led.v

10位8段LED的扫描显示程序

module led(
		clk,
		rst,
		
		di_1,di_2,di_3,di_4,di_5,
		di_6,di_7,di_8,di_9,di_10,
		
		dout,
		chip_sel);

input clk;
input rst;
input [7:0] di_1,di_2,di_3,di_4,di_5;
input [7:0] di_6,di_7,di_8,di_9,di_10;

output [7:0] dout;
output [9:0] chip_sel;

reg [3:0] i;
reg [9:0] temp_bit_dat;
reg [7:0] seg_data_tmp;

assign dout = seg_data_tmp;
assign chip_sel = temp_bit_dat;

always @(negedge rst or posedge clk)
begin
	if(rst==0)
		i=0;
	else if(i==9)
			i<=0;
	else
			i<=i+1;
end

always @(negedge rst or posedge clk)
begin
	if(rst==0)
		begin
			seg_data_tmp<=8'b0;
		end
	else
			case (i)
			4'd0:seg_data_tmp=di_1;
			4'd1:seg_data_tmp=di_2;
			4'd2:seg_data_tmp=di_3;
			4'd3:seg_data_tmp=di_4;
			4'd4:seg_data_tmp=di_5;
			4'd5:seg_data_tmp=di_6;
			4'd6:seg_data_tmp=di_7;
			4'd7:seg_data_tmp=di_8;
			4'd8:seg_data_tmp=di_9;
			4'd9:seg_data_tmp=di_10;
			default:seg_data_tmp=8'b0;
			endcase
end

always @(negedge rst or posedge clk)
begin
	if(rst==0)
		begin
			temp_bit_dat<=10'b0;
		end
	else
			case (i)
			4'd0:temp_bit_dat=10'b0000000001;
			4'd1:temp_bit_dat=10'b0000000010;
			4'd2:temp_bit_dat=10'b0000000100;
			4'd3:temp_bit_dat=10'b0000001000;
			4'd4:temp_bit_dat=10'b0000010000;
			4'd5:temp_bit_dat=10'b0000100000;
			4'd6:temp_bit_dat=10'b0001000000;
			4'd7:temp_bit_dat=10'b0010000000;
			4'd8:temp_bit_dat=10'b0100000000;
			4'd9:temp_bit_dat=10'b1000000000;
			default:temp_bit_dat=10'b0000000000;
			endcase
end

endmodule