diff --git a/src/sendWRcmd.cpp b/src/sendWRcmd.cpp
index 1106652..afca5a6 100644
--- a/src/sendWRcmd.cpp
+++ b/src/sendWRcmd.cpp
@@ -563,11 +563,17 @@ bool sendFDcmd_get(uint8_t *nextWrCmd, uint8_t *nextRdCmd, uint8_t *blockNum, ui
 
 uint8_t check4FDshortCmd(void)
 {
-    // returns number of waiting command
+    // returns number of waiting command, max FDCMD_STACKDEPTH
     return p_nextFDcmdsInQueue;
 }
 
 
+uint8_t check4freeFDshortCmd(void)
+{
+    // returns number of free places in short-command stack
+    return FDCMD_STACKDEPTH - p_nextFDcmdsInQueue;
+}
+
 
 // long command, 64 data bytes
 static uint8_t longFDwrCmd[FDLONG_STACKDEPTH];
@@ -602,7 +608,7 @@ bool longFDcmd_set(uint8_t nextWrCmd, uint8_t nextRdCmd, uint8_t blockNum, uint8
     uint8_t nn;
     if (p_longFDcmdsInQueue>=FDLONG_STACKDEPTH)
     {
-        qCritical() << "cannot save cmd because stack is full";
+        qDebug() << "cannot save cmd because stack is full";
         return false;           // not possible
     }
     longFDwrCmd[p_longFDcmdsInQueue]=nextWrCmd;
@@ -613,7 +619,6 @@ bool longFDcmd_set(uint8_t nextWrCmd, uint8_t nextRdCmd, uint8_t blockNum, uint8
         longFDpara[p_longFDcmdsInQueue][nn]=data[nn];
 
     p_longFDcmdsInQueue++;
-
     return true;                // ok, will be sent
 }
 
@@ -659,5 +664,10 @@ uint8_t check4FDlongCmd(void)
     return p_longFDcmdsInQueue;
 }
 
+uint8_t check4freeFDlongCmd(void)
+{
+    // returns number of free places in command stack
+    return FDLONG_STACKDEPTH - p_longFDcmdsInQueue;
+}