Gert Jan Schoneveld / Mbed 2 deprecated SaveKeypad

Tests forked Keypad library.

Dependencies:   FPointer keypad mbed

Schematic:

http://schind.nl/keypad.png

No extra hardware is needed besides the wires and switches. The columns are outputs configured with open drain. The rows are inputs configured with pull up resistors. A key press pulls down its row. With scanning the column is determined thereafter.

See keypad for the forked library used in this project.

Diff: main.cpp

Revision:
2:eaa3d23e9b29
Parent:
1:8bbe2b267de6
Child:
3:fb173f712440
--- a/main.cpp	Sat Nov 03 21:48:39 2012 +0000
+++ b/main.cpp	Sat Nov 03 23:45:20 2012 +0000
@@ -28,10 +28,24 @@
     printf("*** Keypad Demo ***\n");
 
     Keypad keypad(p25, p26, p27, p28, p21, p22, p23, p24);
+
+// interrupt mode
     keypad.CallAfterInput(&cbAfterInput);
-
     keypad.Start();
     while (1) {
         Sleep();
     }
+    
+// polling mode
+/*
+    keypad.Start();
+    
+    int key = -1;
+    while (1) {
+        key = keypad.DebouncedScan();
+        if (key >= 0)
+            cbAfterInput(key);
+        wait(0.1);
+    }
+*/
 }
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