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LIBRARY ieee;
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USE ieee.std_logic_1164.ALL;
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USE IEEE.MATH_REAL.ALL;
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USE ieee.numeric_std.ALL;
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LIBRARY std;
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use std.textio.all;
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ENTITY data_read IS
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GENERIC (
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input_file_name : STRING := "input_data_2.txt";
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NB_CHAR_PER_DATA : INTEGER := 4
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);
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PORT (
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clk : IN STD_LOGIC;
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read_new_data : IN STD_LOGIC;
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end_of_file : OUT STD_LOGIC;
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data_out_val : OUT STD_LOGIC;
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data_out : OUT STD_LOGIC_VECTOR(NB_CHAR_PER_DATA * 4 - 1 DOWNTO 0)
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);
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END;
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ARCHITECTURE beh OF data_read IS
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BEGIN -- beh
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PROCESS
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FILE file_pointer : TEXT;
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VARIABLE line_read : LINE;
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VARIABLE line_content : STRING(1 TO NB_CHAR_PER_DATA);
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VARIABLE char_read : CHARACTER;
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VARIABLE data_read : STD_LOGIC_VECTOR(NB_CHAR_PER_DATA * 4 - 1 DOWNTO 0);
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VARIABLE signal_part : STD_LOGIC_VECTOR(3 DOWNTO 0);
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BEGIN -- PROCESS
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end_of_file <= '0';
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data_out_val <= '0';
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data_out <= (OTHERS => '0');
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WAIT UNTIL clk = '1';
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file_open(file_pointer,input_file_name,READ_MODE);
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WHILE NOT endfile(file_pointer) LOOP
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readline(file_pointer, line_read);
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read(line_read,line_content);
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FOR i IN 1 TO NB_CHAR_PER_DATA LOOP
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char_read := line_content(NB_CHAR_PER_DATA+1-i);
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CASE char_read IS
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WHEN '0' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0000";
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WHEN '1' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0001";
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WHEN '2' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0010";
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WHEN '3' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0011";
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WHEN '4' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0100";
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WHEN '5' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0101";
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WHEN '6' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0110";
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WHEN '7' => data_read(4*i-1 DOWNTO 4*(i-1)) := "0111";
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WHEN '8' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1000";
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WHEN '9' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1001";
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WHEN 'a' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1010";
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WHEN 'b' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1011";
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WHEN 'c' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1100";
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WHEN 'd' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1101";
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WHEN 'e' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1110";
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WHEN 'f' => data_read(4*i-1 DOWNTO 4*(i-1)) := "1111";
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WHEN OTHERS => NULL;
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END CASE;
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END LOOP;
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WAIT UNTIL read_new_data = '1';
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WAIT UNTIL clk = '1';
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data_out <= data_read;
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data_out_val <= '1';
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WAIT UNTIL clk = '1';
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data_out_val <= '0';
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END LOOP;
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file_close(file_pointer);
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end_of_file <= '1';
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data_out_val <= '0';
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WAIT;
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END PROCESS;
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END beh;
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