fio.c

来自「arm lpc2300 GPIO设计 实现lpc2300通用IO口的数据传输」· C语言 代码 · 共 66 行

/*****************************************************************************
 *   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 "fio.h"

/*****************************************************************************
** 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 )
{
  if ( (PortType == REGULAR_PORT) && ((PortNum == 0) || (PortNum == 1)) )
  {
	SCS &= ~GPIOM;		/* set GPIOx to use regular I/O */
	if ( PortDir == DIR_OUT )
	{
	  (*(volatile unsigned long *)(REGULAR_PORT_DIR_BASE 
			+ PortNum * REGULAR_PORT_DIR_INDEX)) = 0xFFFFFFFF;
	}
	else
	{
	  (*(volatile unsigned long *)(REGULAR_PORT_DIR_BASE 
			+ PortNum * REGULAR_PORT_DIR_INDEX)) = 0x00000000;
	}
  }
  else if ( PortType == FAST_PORT )
  {
	if ( (PortNum == 0) || (PortNum == 1) )
	{
	  SCS |= GPIOM;	/* set GPIOx to use Fast I/O */
	}
	if ( PortDir == DIR_OUT )
	{
	  (*(volatile unsigned long *)(HS_PORT_DIR_BASE 
			+ PortNum * HS_PORT_DIR_INDEX)) = 0xFFFFFFFF;
	}
	else
	{
	  (*(volatile unsigned long *)(HS_PORT_DIR_BASE 
			+ PortNum * HS_PORT_DIR_INDEX)) = 0x00000000;
    }
  }
  return;
}

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