memory.c

来自「本程序为DM642的存储空间查看程序」· C语言 代码 · 共 55 行

/* ======================================================================== */
/*  Copyright 2006 by Wintech Digital System Technology Corp.               */
/*  All rights reserved. Property of Texas Instruments Incorporated.        */
/*  Restricted rights to use, duplicate or disclose this code are           */
/*  granted through contract.	                                            */														
/* ======================================================================== */

#include "stdio.h"

#define EMIF_GCTL       0x01800000
#define EMIF_CE1        0x01800004
#define EMIF_CE0        0x01800008
#define EMIF_CE2        0x01800010
#define EMIF_CE3        0x01800014
#define EMIF_SDRAMCTL   0x01800018
#define EMIF_SDRAMTIM   0x0180001C
#define EMIF_SDRAMEXT   0x01800020
#define EMIF_CCFG       0x01840000;

#define SDRAM_BASE_ADDRESS    0x80000000
#define SDRAM_SIZE      0x2000000

void init_emif();

main()
{
    int i;
    
    init_emif();
    
    for(i = 0;i < 32; i++)
    {
       *(int *)(SDRAM_BASE_ADDRESS+i*4) = i;
    }
   	puts("SDRAM Test is OK!\n") ;
   	
   	exit(0);
}

  /*----------初始化EMIF---------------*/
void init_emif( )
{
	*(int *)EMIF_GCTL     = 0x00052078;
	*(int *)EMIF_CE0      = 0xffffffd3;  // SDRAM:64位位宽
	*(int *)EMIF_CE1      = 0xffffff93;  
	*(int *)EMIF_SDRAMCTL = 0x57115000 ; // SDRAM control          
	*(int *)EMIF_SDRAMTIM = 0x0000081b;  // SDRAM timing (refresh)   
	*(int *)EMIF_SDRAMEXT = 0x001faf4d;  // SDRAM Extension register 
}

/* ======================================================================== */
/*             Copyright (c) 2006 Wintech Digital System Technology Corp.   */
/*                         All Rights Reserved.                             */
/* ======================================================================== */