_PORT); // "TCP"
m_uTCPChoiceItemIdx = m_vecSerialPortsItems.size()-1;
}
char* CSuperSerialCard::GetSerialPortChoices()
{
if (IsActive())
return m_aySerialPortChoices;
//
ScanCOMPorts(); // Do this every time in case news ones available (eg. for USB COM ports)
delete [] m_aySerialPortChoices;
m_aySerialPortChoices = new TCHAR [ GetNumSerialPortChoices() * SIZEOF_SERIALCHOICE_ITEM + 1 ]; // +1 for final NULL item
TCHAR* pNextSerialChoice = m_aySerialPortChoices;
//
pNextSerialChoice += wsprintf(pNextSerialChoice, TEXT("None"));
pNextSerialChoice++; // Skip NULL char
for (UINT i=1; i<m_uTCPChoiceItemIdx; i++)
{
pNextSerialChoice += wsprintf(pNextSerialChoice, TEXT("COM%u"), m_vecSerialPortsItems[i]);
pNextSerialChoice++; // Skip NULL char
}
pNextSerialChoice += wsprintf(pNextSerialChoice, TEXT("TCP"));
pNextSerialChoice++; // Skip NULL char
*pNextSerialChoice = 0;
//
return m_aySerialPortChoices;
}
// Called by LoadConfiguration()
void CSuperSerialCard::SetSerialPortName(const char* pSerialPortName)
{
strncpy(m_ayCurrentSerialPortName, pSerialPortName, SIZEOF_SERIALCHOICE_ITEM);
// Init m_aySerialPortChoices, so that we have choices to show if serial is active when we 1st open Config dialog
GetSerialPortChoices();
if (strncmp(TEXT_SERIAL_COM, pSerialPortName, sizeof(TEXT_SERIAL_COM)-1) == 0)
{
const char* p = &pSerialPortName[ sizeof(TEXT_SERIAL_COM)-1 ];
const int nCOMPort = atoi(p);
m_dwSerialPortItem = 0;
for (UINT i=0; i<m_vecSerialPortsItems.size(); i++)
{
if (m_vecSerialPortsItems[i] == nCOMPort)
{
m_dwSerialPortItem = i;
break;
}
}
//_ASSERT(m_dwSerialPortItem); // EG. Switched a USB COM port from COM7 to COM8 between AppleWin sessions
if (m_dwSerialPortItem >= GetNumSerialPortChoices())
{
_ASSERT(0);
m_dwSerialPortItem = 0;
}
}
else if (strncmp(TEXT_SERIAL_TCP, pSerialPortName, sizeof(TEXT_SERIAL_TCP)-1) == 0)
{
m_dwSerialPortItem = m_uTCPChoiceItemIdx;
}
else
{
m_ayCurrentSerialPortName[0] = 0; // "None"
m_dwSerialPortItem = 0;
}
}
//===========================================================================
DWORD CSuperSerialCard::CommGetSnapshot(SS_IO_Comms* pSS)
{
pSS->baudrate = m_uBaudRate;
pSS->bytesize = m_uByteSize;
pSS->commandbyte = m_uCommandByte;
pSS->comminactivity = m_dwCommInactivity;
pSS->controlbyte = m_uControlByte;
pSS->parity = m_uParity;
// memcpy(pSS->recvbuffer, m_RecvBuffer, uRecvBufferSize);
pSS->recvbytes = 0;
pSS->stopbits = m_uStopBits;
return 0;
}
DWORD CSuperSerialCard::CommSetSnapshot(SS_IO_Comms* pSS)
{
m_uBaudRate = pSS->baudrate;
m_uByteSize = pSS->bytesize;
m_uCommandByte = pSS->commandbyte;
m_dwCommInactivity = pSS->comminactivity;
m_uControlByte = pSS->controlbyte;
m_uParity = pSS->parity;
// memcpy(m_RecvBuffer, pSS->recvbuffer, uRecvBufferSize);
// m_vRecvBytes = pSS->recvbytes;
m_uStopBits = pSS->stopbits;
return 0;
}
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