api - doxygen improvements, unused parameters fixes

This patch is taken from mbed-drivers master.

hal/api/CThunk.h

@@ -19,6 +19,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+/* General C++ Object Thunking class
+ *
+ * - allows direct callbacks to non-static C++ class functions
+ * - keeps track for the corresponding class instance
+ * - supports an optional context parameter for the called function
+ * - ideally suited for class object receiving interrupts (NVIC_SetVector)
+ */
+
 #ifndef __CTHUNK_H__
 #define __CTHUNK_H__
 

hal/api/DirHandle.h

@@ -82,7 +82,7 @@ public:
      *
      *  @param location The location to seek to. Must be a value returned by telldir.
      */
-    virtual void seekdir(off_t location) { }
+    virtual void seekdir(off_t location) { (void)location;}
 
     virtual ~DirHandle() {}
 };

hal/api/FileSystemLike.h

@@ -61,7 +61,7 @@ public:
      *  @param filename the name of the file to remove.
      *  @param returns 0 on success, -1 on failure.
      */
-    virtual int remove(const char *filename) { return -1; };
+    virtual int remove(const char *filename) { (void) filename; return -1; };
 
     /** Rename a file in the filesystem.
      *
@@ -72,7 +72,7 @@ public:
      *    0 on success,
      *   -1 on failure.
      */
-    virtual int rename(const char *oldname, const char *newname) { return -1; };
+    virtual int rename(const char *oldname, const char *newname) { (void) oldname, (void) newname; return -1; };
 
     /** Opens a directory in the filesystem and returns a DirHandle
      *   representing the directory stream.
@@ -83,7 +83,7 @@ public:
      *    A DirHandle representing the directory stream, or
      *   NULL on failure.
      */
-    virtual DirHandle *opendir(const char *name) { return NULL; };
+    virtual DirHandle *opendir(const char *name) { (void) name; return NULL; };
 
     /** Creates a directory in the filesystem.
      *
@@ -94,7 +94,7 @@ public:
      *    0 on success,
      *   -1 on failure.
      */
-    virtual int mkdir(const char *name, mode_t mode) { return -1; }
+    virtual int mkdir(const char *name, mode_t mode) { (void) name, (void) mode; return -1; }
 
     // TODO other filesystem functions (mkdir, rm, rn, ls etc)
 };

hal/api/mbed.h

@@ -27,6 +27,7 @@
 // mbed Debug libraries
 #include "mbed_error.h"
 #include "mbed_interface.h"
+#include "mbed_assert.h"
 
 // mbed Peripheral components
 #include "DigitalIn.h"