<= should be >=

sufst-controller/sd.cpp

@@ -56,7 +56,7 @@ void sdProcess()
 
         sdWritesCntBeforeFlush++;
 
-        if (sdWritesCntBeforeFlush <= SD_WRITES_BEFORE_FLUSH) {
+        if (sdWritesCntBeforeFlush >= SD_WRITES_BEFORE_FLUSH) {
             file.flush();
 
             sdWritesCntBeforeFlush = 0;