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-- Entity: DisplayDriverWrapper
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-- Entity: display_driver_wrapper
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-- Date:2017-01-06
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-- Date:2017-01-06
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-- Author: GL
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-- Author: GL
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--
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--
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-- Description:
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-- Description:
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use ieee.numeric_std.all;
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use ieee.numeric_std.all;
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--! @file
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--! @file
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--! @brief Top wrapper for design FPGA prove.
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--! @brief Top wrapper for design FPGA prove.
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--! @details This wrapper is designed for Lattice ECP5-5G Versa Development Kit.
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--! @details This wrapper is designed for Lattice ECP5-5G Versa Development Kit.
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entity DisplayDriverWrapper is
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entity display_driver_wrapper is
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port (
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port (
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clk : in std_logic; --! input clock, xx MHz.
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clk : in std_logic; --! input clock, xx MHz.
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n_rst : in std_logic; --! active low on board. active high in design.
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n_rst : in std_logic; --! active low on board. active high in design.
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button : in std_logic; --! dev board tact switch to scroll through some test symbols, active low
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button : in std_logic; --! dev board tact switch to scroll through some test symbols, active low
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--! Typically the data fed to display (single or multiple) is provided for single display at a time.
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--! Typically the data fed to display (single or multiple) is provided for single display at a time.
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--! If multiple displays are required together with data goes display select (according typical dynamic display indication).
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--! If multiple displays are required together with data goes display select (according typical dynamic display indication).
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disp_data : out std_logic_vector(14 downto 0);
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disp_data_q : out std_logic_vector(14 downto 0)
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--! If more displays needs to be fed change disp_sel to vector with length equal to number of displays.
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--! Use principles of the standard dynamic indication: provide data then enable the displays sequentially.
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--! If brightness control is desired just AND the selector and the PWM controller output.
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disp_sel : out std_logic
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);
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);
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attribute syn_force_pad: boolean;
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attribute syn_force_pad: boolean;
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attribute syn_force_pad of clk, n_rst, button, disp_sel, disp_data: signal is true;
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attribute syn_force_pad of clk, n_rst, button, disp_data_q: signal is true;
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end DisplayDriverWrapper;
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end display_driver_wrapper;
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--! @details The architecture consists of the DisplayDriverwDecoder_Top itself (as DUT) plus
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--! @details The architecture consists of the display_driver_w_decoder itself (as DUT) plus
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--! sample symbol generator triggered by the button on the dev board
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--! sample symbol generator triggered by the button on the dev board
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architecture arch of DisplayDriverWrapper is
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architecture arch of display_driver_wrapper is
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signal rst: std_logic;
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signal rst: std_logic;
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--! Debounce the glitches shorter than 4 clock cycles. Expand at will according the clock speed and glitch duration to filter.
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--! Debounce the glitches shorter than 4 clock cycles. Expand at will according the clock speed and glitch duration to filter.
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signal bttn_state_fifo: unsigned(3 downto 0);
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signal bttn_state_fifo: unsigned(3 downto 0);
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begin
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begin
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--! invert n_rst to make it active high on design recommendation
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--! invert n_rst to make it active high on design recommendation
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rst <= not n_rst;
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rst <= not n_rst;
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BtnDebouncer:process(clk)
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button_debouncer: process(clk)
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begin
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begin
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if rising_edge(clk) then
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if rising_edge(clk) then
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if rst = '1' then
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if rst = '1' then
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bttn_state_fifo <= (others=>'1'); -- active low
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bttn_state_fifo <= (others=>'1'); -- active low
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bttn_state <= '0'; -- active high
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bttn_state <= '0'; -- active high
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else
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else
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bttn_state <= '0';
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bttn_state <= '0';
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end if;
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end if;
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end if;
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end if;
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end if;
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end if;
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end process;
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end process; -- button_debouncer
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AddrScanCntr:process(rst,bttn_state)
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--! @brief User control counter to emulate ASCII codes input
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--! @details Counter that goes through values from 0x00 to 0xFF in steps of 0x01 and then rolls naturally to 0x00.
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--! With the counter output hex ASCII codes are emulated. The counter is incremented by clicking SW3 on ECP5-5G Versa Board.
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address_scan_counter: process(rst,bttn_state)
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begin
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begin
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if rst='1' then
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if rst='1' then
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symbol_scan_cntr <= (others=>'0');
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symbol_scan_cntr <= (others=>'0');
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elsif rising_edge(bttn_state) then -- TODO: Fix this to edge detector implementation
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elsif rising_edge(bttn_state) then -- TODO: Fix this to edge detector implementation
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symbol_scan_cntr <= symbol_scan_cntr + 1; -- I count ont the natural rolloff of this counter
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symbol_scan_cntr <= symbol_scan_cntr + 1; -- I count ont the natural rolloff of this counter
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end if;
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end if;
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end process;
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end process; -- address_scan_counter
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DDwD_Top:entity work.DisplayDriverwDecoder_Top
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display_driver_with_decoder: entity work.display_driver_w_decoder
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port map(
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port map(
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clk => clk,
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clk => clk,
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reset => rst,
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reset => rst,
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ascii_in => std_logic_vector(symbol_scan_cntr),
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ascii_in => std_logic_vector(symbol_scan_cntr),
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wr_en => '0',
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wr_en => '0',
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disp_data => disp_data,
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disp_data_q => disp_data_q
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disp_sel => disp_sel
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);
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);
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--disp_sel <= '1' when button = '1';
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end arch;
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end arch;
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