扇区大小大约FAT 大小

发布于 2021-08-17 11:37:12 浏览：1110 订阅该版

在STM32F4 片上创建分区失败，宏定义已经调为4096
```c
const struct fal_flash_dev stm32f2_onchip_flash =
{
    .name       = "stm32_onchip",               // name[]
    .addr       = 0x08000000,                   // addr
    .len        = 1024*1024,                    // len
    .blk_size   = 128*1024,                     // blk_size   stm32 FLASH     
    .ops        = {NULL, fal_flash_read, fal_flash_write, fal_flash_erase},
    .write_gran = 8
};
/* flash device table */
#define FAL_FLASH_DEV_TABLE                                          \
{                                                                    \
    &stm32f2_onchip_flash,                                           \
}
/* ====================== Partition Configuration ========================== */
#ifdef FAL_PART_HAS_TABLE_CFG
/* partition table */
//uint32_t magic_word      name[FAL_DEV_NAME_MAX] flash_name[FAL_DEV_NAME_MAX]  offset        len   reserved
#define FAL_PART_TABLE                                                               \
{                                                                                    \
    {FAL_PART_MAGIC_WORD,        "app",           "stm32_onchip",                  0,         896*1024, 0}, \
    {FAL_PART_MAGIC_WORD,        "fs",            "stm32_onchip",                  896*1024,  128*1024,  0}, \
}
#endif /* FAL_PART_HAS_TABLE_CFG */
```

```c
/* elm-chan's FatFs, Generic FAT Filesystem Module */

#define RT_DFS_ELM_CODE_PAGE 437
#define RT_DFS_ELM_WORD_ACCESS
#define RT_DFS_ELM_USE_LFN_3
#define RT_DFS_ELM_USE_LFN 3
#define RT_DFS_ELM_MAX_LFN 255
#define RT_DFS_ELM_DRIVES 2
****#define RT_DFS_ELM_MAX_SECTOR_SIZE 4096****
#define RT_DFS_ELM_REENTRANT
/* end of elm-chan's FatFs, Generic FAT Filesystem Module */
#define RT_USING_DFS_DEVFS
```

```c
static void fal_elmfat_sample(void)
{
    int fd, size;
    struct statfs elm_stat;
    struct fal_blk_device *blk_dev;
    char str[] = "elmfat mount to W25Q flash.", buf[80];

/* fal init */
    fal_init();
    // elmfat文件系统只能挂载到块设备上
    /* create block device */
    blk_dev = (struct fal_blk_device *)fal_blk_device_create(FS_PARTITION_NAME);// FAL块设备的创建与注册过程
    if(blk_dev == RT_NULL)
        rt_kprintf("Can't create a block device on '%s' partition.\n", FS_PARTITION_NAME);
    else
        rt_kprintf("Create a block device on the %s partition of flash successful.\n", FS_PARTITION_NAME);

/* make a elmfat format filesystem */
    if(dfs_mkfs("elm", FS_PARTITION_NAME) == 0)
        rt_kprintf("make elmfat filesystem success.\n");

/* mount elmfat file system to FS_PARTITION_NAME */
    if(dfs_mount(FS_PARTITION_NAME, "/", "elm", 0, 0) == 0)
        rt_kprintf("elmfat filesystem mount success.\n");
 }
```

串口打印：
``` 
 wIP-2.0.2 initialized!
[108] I/sal.skt: main: Socket Abstraction Layer initialize success.
[116] E/DFS: main: mount fs[elm] on / failed.