[求助]关于elmfat文件的挂载[已解决_第2页]

发布于 2013-03-26 14:53:17 浏览：5018 订阅该版

以前用V0.3的时候fat的挂载完全没问题，现在把操作系统升级到V1.1.0版，忽然fat就出现了问题，对比下发现是在如下函数中出现了问题：
``` int dfs_elm_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *data)
{
	FATFS *fat;
	FRESULT result;
	BYTE  index;

/* handle RT-Thread device routine */
	for (index = 0; index < _VOLUMES; index ++)
	{
		if (disk[index] == RT_NULL)
		{
			break;
		}
	}
	if (index == _VOLUMES)
		return -DFS_STATUS_ENOSPC;

/* get device */
	disk[index] = fs->dev_id;

fat = (FATFS *)rt_malloc(sizeof(FATFS));
	if (fat == RT_NULL)
	{
		return -1;
	}

/* mount fatfs, always 0 logic driver */
	result = f_mount(index, fat);
	if (result == FR_OK)
	{
		char drive[8];
		DIR * dir;

rt_snprintf(drive, sizeof(drive), "%d:/", index);
		dir = (DIR *)rt_malloc(sizeof(DIR));
		if (dir == RT_NULL)
			return -DFS_STATUS_ENOMEM;

/* open the root directory to test whether the fatfs is valid */
		result = f_opendir(dir, drive);
		if (result != FR_OK)
		{
			rt_free(dir);
			return elm_result_to_dfs(result);
		}
		rt_free(dir);

fs->data = fat;
	}
	else
	{
		rt_free(fat);
		return elm_result_to_dfs(result);
	}

return 0;
}```
主要是多了f_opendir这个函数，然后进行向下调用chk_mounted，然后继续调用fmt = check_fs(fs, bsect = 0);最终是在0xAA55那边return了。之前的fat是mount后直接赋值的所以我想把f_opendir这部分注释掉骗过去，结果……呵呵。这个错误卡了好几天了求助啊求助。

12 个回答

doushinide 2013-03-26

这家伙很懒，什么也没写！

我挂载了2个文件系统，fat在根目录，uffs在/dev，现在uffs过了，fat出现问题了。

```

void rt_init_thread_entry(void *parameter)
{
    int fd;
    rt_uint8_t i,buf_size, spare_buf_size;
    rt_uint8_t reg_read,reg_write;
    unsigned int index;
    
    rt_components_init();   
    
#ifdef RT_USING_DFS
    {

rt_kprintf("<FileSystem> Init...
");
        /* init the device filesystem */

if(dfs_mount("nor", "/", "elm", 0, 0)==0)
        {
            rt_kprintf("<FileSystem> Nor FS initialized!
");
            rt_kprintf("<FileSystem> ...........................[PASS]
");
        }
        else
        {
            rt_kprintf("<FileSystem> Nor FS init failed!
");    
            rt_kprintf("<FileSystem> ...........................[FAULT]
");
        }

if (dfs_mount("nand", "/dev", "uffs", 0, 0) == 0)
        {
            rt_kprintf("<FileSystem> Nand FS initialized!
");
			rt_kprintf("<FileSystem> ...........................[PASS]
");
        }
        else
		{
            rt_kprintf("<FileSystem> Nand FS init failed!
");
			rt_kprintf("<FileSystem> ...........................[FAULT]
");
		}
		rt_kprintf("----------------------------------------
");       
            ……

```

配置宏文件如下：

```

#define RT_USING_DFS_ELMFAT
#define RT_DFS_ELM_WORD_ACCESS
#define RT_DFS_ELM_DRIVES			2
#define RT_DFS_ELM_USE_LFN          1
#define RT_DFS_ELM_MAX_LFN          255
#define RT_DFS_ELM_MAX_SECTOR_SIZE  2048

