diff options
Diffstat (limited to 'basys3')
| -rw-r--r-- | basys3/basys3.srcs/apu_note_to_frequency.vhd | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/basys3/basys3.srcs/apu_note_to_frequency.vhd b/basys3/basys3.srcs/apu_note_to_frequency.vhd index 878da30..b8f561b 100644 --- a/basys3/basys3.srcs/apu_note_to_frequency.vhd +++ b/basys3/basys3.srcs/apu_note_to_frequency.vhd @@ -6,35 +6,36 @@ entity apu_note_to_frequency is port ( -- clk : in std_logic; -- rst : in std_logic; - data : in std_logic_vector(7 downto 0); - freq : out std_logic_vector(11 downto 0) --frequency + data : in std_logic_vector(6 downto 0); + freq : out std_logic_vector(11 downto 0) -- frequency ); end entity; architecture Behavioral of apu_note_to_frequency is signal buffSmall : std_logic_vector(7 downto 0) := (others => '0'); -signal buff : std_logic_vector(15 downto 0) := (others => '0'); +signal buff : std_logic_vector(11 downto 0) := (others => '0'); signal shift : integer; begin shift <= to_integer(unsigned( data(2 downto 0) )); - buffSmall <= - x"F0" when data(7 downto 3) = (x"C" & '0') else -- C 496 - x"D0" when data(7 downto 3) = (x"C" & '1') else -- C# 464 - x"B0" when data(7 downto 3) = (x"D" & '0') else -- D 432 - x"A0" when data(7 downto 3) = (x"D" & '1') else -- D# 416 - x"80" when data(7 downto 3) = (x"E" & '0') else -- E 384 - x"70" when data(7 downto 3) = (x"F" & '0') else -- F 368 - x"58" when data(7 downto 3) = (x"F" & '1') else -- F# 344 - x"40" when data(7 downto 3) = (x"8" & '0') else -- G 320 - x"30" when data(7 downto 3) = (x"8" & '1') else -- G# 304 - x"20" when data(7 downto 3) = (x"A" & '0') else -- A 288 - x"10" when data(7 downto 3) = (x"A" & '1') else -- A# 272 - x"00" when data(7 downto 3) = (x"B" & '0') else -- B 256 - x"01"; + buff <= + x"1F0" when data(6 downto 3) = (x"1") else -- C 496 + x"1D0" when data(6 downto 3) = (x"2") else -- C#/Db 464 + x"1B0" when data(6 downto 3) = (x"3") else -- D 432 + x"1A0" when data(6 downto 3) = (x"4") else -- D#/Eb 416 + x"180" when data(6 downto 3) = (x"5") else -- E 384 + x"170" when data(6 downto 3) = (x"6") else -- F 368 + x"158" when data(6 downto 3) = (x"7") else -- F#/Gb 344 + x"140" when data(6 downto 3) = (x"8") else -- G 320 + x"130" when data(6 downto 3) = (x"9") else -- G#/Ab 304 + x"120" when data(6 downto 3) = (x"A") else -- A 288 + x"110" when data(6 downto 3) = (x"B") else -- A#/Bb 272 + x"100" when data(6 downto 3) = (x"C") else -- B 256 + x"000"; - buff <= x"1" & buffSmall; - freq <= (others => '0') & buff(15 downto shift); -- bitshift values out (or div by powers of 2) + -- buff <= x"1" & buffSmall; + freq <= std_logic_vector( shift_right(unsigned(buff), shift) ); + -- freq <= (others => '0') & buff(11 downto shift); -- bitshift values out (or div by powers of 2) -- TODO: NO WORKY!!! (concat (others => '0');) end architecture;
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