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A simple software counter is OK as long as pulses don't occur too fast; if the pulse drives an interrupt, you could maybe count to a few 100kHz without too much trouble. However if there's any risk of a second pulse occurring while the interrupt from the first is still being serviced, you will silently lose counts.
To reduce the risk of this, you will need to use an external or on-chip hardware counter to get the interrupt rate down to 10-100us-ish (depending on the uC and its clock rate and any other activities using same or higher-priority interrupts).
if the mcu has rising & falling edge capture timer, things become
more easy like this and the code is efficient using interrupt driver;
less system source will be consumed
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