Tried using switch

Dependencies:   FastPWM MODSERIAL QEI mbed

Revision:
0:755bc7c0f555
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QEI.lib	Wed Oct 31 10:44:10 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/aberk/code/QEI/#5c2ad81551aa