SOPC自定义外设（LED数码管扫描）的问题

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SOPC自定义外设（LED数码管扫描）的问题 [复制链接]

module Display(clk,data,addr,read_en,write_en,data_out,seg,lbit);
input clk;
input read_en,write_en;
input [7:0]data;
input [3:0]addr;
output [7:0] seg;
output [7:0] lbit;
output [7:0]data_out;

reg [7:0]data_in[7:0];
reg [7:0]seg;
reg [7:0]lbit;

reg[7:0]data_out;

reg [7:0]state;
parameter S0 = 1, S1 = 2, S2 = 4,S3 = 8, S4 = 16,S5 = 32, S6 = 64, S7 = 128;
reg [31:0]clk_div;

initial
begin
data_in[0]=249;
data_in[1]=164;
data_in[2]=255;
data_in[3]=255;
data_in[4]=255;
data_in[5]=255;
data_in[6]=255;
data_in[7]=255;
state=S0;
clk_div=0;
end

always @ (state) begin
case (state)
S0:begin
lbit = 254;
seg = data_in[0];
end
S1:begin
lbit = 253;
seg = data_in[1];
end
S2:begin
lbit = 255-S2;
seg = data_in[2];
end
S3:begin
lbit = 255-S3;
seg = data_in[3];
end
S4:begin
lbit = 255-S4;
seg = data_in[4];
end
S5:begin
lbit = 255-S5;
seg = data_in[5];
end
S6:begin
lbit = 255-S6;
seg = data_in[6];
end
S7:begin
lbit = 255-S7;
seg = data_in[7];
end
endcase
end

always @ (posedge clk ) begin

if(clk_div>50_000)begin
clk_div=0;

case (state)
S0:
state <= S1;
S1:
state <= S2;
S2:
state <= S3;
S3:
state <= S4;
S4:
state <= S5;
S5:
state <= S6;
S6:
state <= S7;
S7:
state <= S0;
endcase
end
else
clk_div=clk_div+1;

if(write_en)begin
//write regs
case (addr)
0001:
data_in[0] <= data;
0010:
data_in[1] <= data;
0011:
data_in[2] <= data;
0100:
data_in[3] <= data;
0101:
data_in[4] <= data;
0110:
data_in[5] <= data;
0111:
data_in[6] <= data;
0100:
data_in[7] <= data;
default:
data_in[0] <= data_in[0];
endcase
end
if(read_en) begin
case (addr)
0001:
data_out <= data_in[0];
0010:
data_out <= data_in[1];
0011:
data_out <= data_in[2];
0100:
data_out <= data_in[3];
0101:
data_out <= data_in[4];
0110:
data_out <= data_in[5];
0111:
data_out <= data_in[6];
0100:
data_out <= data_in[7];
default:
data_out <= data_in[0];
endcase
end

end

endmodule