SMA.hpp

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#pragma once
 
#include <AH/Containers/Array.hpp>
#include <AH/Math/Divide.hpp>
#include <AH/STL/algorithm>
#include <AH/STL/cstdint>
#include <AH/STL/type_traits>
 
 
template <uint8_t N, class input_t = uint16_t, class sum_t = uint32_t>
class SMA {
  public:
    SMA() = default;
 
    SMA(input_t initialValue) : sum(N * (sum_t)initialValue) {
        std::fill(std::begin(previousInputs), std::end(previousInputs),
                  initialValue);
    }
 
    input_t operator()(input_t input) {
        sum -= previousInputs[index];
        sum += input;
        previousInputs[index] = input;
        if (++index == N)
            index = 0;
        return AH::round_div<N>(sum);
    }
 
  private:
    uint8_t index = 0;
    input_t previousInputs[N] = {};
    sum_t sum = 0;
};