Fix: add sdcard detect before mount

Add sdcard detect before mount in case auto mount failed.

Author: LinuxMint-User

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

@@ -15,6 +15,7 @@
 #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"
@@ -30,32 +31,27 @@
 #ifdef BSP_USING_SDCARD_FATFS
 static int onboard_sdcard_mount(void)
 {
-    int retry_count = 0;
-    const int max_retries = 10;
-    const int retry_delay = 500;
+    rt_device_t device;
 
-    for (retry_count = 0; retry_count < max_retries; retry_count++)
+    device = rt_device_find("sd0");
+    if (device == NULL)
     {
-        if (rt_device_find("sd0") != RT_NULL)
+        mmcsd_wait_cd_changed(0);
+        stm32_mmcsd_change();
+        mmcsd_wait_cd_changed(500);
+        device = rt_device_find("sd0");
+    }
+    if (device != RT_NULL)
+    {
+        if (dfs_mount("sd0", "/sdcard", "elm", 0, 0) == RT_EOK)
         {
-            if (dfs_mount("sd0", "/sdcard", "elm", 0, 0) == RT_EOK)
-            {
-                LOG_I("SD card mount to '/sdcard'");
-                return RT_EOK;
-            }
+            LOG_I("SD card mount to '/sdcard'");
         }
-
-        /* retry after delay */
-        rt_thread_mdelay(retry_delay);
-
-        if (retry_count == 0)
+        else
         {
-            LOG_I("Waiting for SD card initialization...");
+            LOG_W("SD card mount to '/sdcard' failed!");
         }
     }
-
-    LOG_E("SD card mount to '/sdcard' failed after %d retries!", max_retries);
-    return -RT_ERROR;
 }
 #endif /* BSP_USING_SDCARD_FATFS */