norflash.c

LPC2468实现norflash驱动

/*****************************************************************************
 *   ex_norflash.c:  External FLASH memory module file for NXP LPC23xx/24xx 
 *	 Family Microprocessors
 *
 *   Copyright(C) 2006, NXP Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2007.01.13  ver 1.00    Prelimnary version, first Release
 *
******************************************************************************/
#include "LPC24xx.h"				/* LPC23xx/24xx definitions */
#include "type.h"
#include "irq.h"
#include "target.h"
#include "timer.h"
#include "norflash.h"

/*****************************************************************************
** Function name:		delay
**
** Descriptions:		延时
**
** parameters:			delayCnt 			 
** 						
** Returned value:		None
** 
*****************************************************************************/
void delay(DWORD delayCnt)
{
  DWORD i;

  for ( i = 0; i < delayCnt; i++ );
  return;
}

/*****************************************************************************
** Function name:		NORFLASHInit
**
** Descriptions:		初始化外部NOR FLASH存储器
**
** parameters:			None			 
** 						
** Returned value:		None
** 
*****************************************************************************/
void NORFLASHInit( void )
{
  /**************************************************************************
   * 为NOR FLASH初始化EMC
  **************************************************************************/
  EMC_CTRL = 0x00000001;

  PCONP   |= 0x00000800;		/* 打开 EMC PCLK */
  PINSEL4 |= 0x50000000;
  PINSEL5 |= 0x05050555;
  PINSEL6 |= 0x55555555;
  PINSEL8 |= 0x55555555;
  PINSEL9 |= 0x50555555;

  delayMs(1, 100);		/* 利用定时器Timer 1 */
/*  EMC_STA_CFG0      = 0x00000081;
  EMC_STA_WAITWEN0  = 0x2;
  EMC_STA_WAITOEN0  = 0x2;
  EMC_STA_WAITRD0   = 0x1f;
  EMC_STA_WAITPAGE0 = 0x1f;
  EMC_STA_WAITWR0   = 0x1f;
  EMC_STA_WAITTURN0 = 0xf;
*/
  EMC_STA_CFG0      = 0x00000081;
  EMC_STA_WAITWEN0  = 0x1;
  EMC_STA_WAITOEN0  = 0x1;
  EMC_STA_WAITRD0   = 0x1f;
  EMC_STA_WAITPAGE0 = 0x1f;
  EMC_STA_WAITWR0   = 0x1f;
  EMC_STA_WAITTURN0 = 0xf;

  delayMs(1, 10);			/* 利用定时器Timer 1 */
  return;
}

/*****************************************************************************
** Function name:		ToggleBitCheck
**
** Descriptions:		如果数据有写过着擦出则触发改位检测
**
** parameters:			Address and Expected data			 
** 						
** Returned value:		done(TRUE) or timeout(FALSE)
** 
*****************************************************************************/
DWORD ToggleBitCheck( DWORD Addr, WORD Data )
{
  volatile WORD *ip;
  WORD temp1, temp2;
  DWORD TimeOut = PROGRAM_TIMEOUT;

  while( TimeOut > 0 )
  {
	ip = GET_ADDR(Addr);
	temp1 = *ip;
	ip = GET_ADDR(Addr);
	temp2 = *ip;

	if ( (temp1 == temp2) && (temp1 == Data) )
	{
	  return( TRUE );
	}
	TimeOut--;
  }
  return ( FALSE );
}

/*****************************************************************************
** Function name:		NORFLASHCheckID
**
** Descriptions:		检查外部NOR FLASH存储器的ID号
** 						具体参考相应NOR FLASH的数据手册
**
** parameters:			None			 
** 						
** Returned value:		Flash ID 读取不正确 False
** 
*****************************************************************************/
DWORD NORFLASHCheckID( void )
{
  volatile WORD *ip;
  WORD SST_id1, SST_id2;

  /* 确认对应AM29LV160的产品ID号 */	  
  //autoselect mode (word)
  ip  = GET_ADDR(0x5555);	 //为什么是四个5？？？？？？？？？？？？？
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2AAA);
  *ip = 0x0055;
  ip  = GET_ADDR(0x5555);
  *ip = 0x0090;
  delay(10);

//  ip=GET_ADDR(0x555);
//  *ip=0x00AA;
//  ip=GET_ADDR(0x2AA);
//  *ip=0x0055;
//  ip=GET_ADDR(0x555);
//  *ip=0x0090;
//  delay(10);

  /* Read the product ID from 39VF160 */
  /* 从AM29LV160读取产品ID号 */
  ip  = GET_ADDR(0x0000); 	   //the fouth cycle is a read cycle
  SST_id1 = *ip & 0x00FF;
  ip  = GET_ADDR(0x0001);
  SST_id2 = *ip;             

  /* 确认AM29LV160的产品ID号，以便退出本函数 */
  /* 进入读操作模式 */
/*  ip  = GET_ADDR(0x5555);
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2AAA);
  *ip = 0x0055;
  ip  = GET_ADDR(0x5555);
*/  
  *ip = 0x00F0;    
  delay(10);

  /* 校验 ID */
  if ((SST_id1 == MANUFACTURER_ID) && (SST_id2 ==DEVICE_ID))
	return( TRUE );
  else
	return( FALSE );
}

/*****************************************************************************
** Function name:		NORFLASHErase
**
** Descriptions:		擦出外部NOR FLASH存储器
**
** parameters:			None			 
** 						
** Returned value:		None
** 
*****************************************************************************/
void NORFLASHErase( void ) 
{
  volatile WORD *ip;

  ip  = GET_ADDR(0x555);
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2AA);
  *ip = 0x0055;
  ip  = GET_ADDR(0x555);
  *ip = 0x0080;
  ip  = GET_ADDR(0x555);
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2AA);
  *ip = 0x0055;
  ip  = GET_ADDR(0x555);
  *ip = 0x0010;
  delayMs(1, 30000);				/* 利用定时器Timer 1 */
  return;

}
void NORFLASHSectorErase(BYTE sector)
{
volatile WORD *ip;

  if(sector >SECTOR_NUM_AMD) return ;
  ip  = GET_ADDR(0x555);
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2AA);
  *ip = 0x0055;
  ip  = GET_ADDR(0x555);
  *ip = 0x0080;
  ip  = GET_ADDR(0x555);
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2AA);
  *ip = 0x0055;
  ip  = GET_ADDR(sector);
  *ip = 0x0030;
  delayMs(1, 2000);				/* 利用定时器Timer 1 */
  return;
}
/*****************************************************************************
** Function name:		NORFLASHWriteWord
**
** Descriptions:		将一个16bit的数据写入外部NOR FLASH存储器						
**
** parameters:			DWORD address , WORD data			 
** 						
** Returned value:		写操作成功TRUE，失败FALSE
** 
*****************************************************************************/
DWORD NORFLASHWriteWord( DWORD Addr, WORD Data ) 
{
  volatile WORD *ip;
/*
  ip  = GET_ADDR(0x5555);
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2aaa);
  *ip = 0x0055;
  ip  = GET_ADDR(0x5555);
  *ip = 0x00A0;
  */   

  ip  = GET_ADDR(0x555); //时序复用
  *ip = 0x00AA;
  ip  = GET_ADDR(0x2aa);
  *ip = 0x0055;
  ip  = GET_ADDR(0x555);
  *ip = 0x00A0;

  ip = GET_ADDR(Addr);		/* 按照16bit字方式写 */
  *ip = Data;
  return ( ToggleBitCheck( Addr, Data ) );
}


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