SEm-Labos/02-SplineInterpolator/SplineInterpolator/hdl/interpolatorCalculatePolynom_studentVersion.vhd

ARCHITECTURE studentVersion OF interpolatorCalculatePolynom IS

subtype sample_type is signed(coeffBitNb-1+oversamplingBitNb DOWNTO 0);
type order0 is array (0 to 0) of sample_type;
type order1 is array (0 to 1) of sample_type;
type order2 is array (0 to 2) of sample_type;
type order3 is array (0 to 3) of sample_type;
signal cA: order3;
signal cB: order2;
signal cC: order1;
signal cD: order0;

BEGIN

  process(clock, reset) begin
    if reset = '1' then
      cA <= (others => (others => '0'));
      cB <= (others => (others => '0'));
      cC <= (others => (others => '0'));
      cD <= (others => (others => '0'));
    elsif rising_edge(clock) then

      if restartPolynom = '1' then
        cA(3) <= (others => '0');
        cA(2) <= (others => '0');
        cA(1) <= (others => '0');
        cA(0) <= resize(a,sample_type'high+1);
        
        cB(2) <= (others => '0');
        cB(1) <= (others => '0');
        cB(0) <= resize(b,sample_type'high+1);
        
        cC(1) <= (others => '0');
        cC(0) <= resize(c,sample_type'high+1);

        cD(0) <= resize(d,sample_type'high+1);
        
      else

        cC(1) <= resize(c,sample_type'high+1) + cC(1);

        cB(2) <= cB(2) + resize(2*cB(1),sample_type'high+1) + b;
        cB(1) <= resize(b,sample_type'high+1) + cB(1);

        cA(3) <= cA(3) + resize(3*cA(2),sample_type'high+1) + resize(3*cA(1),sample_type'high+1) + a;
        cA(2) <= cA(2) + resize(2*cA(1),sample_type'high+1) + a;
        cA(1) <= resize(A,sample_type'high+1) + cA(1);

      end if;
    end if;
  end process;

  sampleOut <= resize(cA(3)+cB(2)+cC(1)+cD(0),signalBitNb);
END ARCHITECTURE studentVersion;