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--! Test serial_receiver module

LIBRARY ieee;

USE ieee.std_logic_1164.ALL;

--! Use CPU Definitions package

use work.pkgDefinitions.all;

ENTITY testSerial_receiver IS

END testSerial_receiver;

ARCHITECTURE behavior OF testSerial_receiver IS

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

    COMPONENT serial_receiver

    PORT(

         rst : IN  std_logic;

         baudClk : IN  std_logic;

         baudOverSampleClk : IN  std_logic;

         serial_in : IN  std_logic;

         data_ready : OUT  std_logic;

         data_byte : OUT  std_logic_vector((nBits-1) downto 0)

        );

    END COMPONENT;

   --Inputs

   signal rst : std_logic := '0';

   signal baudClk : std_logic := '0';

   signal baudOverSampleClk : std_logic := '0';

   signal serial_in : std_logic := '0';

        --Outputs

   signal data_ready : std_logic;

   signal data_byte : std_logic_vector((nBits-1) downto 0);

   -- Clock period definitions

   constant baudClk_period : time := 8.6805 us;

   constant baudOverSampleClk_period : time := 1 us;

BEGIN

        -- Instantiate the Unit Under Test (UUT)

   uut: serial_receiver PORT MAP (

          rst => rst,

          baudClk => baudClk,

          baudOverSampleClk => baudOverSampleClk,

          serial_in => serial_in,

          data_ready => data_ready,

          data_byte => data_byte

        );

   -- Clock process definitions

   baudClk_process :process

   begin

                baudClk <= '0';

                wait for baudClk_period/2;

                baudClk <= '1';

                wait for baudClk_period/2;

   end process;

   baudOverSampleClk_process :process

   begin

                baudOverSampleClk <= '0';

                wait for baudOverSampleClk_period/2;

                baudOverSampleClk <= '1';

                wait for baudOverSampleClk_period/2;

   end process;

   -- Stimulus process

   stim_proc: process

   begin

      rst <= '1';

                serial_in <= '1';       -- Idle

      wait for 3 us;

                rst <= '0';

                wait for baudClk_period * 3;

                -- Receive 0xC4 value (11000100)

                -- Start bit here

                serial_in <= '0';

                wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '1';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '1';

      wait for baudClk_period;

                serial_in <= '1';

      wait for baudClk_period;

                -- Stop bit here

                serial_in <= '1';

                wait for baudClk_period * 1;

                -- Receive 0x55 value (01010101)

                -- Start bit here

                serial_in <= '0';

                wait for baudClk_period;

                serial_in <= '1';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '1';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '1';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                serial_in <= '1';

      wait for baudClk_period;

                serial_in <= '0';

      wait for baudClk_period;

                -- Stop bit here

                serial_in <= '1';

                wait for baudClk_period * 1;

      -- Stop Simulation

                assert false report "NONE. End of simulation." severity failure;

      wait;

   end process;

END;