VHDLとシリアル通信の完璧ガイド10選

entity UART_Init is
  port(
    clk  : in  std_logic;
    reset: in  std_logic;
    -- その他の入出力ポート
  );
end UART_Init;

architecture Behavioral of UART_Init is
  -- パラメータやシグナルの宣言
begin
  -- 初期設定処理
end Behavioral;

entity UART_Transmit is
  port(
    clk     : in  std_logic;
    data_in : in  std_logic_vector(7 downto 0);
    send_req: in  std_logic;
    tx      : out std_logic
    -- その他の入出力ポート
  );
end UART_Transmit;

architecture Behavioral of UART_Transmit is
  -- パラメータやシグナルの宣言
begin
  -- データ送信処理
end Behavioral;

entity UART_Receive is
  port(
    clk       : in  std_logic;
    rx        : in  std_logic;
    data_out  : out std_logic_vector(7 downto 0);
    received  : out std_logic
    -- その他の入出力ポート
  );
end UART_Receive;

architecture Behavioral of UART_Receive is
  -- パラメータやシグナルの宣言
begin
  -- データ受信処理
end Behavioral;

-- シリアル通信モジュールの宣言
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity serial_comm is
    Port ( clk : in STD_LOGIC;
           data_in : in STD_LOGIC_VECTOR(7 downto 0);
           send : in STD_LOGIC;
           data_out : out STD_LOGIC_VECTOR(7 downto 0);
           receive : out STD_LOGIC);
end serial_comm;

architecture Behavioral of serial_comm is
    signal count : STD_LOGIC_VECTOR(3 downto 0) := "0000";
    signal temp_data : STD_LOGIC_VECTOR(7 downto 0);
begin
    process(clk)
    begin
        if rising_edge(clk) then
            if send = '1' then
                temp_data <= data_in;
                data_out <= temp_data;
                receive <= '1';
            else
                count <= count + 1;
                temp_data <= temp_data sll 1;
                data_out <= temp_data;
                receive <= '0';
            end if;
        end if;
    end process;
end Behavioral;

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity ErrorDetection is
    Port ( clk : in STD_LOGIC;
           reset : in STD_LOGIC;
           data_in : in STD_LOGIC_VECTOR(7 downto 0);
           send_req : in STD_LOGIC;
           data_out : out STD_LOGIC_VECTOR(7 downto 0);
           resend : out STD_LOGIC;
           crc_error : out STD_LOGIC);
end ErrorDetection;

architecture Behavioral of ErrorDetection is
    signal crc_check : STD_LOGIC_VECTOR(15 downto 0);
    signal crc_sent : STD_LOGIC_VECTOR(15 downto 0);
begin
    process(clk, reset)
    begin
        if reset = '1' then
            -- 初期化処理
            data_out <= "00000000";
            resend <= '0';
            crc_error <= '0';
        elsif rising_edge(clk) then
            -- CRC計算処理
            crc_sent <= some_crc_calculation_function(data_in);
            if crc_check /= crc_sent then
                crc_error <= '1';
                resend <= '1';
            else
                crc_error <= '0';
                resend <= '0';
                data_out <= data_in;
            end if;
        end if;
    end process;
end Behavioral;

-- シリアル通信用のライブラリをインクルード
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;

-- シリアル通信の設定
entity SerialConfig is
    Port ( clk : in std_logic;
           data_in : in std_logic_vector(7 downto 0);
           data_out : out std_logic_vector(7 downto 0);
           baud_rate : in std_logic_vector(3 downto 0)); -- ボーレート設定用
end SerialConfig;

architecture Behavior of SerialConfig is
    signal internal_baud_rate : std_logic_vector(3 downto 0);
begin
    -- ボーレートの設定
    process(clk)
    begin
        if rising_edge(clk) then
            internal_baud_rate <= baud_rate;
        end if;
    end process;

    -- その他のシリアル通信設定（データ転送など）
    -- (省略)

end Behavior;

-- (省略：シリアル通信の基本設定など)

-- 送信側のコード
process(clk)
begin
    if rising_edge(clk) then
        if send_trigger = '1' then
            -- 一定のパターンのデータを送信
            data_out <= "10101010";
        end if;
    end process;

-- 受信側のコード
process(clk)
begin
    if rising_edge(clk) then
        if received_data = "10101010" then
            -- データの整合性が確認できた場合
            data_status <= "good";
        else
            -- データの整合性が確認できなかった場合
            data_status <= "bad";
        end if;
    end process;

-- (省略：シリアル通信の基本設定など)

-- 送信側のコード
process(clk)
begin
    if rising_edge(clk) then
        if send_trigger = '1' then
            -- カスタムヘッダの送信
            data_out <= "1100";
            wait for 10 ns;
            -- データの送信
            data_out <= custom_data;
            wait for 10 ns;
            -- カスタムフッタの送信
            data_out <= "0011";
        end if;
    end process;

-- 受信側のコード
process(clk)
begin
    if rising_edge(clk) then
        if received_data(3 downto 0) = "1100" then
            -- ヘッダの検出
            header_detected <= '1';
        elsif header_detected = '1' and received_data(3 downto 0) = "0011" then
            -- フッタの検出
            footer_detected <= '1';
        elsif header_detected = '1' and footer_detected = '0' then
            -- データの受信
            received_custom_data <= received_data;
        end if;


 end process;

-- (省略：シリアル通信の基本設定など)

-- 通信速度の設定
constant BAUD_RATE : integer := 9600;

-- 送信側のコード
process(clk)
begin
    if rising_edge(clk) then
        if send_trigger = '1' then
            -- データの送信
            data_out <= external_data;
        end if;
    end process;

-- 受信側のコード
process(clk)
begin
    if rising_edge(clk) then
        -- データの受信
        received_external_data <= received_data;
    end process;