#include <stddef.h>

#include "debounce.h"

void debounce_init(sample_state *ss,
	bool initial, uint32_t threshold)
{
	ss->candidate = initial;
	ss->count = ss->count_reset = threshold;
}

bool *debounce(sample_state *ss, bool val)
{
	if (val == ss->candidate)
		ss->count = ss->count_reset;
	else if (--ss->count == 0)
	{
		ss->candidate = val;
		ss->count = ss->count_reset;
		return &ss->candidate;
	}
	return NULL;
}