Frequency Counter Library. Only for mbed LPC1768, mbed LPC1114FN28, Nucleo-F401 and Nucleo-F411. No way to change pin assign.

Dependents:   Frequency_Counter Frequency_wind_speed_measure Frequency_counter_wind_speed

Please refer following page.
http://developer.mbed.org/users/kenjiArai/notebook/simple-frequency-counter/