JZ2440 NAND FLASH学习
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具体步骤：
从硬件上，访问NAND FLASH
1. 发命令（CLE）
2.发送地址（ALE）
3.传输数据
2440：
1.NFCMD
2.NFADDR
3.NFDATA
4.状态NFSTAT
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程序运行步骤：
第一步、上电，把NAND FLASH的4K的内容，自动复制到片内SRAM中（CPU的缓存中），设置栈指针sp 4096（C语言需要使用栈）关掉看门狗；
第二步、初始化SDRAM、初始化NAND FLASH ；
第三步、将NAND FLASH 4096开始的1M字节（mian.c）复制到SDRAM中；
第四步、重新设置栈指针pc 0x3400 0000(SDRAM),并跳到SDRAM中执行main函数
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代码如下：
1.head.s
@******************************************************************************@ File：head.s@ 功能：设置SDRAM，将程序复制到SDRAM，然后跳到SDRAM继续执行@****************************************************************************** .text.global _start_start: @函数disable_watch_dog, memsetup, init_nand, nand_read_ll在init.c中定义 ldr sp, =4096 @设置堆栈 bl disable_watch_dog @关WATCH DOG bl memsetup @初始化SDRAM bl nand_init @初始化NAND Flash @将NAND Flash中地址4096开始的1024字节代码(main.c编译得到)复制到SDRAM中 @nand_read_ll函数需要3个参数： ldr r0, =0x30000000 @1. 目标地址=0x30000000，这是SDRAM的起始地址 mov r1, #4096 @2. 源地址 = 4096，连接的时候，main.c中的代码都存在NAND Flash地址4096开始处 mov r2, #2048 @3. 复制长度= 2048(bytes)，对于本实验的main.c，这是足够了 bl nand_read @调用C函数nand_read ldr sp, =0x34000000 @设置栈 ldr lr, =halt_loop @设置返回地址 ldr pc, =main @b指令和bl指令只能前后跳转32M的范围，所以这里使用向pc赋值的方法进行跳转halt_loop: b halt_loop
2.init.c
/* WOTCH DOG register */#define WTCON(*(volatile unsigned long *)0x53000000)/* SDRAM regisers */#define MEM_CTL_BASE0x48000000 void disable_watch_dog();void memsetup();/*上电后，WATCH DOG默认是开着的，要把它关掉 */void disable_watch_dog(){WTCON= 0;}/* 设置控制SDRAM的13个寄存器 */void memsetup(){int i = 0;unsigned long *p = (unsigned long *)MEM_CTL_BASE; /* SDRAM 13个寄存器的值 */ unsigned long const mem_cfg_val[]={ 0x22011110, //BWSCON 0x00000700, //BANKCON0 0x00000700, //BANKCON1 0x00000700, //BANKCON2 0x00000700, //BANKCON3 0x00000700, //BANKCON4 0x00000700, //BANKCON5 0x00018005, //BANKCON6 0x00018005, //BANKCON7 0x008C07A3, //REFRESH 0x000000B1, //BANKSIZE 0x00000030, //MRSRB6 0x00000030, //MRSRB7 };for(; i < 13; i++)p[i] = mem_cfg_val[i];}3.nand.c //nand init
#define LARGER_NAND_PAGE#define GSTATUS1 (*(volatile unsigned int *)0x560000B0)#define BUSY 1#define NAND_SECTOR_SIZE 512#define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1)#define NAND_SECTOR_SIZE_LP 2048#define NAND_BLOCK_MASK_LP (NAND_SECTOR_SIZE_LP - 1)typedef unsigned int S3C24X0_REG32;/* NAND FLASH (see S3C2410 manual chapter 6) */typedef struct { S3C24X0_REG32 NFCONF; S3C24X0_REG32 NFCMD; S3C24X0_REG32 NFADDR; S3C24X0_REG32 NFDATA; S3C24X0_REG32 NFSTAT; S3C24X0_REG32 NFECC;} S3C2410_NAND;/* NAND FLASH (see S3C2440 manual chapter 6, www.100ask.net) */typedef struct { S3C24X0_REG32 NFCONF; S3C24X0_REG32 NFCONT; S3C24X0_REG32 NFCMD; S3C24X0_REG32 NFADDR; S3C24X0_REG32 NFDATA; S3C24X0_REG32 NFMECCD0; S3C24X0_REG32 NFMECCD1; S3C24X0_REG32 NFSECCD; S3C24X0_REG32 NFSTAT; S3C24X0_REG32 NFESTAT0; S3C24X0_REG32 NFESTAT1; S3C24X0_REG32 NFMECC0; S3C24X0_REG32 NFMECC1; S3C24X0_REG32 NFSECC; S3C24X0_REG32 NFSBLK; S3C24X0_REG32 NFEBLK;} S3C2440_NAND;typedef struct { void (*nand_reset)(void); void (*wait_idle)(void); void (*nand_select_chip)(void); void (*nand_deselect_chip)(void); void (*write_cmd)(int cmd); void (*write_addr)(unsigned int addr); unsigned char (*read_data)(void);}t_nand_chip;static S3C2410_NAND * s3c2410nand = (S3C2410_NAND *)0x4e000000;static S3C2440_NAND * s3c2440nand = (S3C2440_NAND *)0x4e000000;static t_nand_chip nand_chip;/* 供外部调用的函数 */void nand_init(void);void nand_read(unsigned char *buf, unsigned long start_addr, int size);/* NAND Flash操作的总入口, 