nand flash简单操作---基于arm9 s3c2440

功能：先擦除一块nand flash地址，然后往里面写一字符串，最后再读出来

实现，擦除、写、读功能。 芯片型号：K9F2G08UOB

/****************************************************
擦除nand flash 0x500000 地址
主函数：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 开始工作
NFCONT = 1;

//设置擦除地址
erase_nand(0x500000);

}

//------发送地址参照K9F2G08UOA数据手册第9页--------
void send_addr(unsigned long addr)
{
NFADDR = (addr >> 11) & 0xff;
NFADDR = (addr >> 19) & 0xff;
NFADDR = (addr >> 27) & 0x1;
}

/*****************************************
块擦除
对照K9F2G08UOA手册第28页
******************************************/
void erase_nand(unsigned long addr)
{
unsigned int stat;

//发送指令60h块擦除设置指令
NFCMMD = 0x60;

//发送三次行地址
send_addr(addr);

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

//等待忙状态
while(!(NFSTAT & 0x1))
;


// 发送70h读状态指令
NFCMMD = 0x70;

//读取数据
stat = NFDATA;

//最后一位判断成功与否
if(stat & 0x1){
printf("erase nand flash device err\n");
return ;
}

printf("erase nand flash device success\n");
}

/****************************************************
写nand flash 0x500000 地址 一个字符串
主函数：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;

//准备一个全写a的数组
for(i = 0; i < 11; i++)
{
buf[i] = 'a';
}

//往0x500000写字符串buf 11个字节
write_nand(buf, 0x500000, 11);

}

//------发送地址参照K9F2G08UOA数据手册第9页--------
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;
}

/*****************************************
写数据
对照K9F2G08UOA手册第25页
******************************************/
void write_nand(char *buf, unsigned long addr, int size)
{
int i;
unsigned int stat;

//发80h串口数据输入指令
NFCMMD = 0x80;

//发送两次列地址，三次行地址
send_addr(addr);

//nandflash 数据准备
for(i = 0; i < (size); i++)
{
NFDATA = buf[i];
}

//发送10h写指令
NFCMMD = 0x10;

//等待忙状态
while(!(NFSTAT & 0x1))
;

// 发送70h读状态指令
NFCMMD = 0x70;
stat = NFDATA;

//最后一位判断成功与否
if(stat & 0x1){
printf("write nand flash device err\n");
return ;
}
printf("write nand flash device success\n");
}

/****************************************************
读nand flash 0x500000 地址 10个字节
主函数：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读数据
read_nand(buf, 0x500000, 10);
buf[11] = 0;

printf("read from nandflash: %s\n", buf);
}

//------发送地址参照K9F2G08UOA数据手册第9页--------
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;
}

/*****************************************
读数据
对照K9F2G08UOA手册第23页
******************************************/
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[i] = NFDATA;
}

}

实验效果：

[HAPPY_LEE]# tftp 30000000 erase.bin //加载擦除函数

[HAPPY_LEE]# tftp 31000000 write.bin //加载写函数

[HAPPY_LEE]# tftp 32000000 read.bin //加载读函数

[HAPPY_LEE]# go 30000000
## Starting application at 0x30000000 ...
erase nand flash device success //擦除成功
## Application terminated, rc = 0x0

[HAPPY_LEE]# go 31000000
## Starting application at 0x31000000 ...
write nand flash device success //写成功
## Application terminated, rc = 0x0

[HAPPY_LEE]# go 32000000
## Starting application at 0x32000000 ...
read from nandflash: aaaaaaaaaa3 //读数据
## Application terminated, rc = 0x0