可以使用键盘实现加减数的数码管的verilog hdl程序(基于黑金开发板)

module test(RESET,CLOCK,SEL,DIG,KEY_UP,KEY_DOWN);
input RESET,CLOCK,KEY_UP,KEY_DOWN;
output reg[5:0] SEL;
output reg[7:0] DIG;
parameter cnt=32'd2_000_0;
reg[31:0] cnt1;
reg b;
wire t;
always @ (posedge CLOCK or negedge RESET)
begin
 if(!RESET)
 begin
  cnt1<=0;
  b<=0;
  end
   else if(cnt1==cnt)
    begin
    b<=~b;
    cnt1<=0;
    end
     else
      begin
      cnt1<=cnt1+1;
      b<=b;
      end
end
assign t=b;
parameter cnt2=32'd5_000_000;
reg[22:0] cnt3;
reg d;
wire din;
always @ (posedge CLOCK or negedge RESET)
begin
 if(!RESET)
  d<=1;
   else if((!KEY_UP)||(!KEY_DOWN))
    d<=0;
     else
      d<=1;
end
assign din=d;
reg[31:0] size;
wire[31:0] count;
always @ (posedge CLOCK or negedge RESET)
begin
 if(!RESET)
  size<=0;
   else if(cnt3==cnt2)
    begin
     cnt3<=0;
     if(din==0)
     begin
      if(!KEY_UP)
      begin
      size<=size+1;
      if(size>=59)
      size<=0;
      end
      else if(!KEY_DOWN)
      begin
      size<=size-1;
      if(size<=0)
      size<=59;
      end
      end
    end
    else
    cnt3<=cnt3+1;
end
assign count=size;
        
always @ (posedge CLOCK or negedge RESET)
begin
 if(!RESET)
  DIG<=display(3);
   else if(t)
   begin
    DIG<=display(ge(count));
    SEL<=6'hfe;
   end
     else
     begin
      DIG<=display(shi(count));
      SEL<=6'hfd;
     end
end
function [7:0] display;
input[3:0] key;
case(key)
0: display=8'hc0;
1: display=8'hf9;
2: display=8'ha4;
3: display=8'hb0;
4: display=8'h99;
5: display=8'h92;
6: display=8'h82;
7: display=8'hf8;
8: display=8'h80;
default: display=8'h90;
endcase
endfunction
function[31:0]  shi;
input [31:0] cou;
shi=cou/10;
endfunction
function[31:0]  ge;
input [31:0] cou;
ge=cou%10;
endfunction
endmodule