Fix: add sdcard detect before mount

Add sdcard detect before mount in case auto mount failed.

bsp/stm32/stm32f407-atk-explorer/board/ports/drv_filesystem.c

@@ -1,19 +1,21 @@
 /*
- * Copyright (c) 2006-2021, RT-Thread Development Team
+ * Copyright (c) 2006-2026, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
- * Date           Author       Notes
- * 2018-12-13     balanceTWK   add sdcard port file
- * 2021-05-10     Meco Man     fix a bug that cannot use fatfs in the main thread at starting up
- * 2021-07-28     Meco Man     implement romfs as the root filesystem
+ * Date           Author         Notes
+ * 2018-12-13     balanceTWK     add sdcard port file
+ * 2021-05-10     Meco Man       fix a bug that cannot use fatfs in the main thread at starting up
+ * 2021-07-28     Meco Man       implement romfs as the root filesystem
+ * 2026-01-13     LinuxMint-User add sdcard detect before mount in case auto mount failed
  */
 
 #include <rtthread.h>
 #include <dfs_romfs.h>
 #include <dfs_fs.h>
 #include <dfs_file.h>
+#include "drv_sdmmc.h"
 
 #if DFS_FILESYSTEMS_MAX < 4
 #error "Please define DFS_FILESYSTEMS_MAX more than 4"
@@ -29,15 +31,28 @@
 #ifdef BSP_USING_SDCARD_FATFS
 static int onboard_sdcard_mount(void)
 {
-    if (dfs_mount("sd0", "/sdcard", "elm", 0, 0) == RT_EOK)
+    rt_device_t device;
+
+    device = rt_device_find("sd0");
+    if (device == NULL)
     {
-        LOG_I("SD card mount to '/sdcard'");
+        mmcsd_wait_cd_changed(0);
+        stm32_mmcsd_change();
+        mmcsd_wait_cd_changed(rt_tick_from_millisecond(500));
+        device = rt_device_find("sd0");
     }
-    else
+
+    if (device != RT_NULL)
     {
-        LOG_E("SD card mount to '/sdcard' failed!");
+        if (dfs_mount("sd0", "/sdcard", "elm", 0, 0) == RT_EOK)
+        {
+            LOG_I("SD card mount to '/sdcard'");
+        }
+        else
+        {
+            LOG_W("SD card mount to '/sdcard' failed!");
+        }
     }
-
     return RT_EOK;
 }
 #endif /* BSP_USING_SDCARD_FATFS */
@@ -112,3 +127,4 @@ static int filesystem_mount(void)
     return RT_EOK;
 }
 INIT_APP_EXPORT(filesystem_mount);
+