STM32F429用SPI-FLASH+FatFS+USB模拟U盘，电脑无法识别。

发布于 2024-03-12 14:44:33 浏览：672 订阅该版

当前环境
1. 正点原子STM32F429阿波罗V1版本。
2. RT-thread 4.1.0版本

问题现象
1. 启动日志如下：

![1.png](https://oss-club.rt-thread.org/uploads/20240312/3bd39784e68980cb5272fd0fa559584f.png.webp)
：系统启动，先将W25Q256挂载上了文件系统。

2. 手动解除挂载

```c
int main(void)
{
    rt_pin_mode(LED0_PIN, PIN_MODE_OUTPUT);
    if (PCF8574_Init() == 0)
    {
        PCF8574_WriteBit(USB_PWR_IO, 1); // 开启USB HOST电源供电C
        rt_kprintf("PCF8574 init successful\r\n");
    }

while (1)
    {
        rt_pin_write(LED0_PIN, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LED0_PIN, PIN_LOW);
        rt_thread_mdelay(500);
    }
}

#define FS_PARTITION_NAME "W25Q256"

void mount_to_usb(void)
{
    char *fullpath = NULL;

fullpath = dfs_normalize_path(NULL, "/");
    if (dfs_unmount(fullpath) == 0)
    {
        rt_kprintf("mount_to_usb ok!\n");
    }
    else
    {
        rt_kprintf("mount_to_usb fail!\n");
    }
}
MSH_CMD_EXPORT(mount_to_usb, mount_to_usb);

void mount_to_flash(void)
{
    rt_device_t dev;

dev = rt_device_find(FS_PARTITION_NAME);
    if (dev != RT_NULL && dev->open_flag != 0)
    {
        rt_device_close(dev);
        rt_kprintf("close usb device ok!\n");
    }

if (dfs_mount(FS_PARTITION_NAME, "/", "elm", 0, 0) == 0)
    {
        rt_kprintf("mount_to_flash ok!\n");
    }
    else
    {
        rt_kprintf("mount_to_flash error!!\n");
    }
}
MSH_CMD_EXPORT(mount_to_flash, mount_to_flash);
```
![2.png](https://oss-club.rt-thread.org/uploads/20240312/89e62b32a9fcd0d23b1023968e60aeef.png.webp)

3. 此时插入电脑

![3.png](https://oss-club.rt-thread.org/uploads/20240312/4d457502a616163b486a4f78f731aecc.png.webp)

目前不知道问题出在哪里，求社区大佬求助！