NandFlash的规范程序代码

nandflash裸机驱动程序的分析

nandflash在嵌入式设备中广泛的应用，学些nandflash的重要性不言而喻，这里分析一段实例代码，不管是编码规范还是程序的结构都是很有价值的。下边是K9F1208U0M的实例代码。

首先看nand.h文件：

#ifndef __NAND_Flash__

#define __NAND_Flash__

extern void InitNandCfg(void); //初始化K9F1208UOM NAND flash 配置extern unsigned int ReadChipId(void); //读取NAND Flash的ID号extern unsigned short ReadStatus(void); //读取NAND Flash的状态extern unsigned int EraseBlock(unsigned int addr); //NAND Flash块擦除extern void ReadPage(unsigned int addr, unsigned char *buf); //K9F1208U0M nand flash 的页数据读

extern void WritePage(unsigned int addr, unsigned char *buf); //K9F1208U0M nand flash 的页数据写

extern void MarkBadBlk(unsigned int addr); //屏蔽K9F1208U0M nand flash 的坏块

extern int CheckBadBlk(unsigned int addr); //检查K9F1208U0M nand flash 的坏块

extern void InitNandFlash(void); //K9F1208U0M nand flash 的初始化

#endif

需要详细看的是nandflash.c文件：

//==================================================== // 常量定义区

//==================================================== #define EnNandFlash() (rNFCONF |= 0x8000) //bit15=1 enable NAND flash controller

#define DsNandFlash() (rNFCONF &= ~0x8000) //bit15=1 disable NAND flash controller

#define InitEcc() (rNFCONF |= 0x1000) //bit12=1 initialize ECC

#define NoEcc() (rNFCONF &= ~0x1000) //bit12=0 initialize ECC

#define NFChipEn() (rNFCONF &= ~0x800) //bit11=0 NAND flash nFCE = L (active)

#define NFChipDs() (rNFCONF |= 0x800) //bit11=1 NAND flash nFCE = H (inactive)

#define WrNFCmd(cmd) (rNFCMD = (cmd)) //write commond to nand flash

#define WrNFAddr(addr) (rNFADDR = (addr)) //write address to nand flash

#define WrNFDat(dat) (rNFDATA = (dat)) //write data to nand flash

#define RdNFDat() (rNFDATA) //read data from nand flash

#define RdNFStat() (rNFSTAT) //read status from nand flash

#define NFIsBusy() (!(rNFSTAT&1)) //whether nand flash is busy?

#define NFIsReady() (rNFSTAT&1) //whether nand flash is ready?

#define READCMD0 0 //Read0 model command == Page addr 0~127

#define READCMD1 1 //Read1 model command == Page addr 128~511

#define READCMD2 0x50 //Read2 model command == Page addr 512~527

#define ERASECMD0 0x60 //Block erase command 0

#define ERASECMD1 0xd0 //Block erase command 1

#define PROGCMD0 0x80 //page write command 0

#define PROGCMD1 0x10 //page write command 1

#define QUERYCMD 0x70 //query command

#define RdIDCMD 0x90 //read id command

//==================================================== // 函数定义区

//==================================================== #include "NAND_Flash.h"

#include "2410addr.h"

static unsigned short NandAddr;

//等待NAND FLASH不忙

void wait_idle(void)

{

int i;

while(!(rNFSTAT & 0x1)) //如果是忙则一直等待下去.

for(i=0; i<10; i++);

}

/* 在第一次实用NAND Flash前，复位一下NAND Flash */

void reset_nand()

{

int i=0;

rNFCONF &= ~0x800; //激活NANDFlash

for(; i<10; i++);

rNFCMD = 0xff; //看数据手册第9页上的命令.

wait_idle();

}

//==================================================== // 语法格式：void InitNandCfg(void)

// 功能描述: 初始化K9F1208U0M nand flash 配置

// 入口参数: 无

// 出口参数: 无

//====================================================