Embeded linux 之 mtd nand

应用层：(使用mtd ioctl)

0.获取mtd基本信息

struct mtd_info_user {
unsigned char type;　　//flash类型
unsigned int flags;　　  
unsigned int size; 　　  //分区大小
unsigned int erasesize; //块大小
unsigned int writesize;  //页数据大小
unsigned int oobsize;    //OOB大小
unsigned int ecctype;   //ECC类型
unsigned int eccsize;    //ECC大小
};

fd = open("/dev/mtd", O_RDWR);

ioctl(fd, MEMGETINFO, &mtd_info);

1.读页数据

2.写页数据

unsigned char pagedate[2048] = {...};

write(fd, pagedate, mtd_info.writesize);

3.读OOB

struct mtd_oob_buf {
unsigned int start;
unsigned int length;
unsigned char *ptr;
};

unsigned char oobbuf2[64];

OOB_INFO.start = page_num * (2048);
OOB_INFO.ptr = oobbuf2;
ioctl(fd, MEMREADOOB, &OOB_INFO);

4.写OOB

unsigned char oobbuf[64] = {...};

OOB_INFO.start = page_num * (2048);
OOB_INFO.ptr = oobbuf;
ioctl(fd, MEMWRITEOOB, &OOB_INFO);

 mtd demo