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:
2:d0ae519c229c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon Apr 06 04:59:45 2020 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400
\ No newline at end of file