Add working LED example

1 files changed, 22 insertions, 0 deletions

diff --git a/led_toggle.v b/led_toggle.v
new file mode 100644
index 0000000..601abc9
--- /dev/null
+++ b/led_toggle.v
@@ -0,0 +1,22 @@
+// From the book
+
+module led_toggle (
+  input clk_i,
+  input key_i,
+  output [5:0] led
+);
+
+reg r_LED_1 = 1'b1;
+reg r_Switch_1 = 1'b1;
+
+always @(posedge clk_i) begin
+  r_Switch_1 <= key_i;
+  if (key_i == 1'b1 && r_Switch_1 == 1'b0) begin
+    r_LED_1 <= ~r_LED_1;
+  end
+end
+
+assign led[0] = r_LED_1;
+assign led[5:1] = 4'b1111;
+
+endmodule