5 文件系统报ENOMEM，一共32k ram，15k heap空间

发布于 2022-07-15 11:05:59 浏览：570 订阅该版

dfs_mkfs 报错，ENOMEM

```c
 \ | /
- RT -     Thread Operating System
 / | \     3.1.5 build Jul 15 2022
 2006 - 2020 Copyright by rt-thread team
spi10 attach to spi1 donespi device attach result = 0
spi1 init done
[I/SFUD] Find a Winbond flash chip. Size is 16777216 bytes.
[I/SFUD] w25q128 flash device is initialize success.
[I/SFUD] Probe SPI flash w25q128 by SPI device spi10 success.
use rt_spi_send_then_recv() read w25q ID is: 0x17ef
use rt_spi_send_then_recv() read w25q JEDEC ID is: 0xef601800
use rt_spi_transfer_message() read w25q ID is: 0x17ef
use rt_spi_transfer_message() read w25q JEDEC ID is: 0xef601800
No Filesystem: -1!
sorry, there is no mem to do mkfs: -19! 
dfs mkfs err: -19
Write string BEIJING, July 5 (Xinhua) -- Chinese President Xi Jinping on Tuesday sent a congratulatory message to President of
msh />
```

主函数：

```c
/* 挂载 elm 文件系统到 / 目录，如果你所使用的开发板没有文件系统也可以跳过这一步 */
    res = dfs_mount(EXAMPLES_SPI_CHIP_NAME, "/", EXAMPLES_SPI_FS_NAME, 0, 0);
    if (res == 0)
    {
        rt_kprintf("Filesystem initialized!\r\n");
    }
    else
    {
        rt_kprintf("No Filesystem: %d!\r\n", res);
        /* 如果挂载失败，则尝试在文件系统分区重新创建文件系统 */
        res = dfs_mkfs(EXAMPLES_SPI_FS_NAME, EXAMPLES_SPI_CHIP_NAME);
        if(res == 0)
        {
            rt_kprintf("dfs mkfs succ\r\n");
            /* 尝试重新挂载文件系统 */
            if (dfs_mount(EXAMPLES_SPI_CHIP_NAME, "/", EXAMPLES_SPI_FS_NAME, 0, 0) == 0)
            {
                /* 仍然挂载文件系统失败，请自行检查失败原因 */
                rt_kprintf("Failed to initialize filesystem!\r\n");
            }
        }
        else
        {
            rt_kprintf("dfs mkfs err: %d\r\n", res);
        }
        
    }

rt_kprintf("Write string %s to test.txt.\r\n", Tx_Buffer);
```

debug发现错误出现位置在dfs_elm.c  236行 malloc失败。如图：

![0000.png](https://oss-club.rt-thread.org/uploads/20220715/9a9f429812d91b59b68c13b0a5987a00.png.webp "0000.png")

debug查看初始化Heap空间大小，如图：

![000.png](https://oss-club.rt-thread.org/uploads/20220715/1b49c4eb3bf549cd339dfc250ac56879.png.webp "000.png")

15k heap空间不够RT-Thread + DFS使用吗？