/* SECTION: DFS options */
/* the max number of mounted filesystem */
#define DFS_FILESYSTEMS_MAX			2
/* the max number of opened files */
#define DFS_FD_MAX					12
/* the max number of cached sector */
#define DFS_CACHE_MAX_NUM   		2

```

aozima 2013-03-26

调网络不抓包，调I2C等时序不上逻辑分析仪，就像电工不用万用表！多用整理的好的文字，比截图更省流量，还能在整理过程中思考。

doushinide 2013-03-26

这家伙很懒，什么也没写！

aozima 2013-03-26

调网络不抓包，调I2C等时序不上逻辑分析仪，就像电工不用万用表！多用整理的好的文字，比截图更省流量，还能在整理过程中思考。

doushinide 2013-03-26

这家伙很懒，什么也没写！

haitao52198 2013-03-26

这家伙很懒，什么也没写！

prife 2013-03-26

这家伙很懒，什么也没写！

doushinide 2013-03-27

这家伙很懒，什么也没写！

prife 2013-03-27

这家伙很懒，什么也没写！

doushinide 2013-03-29

这家伙很懒，什么也没写！

经过反复查找终于找到了原因，如下：
V0.3.2 的 dfs_elm.c文件中，以下函数传入底层驱动函数的值与V1.1.0中的不同，由于本人驱动程序没变直接升级操作系统版本，结果杯具了~

```
DRESULT disk_read (BYTE drv, BYTE *buff, DWORD sector, BYTE count)
{
    rt_size_t result;
    rt_device_t device = disk[drv];
#if _MAX_SS != 512
    rt_size_t s_size = fs_tab[drv]->s_size;
#else
    rt_size_t s_size = 512;
#endif

result = rt_device_read(device, sector * s_size, buff, count * s_size);
	if (result == count * s_size)
	{
		return RES_OK;
	}

return RES_ERROR;
}

/* Write Sector(s) */
DRESULT disk_write (BYTE drv, const BYTE *buff, DWORD sector, BYTE count)
{
    rt_size_t result;
    rt_device_t device = disk[drv];
#if _MAX_SS != 512
    rt_size_t s_size = fs_tab[drv]->s_size;
#else
    rt_size_t s_size = 512;
#endif

result = rt_device_write(device, sector * s_size, buff, count * s_size);
	if (result == count * s_size)
	{
		return RES_OK;
	}

return RES_ERROR;
}
```

V1.1.0的dfs_elm.c文件中：

```

/* Read Sector(s) */
DRESULT disk_read(BYTE drv, BYTE *buff, DWORD sector, BYTE count)
{
	rt_size_t result;
	rt_device_t device = disk[drv];

result = rt_device_read(device, sector, buff, count);
	if (result == count)
	{
		return RES_OK;
	}

return RES_ERROR;
}

/* Write Sector(s) */
DRESULT disk_write(BYTE drv, const BYTE *buff, DWORD sector, BYTE count)
{
	rt_size_t result;
	rt_device_t device = disk[drv];

result = rt_device_write(device, sector, buff, count);
	if (result == count)
	{
		return RES_OK;
	}

return RES_ERROR;
}

```

由于rt_device_read/write的参数发生了改变，所以发生mkfs OK却挂不上去的情况.

参照realtouch例程中的spi_flash_w25qxx.c 文件的 w25qxx_flash_read/write函数修改代码，pos*2048，size*2048，问题解决。

```
static rt_size_t w25qxx_flash_read(rt_device_t dev,
                                   rt_off_t pos,
                                   void* buffer,
                                   rt_size_t size)
{
    flash_lock((struct spi_flash_device *)dev);

w25qxx_read(pos*spi_flash_device.geometry.bytes_per_sector,
                buffer,
                size*spi_flash_device.geometry.bytes_per_sector);

flash_unlock((struct spi_flash_device *)dev);

return size;
}

static rt_size_t w25qxx_flash_write(rt_device_t dev,
                                    rt_off_t pos,
                                    const void* buffer,
                                    rt_size_t size)
{
    flash_lock((struct spi_flash_device *)dev);

w25qxx_page_write(pos*spi_flash_device.geometry.bytes_per_sector,
                      buffer,
                      size*spi_flash_device.geometry.bytes_per_sector);

flash_unlock((struct spi_flash_device *)dev);

return size;
}
```