fio.c

i2s usb audio demo lpc2138

/*****************************************************************************
 *   fio.c:  Fast I/O module file for NXP LPC23xx Family Microprocessors
 *
 *   Copyright(C) 2006, NXP Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2006.07.13  ver 1.00    Prelimnary version, first Release
 *
******************************************************************************/
#include "LPC23xx.h"				/* LPC23xx definitions */
#include "type.h"
#include "irq.h"
#include "timer.h"
#include "./inc/fio.h"

#define HSPortDirRegister	    *(volatile unsigned long *)(HS_PORT_DIR_BASE + PortNum * HS_PORT_DIR_INDEX)
#define RegularPortDirRegister	*(volatile unsigned long *)(REGULAR_PORT_DIR_BASE + PortNum * REGULAR_PORT_DIR_INDEX)

/*****************************************************************************
** Function name:		GPIOInit
**
** Descriptions:		initialize GPIO port
**
** parameters:			port number and port type, Fast I/O or 
** 						regular GPIO, direction
** Returned value:		None
** 
*****************************************************************************/

void GPIOInit( DWORD PortNum, DWORD PortType, DWORD portDir, DWORD portSelect )
{
   /* ioSelect used to devine all pins assigned to particular gpio device */

    if ( (PortType == REGULAR_PORT) && ((PortNum == 0) || (PortNum == 1)) )
	{
		SCS &= ~GPIOM;		/* set GPIOx to use regular I/O */

		(RegularPortDirRegister) &= portSelect;
		(RegularPortDirRegister) |= portDir;
	}
	else if ( PortType == FAST_PORT )
	{
		if ( (PortNum == 0) || (PortNum == 1) )
		{
			SCS |= GPIOM;	/* set GPIOx to use Fast I/O */
		}
		(HSPortDirRegister) &=  portSelect; /* clear GPIO direction for device */
		(HSPortDirRegister) |=  portDir;
	}
    return;
}

/*********************************************************************************
**                            End Of File
*********************************************************************************/