设计UART通信协议：根据题目要求，需要定义一个自定义的通信协议，包括同步头、参数标记和参数信息。可以使用Verilog或VHDL语言编写UART通信协议的发送和接收模块。

好的，我来设计一下UART通信协议的发送和接收模块，假设UART通信波特率为115200，数据位为8位，停止位为1位，同步头为7E7E（固定2字节），参数标记为1字节，参数信息为1字节。

UART发送模块：

module uart_tx(
  input clk, //时钟
  input rst, //复位
  input [7:0] tx_data, //待发送数据
  input tx_en, //发送使能信号
  output reg tx_done, //发送完成信号
  output reg [1:0] tx_state, //发送状态
  output reg [9:0] tx_count, //发送计数器
  output reg [7:0] tx_buf //发送缓冲区
);

//状态定义
parameter IDLE = 2'b00;
parameter START = 2'b01;
parameter DATA = 2'b10;
parameter STOP = 2'b11;

//波特率计算
parameter BAUD_RATE = 115200;
parameter TICKS_PER_BIT = 1000000000 / BAUD_RATE;

//同步头和参数标记
parameter SYNC1 = 8'h7E;
parameter SYNC2 = 8'h7E;
parameter PARAM_FLAG = 8'h01;

//状态寄存器
reg [1:0] state = IDLE;
reg [9:0] count = 10'd0;
reg [7:0] buf = 8'h00;

always @(posedge clk) begin
  if (rst) begin
    state <= IDLE;
    count <= 10'd0;
    buf <= 8'h00;
    tx_done <= 1'b0;
    tx_state <= IDLE;
    tx_count <= 10'd0;
  end
  else begin
    case (state)
      IDLE: begin
        //等待发送使能信号
        if (tx_en) begin
          //初始化发送状态
          tx_done <= 1'b0;
          tx_state <= START;
          tx_count <= 10'd0;
        end
      end
      START: begin
        //发送同步头
        buf <= SYNC1;
        if (count == TICKS_PER_BIT) begin
          buf <= SYNC2;
          count <= 10'd0;
        end
        else begin
          count <= count + 1;
        end
        //进入数据发送状态
        if (count == 2 * TICKS_PER_BIT) begin
          buf <= tx_data;
          count <= 10'd0;
          tx_state <= DATA;
        end
      end
      DATA: begin
        //发送数据
        if (count == TICKS_PER_BIT) begin
          buf <= tx_data;
          count <= 10'd0;
        end
        else begin
          count <= count + 1;
        end
        //发送停止位
        if (count == 10 * TICKS_PER_BIT) begin
          buf <= 1'b0;
          count <= 10'd0;
          tx_state <= STOP;
        end
      end
      STOP: begin
        //发送完成
        tx_done <= 1'b1;
        tx_state <= IDLE;
      end
      default: begin
        //默认状态
        state <= IDLE;
      end
    endcase
    //发送缓冲区
    tx_buf <= buf;
  end
end

endmodule

UART接收模块：

module uart_rx(
  input clk, //时钟
  input rst, //复位
  input rx_data, //接收数据
  input rx_en, //接收使能信号
  output reg rx_done, //接收完成信号
  output reg [1:0] rx_state, //接收状态
  output reg [9:0] rx_count, //接收计数器
  output reg [7:0] rx_buf, //接收缓冲区
  output reg [7:0] rx_param //参数信息
);

//状态定义
parameter IDLE = 2'b00;
parameter START = 2'b01;
parameter DATA = 2'b10;
parameter STOP = 2'b11;

//波特率计算
parameter BAUD_RATE = 115200;
parameter TICKS_PER_BIT = 1000000000 / BAUD_RATE;

//同步头和参数标记
parameter SYNC1 = 8'h7E;
parameter SYNC2 = 8'h7E;
parameter PARAM_FLAG = 8'h01;
parameter FEEDBACK_FLAG = 8'h88;

//状态寄存器
reg [1:0] state = IDLE;
reg [9:0] count = 10'd0;
reg [7:0] buf = 8'h00;
reg [7:0] param = 8'h00;

always @(posedge clk) begin
  if (rst) begin
    state <= IDLE;
    count <= 10'd0;
    buf <= 8'h00;
    rx_done <= 1'b0;
    rx_state <= IDLE;
    rx_count <= 10'd0;
    rx_buf <= 8'h00;
    rx_param <= 8'h00;
  end
  else begin
    case (state)
      IDLE: begin
        //等待接收使能信号
        if (rx_en) begin
          //初始化接收状态
          rx_done <= 1'b0;
          rx_state <= START;
          rx_count <= 10'd0;
        end
      end
      START: begin
        //接收同步头
        if (count == TICKS_PER_BIT) begin
          if (rx_data == SYNC1) begin
            buf <= SYNC1;
            count <= 10'd0;
          end
          else begin
            //同步头错误，重新开始接收
            rx_state <= IDLE;
          end
        end
        else if (count == 2 * TICKS_PER_BIT) begin
          if (rx_data == SYNC2) begin
            buf <= SYNC2;
            count <= 10'd0;
            rx_state <= DATA;
          end
          else begin
            //同步头错误，重新开始接收
            rx_state <= IDLE;
          end
        end
        else begin
          count <= count + 1;
        end
      end
      DATA: begin
        //接收参数标记
        if (count == 3 * TICKS_PER_BIT) begin
          if (rx_data == PARAM_FLAG) begin
            buf <= PARAM_FLAG;
            count <= 10'd0;
            rx_state <= STOP;
          end
          else if (rx_data == FEEDBACK_FLAG) begin
            buf <= FEEDBACK_FLAG;
            count <= 10'd0;
            rx_state <= STOP;
          end
          else begin
            //参数标记错误，重新开始接收
            rx_state <= IDLE;
          end
        end
        else if (count == 4 * TICKS_PER_BIT) begin
          param <= rx_data;
          rx_param <= rx_data;
          buf <= rx_data;
          count <= 10'd0;
          rx_state <= STOP;
        end
        else begin
          count <= count + 1;
        end
      end
      STOP: begin
        //接收完成
        rx_done <= 1'b1;
        rx_state <= IDLE;
      end
      default: begin
        //默认状态
        state <= IDLE;
      end
    endcase
    //接收缓冲区
    rx_buf <= buf;
  end
end

endmodule

以上是一个比较简单的UART通信协议的发送和接收模块，仅供参考。实际应用中需要根据具体要求进行修改和优化。