FPGA通过WiFi模块实现与电脑的无线通信 代码

以下是一个基本的FPGA与电脑之间通过WiFi模块实现无线通信的代码示例。这里以使用Digilent Pmod WiFi模块的Xilinx Spartan 6 FPGA为例，但是这个例子也可以适用于其他WiFi模块和FPGA平台。

1. 首先，我们需要使用VHDL编写FPGA的代码。以下是一个简单的VHDL例子，它使用Digilent Pmod WiFi模块与电脑进行通信：

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

entity wifi_communication is
    Port ( clock : in STD_LOGIC;
           reset : in STD_LOGIC;
           tx_data : in STD_LOGIC_VECTOR (7 downto 0);
           rx_data : out STD_LOGIC_VECTOR (7 downto 0);
           tx_en : in STD_LOGIC;
           rx_en : in STD_LOGIC;
           tx_done : out STD_LOGIC;
           rx_done : out STD_LOGIC;
           wifi_rx : in STD_LOGIC;
           wifi_tx : out STD_LOGIC;
           wifi_rts : out STD_LOGIC;
           wifi_cts : in STD_LOGIC);
end wifi_communication;

architecture Behavioral of wifi_communication is
    signal tx_state : integer range 0 to 2 := 0;
    signal tx_data_reg : std_logic_vector(7 downto 0);
    signal tx_counter : integer range 0 to 7 := 0;

    signal rx_state : integer range 0 to 2 := 0;
    signal rx_data_reg : std_logic_vector(7 downto 0);
    signal rx_counter : integer range 0 to 7 := 0;

    signal wifi_rx_reg : std_logic_vector(7 downto 0);
    signal wifi_tx_reg : std_logic_vector(7 downto 0);
    signal wifi_rts_reg : std_logic := '0';
    signal wifi_cts_reg : std_logic := '0';

begin

    tx_done <= '1' when (tx_state = 0) else '0';
    rx_done <= '1' when (rx_state = 0) else '0';

    process(clock, reset)
    begin
        if reset = '1' then
            tx_state <= 0;
            tx_data_reg <= (others => '0');
            tx_counter <= 0;

            rx_state <= 0;
            rx_data_reg <= (others => '0');
            rx_counter <= 0;

            wifi_rx_reg <= (others => '0');
            wifi_tx_reg <= (others => '0');
            wifi_rts_reg <= '0';
            wifi_cts_reg <= '0';

        elsif rising_edge(clock) then
            -- Transmit state machine
            case tx_state is
                when 0 =>
                    if tx_en = '1' then
                        tx_state <= 1;
                        tx_data_reg <= tx_data;
                    end if;
                when 1 =>
                    wifi_rts_reg <= '1';

                    if wifi_cts = '1' then
                        tx_state <= 2;
                        wifi_tx_reg <= tx_data_reg;
                    end if;
                when 2 =>
                    wifi_rts_reg <= '0';

                    if wifi_cts = '1' then
                        tx_counter <= tx_counter + 1;

                        if tx_counter = 7 then
                            tx_state <= 0;
                        else
                            tx_data_reg <= tx_data_reg(6 downto 0) & '0';
                        end if;
                    end if;
            end case;

            -- Receive state machine
            case rx_state is
                when 0 =>
                    if rx_en = '1' and wifi_rx = '1' then
                        rx_state <= 1;
                    end if;
                when 1 =>
                    wifi_rts_reg <= '1';

                    if wifi_cts = '1' then
                        rx_state <= 2;
                        wifi_rts_reg <= '0';
                    end if;
                when 2 =>
                    wifi_rts_reg <= '0';

                    if wifi_rx = '1' then
                        rx_counter <= rx_counter + 1;

                        if rx_counter = 7 then
                            rx_state <= 0;
                            rx_data_reg <= wifi_rx_reg;
                        else
                            wifi_rx_reg <= wifi_rx_reg(6 downto 0) & '0';
                        end if;
                    end if;
            end case;

            wifi_tx <= wifi_tx_reg;
            wifi_rts <= wifi_rts_reg;
            rx_data <= rx_data_reg;
        end if;
    end process;
end Behavioral;

2. 接下来，我们需要使用C或者Python编写电脑端的代码，以与FPGA通信。以下是一个简单的Python例子，它使用Python的socket库与FPGA进行通信：

import socket

HOST = '192.168.1.100'  # FPGA的IP地址
PORT = 5000  # 与FPGA通信的端口号

while True:
    try:
        # 创建一个TCP/IP套接字
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        # 连接FPGA
        sock.connect((HOST, PORT))
        # 发送数据到FPGA
        sock.sendall(b'Hello, FPGA!')
        # 接收来自FPGA的响应
        data = sock.recv(1024)
        print('Received:', data)
        # 关闭套接字
        sock.close()
    except Exception as e:
        print(e)

请注意，这只是一个简单的例子。实际的代码可能需要更复杂的错误处理和数据处理。此外，还需要确保FPGA和电脑都连接到同一个WiFi网络，并且FPGA的IP地址正确设置。