/*****************************************************************************
 *  This sample program will sequentially turn on all bits of port 0 of the  *
 *  IOD64 and then sequentially turn them off.  Each time it sets a new bit, *
 *  both port 0 and port 1 are read and the data displayed.  This            *
 *  demonstrates how to read and write to a port, and to use the read back   *
 *  function of the board.                                                   *
 *****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <conio.h>
#include <dos.h>

/* these are the port address offsets for reading and writing to the IOD64 */
unsigned int Port0;
unsigned int Port1;
unsigned int Control;

/* this typedef allow use to duplicate the boolean type as used in pascal */

typedef enum {FALSE,TRUE} boolean;

/*****************************************************************************
 *  FUNCTION: signon -- local routine                                        *
 *  PURPOSE: To display an initial sign on message on the screen.           *
 *****************************************************************************/
void signon(void)
{
#define L1 " A C C E S  I O D 6 4   C A R D  S A M P L E  P R O G R A M "
#define L4 " PORT 0 OUTPUT    PORT 0 INPUT    PORT 1 INPUT"
#define L5 " -------------    ------------    ------------"
#define L6 " PRESS ANY KEY TO EXIT PROGRAM "

int	index;

/* print the string display */
clrscr();

gotoxy(13,1);
printf("%s",L1);
gotoxy(17,6);
printf("%s",L4);
gotoxy(17,7);
printf("%s",L5);
gotoxy(27,10);
printf("%s",L6);
} /* end signon */

/*****************************************************************************
 *  FUNCTION: write_port_data -- local routine                               *
 *  PURPOSE: Displays the current port values on the screen.                *
 *****************************************************************************/
void write_port_data(unsigned char current[3])
{
unsigned      x,y,index1,index;
unsigned char value;

x = 20;    /* x coordinate to write value to screen */
y = 8;
for (index = 0;index <= 2;index++)       /* for each array member */
   {
   value = current[index];
   for (index1 = 0;index1 <= 7;index1++) /* for each bit in array member */
      {
      gotoxy(x,y);
      if (value % 2) putchar('1');
      else putchar('0');
      value = value >> 1;                /* roll next diaplay bit */
      x++;
      }
   x+= 10;
   }
}  /* end write_port_data */

/******************************************************************************
Function    AskForBaseAddress
Purpose:    This function allows the user to input the address of the
	         card.
*****************************************************************************/

unsigned AskForBaseAddress(unsigned int OldOne)
{
	char msg[7];
	int NewOne = 0, Success = 0, Dummy;
	int AddrInputPosX, AddrInputPosY;

	puts("\nPlease enter the Base Address for your card (in hex)");
	printf("or press ENTER for %X.\n>", OldOne);
	AddrInputPosX = wherex(); AddrInputPosY = wherey();
	do {
      gotoxy(AddrInputPosX, AddrInputPosY);
      clreol();
      msg[0] = 5; msg[1] = 0;
      cgets(msg);
      sscanf(msg + 2, "%x", &NewOne);
      Success = 1;
      Dummy = NewOne;
		if (msg[1] == 0) {
        gotoxy(AddrInputPosX, AddrInputPosY);
        printf("%X", OldOne);
        Success = 1;
        Dummy = OldOne;
      }
	} while(!Success);
	return (Dummy);
} /* end of AskForBaseAddress */


/*****************************************************************************
 *  FUNCTION: main -- external routine                                       *
 *****************************************************************************/
void main()
{
unsigned char           current[3];
boolean			shift_left;

clrscr();
puts("                         MODULE : SAMPLE1.C");
puts("");
puts("This sample program will sequentially turn on all bits of port 0 of the");
puts("IOD64 and then sequentially turn them off.  Each time it sets a new bit,");
puts("both port 0 and port 1 are read and the data displayed.  This");
puts("demonstrates how to read and write to a port, and to use the read back");
puts("function of the board.");
gotoxy(1,9);
puts("COM ADDRESS");
Port0 = AskForBaseAddress(0x300);

Port1 = Port0 + 1;
Control = Port0 + 8;

clrscr();
printf("\n\n\nBoard Configuration:\n\n");
printf(" -- Base Address is %X hex\n", Port0);
printf(" -- All remaining jumper settings are irrelevant.\n\n\n");
printf("Press a key to continue");
getch();

signon();                          /* print the start up message         */
current[0] = 0;
shift_left = TRUE;

outportb(Control,0x01);
while(!kbhit())                    /* loop until key pressed             */
   {
   outportb(Port0,current[0]);     /* write value to relay output        */
   delay(10);
   current[1] = inportb(Port0);    /* read back what we wrote to relays  */
   current[2] = inportb(Port1);    /* read the data on OPTO INPUTS       */
   write_port_data(current);       /* write new data to screen           */
   delay(700);

   /* compute value to turn on/off nesxt bit in line */
   if (current[0] == 0) shift_left = TRUE;
   if (current[0] == 255) shift_left = FALSE;
   if (shift_left) current[0] = (current[0] << 1) + 1;
   else current[0] = (current[0] - 1) >> 1;
   };
clrscr();
} /* end main program */