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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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LIBRARY std;
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USE std.textio.ALL;
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ENTITY spw_sender IS
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GENERIC(
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FNAME : STRING := "input.txt"
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);
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PORT(
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end_of_simu : OUT STD_LOGIC;
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start_of_simu : IN STD_LOGIC;
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clk : IN STD_LOGIC;
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txwrite : OUT STD_LOGIC;
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txflag : OUT STD_LOGIC;
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txdata : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);
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txrdy : IN STD_LOGIC;
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txhalff : IN STD_LOGIC
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);
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END spw_sender;
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ARCHITECTURE beh OF spw_sender IS
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FILE input_file : TEXT OPEN read_mode IS FNAME;
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BEGIN
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-----------------------------------------------------------------------------
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-- Data orginization in the input file :
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-----------------------------------------------------------------------------
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-- Exemple of input.txt file :
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-- Time1 N1
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-- Data_1
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-- Data_2
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-- ...
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-- Data_N1
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-- Time2 N2
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-- Data_1
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-- Data_2
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-- ...
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-- Data_N2
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-- ...
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-- TimeK NK
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-- Data_1
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-- Data_2
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-- ...
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-- Data_NK
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-----------------------------------------------------------------------------
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-- Time : integer. Waiting time (in ns) before to send the following message
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-- N : integer. Length (in Byte) of the following message.
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-- Data : integer(0 to 255). A part of the message.
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-----------------------------------------------------------------------------
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PROCESS IS
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VARIABLE line_var : LINE;
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VARIABLE waiting_time : INTEGER;
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VARIABLE length_of_message : INTEGER;
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VARIABLE value : INTEGER;
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BEGIN -- PROCESS
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txwrite <= '0';
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txflag <= '0';
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WAIT UNTIL clk = '1';
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IF start_of_simu = '1' THEN
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IF endfile(input_file) THEN
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end_of_simu <= '1';
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ELSE
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end_of_simu <= '0';
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readline(input_file, line_var);
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read(line_var, waiting_time);
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read(line_var, length_of_message);
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WAIT FOR waiting_time * 1 ns;
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FOR char_number IN 0 TO length_of_message-1 LOOP
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WAIT UNTIL clk = '1' AND txrdy = '1';
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readline(input_file, line_var);
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read(line_var, value);
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txwrite <= '1';
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txflag <= '0';
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txdata <= STD_LOGIC_VECTOR(to_unsigned(value, txdata'LENGTH));
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END LOOP; -- char_number
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WAIT UNTIL clk = '1' AND txrdy = '1';
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txwrite <= '1';
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txflag <= '1';
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txdata <= (OTHERS => '0');
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WAIT UNTIL clk = '1';
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txwrite <= '0';
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txflag <= '0';
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END IF;
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END IF;
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END PROCESS;
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END beh;
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