请问如果将AT45DB161D格式化成为elm文件系统?

发布于 2010-07-29 15:37:24 浏览：4697 订阅该版

void rt_hw_spiflash_init(void)
{
	rt_uint32_t n;
	rt_uint8_t* sector;
	
	spi_flash.type     = RT_Device_Class_Block;
	spi_flash.init     = rt_spiflash_init;
	spi_flash.open     = rt_spiflash_open;
	spi_flash.close    = rt_spiflash_close;
	spi_flash.read     = rt_spiflash_read;
	spi_flash.write    = rt_spiflash_write;
	spi_flash.control  = rt_spiflash_control;
	spi_flash.private  = RT_NULL;

at45db_SetPageSize();	// 设置为512字节模式

/* get the first sector to read partition table */
	sector = (rt_uint8_t*) rt_malloc (512);
	if (sector == RT_NULL)
	{
		rt_kprintf("allocate partition sector buffer failedn");
		return;
	}

n = rt_spiflash_read((rt_device_t)&spi_flash, 0, sector, 512);
	if (n == 512)
	{
		rt_err_t status;

/* get the first partition */
		status = dfs_filesystem_get_partition(&spi_flash_part, sector, 0);
		if (status != RT_EOK)
		{
			/* there is no partition table */
			spi_flash_part.offset = 0;
			spi_flash_part.size   = 0;
		}
	}
	else
	{
		/* there is no partition table */
		spi_flash_part.offset = 0;
		spi_flash_part.size   = 0;
	}

/* release sector buffer */
	rt_free(sector);

/* register sd device */
	rt_device_register(&spi_flash, "spi0", RT_DEVICE_FLAG_RDWR);
}
这个成功了，运行结果:
finsh>>list_device()
device    type
-------- ----------
spi0     Block Device
sd0      Block Device
uart1    Character Device
        0, 0x00000000

然后dfs_mount("spi0", "/", "elm", 0, 0) 就不成功，是因为flash没有格式化？
如果要在系统内对flash进行格式化，要怎样操作咧?

5 个回答

aozima 2010-07-29

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。

jerry 2010-07-29

这家伙很懒，什么也没写！

感谢！ 已经在stm32radio中找到了mkfs的方法。
在dfs_elm.c中实现DRESULT disk_ioctl (BYTE drv, BYTE ctrl, void *buff)函数,
然后完成下面的代码,就可以在finsh中使用mkfs命令了 [s:175]

```

/* ELM format function */
int mkfs(const char* device)
{
	BYTE drv;
	rt_device_t dev;
	FRESULT result;

/* find device name */
	for (drv = 0; drv < _DRIVES; drv ++)
	{
		dev = disk[drv];
		if (rt_strncmp(dev->parent.name, device, RT_NAME_MAX) == 0)
		{
			/* Partitioning rule 0:FDISK */
			/* Auto selection of cluster size */
			result = f_mkfs(drv, 0, 0);
			if ( result != FR_OK)
			{
				rt_kprintf("format errorn");
				return elm_result_to_dfs(result);
			}

return DFS_STATUS_OK;
		}
	}

/* can't find device driver */
	rt_kprintf("can not find device driver: %sn", device);
	return -DFS_STATUS_EIO;
}
#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT(mkfs, make filesystem on disk);
#endif

```

但是有个很奇怪的问题,在dfs_mount文件系统时,这样写就会不停发生异常：

```

dfs_init();
		elm_init();
		if (dfs_mount("sd0", "/", "elm", 0, 0) == 0)
		{
			rt_kprintf("SD File System initialized!n");
			if (dfs_mount("spi0", "/SPI", "elm", 0, 0) ==0 )
				rt_kprintf("SPI File System initialized!n");
			else
				rt_kprintf("SPI File System init failed!n");
		}
		else
			rt_kprintf("SD File System init failed!n");

```

这样写就不会发生:

```

dfs_init();
		elm_init();
		if (dfs_mount("sd0", "/", "elm", 0, 0) == 0)
			rt_kprintf("SD File System initialized!n");
		else
			rt_kprintf("SD File System init failed!n");

if (dfs_mount("spi0", "/SPI", "elm", 0, 0) ==0 )
			rt_kprintf("SPI File System initialized!n");
		else
			rt_kprintf("SPI File System init failed!n");

```