1 files changed, 10 insertions, 2 deletions
diff --git a/hal/pin.hpp b/hal/pin.hpp
index bbb80dc..ab9d3ad 100644
--- a/hal/pin.hpp
+++ b/hal/pin.hpp
@@ -17,12 +17,19 @@ class gpio
 public:
     virtual ~gpio() {}
 
-    // digital functions
+    // digital mode methods
     virtual void set_mode(unsigned m) = 0;
+
+    // digital output methods
     virtual void set(unsigned s) = 0;
-    virtual unsigned read() const = 0; 
+    virtual unsigned is_set() const = 0;
     virtual void toggle() = 0;
 
+    // digital input methods
+    virtual unsigned read() const = 0; 
+
+    // TODO: analog mode methods
+
 protected:
     gpio() {}
 };
@@ -47,6 +54,7 @@ public:
     void set_mode(mode m);
 
     unsigned read() const;
+    unsigned is_set() const;
 
     void set(unsigned s);
     void set(state s);