dds编程代码 希望对别人有帮助
其功能是根据dds的原理编写
源代码在线查看： control.v
//工作模式控制模块：control.v module control(clk,keyin,wavemode,length); input [3:0]keyin; // 输入键值 input clk; //系统时钟 output reg[1:0]wavemode; //输出波形模式值 output reg[23:0] length; //输出频率控制字 reg [23:0] fredata; integer single_state=1,single_frc=1; always@(posedge clk) begin case(keyin) 4'b0001:begin wavemode=2'b01; length=24'd3;end //键1：复位 4'b0010:begin case(single_state) //键2：波形模式选择 1:wavemode=2'b01; //方波 2:wavemode=2'b10; //三角波 3:wavemode=2'b11; //正弦波 default:begin wavemode=2'b01; single_state=0;end endcase single_state=single_state+1; end 4'b0100:begin case(single_frc) //键3：频率档位选择 1:length=24'd3; //1Hz~1KHz 2:length=24'd3355; //1KHz~10KHz 3:length=24'd33554; //10KHz~200KHz default:begin length=24'd671088; //大于200KHz single_frc=0;end endcase single_frc=single_frc+1; end 4'b1000:begin case(single_frc) //键4：频率步进选择 1:length=length+24'd3; //步进为1Hz 2:length=length+24'd336; //步进为100Hz 3:length=length+24'd3355; //步进为1KHz 4:length=length+24'd33554; //步进为10KHz default:length=length+24'd0; //步进为0 endcase end endcase end endmodule
