gateware: Blinky working

Signed-off-by: David Shah <dave@ds0.me>

gateware/simple/demo.v

@@ -1,3 +1,5 @@
+`default_nettype none
+
 module demo_top(
 	input clk_12,
 	input [3:0] btn,
@@ -8,10 +10,10 @@ module demo_top(
 	reg [11:0] ctr_scroll = 1'b1;
 	reg clk_div = 0;
 	
-	localparam DIV = 20;
+	localparam DIV = 21;
 	reg [DIV-1:0] div_ctr = 0;
 
-	always @(posedge clk) begin
+	always @(posedge clk_12) begin
 		{clk_div, div_ctr} <= div_ctr + 1'b1;
 
 		if (clk_div) begin
@@ -24,8 +26,8 @@ module demo_top(
 
 	led_ctrl led_ctrl_i (
 		.clk(clk_12),
-		.led_in_yr({dip_sw, btn}),
-		.led_in_bg(ctr_scroll),
+		.led_in_yr({ctr_scroll[5:0], dip_sw[1:0], btn}),
+		.led_in_bg({dip_sw[7:2], ctr_scroll[11:6]}),
 		.led_pin(led)
 	);
 

gateware/simple/led_ctrl.v

@@ -17,6 +17,7 @@ module led_ctrl (
 	always @(posedge clk) ctr <= ctr + 1'b1;
 
 	genvar i;
+	wire [11:0] led_o, led_en;
 	generate
 		for (i = 0; i < 12; i = i + 1'b1) begin
 			/*
@@ -25,9 +26,11 @@ module led_ctrl (
 				Only BG asserted : LED at constant 1'b1
 				Neither asserted : LED off (1'bz)
 			*/
-			assign led_pin[i] = led_in_yr ?
-									(led_in_bg ? ctr[DIV_FACTOR - 1] : 1'b0) :
-									(led_in_bg ? 1'b1 : 1'bz);
+			assign led_o[i] = led_in_yr[i] ?
+								(led_in_bg[i] ? ctr[DIV_FACTOR - 1] : 1'b0) :
+								1'b1;
+			assign led_en[i] = led_in_yr[i] || led_in_bg[i];
+			assign led_pin[i] = led_en[i] ? led_o[i] : 1'bz;	
 		end
 	endgenerate