它们将调用S3C2410或S3C2440的相应函数 */static void nand_reset(void);static void wait_idle(void);static void nand_select_chip(void);static void nand_deselect_chip(void);static void write_cmd(int cmd);static void write_addr(unsigned int addr);static unsigned char read_data(void);/* S3C2410的NAND Flash处理函数 */static void s3c2410_nand_reset(void);static void s3c2410_wait_idle(void);static void s3c2410_nand_select_chip(void);static void s3c2410_nand_deselect_chip(void);static void s3c2410_write_cmd(int cmd);static void s3c2410_write_addr(unsigned int addr);static unsigned char s3c2410_read_data();/* S3C2440的NAND Flash处理函数 */static void s3c2440_nand_reset(void);static void s3c2440_wait_idle(void);static void s3c2440_nand_select_chip(void);static void s3c2440_nand_deselect_chip(void);static void s3c2440_write_cmd(int cmd);static void s3c2440_write_addr(unsigned int addr);static unsigned char s3c2440_read_data(void);/* S3C2410的NAND Flash操作函数 *//* 复位 */static void s3c2410_nand_reset(void){ s3c2410_nand_select_chip(); s3c2410_write_cmd(0xff); // 复位命令 s3c2410_wait_idle(); s3c2410_nand_deselect_chip();}/* 等待NAND Flash就绪 */static void s3c2410_wait_idle(void){ int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFSTAT; while(!(*p & BUSY)) for(i=0; i<10; i++);}/* 发出片选信号 */static void s3c2410_nand_select_chip(void){ int i; s3c2410nand->NFCONF &= ~(1<<11); for(i=0; i<10; i++); }/* 取消片选信号 */static void s3c2410_nand_deselect_chip(void){ s3c2410nand->NFCONF |= (1<<11);}/* 发出命令 */static void s3c2410_write_cmd(int cmd){ volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFCMD; *p = cmd;}/* 发出地址 */static void s3c2410_write_addr(unsigned int addr){ int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFADDR; *p = addr & 0xff; for(i=0; i<10; i++); *p = (addr >> 9) & 0xff; for(i=0; i<10; i++); *p = (addr >> 17) & 0xff; for(i=0; i<10; i++); *p = (addr >> 25) & 0xff; for(i=0; i<10; i++);}/* 读取数据 */static unsigned char s3c2410_read_data(void){ volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFDATA; return *p;}/* S3C2440的NAND Flash操作函数 *//* 复位 */static void s3c2440_nand_reset(void){ s3c2440_nand_select_chip(); s3c2440_write_cmd(0xff); // 复位命令 s3c2440_wait_idle(); s3c2440_nand_deselect_chip();}/* 等待NAND Flash就绪 */static void s3c2440_wait_idle(void){ int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFSTAT; while(!(*p & BUSY)) for(i=0; i<10; i++);}/* 发出片选信号 */static void s3c2440_nand_select_chip(void){ int i; s3c2440nand->NFCONT &= ~(1<<1); for(i=0; i<10; i++); }/* 取消片选信号 */static void s3c2440_nand_deselect_chip(void){ s3c2440nand->NFCONT |= (1<<1);}/* 发出命令 */static void s3c2440_write_cmd(int cmd){ volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFCMD; *p = cmd;}/* 发出地址 */static void s3c2440_write_addr(unsigned int addr){ int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFADDR; *p = addr & 0xff; for(i=0; i<10; i++); *p = (addr >> 9) & 0xff; for(i=0; i<10; i++); *p = (addr >> 17) & 0xff; for(i=0; i<10; i++); *p = (addr >> 25) & 0xff; for(i=0; i<10; i++);}static void s3c2440_write_addr_lp(unsigned int addr){int i;volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFADDR;int col, page;col = addr & NAND_BLOCK_MASK_LP;page = addr / NAND_SECTOR_SIZE_LP;*p = col & 0xff;/* Column Address A0~A7 */for(i=0; i<10; i++);*p = (col >> 8) & 0x0f; /* Column Address A8~A11 */for(i=0; i<10; i++);*p = page & 0xff;/* Row Address A12~A19 */for(i=0; i<10; i++);*p = (page >> 8) & 0xff;/* Row Address A20~A27 */for(i=0; i<10; i++);*p = (page >> 16) & 0x03;/* Row Address A28~A29 */for(i=0; i<10; i++);}/* 读取数据 */static