flix

// Copyright (c) 2023 Oleg Kalachev <okalachev@gmail.com>
// Repository: https://github.com/okalachev/flix

// Time related functions

#include "Arduino.h"
#include "flix.h"

float t = NAN; // current time, s
float dt; // time delta with the previous step, s
float loopRate; // Hz

void step() {
	float now = micros() / 1000000.0;
	dt = now - t;
	t = now;

	if (!(dt > 0)) {
		dt = 0; // assume dt to be zero on first step and on reset
	}

	computeLoopRate();
}

void computeLoopRate() {
	static float windowStart = 0;
	static uint32_t rate = 0;
	rate++;
	if (t - windowStart >= 1) { // 1 second window
		loopRate = rate;
		windowStart = t;
		rate = 0;
	}
}