worked on FAT stuff and tests

ext/sd/fat32/FreeClusterIterator.h

@@ -1,6 +1,10 @@
 #pragma once
 
-/** helper class to iterate all free clusters of the Filesystem */
+/**
+ * helper class to iterate all free clusters of the Filesystem.
+ * starts at cluster number 2 and then iterates over all subsequent clusters
+ * stopping at the free ones
+ */
 class FreeClusterIterator {
 
 	FS& fs;
@@ -15,6 +19,8 @@ public:
 	/** get the next free cluster that is available */
 	ClusterNr next() {
 
+		// TODO: end of filesystem reached
+
 		while(true) {
 			const ClusterNr tmp = fs.getNextCluster(cur);
 			if (tmp.isFree()) {return cur;}