53--FPGA Verilog DDS簡易信號發生器

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2020/06/04 15:19:44
// Design Name: 
// Module Name: dds_3
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////

可實現正弦波，餘弦波，三角波（符號位待考慮），方波，如果要調頻調佔空比可以把裏面的關鍵參數改成輸入信號
DDS模式選擇Rasterized
module dds_3(
    input clk,
    input [1:0]key,//選擇信號
    input rst_n,
    input axis_config_tvalid,
    input [15:0]config_poff,config_pinc,
    output reg[7:0]  outdata,
    output [7:0]cos_data_tdata
    );
  
    wire [7:0]sin_data_tdata;

    wire m_axis_data_tvalid,m_axis_phase_tvalid,event_pinc_invalid,event_poff_invalid;
      wire [15:0]m_axis_phase_tdata;
   //DDS正餘弦波發生模塊
    dds_compiler_0 dds (
  .aclk(clk),                                  // input wire aclk
  .s_axis_config_tvalid(axis_config_tvalid),  // input wire s_axis_config_tvalid
  .s_axis_config_tdata({config_poff,config_pinc}),    // input wire [31 : 0] s_axis_config_tdata
  .m_axis_data_tvalid(m_axis_data_tvalid),      // output wire m_axis_data_tvalid
  
  .m_axis_data_tdata({sin_data_tdata,cos_data_tdata}),        // output wire [15 : 0] m_axis_data_tdata
  
  .m_axis_phase_tvalid(m_axis_phase_tvalid),    // output wire m_axis_phase_tvalid
  .m_axis_phase_tdata(m_axis_phase_tdata),      // output wire [15 : 0] m_axis_phase_tdata
  .event_pinc_invalid(event_pinc_invalid),      // output wire event_pinc_invalid
  .event_poff_invalid(event_poff_invalid)      // output wire event_poff_invalid
);
//方波發生模塊
    reg [23:0]dutydata;
    wire [23:0]duty_reg;
    reg [23:0]cnt;
    
 always@(posedge clk or negedge rst_n)begin
        if(!rst_n)begin
            cnt<=24'b0;
        end
        else if(cnt==24'd499)
            cnt<=24'b0;
        else cnt<=cnt+1'b1;
end
    
always@(posedge clk or negedge rst_n)begin
        if(!rst_n)begin
            dutydata<=24'd100;
        end
        else if(cnt<24'd100)
            dutydata<=24'd100;
        else dutydata<=24'd0;
end
assign duty_reg=dutydata;
 
 //三角波發生模塊
 wire  [7:0]tri_reg_data;
 reg [7:0]tri_data;
reg [8:0]cnt1;
 always@(posedge clk or negedge rst_n)begin
        if(!rst_n)begin
            cnt1<=9'b0;
        end
        else if(cnt1==9'd99)
            cnt1<=9'b0;
        else cnt1<=cnt1+1'b1;
end


 always @(posedge clk or negedge rst_n)begin
        if(!rst_n)begin
            tri_data<=8'd0;
        end
        else if(cnt1<9'd49)
            tri_data<={1'b1,cnt1};
        else    
            tri_data<={1'b1,9'd100-cnt1};

            
 end
assign tri_reg_data=tri_data;//可以通過加減常數進行偏置

//選擇模塊
 always@(posedge clk or negedge rst_n)begin
        case(key)
           2'b00:   outdata<=sin_data_tdata;
           2'b01:    outdata<=cos_data_tdata;
           2'b10:   outdata<=duty_reg;
           2'b11:     outdata<=tri_reg_data;
            endcase
 end
endmodule

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2020/06/04 17:58:40
// Design Name: 
// Module Name: dds_tb
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////


module dds_tb(
    );
    
    reg clk;
    reg [1:0]key;
    reg rst_n;
    reg axis_config_tvalid;
    reg [15:0]config_poff,config_pinc;
    wire [7:0] outdata;
    wire[7:0]cos_data_tdata;
    dds_3 u1(.clk(clk),.rst_n(rst_n),.key(key),.axis_config_tvalid(axis_config_tvalid),.config_poff(config_poff),.config_pinc(config_pinc),.outdata(outdata),.cos_data_tdata(cos_data_tdata));
    initial begin
        clk<=1'b0;
        rst_n<=1'b0;
        key<=2'b00;
        axis_config_tvalid<=1'b1;
        config_poff<=16'd0;
        config_pinc<=16'b11001000;
        #100 rst_n<=1'b1;
        #5000 key<=2'b01;
          #5000 key<=2'b10;
            #20000 key<=2'b11; 
    end
    always #5 clk<=~clk;
endmodule