里面的子程序也请给我

好的，下面给出一个基于 Verilog 的 I2C 总线协议的子程序，用于实现 SCCB 协议中的读取和写入操作。

module i2c_master (
  input wire clk,
  input wire rstn,
  input wire start,
  input wire stop,
  input wire [7:0] addr,
  inout wire [7:0] data_in,
  inout wire [7:0] data_out,
  output reg ack,
  inout wire sda,
  inout wire scl
);

  parameter ADDR_WIDTH = 7;
  parameter DATA_WIDTH = 8;
  parameter INIT_CLK_HIGH = 1'b1;
  parameter INIT_CLK_LOW = 1'b1;
  parameter IDLE_TIME = 8;
  
  localparam IDLE = 2'b00;
  localparam START = 2'b01;
  localparam ADDR = 2'b10;
  localparam DATA = 2'b11;
  
  reg [8:0] state;
  reg [7:0] addr_reg;
  reg [7:0] data_reg;
  reg [3:0] bit_cnt;
  reg [3:0] byte_cnt;
  reg start_cond;
  reg stop_cond;
  reg [IDLE_TIME-1:0] idle_cnt;
  reg [7:0] sda_drive;
  
  assign sda = (sda_drive == 1'b1) ? 1'bz : sda_drive;
  
  always @(posedge clk) begin
    if (!rstn) begin
      state <= IDLE;
      addr_reg <= 0;
      data_reg <= 0;
      bit_cnt <= 0;
      byte_cnt <= 0;
      start_cond <= 0;
      stop_cond <= 0;
      idle_cnt <= 0;
      ack <= 1'b1;
      sda_drive <= 1'b1;
    end else begin
      case (state)
        IDLE: begin
          if (idle_cnt < IDLE_TIME) begin
            idle_cnt <= idle_cnt + 1;
          end else if (start) begin
            state <= START;
            start_cond <= 1;
            idle_cnt <= 0;
          end else begin
            idle_cnt <= 0;
          end
        end
        
        START: begin
          if (start_cond) begin
            sda_drive <= 1'b0;
            scl <= INIT_CLK_HIGH;
            start_cond <= 0;
            idle_cnt <= 0;
          end else if (idle_cnt < IDLE_TIME) begin
            idle_cnt <= idle_cnt + 1;
          end else begin
            state <= ADDR;
            ack <= 1'b1;
            idle_cnt <= 0;
          end
        end
        
        ADDR: begin
          if (bit_cnt < ADDR_WIDTH) begin
            if (idle_cnt == 0) begin
              sda_drive <= addr[ADDR_WIDTH-1-bit_cnt];
              bit_cnt <= bit_cnt + 1;
            end else if (idle_cnt < IDLE_TIME) begin
              idle_cnt <= idle_cnt + 1;
            end
          end else if (byte_cnt == 0) begin
            if (idle_cnt == 0) begin
              sda_drive <= 1'b1;
              bit_cnt <= 0;
              byte_cnt <= byte_cnt + 1;
            end else if (idle_cnt < IDLE_TIME) begin
              idle_cnt <= idle_cnt + 1;
            end
          end else begin
            if (idle_cnt == 0) begin
              if (start && !stop) begin
                state <= START;
                start_cond <= 1;
              end else if (!start && stop) begin
                state <= IDLE;
                idle_cnt <= 0;
              end else begin
                state <= DATA;
                bit_cnt <= 0;
                ack <= 0;
              end
              byte_cnt <= 0;
            end else if (idle_cnt < IDLE_TIME) begin
              idle_cnt <= idle_cnt + 1;
            end
          end
        end
        
