FPGA通过ESP8266实现与电脑的无线通信 代码

以下是FPGA通过ESP8266实现与电脑的无线通信的代码，其中包括了FPGA的Verilog代码和ESP8266的AT指令代码。

Verilog代码：

module wireless_communication(
    input clk,
    input rst_n,
    input [7:0] data_in,
    output [7:0] data_out,
    input tx_en,
    output tx_done,
    input rx_en,
    input [7:0] rx_data
);

// ESP8266串口通信的波特率为115200
parameter BAUD_RATE = 115200; 

// 计算时钟分频系数
parameter DIV = 50000000 / BAUD_RATE;

reg [31:0] counter;
reg [7:0] tx_data;
reg [7:0] rx_buffer;
reg [3:0] rx_state;
reg [3:0] tx_state;

wire rx_ready = (rx_state == 4);
wire tx_ready = (tx_state == 4);

// 计数器模块
always @(posedge clk or negedge rst_n)
begin
    if (!rst_n)
        counter <= 0;
    else
        counter <= counter + 1;
end

// 发送模块
always @(posedge clk or negedge rst_n)
begin
    if (!rst_n) begin
        tx_state <= 0;
        tx_data <= 0;
    end
    else begin
        case (tx_state)
            0: begin // 空闲状态
                if (tx_en) begin
                    tx_state <= 1;
                    tx_data <= data_in;
                end
            end
            1: begin // 发送状态
                if (counter >= DIV) begin
                    tx_state <= 2;
                    tx_data <= tx_data << 1;
                    counter <= 0;
                end
            end
            2: begin // 发送状态
                if (counter >= DIV) begin
                    tx_state <= 3;
                    tx_data <= {1'b1, data_in};
                    counter <= 0;
                end
            end
            3: begin // 发送状态
                if (counter >= DIV) begin
                    tx_state <= 4;
                    tx_data <= 0;
                    counter <= 0;
                end
            end
            4: begin // 发送完成状态
                tx_done <= 1;
                if (!tx_en)
                    tx_state <= 0;
            end
        endcase
    end
end

// 接收模块
always @(posedge clk or negedge rst_n)
begin
    if (!rst_n) begin
        rx_state <= 0;
        rx_buffer <= 0;
    end
    else begin
        case (rx_state)
            0: begin // 空闲状态
                if (rx_en)
                    rx_state <= 1;
            end
            1: begin // 接收状态
                if (counter >= DIV) begin
                    rx_state <= 2;
                    rx_buffer <= rx_data;
                    counter <= 0;
                end
            end
            2: begin // 接收状态
                if (counter >= DIV) begin
                    rx_state <= 3;
                    rx_buffer <= {rx_buffer, rx_data};
                    counter <= 0;
                end
            end
            3: begin // 接收状态
                if (counter >= DIV) begin
                    rx_state <= 4;
                    counter <= 0;
                end
            end
            4: begin // 接收完成状态
                if (rx_en)
                    rx_state <= 1;
                else
                    rx_state <= 0;
            end
        endcase
    end
end

// 串口发送模块
always @(posedge clk or negedge rst_n)
begin
    if (!rst_n) begin
        tx_state <= 0;
        tx_data <= 0;
    end
    else begin
        case (tx_state)
            0: begin // 空闲状态
                if (tx_en) begin
                    tx_state <= 1;
                    tx_data <= data_in;
                end
            end
            1: begin // 发送状态
                if (counter >= DIV) begin
                    tx_state <= 2;
                    tx_data <= tx_data << 1;
                    counter <= 0;
                end
            end
            2: begin // 发送状态
                if (counter >= DIV) begin
                    tx_state <= 3;
                    tx_data <= {1'b1, data_in};
                    counter <= 0;
                end
            end
            3: begin // 发送状态
                if (counter >= DIV) begin
                    tx_state <= 4;
                    tx_data <= 0;
                    counter <= 0;
                end
            end
            4: begin // 发送完成状态
                tx_done <= 1;
                if (!tx_en)
                    tx_state <= 0;
            end
        endcase
    end
end

// 串口接收模块
always @(posedge clk or negedge rst_n)
begin
    if (!rst_n) begin
        rx_state <= 0;
        rx_buffer <= 0;
    end
    else begin
        case (rx_state)
            0: begin // 空闲状态
                if (rx_en)
                    rx_state <= 1;
            end
            1: begin // 接收状态
                if (counter >= DIV) begin
                    rx_state <= 2;
                    rx_buffer <= rx_data;
                    counter <= 0;
                end
            end
            2: begin // 接收状态
                if (counter >= DIV) begin
                    rx_state <= 3;
                    rx_buffer <= {rx_buffer, rx_data};
                    counter <= 0;
                end
            end
            3: begin // 接收状态
                if (counter >= DIV) begin
                    rx_state <= 4;
                    counter <= 0;
                end
            end
            4: begin // 接收完成状态
                if (rx_en)
                    rx_state <= 1;
                else
                    rx_state <= 0;
            end
        endcase
    end
end

// 数据输出
assign data_out = rx_buffer[7:0];

endmodule

ESP8266的AT指令代码：

#include <SoftwareSerial.h>

SoftwareSerial espSerial(2, 3); // ESP8266连接的串口

void setup() {
  Serial.begin(115200);
  espSerial.begin(115200);
  delay(1000);
  Serial.println("ESP8266 AT Test");
  if (sendATCommand("AT\r\n", "OK")) {
    Serial.println("ESP8266 is ready");
  } else {
    Serial.println("ESP8266 is not responding");
  }
}

void loop() {
  if (sendATCommand("AT+CIPSTATUS\r\n", "STATUS:3")) { // 检查连接状态
    Serial.println("Connected");
    if (sendATCommand("AT+CIPSEND=1\r\n", ">")) { // 准备发送数据
      Serial.println("Ready to send data");
      espSerial.write(Serial.read()); // 发送数据
    }
  } else {
    Serial.println("Not connected");
  }
}

boolean sendATCommand(String command, String expected) {
  espSerial.print(command);
  delay(1000);
  while (espSerial.available()) {
    if (espSerial.find(expected)) {
      return true;
    }
  }
  return false;
}

需要注意的是，在使用ESP8266进行无线通信前，需要先将ESP8266连接到Wi-Fi网络。对于连接Wi-Fi网络的操作，可以使用ESP8266的AT指令进行设置。