Чтение из LPT

// lpt_read.cpp : 
 
#include  stdio.h;
#include  conio.h;
#include  winuser.h;
 
#include  "stdafx.h"
 
//#define __USE_PORTTALK__
 
#ifdef __USE_PORTTALK__
#include  "porttalk/PortTalk_IOCTL.h"
#else
#include  "winio/winio.h"
#endif
 
float   RotAngle_Step, RotAngle_Start, RotAngle_End, RotAngle;
FILE    *file_output;
 
// Initialiazes the LPT port
void LPT_Init( void )
{
#ifdef __USE_PORTTALK__
    outportb( 0x378, 0x08 );
    outportb( 0x378, 0x0C );
#else
    SetPortVal( 0x378, 0x08, 1 );
    SetPortVal( 0x378, 0x0C, 1 );
#endif
}
 
// Writes to the LPT port
void LPT_Write( unsigned char value )
{
#ifdef __USE_PORTTALK__
    outportb( 0x378, value );
#else
    SetPortVal( 0x378, value, 1 );
#endif
}
 
// Gets status from the LPT port
unsigned char LPT_GetStatus( void )
{
#ifdef __USE_PORTTALK__
    return inportb( 0x379 );
#else
    DWORD   d_port_data;
    GetPortVal( 0x379, &d_port_data, 1 );
    return (unsigned char)d_port_data;
#endif
}
 
// Receives necessary data 
long Receive( void )
{
    unsigned char value;
    long counter = 0;
 
    printf( "Reading data from LPT port ... " );
    do
    {
        value = LPT_GetStatus();
        if ( value & 32 )
        {   
            counter++;
            // Skip all the numbers which have the 6th bit set
            do
            {
                value = LPT_GetStatus();
            } while ( value & 32 );
        }
        // do until the 5th bit is not set
        value = LPT_GetStatus();
    } while ( value & 16 );
    printf( "\r" );
    
    return counter;
}
 
void Init( void )
{
    printf( "Rotation angle step, Step = " );
    scanf( "%f", &RotAngle_Step );
    printf( "Initial angle, Start = " );
    scanf( "%f", &RotAngle_Start );
    printf( "End angle, End = " );
    scanf( "%f", &RotAngle_End );
    
    RotAngle = RotAngle_Start - RotAngle_Step;
 
    file_output = fopen( "output.txt", "w" );
 
    printf( "\n" );
}
 
int __cdecl main( void )
{
    unsigned char   status;
    long            counter;
 
    
#ifdef __USE_PORTTALK__
    if ( OpenPortTalk() == -1 )
    {
        printf( "OpenPortTalk() failed to install the porttalk.sys driver\n\n" );
        return 1;
    }
#else
    if ( InitializeWinIo() == false )
    {
        printf( "InitializeWinIo() failed to install the WinIo.sys driver\n\n" );
        return 1;
    }
#endif
    
    Init();
 
    LPT_Write( 0 );
    LPT_Init();
 
    do 
    {
        status = LPT_GetStatus();
        if ( status & 16 )
        {
            counter = Receive();
            RotAngle += RotAngle_Step;
            printf( "Angle: %5.3f     Value: %ld\n", RotAngle, counter );
            fprintf( file_output, "%5.3f     %ld\n", RotAngle, counter );
        }
    } while ( RotAngle + RotAngle_Step = RotAngle_End );
 
    LPT_Write( 1 );
 
#ifdef __USE_PORTTALK__
    ClosePortTalk();
#else
    ShutdownWinIo();
#endif
    fclose( file_output );
    printf( "\nDone\n" );
 
    return 0;
}