/* ******************************************************************
	This command configures a port as an input or output.
	The Direction field can be either DIGITALIN or DIGITALOUT
	depending on whether the port is to be configured as an
	input or output.  Valid ports are PORTA, PORTB, PORTCL and
	PORTCH.  Direction bit can be either DIGITALIN or DIGITALOUT.
********************************************************************** */
int DConfigPort(int Port, int Direction)
{
	int mask, OldByte, NewByte;

	OldByte = inb(DCONFIGPORT); /*read the current value in register*/

	switch (Direction)
	{
	case DIGITALIN: /* determine mask for DIGITALIN */
		if (Port == PORTA)
			mask = 0x10;

		else if (Port == PORTB)
			mask = 0x02;

		else if (Port == PORTCL)
			mask = 0x01;

		else if (Port == PORTCH)
			{
			mask = 0x08;
			Port = 0x30e;
			}
		else
			return(2); /* error - not valid port */

		NewByte = OldByte | mask; /* new data for register */

		break;

	case DIGITALOUT: /* determine mask for DIGITALOUT */
		if (Port == PORTA)
			mask = 0xef;

		else if (Port == PORTB)
			mask = 0xfd;

		else if (Port == PORTCL)
			mask = 0xfe;

		else if (Port == PORTCH)
		{	mask = 0xf7;
			Port = 0x30e;
		}	

		else
			return(2); /* error - not a valid port */

		NewByte = OldByte & mask; /* new value for register */
		
		break;
	
	default:
		return(1); /* error - not a valid direction */
		break;
	}
	
	printf("The value of NewByte is --> %x.\n", NewByte);
	outb(NewByte, DCONFIGPORT); /* write config data to register */

	return(0); /* no errors detected */
}