blob: 1b4f9f2b07cc75fcadc5eac7b1602ce6d74c0675 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
// very minimal example top-level module
module main (
output reg [3:0] gpio_led,
input wire [3:0] gpio_switch,
input wire SYSTEMCLOCK,
input wire PUSH_BUTTON_RESET_RAW // this is active low
);
wire reset;
assign reset = !PUSH_BUTTON_RESET_RAW;
reg [25:0] throb_counter = 0;
always @(posedge SYSTEMCLOCK) begin
if (reset) begin
gpio_led <= 7'b1111;
throb_counter <= 26'd0;
end else begin
gpio_led[1:0] <= gpio_switch[1:0];
gpio_led[2] <= gpio_switch[2] || gpio_switch[3];
if (throb_counter >= 26'd50_000_000) begin
gpio_led[3] <= !gpio_led[3];
throb_counter <= 26'd0;
end else begin
throb_counter <= throb_counter + 26'd1;
end
end
end
endmodule
|
