/* *******************************************************************
	This function reads the byte value of the specified port
	and returns the result in the variable pointer sent to the
	function.  Valid ports are PORTA, PORTB, PORTCL and PORTCH.
*********************************************************************** */

int DIn(int Port, int *Value)   
{
	int result;
	int BitData;

	switch (Port)
	{
	case PORTA:
		result = DBitIn(Port, 4, &BitData);
		
		printf("The value of BitData is --> %d.\n", BitData);	
		if (BitData == 0)
			return(3); /* error - not configured for input */
		break;
	case PORTB:
		result = DBitIn(Port, 1, &BitData);
		if (BitData == 0)
			return(3); /* error - not configured for input */
		break;
	case PORTCL:
		result = DBitIn(Port, 0, &BitData);
		if (BitData == 0)
			return(3); /* error - not configured for input */
		break;
	case PORTCH:
		result = DBitIn(Port, 3, &BitData);
		if (BitData == 0)
			return(3); /* error - not configured for input */
		break;
	default:
		return (0); /* error - illegal port */
		break;
	}
	*Value = inb(Port); /* read the port data */

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