elm文件系统格式化问题

发布于 2018-08-10 13:56:53 浏览：2826 订阅该版

2 个回答

wandersky 2018-08-10

这家伙很懒，什么也没写！

解决办法如下：willow add为我添加的。

```
int dfs_elm_mkfs(rt_device_t dev_id)
{
#define FSM_STATUS_INIT            0
#define FSM_STATUS_USE_TEMP_DRIVER 1
    FATFS *fat = RT_NULL;
    BYTE *work;
    int flag;
    FRESULT result;
    int index;
    char logic_nbr[2] = {'0',':'};
    
    work = rt_malloc(_MAX_SS);
    if(RT_NULL == work) {
        return -ENOMEM;
    }

if (dev_id == RT_NULL)
    {
        rt_free(work); /* release memory */
        return -EINVAL;
    }

/* if the device is already mounted, then just do mkfs to the drv,
     * while if it is not mounted yet, then find an empty drive to do mkfs
     */

flag = FSM_STATUS_INIT;
    index = get_disk(dev_id);
    if (index == -1)
    {
        /* not found the device id */
        index = get_disk(RT_NULL);
        if (index == -1)
        {
            /* no space to store an temp driver */
            rt_kprintf("sorry, there is no space to do mkfs! \n");
            rt_free(work); /* release memory */
            return -ENOSPC;
        }
        else
        {
            fat = rt_malloc(sizeof(FATFS));
            if (fat == RT_NULL)
            {
                rt_free(work); /* release memory */
                return -ENOMEM;
            }

flag = FSM_STATUS_USE_TEMP_DRIVER;

disk[index] = dev_id;
            /* try to open device */
            rt_device_open(dev_id, RT_DEVICE_OFLAG_RDWR);

/* just fill the FatFs[vol] in ff.c, or mkfs will failded!
             * consider this condition: you just umount the elm fat,
             * then the space in FatFs[index] is released, and now do mkfs
             * on the disk, you will get a failure. so we need f_mount here,
             * just fill the FatFS[index] in elm fatfs to make mkfs work.
             */
            logic_nbr[0] = '0' + index;
            f_mount(fat, logic_nbr, (BYTE)index);
        }
    }
        else{        
               logic_nbr[0] = '0' + index;//willow add 
        }

/* [IN] Logical drive number */
    /* [IN] Format options */
    /* [IN] Size of the allocation unit */
    /* [-]  Working buffer */
    /* [IN] Size of working buffer */
    result = f_mkfs(logic_nbr, FM_ANY, 0, work, _MAX_SS);
    rt_free(work); work = RT_NULL;

/* check flag status, we need clear the temp driver stored in disk[] */
    if (flag == FSM_STATUS_USE_TEMP_DRIVER)
    {
        rt_free(fat);
        f_mount(RT_NULL, logic_nbr,(BYTE)index);
        disk[index] = RT_NULL;
        /* close device */
        rt_device_close(dev_id);
    }

if (result != FR_OK)
    {
        rt_kprintf("format error\n");
        return elm_result_to_dfs(result);
    }

return RT_EOK;
}
```