unsigned char s3c2440_read_data(void){ volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFDATA; return *p;}/* 在第一次使用NAND Flash前，复位一下NAND Flash */static void nand_reset(void){ nand_chip.nand_reset();}static void wait_idle(void){ nand_chip.wait_idle();}static void nand_select_chip(void){ int i; nand_chip.nand_select_chip(); for(i=0; i<10; i++);}static void nand_deselect_chip(void){ nand_chip.nand_deselect_chip();}static void write_cmd(int cmd){ nand_chip.write_cmd(cmd);}static void write_addr(unsigned int addr){ nand_chip.write_addr(addr);}static unsigned char read_data(void){ return nand_chip.read_data();}/* 初始化NAND Flash */void nand_init(void){#define TACLS 0#define TWRPH0 3#define TWRPH1 0 /* 判断是S3C2410还是S3C2440 */ if ((GSTATUS1 == 0x32410000) || (GSTATUS1 == 0x32410002)) { nand_chip.nand_reset = s3c2410_nand_reset; nand_chip.wait_idle = s3c2410_wait_idle; nand_chip.nand_select_chip = s3c2410_nand_select_chip; nand_chip.nand_deselect_chip = s3c2410_nand_deselect_chip; nand_chip.write_cmd = s3c2410_write_cmd; nand_chip.write_addr = s3c2410_write_addr; nand_chip.read_data = s3c2410_read_data;/* 使能NAND Flash控制器, 初始化ECC, 禁止片选, 设置时序 */ s3c2410nand->NFCONF = (1<<15)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0); } else { nand_chip.nand_reset = s3c2440_nand_reset; nand_chip.wait_idle = s3c2440_wait_idle; nand_chip.nand_select_chip = s3c2440_nand_select_chip; nand_chip.nand_deselect_chip = s3c2440_nand_deselect_chip; nand_chip.write_cmd = s3c2440_write_cmd;#ifdef LARGER_NAND_PAGE nand_chip.write_addr = s3c2440_write_addr_lp;#elsenand_chip.write_addr = s3c2440_write_addr;#endif nand_chip.read_data = s3c2440_read_data;/* 设置时序 */ s3c2440nand->NFCONF = (TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4); /* 使能NAND Flash控制器, 初始化ECC, 禁止片选 */ s3c2440nand->NFCONT = (1<<4)|(1<<1)|(1<<0); } /* 复位NAND Flash */ nand_reset();}/* 读函数 */void nand_read(unsigned char *buf, unsigned long start_addr, int size){ int i, j;#ifdef LARGER_NAND_PAGE if ((start_addr & NAND_BLOCK_MASK_LP) || (size & NAND_BLOCK_MASK_LP)) { return ; /* 地址或长度不对齐 */ }#else if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) { return ; /* 地址或长度不对齐 */ }#endif /* 选中芯片 */ nand_select_chip(); for(i=start_addr; i < (start_addr + size);) { /* 发出READ0命令 */ write_cmd(0); /* Write Address */ write_addr(i);#ifdef LARGER_NAND_PAGE write_cmd(0x30);#endif wait_idle();#ifdef LARGER_NAND_PAGE for(j=0; j < NAND_SECTOR_SIZE_LP; j++, i++) {#else for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {#endif *buf = read_data(); buf++; } } /* 取消片选信号 */ nand_deselect_chip(); return ;}SECTIONS { firtst 0x00000000 : { head.o init.o nand.o} //nand flash 0地址放着 head.o init.o nand.o二进制文件 second 0x30000000 : AT(4096) { main.o } //在nand flash 4096地址放着 main.o二进制文件} 5.main.c
#defineGPFCON(*(volatile unsigned long *)0x56000050)#defineGPFDAT(*(volatile unsigned long *)0x56000054)#defineGPF4_out(1<<(4*2))#defineGPF5_out(1<<(5*2))#defineGPF6_out(1<<(6*2))void wait(volatile unsigned long dly){for(; dly > 0; dly--);}int main(void){unsigned long i = 0;GPFCON = GPF4_out|GPF5_out|GPF6_out;// 将LED1-3对应的GPF4/5/6三个引脚设为输出while(1){wait(30000);GPFDAT = (~(i<<4)); // 根据i的值，点亮LED1-3if(++i == 8)i = 0;}return 0;}6.Makefile
objs := head.o init.o nand.o main.onand.bin : $(objs)arm-linux-ld -Tnand.lds-o nand_elf $^arm-linux-objcopy -O binary -S nand_elf $@arm-linux-objdump -D -m arm nand_elf > nand.dis%.o:%.carm-linux-gcc -Wall -c -O2 -o $@ $<%.o:%.Sarm-linux-gcc -Wall -c -O2 -o $@ $<clean:rm -f nand.dis nand.bin nand_elf *.o
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