1 files changed, 14 insertions, 11 deletions
diff --git a/blinky/blinky.v b/blinky/blinky.v
index 8447683..2b23000 100644
--- a/blinky/blinky.v
+++ b/blinky/blinky.v
@@ -1,26 +1,25 @@
 /*
- *  
+ *
  *  Copyright(C) 2018 Gerald Coe, Devantech Ltd <gerry@devantech.co.uk>
- * 
+ *
  *  Permission to use, copy, modify, and/or distribute this software for any purpose with or
  *  without fee is hereby granted, provided that the above copyright notice and 
  *  this permission notice appear in all copies.
- * 
+ *
  *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO
  *  THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 
  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 
  *  DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  *  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
  *  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- * 
+ *
  */
 
-
 // Blink an LED provided an input clock
-/* module */
-module top (clk, led1, led2, led3, led4, led5, led6, led7, led8, lcol1, lcol2, lcol3, lcol4 );
+module blinky (clk, btn, led1, led2, led3, led4, led5, led6, led7, led8, lcol1, lcol2, lcol3, lcol4 );
     /* I/O */
     input clk;
+    input btn;
     output led1;
     output led2;
     output led3;
@@ -38,13 +37,17 @@ module top (clk, led1, led2, led3, led4, led5, led6, led7, led8, lcol1, lcol2, l
     reg [31:0] counter = 32'b0;
 
     /* LED drivers - counter is inverted for display because leds are active low */
-    assign {led8, led7, led6, led5, led4, led3, led2, led1} = counter[26:19] ^ 8'hff; 
+    assign {led8, led7, led6, led5, led4, led3, led2, led1} = counter[28:21] ^ 8'hff;
     assign {lcol4, lcol3, lcol2, lcol1} = 4'b1110;
 
-
-    /* Count up on every edge of the incoming 12MHz clk */
+    /* Count on every edge of the incoming 12MHz clk */
     always @ (posedge clk) begin
-        counter <= counter + 1;
+        if (btn) begin
+            counter <= counter + 1;
+        end
+        else begin
+            counter <= counter - 1;
+        end
     end
 
 endmodule