verilog写一个二维码识别模块用于门禁卡

以下是一个简单的Verilog代码，用于二维码识别模块的门禁卡。该代码使用基于比较器的方法进行图像识别。

module qrcode_reader(
    input clk,
    input reset,
    input [7:0] pixel_in, // 输入像素值
    input valid_in, // 输入数据有效标志
    output reg valid_out, // 输出数据有效标志
    output [7:0] data_out // 输出二维码数据
);

// 常量定义
parameter WIDTH = 64; // 图像宽度
parameter HEIGHT = 64; // 图像高度
parameter QR_SIZE = 32; // 二维码大小
parameter QR_MARGIN = 2; // 二维码边缘空白
parameter QR_MIN = 128; // 二维码黑色像素阈值
parameter QR_MAX = 256; // 二维码白色像素阈值

// 内部变量定义
reg [7:0] pixel_buf [0:HEIGHT-1][0:WIDTH-1]; // 像素缓存
reg [QR_SIZE-1:0][QR_SIZE-1:0] qr_buf; // 二维码缓存
integer row, col, qr_row, qr_col; // 计数器
integer qr_start_row, qr_start_col; // 二维码起始位置
integer qr_end_row, qr_end_col; // 二维码结束位置
integer qr_row_count, qr_col_count; // 二维码行列计数器
integer qr_data_count; // 二维码数据计数器
integer qr_data; // 二维码数据缓存
integer qr_state; // 二维码状态机
integer qr_state_count; // 二维码状态计数器

// 初始化
initial begin
    valid_out = 0;
    qr_data_out = 0;
end

// 时钟上升沿处理
always @(posedge clk) begin
    // 复位处理
    if (reset) begin
        valid_out <= 0;
        qr_data_out <= 0;
        qr_state <= 0;
        qr_data_count <= 0;
        qr_row_count <= 0;
        qr_col_count <= 0;
        qr_state_count <= 0;
        for (row = 0; row < HEIGHT; row = row + 1) begin
            for (col = 0; col < WIDTH; col = col + 1) begin
                pixel_buf[row][col] <= 0;
            end
        end
        for (qr_row = 0; qr_row < QR_SIZE; qr_row = qr_row + 1) begin
            for (qr_col = 0; qr_col < QR_SIZE; qr_col = qr_col + 1) begin
                qr_buf[qr_row][qr_col] <= 0;
            end
        end
    end
    // 数据处理
    else if (valid_in) begin
        pixel_buf[qr_row_count][qr_col_count] <= pixel_in;
        if (qr_row_count >= HEIGHT - 1) begin
            qr_row_count <= 0;
            qr_col_count <= qr_col_count + 1;
        end
        else begin
            qr_row_count <= qr_row_count + 1;
        end
        // 二维码识别
        if (qr_col_count >= QR_SIZE + QR_MARGIN * 2 and qr_row_count >= QR_SIZE + QR_MARGIN * 2) begin
            qr_start_row = 0;
            qr_start_col = 0;
            qr_end_row = QR_SIZE - 1;
            qr_end_col = QR_SIZE - 1;
            qr_row_count = QR_MARGIN;
            qr_col_count = QR_MARGIN;
            for (qr_row = 0; qr_row < QR_SIZE; qr_row = qr_row + 1) begin
                for (qr_col = 0; qr_col < QR_SIZE; qr_col = qr_col + 1) begin
                    qr_buf[qr_row][qr_col] <= 0;
                end
            end
            for (row = qr_start_row; row <= qr_end_row; row = row + 1) begin
                for (col = qr_start_col; col <= qr_end_col; col = col + 1) begin
                    if (pixel_buf[row][col] >= QR_MIN and pixel_buf[row][col] <= QR_MAX) begin
                        qr_buf[row - qr_start_row][col - qr_start_col] <= 1;
                    end
                end
            end
            qr_state <= 0;
            qr_state_count <= 0;
            qr_data_count <= 0;
        end
        // 二维码状态机
        if (qr_state == 0) begin // 同步码
            if (qr_buf[qr_state_count][qr_col_count - QR_MARGIN] == 0) begin
                qr_state_count <= qr_state_count + 1;
                if (qr_state_count >= 7) begin
                    qr_state <= 1;
                    qr_state_count <= 0;
                end
            end
            else begin
                qr_state_count <= 0;
            end
        end
        else if (qr_state == 1) begin // 数据码
            if (qr_buf[qr_state_count][qr_col_count - QR_MARGIN] == 0) begin
                qr_state_count <= qr_state_count + 1;
                if (qr_state_count >= 4) begin
                    qr_state <= 2;
                    qr_state_count <= 0;
                end
            end
            else begin
                qr_state_count <= 0;
            end
        end
        else if (qr_state == 2) begin // 数据
            if (qr_state_count < 8) begin
                if (qr_buf[qr_state_count][qr_col_count - QR_MARGIN] == 1) begin
                    qr_data <= qr_data | (1 << qr_state_count);
                end
                qr_state_count <= qr_state_count + 1;
            end
            else begin
                qr_data_count <= qr_data_count + 1;
                qr_data_out <= qr_data;
                qr_data <= 0;
                qr_state <= 1;
                qr_state_count <= 0;
                if (qr_data_count >= QR_SIZE * QR_SIZE) begin
                    valid_out <= 1;
                end
            end
        end
    end
end

endmodule

请注意，此代码仅供参考，并且可能需要根据实际情况进行修改和调整。