Basic DC motor control test, rpm feedback by simple impulse signal, PID speed control.

Dependencies:   FastPWM mbed FastIO MODSERIAL

Revision:
2:70918f7f8451
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FastIO.lib	Fri Mar 23 12:31:38 2018 +0000
@@ -0,0 +1,1 @@
+http://os.mbed.com/users/Sissors/code/FastIO/#45b32f07e790