Keypad program runs on OS2. Extended not only 3x4 but 4x4,4x5 and 5x5 keys.

Dependencies:   mbed Keypad

see /users/kenjiArai/notebook/keypadkey-matrix--control/

Revision:
1:abadd53f2072
Child:
2:d0ae519c229c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Keypad.lib	Sat Sep 30 23:29:05 2017 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/kenjiArai/code/Keypad/#ed0ad90ad734