s3c2440對K9F2G08UOB Nand Flash的簡單操作函數

功能：先擦除一塊nand flash地址，然后往里面寫一字符串，最后再讀出來

實現，擦除、寫、讀功能。 芯片型號：K9F2G08UOB

/****************************************************
擦除nand flash 0x500000 地址
主函數：erase.c
****************************************************/
#define NFCONF *(volatile unsigned long *)0x4E000000
#define NFCONT *(volatile unsigned long *)0x4E000004
#define NFCMMD *(volatile unsigned long *)0x4E000008
#define NFADDR *(volatile unsigned long *)0x4E00000C
#define NFDATA *(volatile unsigned char *)0x4E000010
#define NFSTAT *(volatile unsigned long *)0x4E000020

void (*printf)(char *, ...) = 0x33f9291C;
void erase_nand(unsigned long addr);

void _start(void)
{
//configure for nand flash controller
NFCONF = (0x2 << 12) | (0x7 << 8) | (0x1 << 4);

//control
//NAND flash 開始工作
NFCONT = 1;

//設置擦除地址
erase_nand(0x500000);

}

//------發送地址參照K9F2G08UOA數據手冊第9頁--------
void send_addr(unsigned long addr)
{
NFADDR = (addr >> 11) & 0xff;
NFADDR = (addr >> 19) & 0xff;
NFADDR = (addr >> 27) & 0x1;
}

/*****************************************
塊擦除
對照K9F2G08UOA手冊第28頁
******************************************/
void erase_nand(unsigned long addr)
{
unsigned int stat;

//發送指令60h塊擦除設置指令
NFCMMD = 0x60;

//發送三次行地址
send_addr(addr);

//nandflash ready
//發送d0擦除指令
NFCMMD = 0xd0;

//等待忙狀態
while(!(NFSTAT & 0x1))
;


// 發送70h讀狀態指令
NFCMMD = 0x70;

//讀取數據
stat = NFDATA;

//最后一位判斷成功與否
if(stat & 0x1){
printf("erase nand flash device errn");
return ;
}

printf("erase nand flash device successn");
}

/****************************************************
寫nand flash 0x500000 地址 一個字符串
主函數：write.c
****************************************************/
#define NFCONF *(volatile unsigned long *)0x4E000000
#define NFCONT *(volatile unsigned long *)0x4E000004
#define NFCMMD *(volatile unsigned long *)0x4E000008
#define NFADDR *(volatile unsigned long *)0x4E00000C
#define NFDATA *(volatile unsigned char *)0x4E000010
#define NFSTAT *(volatile unsigned long *)0x4E000020


void (*printf)(char *, ...) = 0x33f9291C;
void write_nand(char *buf, unsigned long addr, int size);
char buf[11];

void _start(void)
{
int i;

//configure for nand flash controller
NFCONF = (0x2 << 12) | (0x7 << 8) | (0x1 << 4);

//control
NFCONT = 1;

//準備一個全寫a的數組
for(i = 0; i < 11; i++)
{
buf= a;
}

//往0x500000寫字符串buf 11個字節
write_nand(buf, 0x500000, 11);

}

//------發送地址參照K9F2G08UOA數據手冊第9頁--------
void send_addr(unsigned long addr)
{
NFADDR = addr & 0xff;
NFADDR = (addr >> 8) & 0x7;
NFADDR = (addr >> 11) & 0xff;
NFADDR = (addr >> 19) & 0xff;
NFADDR = (addr >> 27) & 0x1;
}

/*****************************************
寫數據
對照K9F2G08UOA手冊第25頁
******************************************/
void write_nand(char *buf, unsigned long addr, int size)
{
int i;
unsigned int stat;

//發80h串口數據輸入指令
NFCMMD = 0x80;

//發送兩次列地址，三次行地址
send_addr(addr);

//nandflash 數據準備
for(i = 0; i < (size); i++)
{
NFDATA = buf;
}

//發送10h寫指令
NFCMMD = 0x10;

//等待忙狀態
while(!(NFSTAT & 0x1))
;

// 發送70h讀狀態指令
NFCMMD = 0x70;
stat = NFDATA;

//最后一位判斷成功與否
if(stat & 0x1){
printf("write nand flash device errn");
return ;
}
printf("write nand flash device successn");
}

/****************************************************
讀nand flash 0x500000 地址 10個字節
主函數：read.c
****************************************************/

#define NFCONF *(volatile unsigned long *)0x4E000000
#define NFCONT *(volatile unsigned long *)0x4E000004
#define NFCMMD *(volatile unsigned long *)0x4E000008
#define NFADDR *(volatile unsigned long *)0x4E00000C
#define NFDATA *(volatile unsigned char *)0x4E000010
#define NFSTAT *(volatile unsigned long *)0x4E000020


void (*printf)(char *, ...) = 0x33f9291C;
void read_nand(char *buf, unsigned long addr, int size);

void _start(void)
{
char buf[11];


//configure for nand flash controller
NFCONF = (0x2 << 12) | (0x7 << 8) | (0x1 << 4);

//control
NFCONT = 1;

//往0x500000讀數據
read_nand(buf, 0x500000, 10);
buf[11] = 0;

printf("read from nandflash: %sn", buf);
}

//------發送地址參照K9F2G08UOA數據手冊第9頁--------
void send_addr(unsigned long addr)
{
NFADDR = addr & 0xff;
NFADDR = (addr >> 8) & 0x7;
NFADDR = (addr >> 11) & 0xff;
NFADDR = (addr >> 19) & 0xff;
NFADDR = (addr >> 27) & 0x1;
}

/*****************************************
讀數據
對照K9F2G08UOA手冊第23頁
******************************************/
void read_nand(char *buf, unsigned long addr, int size)
{
int i;

NFCMMD = 0x00;

send_addr(addr);

NFCMMD = 0x30;

while(!(NFSTAT & 0x1 ))
;

//nandflash ready
for(i = 0; i < (size); i++)
{
buf= NFDATA;
}

}