gpio.c

S3C24A0的完整BSP包,对开发此芯片的开发者很有用.

//
// Copyright (c) Samsung Electronics.  All rights reserved.
//
//------------------------------------------------------------------------------
//
//  File: gpio.c
//
//  This file implement part of GPIO module for SMDK24A0 SoC.
//
#include <windows.h>
#include <ceddk.h>
#include <nkintr.h>
#include <oal.h>
#include <s3c24A0.h>
#include <s3c24a0_ioport.h>
#include <intr.h>


//------------------------------------------------------------------------------
//
//  Globals.

//  The global variables are storing virual address for interrupt and port
//  registers for use in interrupt handling to avoid possible time consumig
//  call to OALPAtoVA function.
//
static S3C24A0_IOPORT_REG *g_pPortRegs;
//------------------------------------------------------------------------------

void OEMInitPort(void)
{
	DWORD rdata;
	
	g_pPortRegs = (S3C24A0_IOPORT_REG*)OALPAtoVA(S3C24A0_BASE_REG_PA_IOPORT, FALSE);
#if 0	
//	DWORD rdata;	
	
    //CAUTION:Follow the configuration order for setting the ports. 
    // 1) setting value(GPDAT) 
    // 2) setting control register  (GPCON_U,GPCON_M, GPCON_L))
    // 3) configure pull-up resistor(GPUP)  

    //Ports  :GP31 GP30 GP29 GP28 GP27 GP26 GP25 GP24 PG23 GP22 GP21 GP20 GP19	
    //GPDAT  :0    0    0    0    0    0    0    0    0    0    0    0    0
    //GPCON_U:i    i    i    i    i    i    i    i    i    i    i    i    i
    //GPPU   :x    o    o    x    x    x    x    x    x    x    x    x    x 
 	g_pPortRegs->GPCON_U = 0x3fbffff; 
    //-----------------------------------------------------------------------
    //Ports  :GP18 GP17 GP16 GP15 GP14 GP13 GP12 GP11
    //GPDAT  :0    0    0    0    0    0    0    0   
    //GPCON_M:i    i    i    i    i    i    i    i   
    //GPPU   :x    o    o    o    x    o    x    x   
	g_pPortRegs->GPCON_M = 0xd5aa;
    //-----------------------------------------------------------------------
    //Ports  :GP10 GP9  GP8  GP7  GP6  GP5  GP4  GP3  GP2  GP1  GP0
    //GPDAT  :0    0    0    0    0    0    0    0    0    0    0   
    //GPCON_L:i    i    i    O    O    O    O    i    i    i    i
    //GPPU   :o    x    o    x    x    x    x    o    o    x    x       
	g_pPortRegs->GPCON_L = 0x255545;

	//disable pull-up function
	g_pPortRegs->GPPU = 0xffffffff;

	g_pPortRegs->GPCON_U &= ~((3 << 24)|(3 << 22));	// Configure GP31 and GP30 for UART1 Tx and Rx, respectively.
	g_pPortRegs->GPCON_U |=  ((2 << 24)|(2 << 22));	//

	g_pPortRegs->GPCON_U &= ~((3 << 20)|(3 << 18));	// Configure GP29 and GP28 for UART1 Tx and Rx, respectively.
	g_pPortRegs->GPCON_U |=  ((2 << 20)|(2 << 18));	//


	g_pPortRegs->GPPU  |=   (1 << 31)|(1 << 30);		// Disable pull-up on TXD1 and RXD1.	

    //External interrupt will be falling edge triggered.
	g_pPortRegs->EXTINTC0= 0x222;			//EINT2~0
	g_pPortRegs->EXTINTC1 = 0x22222222;		//EINT10~3
	g_pPortRegs->EXTINTC2 = 0x22222222;		//EINT18~11, falling edge & disabling filter

#endif
	// Ethernet gpio enable
	rdata  = g_pPortRegs->GPCON_M;
	rdata &= ~(3 << 4);
	rdata |=  (2 << 4);
	g_pPortRegs->GPCON_M = rdata;			/* External Interrupt #13 Enable			*/

	rdata  = g_pPortRegs->EXTINTC2;
	rdata &= ~(7 << 8);
	rdata |=  (4 << 8);
	g_pPortRegs->EXTINTC2 = rdata;			/* Rising Edge Detect Mode				*/
}