From cb0a0f7ef81555cb5c8e51cabb806a302c92b91a Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Wed, 19 Jul 2017 15:23:15 +0200
Subject: Improve rs232demo test bench

---
 examples/icestick/rs232demo_tb.v | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

(limited to 'examples')

diff --git a/examples/icestick/rs232demo_tb.v b/examples/icestick/rs232demo_tb.v
index 3e95abf..5b9aee1 100644
--- a/examples/icestick/rs232demo_tb.v
+++ b/examples/icestick/rs232demo_tb.v
@@ -1,8 +1,11 @@
 module testbench;
 	localparam integer PERIOD = 12000000 / 9600;
 
-	reg clk = 1;
-	always #5 clk = ~clk;
+	// reg clk = 0;
+	// initial #10 forever #5 clk = ~clk;
+
+	reg clk;
+	always #5 clk = (clk === 1'b0);
 
 	reg RX = 1;
 	wire TX;
@@ -48,12 +51,7 @@ module testbench;
 			$dumpvars(0, testbench);
 		end
 
-		// send break
-		repeat (20 * PERIOD) @(posedge clk);
-		RX <= 0;
-		repeat (20 * PERIOD) @(posedge clk);
-		RX <= 1;
-		repeat (20 * PERIOD) @(posedge clk);
+		repeat (10 * PERIOD) @(posedge clk);
 
 		// turn all LEDs on
 		send_byte("1");
@@ -70,6 +68,7 @@ module testbench;
 		send_byte("5");
 
 		repeat (10 * PERIOD) @(posedge clk);
+
 		$finish;
 	end
 endmodule
-- 
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