source: xtideuniversalbios/trunk/Serial_Server/win32/Win32Serial.h@ 231

//======================================================================
//
// Project:     XTIDE Universal BIOS, Serial Port Server
//
// File:        Win32Serial.h - Microsoft Windows serial code
//

#include <stdio.h>
#include "windows.h"
#include "../library/library.h"

#define PIPENAME "\\\\.\\pipe\\xtide"

class SerialAccess 
{
public:
    void Connect( char *name, struct baudRate *p_baudRate )
    {
        char buff1[20], buff2[1024];

        baudRate = p_baudRate;

        pipe = NULL;
    
        if( !name )
        {
            for( int t = 1; t <= 30 && !name; t++ )
            {
                sprintf( buff1, "COM%d", t );
                if( QueryDosDeviceA( buff1, buff2, sizeof(buff2) ) )
                    name = buff1;
            }
            if( !name )
                log( -1, "No physical COM ports found" );
        }

        if( !strcmp( name, "PIPE" ) )
        {
            log( 0, "Opening named pipe %s (simulating %lu baud)", PIPENAME, baudRate->rate );
        
            pipe = CreateNamedPipeA( PIPENAME, PIPE_ACCESS_DUPLEX, PIPE_TYPE_BYTE|PIPE_REJECT_REMOTE_CLIENTS, 2, 1024, 1024, 0, NULL );
            if( pipe == INVALID_HANDLE_VALUE )
                log( -1, "Could not CreateNamedPipe " PIPENAME );
        
            if( !ConnectNamedPipe( pipe, NULL ) )
                log( -1, "Could not ConnectNamedPipe" );

            if( baudRate->divisor > 3 )
                log( -1, "Cannot simulate baud rates with hardware multipliers" );

            speedEmulation = 1;
            resetConnection = 1;
        }
        else
        {
            if( QueryDosDeviceA( name, buff2, sizeof(buff2) ) )
            {
                COMMTIMEOUTS timeouts;
                DCB dcb;

                log( 0, "Opening %s (%lu baud)", name, baudRate->rate );
            
                pipe = CreateFileA( name, GENERIC_READ|GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
                if( pipe == INVALID_HANDLE_VALUE )
                    log( -1, "Could not Open \"%s\"", name );
            
                FillMemory(&dcb, sizeof(dcb), 0);
                FillMemory(&timeouts, sizeof(timeouts), 0);

                dcb.DCBlength = sizeof(dcb);
                dcb.BaudRate = baudRate->rate;
                dcb.ByteSize = 8;
                dcb.StopBits = ONESTOPBIT;
                dcb.Parity = NOPARITY;
                if( !SetCommState( pipe, &dcb ) )
                    log( -1, "Could not SetCommState" );

                if( !SetCommTimeouts( pipe, &timeouts ) )
                    log( -1, "Could not SetCommTimeouts" );
            }
            else
            {
                char logbuff[ 1024 ];
                int found = 0;

                sprintf( logbuff, "serial port '%s' not found, detected COM ports:", name );

                for( int t = 1; t <= 40; t++ )
                {
                    sprintf( buff1, "COM%d", t );
                    if( QueryDosDeviceA( buff1, buff2, sizeof(buff2) ) )
                    {
                        strcat( logbuff, "\n    " );
                        strcat( logbuff, buff1 );
                        found = 1;
                    }
                }
                if( !found )
                    strcat( logbuff, "\n    (none)" );
                
                log( -1, logbuff );
            }
        }
    }

    void Disconnect()
    {
        if( pipe )
        {
            CloseHandle( pipe );
            pipe = NULL;
        }
    }

    unsigned long readCharacters( void *buff, unsigned long len )
    {
        unsigned long readLen;
        int ret;

        ret = ReadFile( pipe, buff, len, &readLen, NULL );

        if( !ret || readLen == 0 )
        {
            if( GetLastError() == ERROR_BROKEN_PIPE )
                return( 0 );
            else
                log( -1, "read serial failed (error code %d)", GetLastError() );
        }

        return( readLen );
    }

    int writeCharacters( void *buff, unsigned long len )
    {
        unsigned long writeLen;
        int ret;

        ret = WriteFile( pipe, buff, len, &writeLen, NULL );

        if( !ret || len != writeLen )
        {
            if( GetLastError() == ERROR_BROKEN_PIPE )
                return( 0 );
            else
                log( -1, "write serial failed (error code %d)", GetLastError() );
        }

        return( 1 );
    }

    SerialAccess()
    {
        pipe = NULL;
        speedEmulation = 0;
        resetConnection = 0;
        baudRate = NULL;
    }

    ~SerialAccess()
    {
        Disconnect();
    }

    int speedEmulation;
    int resetConnection;

    struct baudRate *baudRate;

private:
    HANDLE pipe;
};