/****************************************************************
 *		  ARMSYS S3C44B0X  NandFLASH lib						*  
 ****************************************************************
 
  1.2005.5.16::  NandFLASH lib 
 
 ***************************************************************/
 

#include "..\target\44b.h"
#include "..\target\44blib.h"
#include "..\nandflash\nandFlib.h"

#define LANANDBLOCK  1023


void NAND_CMD(void)
{
   rPDATC =(rPDATC&0xf1)|(Nand_CLE&(~(Nand_CE|Nand_ALE)));
// CLE為高、CE和ALE為低
}
void NAND_ADR(void)
{
   rPDATC =(rPDATC&0xf1)|(Nand_ALE&(~(Nand_CE|Nand_CLE)));
// ALE為高、CE和CLE為低
}
void NAND_DAT(void)
{
   rPDATC =(rPDATC&0xf1)|( ~(Nand_CE|Nand_CLE| Nand_ALE));
// ALE、CE和CLE全為低
}
void NAND_INVALID(void)
{
   rPDATC =(rPDATC&0xf1)|( Nand_CE&(~(Nand_CLE|Nand_ALE)));
// CE為高、ALE和CLE為低
}
void WAIT_RB(void)
{
   while(!(rPDATC & Nand_RB));
}

unsigned int Check_Flash_Id(void)
{
	int i;
	unsigned int id;

	NAND_CMD();
	Nand_IO = 0x90;

	NAND_ADR();
	Nand_IO = 0;

	NAND_DAT();
	for(i=0;i<10;i++);	
	id = Nand_IO<<8;//連續讀出兩個字節
	id += Nand_IO;
	NAND_INVALID();
	return id;
}


void Flash_Reset()		
{ 
	int i;
	//  rPDATC = rPDATC | WP;	
	NAND_CMD();
	Nand_IO = 0xff;	
	for (i=0;i<3000;i++);	 	
}
/********************************************************/
/*功能：擦除FLASH的1Block(對應文件系統為1CluNANDer)          */
/********************************************************/
unsigned char Erase_Cluster(unsigned int block) 
{
	unsigned int blockPage = (block<<5);
	int i;

	NAND_CMD();
	Nand_IO = 0x60;

	NAND_ADR();	     
	Nand_IO = blockPage & 0xff;  
	Nand_IO = (blockPage>>8) & 0xff;

	for(i=0;i<2;i++);		
    
	NAND_CMD();
	Nand_IO = 0xd0;
    
	for(i=0;i<3;i++);
    
	NAND_DAT();
	WAIT_RB();					

	NAND_CMD();
	Nand_IO = 0x70;
	NAND_DAT();
	if (Nand_IO & 0x1) 
	{
		NAND_INVALID();
		return FAIL;
	}
	else 
	{
		NAND_INVALID();   
		return OK;
	}
}

/*****************************************************************/
/*功能：讀取FLASH的某個Block中的1page數據                           */
/*****************************************************************/
void ReadPage(unsigned int block,unsigned int page,unsigned char *buffer)
{
	int i;
	unsigned int blockPage = (block<<5) + page;

	NAND_CMD();               
	Nand_IO = 0x00;
	NAND_ADR();
	Nand_IO = 0;
	Nand_IO = blockPage & 0xff;
	Nand_IO = (blockPage>>8) & 0xff;
	for(i=0;i<3;i++);
	NAND_DAT();
	WAIT_RB();	
	for(i=0;i<528;i++)
	{
	    *buffer++=Nand_IO;
	}   
	//ReadPage(buffer);		
	NAND_INVALID();
}
/*****************************************************************/
/*功能：向FLASH的某個Block中的1page寫入數據                         */
/*輸出：0:Fail;1:OK                                               */
/*****************************************************************/
int WritePage(unsigned int block,unsigned int page,unsigned char *buffer)  
{
	unsigned int blockPage = (block<<5) + page;
	int i;
	unsigned char *Source;                                      
	Source=buffer;
	NAND_CMD();
	Nand_IO = 0x80;
	NAND_ADR();
	Nand_IO = 0;
	Nand_IO = blockPage & 0xff;
	Nand_IO = (blockPage>>8) & 0xff;
	NAND_DAT();
	for(i=0;i<528;i++)
	{
	    Nand_IO=*buffer++;
	}        
	//WritePage(buffer); 

	NAND_CMD();
	Nand_IO = 0x10;
	for(i=0;i<10;i++);    
                        
	WAIT_RB();	
	Nand_IO = 0x70;
	NAND_DAT();
	for(i=0;i<3;i++);  
	if((Nand_IO & 0x1))	
	{
		NAND_INVALID();	
		return 0;
	}
	else
	{
		NAND_INVALID();
		return 1;	    
	}
}