Revision 14:2073b80c69cd, committed 2016-11-04

Comitter:

ryood

Date:

Fri Nov 04 16:09:03 2016 +0000

Parent:

13:75af5ebeecea

Commit message:

keypad 4x4: Debounce

Changed in this revision

--- a/ExioMcp23s17Keypad4x4.h	Fri Nov 04 15:17:32 2016 +0000
+++ b/ExioMcp23s17Keypad4x4.h	Fri Nov 04 16:09:03 2016 +0000
@@ -18,7 +18,9 @@
 public:
     ExioMcp23s17Keypad4x4(ExioMcp23s17* _pDevice, ExioPort _port) :
         pDevice(_pDevice),
-        port(_port)
+        port(_port),
+        keyVal(-1),
+        keyBuffer(-1)
     {
         pDevice->ioDirection(port, IO_DIRECTION);
         pDevice->ioPullup(port, IO_PULLUP);
@@ -33,30 +35,6 @@
     void setSampleFrequency(int i) { ticker.attach_us(this, &ExioMcp23s17Keypad4x4::callback, i); }
     
     int read() { return keyVal; }
-
-    /*
-    //------------------------------------------------------
-    // keyScan(): 押して離されたキー
-    // return: キースキャンの結果 0..15
-    //         変化がない場合は -1
-    //------------------------------------------------------
-    int keyScan()
-    {
-        int kv, kvv;
-        // チャタリング防止
-        kv = keyScan1();
-        Thread::wait(10);
-        kvv = keyScan1();
-
-        if (kv == kvv) {
-            if (kv != keyBuff) {
-                keyBuff = kv;
-                return kv;
-            }
-        }
-        return -1;
-    }
-    */
     
 private:
     //------------------------------------------------------
@@ -64,7 +42,6 @@
     // return: キースキャンの結果 0..15
     //         押されていない場合は -1
     //------------------------------------------------------
-
     int keyScan1()
     {
       uint8_t data;
@@ -89,13 +66,19 @@
     // The Ticker callback function
     void callback()
     {
-        keyVal = keyScan1();
+        //チャタリング防止
+        int v = keyScan1();
+        if (v == keyBuffer) {
+            keyVal = v;
+        }
+        keyBuffer = v;
     }
     
     Ticker ticker;
     ExioMcp23s17* pDevice;
     ExioPort port;
     int keyVal;
+    int keyBuffer;
 };
 
 #endif //_MCP23S17Keypad4x4_