        DATA: begin
          if (bit_cnt < DATA_WIDTH) begin
            if (idle_cnt == 0) begin
              sda_drive <= data_reg[DATA_WIDTH-1-bit_cnt];
              bit_cnt <= bit_cnt + 1;
            end else if (idle_cnt < IDLE_TIME) begin
              idle_cnt <= idle_cnt + 1;
            end
          end else if (byte_cnt == 0) begin
            if (idle_cnt == 0) begin
              sda_drive <= 1'b1;
              bit_cnt <= 0;
              byte_cnt <= byte_cnt + 1;
            end else if (idle_cnt < IDLE_TIME) begin
              idle_cnt <= idle_cnt + 1;
            end
          end else begin
            if (idle_cnt == 0) begin
              if (start && !stop) begin
                state <= START;
                start_cond <= 1;
              end else if (!start && stop) begin
                state <= IDLE;
                idle_cnt <= 0;
              end else begin
                state <= ADDR;
                bit_cnt <= 0;
                ack <= 0;
              end
              byte_cnt <= 0;
            end else if (idle_cnt < IDLE_TIME) begin
              idle_cnt <= idle_cnt + 1;
            end
          end
        end
      endcase
    end
  end
  
  always @(negedge scl) begin
    if (!rstn) begin
      sda_drive <= 1'b1;
    end else begin
      case (state)
        START: begin
          sda_drive <= 1'b0;
        end
        
        ADDR: begin
          if (bit_cnt < ADDR_WIDTH) begin
            sda_drive <= addr[ADDR_WIDTH-1-bit_cnt];
          end else if (byte_cnt == 0) begin
            sda_drive <= 1'b1;
          end else begin
            sda_drive <= data_reg[DATA_WIDTH-1-bit_cnt];
          end
        end
        
        DATA: begin
          if (bit_cnt < DATA_WIDTH) begin
            sda_drive <= data_reg[DATA_WIDTH-1-bit_cnt];
          end else if (byte_cnt == 0) begin
            sda_drive <= 1'b1;
          end else begin
            sda_drive <= data_out[DATA_WIDTH-1-bit_cnt];
          end
        end
      endcase
    end
  end
  
  always @(posedge scl or negedge scl) begin
    if (!rstn) begin
      bit_cnt <= 0;
    end else begin
      if (state == ADDR && bit_cnt == ADDR_WIDTH && byte_cnt > 0) begin
        data_reg <= data_in;
      end else if (state == DATA && byte_cnt > 0) begin
        if (bit_cnt == DATA_WIDTH) begin
          data_out <= sda;
        end else if (bit_cnt == DATA_WIDTH+1) begin
          ack <= 1'b1;
          byte_cnt <= byte_cnt + 1;
        end
      end
    end
  end
  
  always @(posedge scl or negedge scl) begin
    if (!rstn) begin
      byte_cnt <= 0;
    end else begin
      if (state == ADDR && bit_cnt == ADDR_WIDTH && byte_cnt > 0) begin
        ack <= sda;
      end else if (state == DATA && byte_cnt > 0) begin
        if (bit_cnt == DATA_WIDTH) begin
          ack <= 1'b0;
        end else if (bit_cnt == DATA_WIDTH+1) begin
          byte_cnt <= byte_cnt + 1;
        end
      end
    end
  end
  
  always @(posedge scl) begin
    if (!rstn) begin
      bit_cnt <= 0;
    end else begin
      bit_cnt <= bit_cnt + 1;
    end
  end
  
  always @(posedge scl) begin
    if (!rstn) begin
      sda_drive <= 1'b1;
    end else begin
      if (state == DATA && byte_cnt > 0 && bit_cnt == DATA_WIDTH) begin
        data_out <= sda;
      end
    end
  end
  
  always @(posedge scl or negedge scl) begin
    if (!rstn) begin
      sda_drive <= 1'b1;
    end else begin
      if (state == IDLE || state == START) begin
        sda_drive <= 1'b1;
      end else if (state == ADDR && bit_cnt == ADDR_WIDTH && byte_cnt == 0) begin
        sda_drive <= 1'b0;
      end else if (state == DATA && byte_cnt == 0) begin
        sda_drive <= 1'b0;
      end
    end
  end
  
endmodule

以上代码定义了一个名为 i2c_master 的模块，包含了时钟信号、复位信号、开始信号、停止信号、地址、输入数据、输出数据和应答信号。该模块实现了 I2C 总线协议的主机端，用于发送和接收数据。在发送和接收数据的过程中，该模块会根据 SCCB 协议的规则来发送和接收数据，从而实现了 SCCB 协议。

需要注意的是，该子程序只是 I2C 总线协议的实现，还需要在 SCCB 模块中进行调用和配置，才能实现 SCCB 协议的功能。