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--! Test serial_transmitter module

LIBRARY ieee;

USE ieee.std_logic_1164.ALL;

--! Use CPU Definitions package

use work.pkgDefinitions.all;

ENTITY testSerial_transmitter IS

END testSerial_transmitter;

ARCHITECTURE behavior OF testSerial_transmitter IS

    -- Component Declaration for the Unit Under Test (UUT)

    COMPONENT serial_transmitter

    PORT(

         rst : IN  std_logic;

         baudClk : IN  std_logic;

         data_byte : IN  std_logic_vector(7 downto 0);

         data_sent : OUT  std_logic;

         serial_out : OUT  std_logic

        );

    END COMPONENT;

   --Inputs

   signal rst : std_logic := '0';

   signal baudClk : std_logic := '0';

   signal data_byte : std_logic_vector(7 downto 0) := (others => '0');

        --Outputs

   signal data_sent : std_logic;

   signal serial_out : std_logic;

   -- Clock period definitions

   constant baudClk_period : time := 10 ns;

BEGIN

        -- Instantiate the Unit Under Test (UUT)

   uut: serial_transmitter PORT MAP (

          rst => rst,

          baudClk => baudClk,

          data_byte => data_byte,

          data_sent => data_sent,

          serial_out => serial_out

        );

   -- Clock process definitions

   baudClk_process :process

   begin

                baudClk <= '0';

                wait for baudClk_period/2;

                baudClk <= '1';

                wait for baudClk_period/2;

   end process;

   -- Stimulus process

   stim_proc: process

   begin

      -- Prepare the data to be sent 0x55

                rst <= '1';

                data_byte <= "01010101";

      wait for 50 ns;

                rst <= '0';

      wait until data_sent = '1';

                wait for baudClk_period*3;

                -- Prepare the data to be sent

                rst <= '1';

                data_byte <= "11000100";

      wait for 50 ns;

                rst <= '0';

      wait until data_sent = '1';

                wait for baudClk_period*3;

      -- insert stimulus here 

      wait;

   end process;

END;