828/applications/mount_sdio_elmfatfs.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021-07-29     andy       the first version
 */
#include <rtthread.h>
#include "dfs_fs.h"


#define DBG_TAG "mount_fs"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>

rt_sem_t mount_sem = RT_NULL;

void sd_mount(void *parameter)
{
    LOG_I("SD mount thread started, waiting for SD card...");
    int retry = 0;
       while (retry<10)
       {
           if (rt_device_find("sd0") != RT_NULL)
           {
               if (dfs_mount("sd0", "/", "elm", 0, 0) == RT_EOK)
               {
                   LOG_I("SD card mounted to '/' successfully");
                   // 挂载成功，释放信号量
                   if (mount_sem != RT_NULL)
                   {
                       rt_sem_release(mount_sem);
                   }
                   break; // 退出线程循环
               }
               else
               {
                   LOG_W("SD card mount failed, retrying...");
               }
           }
           else
           {
               LOG_D("SD device 'sd0' not found, retrying...");
           }

           // 避免空转，延时 100ms 再试
           rt_thread_mdelay(500);
           retry++;
       }
}

int stm32_sdcard_mount(void)
{
    rt_thread_t tid;

      // 删除旧的信号量（如果存在）
      if (mount_sem != RT_NULL)
      {
          rt_sem_delete(mount_sem);
      }

      // 创建计数信号量，初始值为 0
      mount_sem = rt_sem_create("sd_mount", 0, RT_IPC_FLAG_FIFO);
      if (mount_sem == RT_NULL)
      {
          LOG_E("Failed to create semaphore for SD mount!");
          return -RT_ENOMEM;
      }

      tid = rt_thread_create("sd_mount",
                             sd_mount,
                             RT_NULL,
                             4096,  // 建议增大栈，避免溢出
                             RT_THREAD_PRIORITY_MAX - 2,
                             20);
      if (tid != RT_NULL)
      {
          rt_thread_startup(tid);
          LOG_I("SD mount thread created and started");
      }
      else
      {
          LOG_E("Failed to create SD mount thread!");
          rt_sem_delete(mount_sem);
          mount_sem = RT_NULL;
          return -RT_ERROR;
      }

      return RT_EOK;
}
// 使用 INIT_COMPONENTS_INIT 或 INIT_APP_EXPORT 自动启动
//INIT_COMPONENTS_INIT(stm32_sdcard_mount);  // 在组件初始化阶段运行
INIT_APP_EXPORT(stm32_sdcard_mount);