main.c

LPC2400ARM开发参考

/****************************************Copyright (c)***************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  
** Last Version:		
** Descriptions:		测试LPC2468_EV(70807_v1.0)板子上的SDRAM--HY57V561620CLT-HI的读写
**
**------------------------------------------------------------------------------------------------------
** Created by:			张铭杰
** Created date:		2007-9-18
** Version:				v1.0
** Descriptions:		The origianl version
**                      往SDRAM写入256个字节数据，然后读出进行校验，如果读写正确则蜂鸣器响一下(或LED等闪
**                      一下)；如果读写不正确，则不断报警(或LED不断闪烁)。需将跳线P3.30和BEEP短接
**------------------------------------------------------------------------------------------------------
** Modified by:			
** Modified date:		
** Version:
** Descriptions:		
**
**------------------------------------------------------------------------------------------------------
** Modified by:			
** Modified date:		
** Version:
** Descriptions:		
**
********************************************************************************************************/

#include "config.h"

#define	 BEEP1  1 << 30					                                /*  P3.30引脚控制蜂鸣器         */
#define  SDRAM_ADDR		0xA0000000  	                                /*  SDRAM起始地址,Bank0         */


/*********************************************************************************************************

* Function name ：    DelayNS
* Descriptions ：     长软件延时
* input parameters ： idly	延时参数，值越大，延时越久
* output parameters ：无
* Returned value ：   无
* Created By ：       
* Created Date ：     2007-9-18
**-------------------------------------------------------------------------------------------------------
* Modified by ： 
* Modified dete ：
*********************************************************************************************************/
void  DelayNS(uint32  idly)
{  
    uint32  i;
    for(; idly>0; idly--){
        for(i=0; i<5000; i++);
    }
}


/*********************************************************************************************************

* Function name ：    SDRAMInit
* Descriptions ：     初始化SDRAM
* input parameters ： 无
* output parameters ：无
* Returned value ：   无
* Created By ：       zhangmingjie
* Created Date ：     2007-9-18
**-------------------------------------------------------------------------------------------------------
* Modified by ： 
* Modified dete ：
*********************************************************************************************************/
void  SDRAMInit( void )
{  
    uint32  i,dummy;
    
    PINSEL6  = 0x55555555;   /* D0--D15 */
    PINSEL8  = 0x15555555;   /* A0--A14 */
    
    PINSEL9 |= 0x00040000;   /* nWE */
    
    PINSEL5  = 0x05010115;   /* nCAS,nRAS,nDYCS0,nCKEOUT0,DQMOUT0,DQMOUT1*/ 
    
    EMCControl = 0x01;             /* 禁止镜像                  */ 
    
    
    EMCDynamictRP   = 1;        /*  tRP  2cclk		*/
	EMCDynamictRAS  = 2;		/*	tRAS 3cclk		*/
	EMCDynamictSREX = 1;		/*	tSREX 3cclk		*/
	EMCDynamictAPR  = 0;		/*	tAPR  1cclk		*/
	EMCDynamictDAL  = 3;		/*	TDAL  4cclk		*/
	EMCDynamictWR   = 2;		/*	tWR  3cclk		*/
	EMCDynamictRC   = 3;		/*	tRC   4cclk		*/
	EMCDynamictRFC  = 3;		/*	tRFC  4cclk		*/
	EMCDynamictXSR  = 1;		/*	tXSR   2cclk	*/
	EMCDynamictRRD  = 0;		/*	tRRD   1cclk	*/
	EMCDynamictMRD  = 2;	    /*	tMRD  3cclk		*/
		

	EMCDynamicReadConfig =1;		/* Command delayed strategy */

  /* Default setting, RAS latency 3 CCLKs, CAS latenty 3 CCLKs. */
    EMCDynamicRASCAS0  = 0x00000303;

  /* 256MB, 16Mx16, 4 banks, row=13, column=9 */
    EMCDynamicConfig0 = 0x00000680;
    DelayNS(2);

  /* Mem clock enable, CLKOUT runs, send command: NOP */
    EMCDynamicControl = 0x00000183;
    DelayNS(2);
    
  /* Send command: PRECHARGE-ALL, shortest possible refresh period */
    EMCDynamicControl = 0x00000103;
    DelayNS(2);

  /* set 32 CCLKs between SDRAM refresh cycles */
    EMCDynamicRefresh  = 0x00000002;
    for(i = 0; i < 0x80; i++);	/* wait 128 AHB clock cycles */
    
  /* set 28 x 16CCLKs=448CCLK=7us between SDRAM refresh cycles */
    EMCDynamicRefresh  = 28;
    
  /* To set mode register in SDRAM, enter mode by issue
  MODE command, after finishing, bailout and back to NORMAL mode. */    
  /* Mem clock enable, CLKOUT runs, send command: MODE */
    EMCDynamicControl = 0x00000083;
    dummy=*((volatile uint32 *)(0xa0033000));
    EMCDynamicControl = 0x00000000;	  /* Send command: NORMAL */
    EMCDynamicConfig0 |= 0x00080000;	  /* Enable buffer */
    DelayNS(2);
}

/********************************************************************************************************
* Function name ：    main
* Descriptions ：     主函数
* input parameters ： 无
* output parameters ：无
* Returned value ：   0
* Created By ：       zhangmingjie
* Created Date ：     2007-9-18
**-------------------------------------------------------------------------------------------------------
* Modified by ： 
* Modified date ：
*********************************************************************************************************/
int  main(void)
{  
    uint32  i;
    uint32  iErr = 0;
   
    volatile uint8  *piAddr;

    PINSEL7 = 0x00000000;			                                    /*  管脚选择GPIO                */   
    FIO3DIR  = BEEP1; 				                                    /*  设置为输出                  */ 
    FIO3SET = BEEP1;	
    			
    SDRAMInit();                                                        /*  初始话SDRAM接口             */ 
    piAddr = (volatile uint8  *)SDRAM_ADDR + 0;
    
    for( i = 0; i < 256; i++ ){
        *piAddr = i; 
        piAddr += 1;
    }
    
    piAddr = (volatile uint8  *)SDRAM_ADDR + 0;

    for( i = 0; i < 256; i++){    
        if( *(piAddr++) != i ){
        iErr = 1;
        break;
        };
        iErr = 0;
    }
    
    if( 0 == iErr ){  
        FIO3CLR = BEEP1;				                                   
        DelayNS(1000);
        FIO3SET = BEEP1;				
        DelayNS(1000);
    }
    else{  
        while(1){  
            FIO3CLR = BEEP1;			
            DelayNS(100);
            FIO3SET = BEEP1;			
            DelayNS(100);
        }
    }  
    
    while(1);
    return(0);
}