You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
2.8 KiB
Verilog
105 lines
2.8 KiB
Verilog
module timer_decoder(
|
|
input wire sys_clk ,
|
|
input wire sys_rst_n ,
|
|
input wire [1: 0] dev_id ,
|
|
input wire [3: 0] opcode ,
|
|
input wire [4: 0] hour ,
|
|
input wire [5: 0] min ,
|
|
input wire [5: 0] sec ,
|
|
|
|
output reg [7: 0] seg_led ,
|
|
output reg [5: 0] sel_led
|
|
);
|
|
parameter FPS = 10'd1000;//20us
|
|
reg [9: 0] cnt_fps;
|
|
wire add_cnt_fps;
|
|
wire end_cnt_fps;
|
|
reg start_flag;
|
|
reg [3: 0] value ;
|
|
|
|
always @(posedge sys_clk or negedge sys_rst_n)begin
|
|
if(!sys_rst_n)begin
|
|
start_flag <= 1'b0;
|
|
end
|
|
else if((dev_id == 2'd2) && (opcode == 4'b0010))begin
|
|
start_flag <= 1'b1;
|
|
end
|
|
else if((dev_id == 2'd2) && (opcode == 4'b0001))begin
|
|
start_flag <= 1'b0;
|
|
end
|
|
else begin
|
|
start_flag <= start_flag;
|
|
end
|
|
end
|
|
|
|
|
|
|
|
//20us计数器设计
|
|
always @(posedge sys_clk or negedge sys_rst_n)begin
|
|
if(!sys_rst_n)begin
|
|
cnt_fps <= 10'd0;
|
|
end
|
|
else if((dev_id == 2'd2) && (opcode == 4'b0001))begin
|
|
cnt_fps <= 10'd0;
|
|
end
|
|
else if(add_cnt_fps)begin
|
|
if(end_cnt_fps)begin
|
|
cnt_fps <= 10'd0;
|
|
end
|
|
else begin
|
|
cnt_fps <= cnt_fps + 1'd1;
|
|
end
|
|
end
|
|
else begin
|
|
cnt_fps <= cnt_fps;
|
|
end
|
|
end
|
|
assign add_cnt_fps = start_flag;
|
|
assign end_cnt_fps = add_cnt_fps && (cnt_fps == FPS - 1'd1);
|
|
//sel_led信号进行约束
|
|
always @(posedge sys_clk or negedge sys_rst_n)begin
|
|
if(!sys_rst_n)begin
|
|
sel_led <= 6'b111_111;
|
|
end
|
|
else if(dev_id == 2'd2 && opcode == 4'b0001)begin
|
|
sel_led <= 6'b111_111;
|
|
end
|
|
else if(dev_id == 2'd2 && opcode == 4'b0010)begin
|
|
sel_led <= 6'b111_110;
|
|
end
|
|
else if(cnt_fps == FPS - 1'd1)begin
|
|
sel_led <= {sel_led[4: 0], sel_led[5]};//进行位拼接
|
|
end
|
|
else begin
|
|
sel_led <= sel_led;//数据保持
|
|
end
|
|
end
|
|
|
|
always @(*)begin
|
|
case(sel_led)
|
|
6'b111_110: value = hour / 10;
|
|
6'b111_101: value = hour % 10;
|
|
6'b111_011: value = min / 10 ;
|
|
6'b110_111: value = min % 10 ;
|
|
6'b101_111: value = sec / 10 ;
|
|
6'b011_111: value = sec % 10 ;
|
|
default : value = 0 ;
|
|
endcase
|
|
end
|
|
|
|
always @(*)begin
|
|
case(value)
|
|
4'd0 : seg_led = 8'b1100_0000;
|
|
4'd1 : seg_led = 8'b1111_1001;
|
|
4'd2 : seg_led = 8'b1010_0100;
|
|
4'd3 : seg_led = 8'b1011_0000;
|
|
4'd4 : seg_led = 8'b1001_1001;
|
|
4'd5 : seg_led = 8'b1001_0010;
|
|
4'd6 : seg_led = 8'b1000_0010;
|
|
4'd7 : seg_led = 8'b1111_1000;
|
|
4'd8 : seg_led = 8'b1000_0000;
|
|
4'd9 : seg_led = 8'b1001_0000;
|
|
default : seg_led = 8'b1100_0000;
|
|
endcase
|
|
end
|
|
endmodule
|