Very accurate timer implementation

[Deouss]

I was able to generate signal using RMT that had around 6us period. Just use the carrier of TX.
Anyways RMT becomes unstable at around 40MHz because of lot of noise and you need some kind of filtering and circuit stabilization.

[holopaul]

@deouss, i need to capture a signal, not generate it. the problem is that the my signal is too long for the 15 bit timer resolution.