FS queue size configurable

bsp_q7s/memory/SdCardManager.h

@@ -56,8 +56,21 @@ public:
      */
     static SdCardManager* instance();
 
+    /**
+     * Set the preferred SD card which will determine which SD card will be used as the primary
+     * SD card in hot redundant and cold redundant mode. This function will not switch the
+     * SD cards which are currently on and mounted, this needs to be implemented by
+     * an upper layer by using #switchOffSdCard , #switchOnSdCard and #updateSdCardStateFile
+     * @param sdCard
+     * @return
+     */
     ReturnValue_t setPreferredSdCard(sd::SdCard sdCard);
 
+    /**
+     * Get the currently configured preferred SD card
+     * @param sdCard
+     * @return
+     */
     ReturnValue_t getPreferredSdCard(sd::SdCard& sdCard) const;
 
     /**
@@ -124,8 +137,6 @@ private:
 
     ReturnValue_t setSdCardState(sd::SdCard sdCard, bool on);
 
-    sd::SdCard preferredSdCard = sd::SdCard::SLOT_0;
-
     void processSdStatusLine(SdStatusPair& active, std::string& line, uint8_t& idx,
             sd::SdCard& currentSd);