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https://opencores.org/ocsvn/keyboardcontroller/keyboardcontroller/trunk
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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use ieee.std_logic_arith.sxt;
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use work.Constants.all;
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entity Producer is
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port (reset, clk: in std_logic;
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produce : in std_logic;
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released : in std_logic;
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conv_col : in col_number;
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conv_row : in row_number;
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scanc : out scancode;
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interrupt : out std_logic
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);
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end Producer;
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architecture Producer_arc of Producer is
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signal next_scanc: std_logic_vector(scancode_width-1 downto 0);
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begin
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process(released, conv_row, conv_col)
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variable index: natural range 0 to 93;
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variable tmp : std_logic_vector(6 downto 0);
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begin
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--make address out of col and row number of the pressed/released key
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tmp := std_logic_vector(to_unsigned(conv_row,4)) & std_logic_vector(to_unsigned(conv_col,3));
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index := to_integer(unsigned(tmp));
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--look-up scancode
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next_scanc <= set1_scancodes_lut(index);
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if (released='1') then
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next_scanc(scancode_width-1)<='1'; --add 0x80 for keyrelease scancode
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end if;
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end process;
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--put values in registers on next rising edge
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process
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begin
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wait until rising_edge(clk);
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if (reset='1') then
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scanc <= "00000000";
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interrupt <= '0';
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elsif(produce = '1') then
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scanc <= next_scanc;
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interrupt <= '1';
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else
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interrupt <= '0';
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end if;
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end process;
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end Producer_arc;
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