Diff: core/automaton.cpp

Revision:

26:b4421d1ee57a

Parent:

4:fcf597f82632

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/automaton.cpp	Thu Jul 05 20:15:37 2018 +0000
@@ -0,0 +1,66 @@
+#include "automaton.h"
+
+//#define DEBUG_AUTOMATON
+
+#ifdef DEBUG_AUTOMATON
+#include "IO.h"
+#define LOG_DEBUG(msg) IO::debug(msg)
+#else
+#define LOG_DEBUG(msg)
+#endif
+
+namespace automaton {
+    
+    Callback<void()> entry;
+    Callback<void()> teardown_prev;
+    Callback<void()> setup_next;
+    volatile Event      event;
+    
+    void makeTransition();
+    
+    void empty_entry_callback()
+    {
+        event = Done;
+    }
+    
+    void do_nothing_callback(){  } // do nothing
+    
+    void run(){
+        event = None;
+        
+        // go into the entry point
+        LOG_DEBUG("starting");
+        entry();
+        
+        while(event != Done){
+            // wait until event status changes
+            while(event == None);
+            
+            switch(event){
+            case Transition:
+                makeTransition();
+                break;
+            case Done:
+                break;
+            default:
+                // TODO: handle error more nicely
+                LOG_DEBUG("unexpected event");
+                event = Done;
+                break;
+            }
+        }
+        
+        // cleaning up the last state
+        teardown_prev();
+        
+        // pc.printf("done.\r\n");
+    }
+    
+    void makeTransition()
+    {
+        LOG_DEBUG("transition");
+        teardown_prev();
+        setup_next();
+        event = None;
+    }
+}