应用程序操作NorFlash示例代码分享(norflash接口使用方法)

//    glob_t mtdbuf;
    struct mtd_info_user mtd;
    struct erase_info_user erase;
    int blocks = 0;
    int i = 0;  //用于控制擦除的块的个数
    int k = 0;
    int written = 0;  //已写入的字节数，只初始化一次
    unsigned int size = StateOfImage.st_size;  //应该是镜像的实际大小，因为内存中大于镜像的空间的内容不可预知
    unsigned int result = 0;
    unsigned int DevNum = 0;    //设备的数量
    unsigned int StartDev = 0;  //从第startDev开始擦除
    char DevName[20] = {0};
    unsigned int AllSize = 0;
    #define MAXPARTITIONS 40
    struct DeviceInfo
    {
        int fd;
        char dir[20];
        uint32_t size;     // Total size of the MTD
        uint32_t erasesize;

    }DevInfo[MAXPARTITIONS];//用来存储设备信息

    bzero(DevInfo, sizeof(struct DeviceInfo));

/* 这是一种方法，但是有一个缺点，当mtd设备大于10个是，通过glob搜索出来的结果
   会出问题，下面采用会采用第二种方法 */
//    if(searchmtd(&mtdbuf) != 0){

//        DEBUG("Sorry! Can not find mtd device\n");
//        return 1;   //返回大于零的数，表示升级失败
//    }
//    else
//    {
//        int fd;
//       
//        DEBUG("find %d mtd devices \n",mtdbuf.gl_pathc);
//        DevNum = mtdbuf.gl_pathc;

//        for(i=0; i<DevNum; i++)
//        {
//            fd = safeOpen (mtdbuf.gl_pathv[i],O_SYNC | O_RDWR);
//            if(fd < 0)
//            {
//                printf("failt to open\n");
//                return 1;
//            }
//            bzero(&mtd, sizeof(struct mtd_info_user));
//            if (ioctl(fd, MEMGETINFO,&mtd) < 0)
//            {
//                DEBUG("ioctl(): %m\n");
//                DEBUG("This doesn't seem to be a valid MTD flash device!\n");
//                return 1;
//            }
//           
//            strcpy(DevInfo[i].dir, mtdbuf.gl_pathv[i]);
//            DevInfo[i].fd = fd;
//            DevInfo[i].size = mtd.size;
//            DevInfo[i].erasesize = mtd.erasesize;
//        }

//        globfree(&mtdbuf);
//        for(i=0; i<DevNum; i++)
//        {
//            printf("\n\tinfo of %s\n",DevInfo[i].dir);
//            printf("%s.fd:            %d\n",DevInfo[i].dir, DevInfo[i].fd);
//            printf("%s.size:          %d\n",DevInfo[i].dir,DevInfo[i].size);
//            printf("%s.erasesize:     %d\n",DevInfo[i].dir,DevInfo[i].erasesize);
//        }
//    }

/* 下面是第二种方法，这种方法克服了第一种方法的缺陷，不受mtd设备数量的限制 */

    for(i=0; i<MAXPARTITIONS; i++)
    {
        int fd;
        sprintf(DevName, "%s%d", "/dev/mtd",i);

        if((fd = open (DevName,O_SYNC | O_RDWR)) > 0)
        {
            bzero(&mtd, sizeof(struct mtd_info_user));
            if (ioctl(fd, MEMGETINFO,&mtd) < 0)
            {
                DEBUG("ioctl(): %m\n");
                DEBUG("This doesn't seem to be a valid MTD flash device!\n");
                return 1;
            }
            strcpy(DevInfo[i].dir, DevName);
            DevInfo[i].fd = fd;
            DevInfo[i].size = mtd.size;
            DevInfo[i].erasesize = mtd.erasesize;
        }
        else
        {
            DevNum = i;
            break;
        }

    }

    for(i=0; i<DevNum; i++)
    {
        printf("\n\tinfo of %s\n",DevInfo[i].dir);
        printf("%s.fd:            %d\n",DevInfo[i].dir, DevInfo[i].fd);
        printf("%s.size:          %d\n",DevInfo[i].dir,DevInfo[i].size);
        printf("%s.erasesize:     %d\n",DevInfo[i].dir,DevInfo[i].erasesize);
        AllSize += DevInfo[i].size;
     }