module timecode_output #(
    parameter REG_START_ADD  = 0,
    parameter SYS_CLOCK_FREQ = 10000000
) (
    input clk,   //clock input
    input rst_n, //asynchronous reset input, low active

    //寄存器读写接口    
    input       [31:0] addr,
    input       [31:0] wr_data,
    input              wr_en,
    output wire [31:0] rd_data,

    /*******************************************************************************
     *                                TIMECODE输出                                 *
     *******************************************************************************/

    input [31:0] ext_timecode_format,
    input [63:0] ext_timecode_data,
    input ext_timecode_tigger_sig,
    input ext_timecode_serial_data,

    input [63:0] internal_timecode_data,
    input internal_timecode_tigger_sig,
    input [31:0] internal_timecode_format,
    input internal_timecode_serial_data,

    /*******************************************************************************
     *                                  输出接口                                   *
     *******************************************************************************/
    output  stm32if_timecode_tigger_sig,

    output reg timecode_out_bnc,
    output reg timecode_out_bnc_select,    // 电平选择 0line,1:mic
    output reg timecode_out_bnc_state_led,

    output reg timecode_out_headphone,
    output reg timecode_out_headphone_select,    // 电平选择 0line,1:mic
    output reg timecode_out_headphone_state_led

);
  // 1ms
  reg [31:0] r0_timecode_select;  //时码输入选择器
  reg [31:0] r1_timecode0;  //时码原始码0 //注意这个数据要比ext_timecode_serial_data晚一帧
  reg [31:0] r2_timecode1;  //时码原始码1 //注意这个数据要比ext_timecode_serial_data晚一帧
  reg [31:0] r3_timecode_format;  //
  reg [31:0] r4_bnc_outut_level_select;  // 0:line, 1:mic
  reg [31:0] r5_headphone_outut_level_select;  // 0:line, 1:mic

  wire [31:0] reg_wr_index;

  zutils_register_advanced #(
      .REG_START_ADD(REG_START_ADD)
  ) _register (
      .clk(clk),
      .rst_n(rst_n),
      .addr(addr),
      .wr_data(wr_data),
      .wr_en(wr_en),
      .rd_data(rd_data),

      .reg0(r0_timecode_select),
      .reg1(r1_timecode0),
      .reg2(r2_timecode1),
      .reg3(r3_timecode_format),
      .reg4(r4_bnc_outut_level_select),
      .reg5(r5_headphone_outut_level_select),


      .reg_wr_sig(reg_wr_sig),
      .reg_index (reg_wr_index)
  );

  always @(posedge clk or negedge rst_n) begin
    if (!rst_n) begin
      r0_timecode_select <= 0;
      r4_bnc_outut_level_select <= 0;
      r5_headphone_outut_level_select <= 0;
    end else begin
      if (reg_wr_sig) begin
        case (reg_wr_index)
          31'h0: r0_timecode_select <= wr_data;
          31'h4: r4_bnc_outut_level_select <= wr_data;
          31'h5: r5_headphone_outut_level_select <= wr_data;
          default: begin
          end
        endcase
      end
    end
  end


  reg out_timecode_serial_data;
  reg timecode_tigger_sig;
  always @(posedge clk or negedge rst_n) begin
    if (!rst_n) begin
      r1_timecode0 <= 0;
      r2_timecode1 <= 0;
      r3_timecode_format <= 0;
      out_timecode_serial_data <= 0;
      timecode_tigger_sig <= 0;
    end else begin
      case (r0_timecode_select)
        0: begin
          r1_timecode0 <= 0;
          r2_timecode1 <= 0;
          r3_timecode_format <= 0;
          out_timecode_serial_data <= 0;
          timecode_tigger_sig <= 0;
        end
        // 内部时码
        1: begin
          r1_timecode0 <= internal_timecode_data[31:0];
          r2_timecode1 <= internal_timecode_data[63:32];
          r3_timecode_format <= internal_timecode_format;
          out_timecode_serial_data <= internal_timecode_serial_data;
          timecode_tigger_sig <= internal_timecode_tigger_sig;
        end
        // 外部时码
        2: begin
          r1_timecode0 <= ext_timecode_data[31:0];
          r2_timecode1 <= ext_timecode_data[63:32];
          r3_timecode_format <= ext_timecode_format;
          out_timecode_serial_data <= ext_timecode_serial_data;
          timecode_tigger_sig <= ext_timecode_tigger_sig;
        end

        default: begin
          r1_timecode0 <= 0;
          r2_timecode1 <= 0;
          r3_timecode_format <= 0;
          out_timecode_serial_data <= 0;
          timecode_tigger_sig <= 0;
        end
      endcase
    end
  end


  zutils_pluse_generator _pluse_generator (
      .clk(clk),
      .rst_n(rst_n),
      .pluse_width(1000),  //1ms
      .pluse_delay(32'd0),
      .trigger(timecode_tigger_sig),
      .output_signal(stm32if_timecode_tigger_sig)
  );


  always @(*) begin
    timecode_out_bnc <= out_timecode_serial_data;
    timecode_out_bnc_select <= r4_bnc_outut_level_select[0];
    timecode_out_bnc_state_led <= 1;

    timecode_out_headphone <= out_timecode_serial_data;
    timecode_out_headphone_select <= r5_headphone_outut_level_select[0];
    timecode_out_headphone_state_led <= 1;
  end





endmodule