/*****************************************************************************
 *                          MODULE: IOD48FCT.C                               *
 *                                                                           *
 *  The purpose of this module is to provide direct software interface to    *
 *  the IOD-48s digital board.                                               *
 *                                                                           *
 *  LAST MODIFICATION: JULY 31, 1992                                         *
 *									                                                         *
 *****************************************************************************/
#include <stdio.h>
#include <conio.h>
#include <dos.h>

/* these are the port address offsets for reading and control of the IOD48 */
#define PORT0A       0x0000
#define PORT0B       0x0001
#define PORT0C       0x0002
#define PORT0CONTROL 0x0003
#define PORT1A       0x0004
#define PORT1B       0x0005
#define PORT1C       0x0006
#define PORT1CONTROL 0x0007
#define COSENABLE    0x000B
#define CLRCOSINT    0x000F

/*****************************************************************************
 *  FUNCTION: IOD48_cos_enable -- export routine                             *
 *                                                                           *
 *   PURPOSE: To write the enable word passed to it to the IOD48 board.  See *
 *            IOD48 board manual for more information.                       *
 *                                                                           *
 *     INPUT: unsigned port: contains the board port address.                *
 *               char value: control value to write.                         *
 *                                                                           *
 *    OUTPUT: None.                                                          *
 *                                                                           *
 *    CALLS: None.                                                           *
 *                                                                           *
 *****************************************************************************/
void IOD48_cos_enable(unsigned port,char value)
{
outportb(port + COSENABLE,value);      /* send the byte */
}  /* end IOD48_cos_enable */

/*****************************************************************************
 *  FUNCTION: IOD48_clr_cos_int -- export routine                            *
 *                                                                           *
 *   PURPOSE: To write anything to this board address, clears any interrupts *
 *            caused by change of state.                                     *
 *                                                                           *
 *     INPUT: unsigned port: contains the board port address.                *
 *                                                                           *
 *    OUTPUT: None.                                                          *
 *                                                                           *
 *    CALLS: None.                                                           *
 *                                                                           *
 *****************************************************************************/
void IOD48_clr_cos_int(unsigned port)
{
outportb(port + CLRCOSINT,0);      /* send anything */
}  /* end IOD48_clr_cos_int */

/*****************************************************************************
 *  FUNCTION: IOD48_read_port -- export routine                              *
 *                                                                           *
 *   PURPOSE: Reads the value contained at one of the 6 ports contained on   *
 *            the IOD48 board.                                               *
 *                                                                           *
 *     INPUT: unsigned port: contains the board port address.                *
 *            unsigned offset: determines which port to read.                *
 *                                                                           *
 *    OUTPUT: Returns the value read in from the board.                      *
 *                                                                           *
 *    CALLS: None.                                                           *
 *                                                                           *
 *****************************************************************************/
unsigned IOD48_read_port(unsigned port,unsigned offset)
{
unsigned value;

value = inportb(port + offset);
return(value);
}   /* end IOD48_read_port */

/*****************************************************************************
 *  FUNCTION: IOD48_port_control -- export routine                           *
 *                                                                           *
 *   PURPOSE: Writes the control word to the PPI indicated by offset.  This  *
 *            word determines the direction of digital I/O as well mode.     *
 *            See IOD48 manual for more information.                         *
 *                                                                           *
 *     INPUT: unsigned port: contains the board port address.                *
 *            unsigned offset: determines which PPI to write to.             *
 *            char value: control word to write.                             *
 *                                                                           *
 *    OUTPUT: None.                                                          *
 *                                                                           *
 *    CALLS: None.                                                           *
 *                                                                           *
 *****************************************************************************/
void IOD48_port_control(unsigned port,unsigned offset,char value)
{
outportb(port + offset,value);      /* send the byte */
}  /* end IOD48_port_control */