From 617693e69128982ce1be91b76c541d6ae1950ad8 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Tue, 8 Nov 2016 19:07:22 +0100
Subject: [PATCH] Progress in examples/gowin/

---
 examples/gowin/.gitignore  |  2 ++
 examples/gowin/demo.cst    | 58 +++++++++++++++++++++++++++-----------
 examples/gowin/demo.v      |  9 +++---
 examples/gowin/run.sh      |  7 +++++
 examples/gowin/testbench.v | 40 ++++++++++++++++++++++++++
 5 files changed, 95 insertions(+), 21 deletions(-)
 create mode 100644 examples/gowin/testbench.v

diff --git a/examples/gowin/.gitignore b/examples/gowin/.gitignore
index 823caa1d7..71030bdb8 100644
--- a/examples/gowin/.gitignore
+++ b/examples/gowin/.gitignore
@@ -4,3 +4,5 @@ demo.rpt
 demo_syn.v
 demo_out.v
 demo_tr.html
+testbench
+testbench.vcd
diff --git a/examples/gowin/demo.cst b/examples/gowin/demo.cst
index 0b14b5bd6..22d7eb668 100644
--- a/examples/gowin/demo.cst
+++ b/examples/gowin/demo.cst
@@ -1,17 +1,41 @@
-IO_LOC "clk"    D11;
-IO_LOC "led1"   D22;
-IO_LOC "led2"   E22;
-IO_LOC "led3"   G22;
-IO_LOC "led4"   J22;
-IO_LOC "led5"   L22;
-IO_LOC "led6"   L19;
-IO_LOC "led7"   L20;
-IO_LOC "led8"   M21;
-IO_LOC "led9"   N19;
-IO_LOC "led10"  R19;
-IO_LOC "led11"  T18;
-IO_LOC "led12"  AA22;
-IO_LOC "led13"  U18;
-IO_LOC "led14"  V20;
-IO_LOC "led15"  AA21;
-IO_LOC "led16"  AB21;
+// 50 MHz Clock
+IO_LOC "clk" D11;
+
+// LEDs
+IO_LOC "leds[0]"  D22;
+IO_LOC "leds[1]"  E22;
+IO_LOC "leds[2]"  G22;
+IO_LOC "leds[3]"  J22;
+IO_LOC "leds[4]"  L22;
+IO_LOC "leds[5]"  L19;
+IO_LOC "leds[6]"  L20;
+IO_LOC "leds[7]"  M21;
+IO_LOC "leds[8]"  N19;
+IO_LOC "leds[9]"  R19;
+IO_LOC "leds[10]" T18;
+IO_LOC "leds[11]" AA22;
+IO_LOC "leds[12]" U18;
+IO_LOC "leds[13]" V20;
+IO_LOC "leds[14]" AA21;
+IO_LOC "leds[15]" AB21;
+
+
+// 7-Segment Display
+IO_LOC "seg7dig[0]" E20;
+IO_LOC "seg7dig[1]" G18;
+IO_LOC "seg7dig[2]" G20;
+IO_LOC "seg7dig[3]" F21;
+IO_LOC "seg7dig[4]" J20;
+IO_LOC "seg7dig[5]" H21;
+IO_LOC "seg7dig[6]" H18;
+IO_LOC "seg7dig[7]" D20;
+IO_LOC "seg7sel[0]" C19;
+IO_LOC "seg7sel[1]" B22;
+IO_LOC "seg7sel[2]" C20;
+IO_LOC "seg7sel[3]" C21;
+
+// Switches
+IO_LOC "sw[0]" AB20;
+IO_LOC "sw[1]" AB19;
+IO_LOC "sw[2]" AB18;
+IO_LOC "sw[3]" AB17;
diff --git a/examples/gowin/demo.v b/examples/gowin/demo.v
index e1a2f19ec..6ea108384 100644
--- a/examples/gowin/demo.v
+++ b/examples/gowin/demo.v
@@ -1,11 +1,12 @@
 module demo (
 	input clk,
-	output led1, led2, led3, led4, led5, led6, led7, led8,
-	output led9, led10, led11, led12, led13, led14, led15, led16
+	input [3:0] sw,
+	output [15:0] leds,
+	output [7:0] seg7dig,
+	output [3:0] seg7sel
 );
 	localparam PRESCALE = 20;
 	reg [PRESCALE+3:0] counter = 0;
 	always @(posedge clk) counter <= counter + 1;
-	assign {led1, led2, led3, led4, led5, led6, led7, led8,
-	        led9, led10, led11, led12, led13, led14, led15, led16} = 1 << counter[PRESCALE +: 4];
+	assign leds = 1 << counter[PRESCALE +: 4];
 endmodule
diff --git a/examples/gowin/run.sh b/examples/gowin/run.sh
index 738e845e5..33a7b5c37 100644
--- a/examples/gowin/run.sh
+++ b/examples/gowin/run.sh
@@ -3,3 +3,10 @@ set -ex
 yosys -p "synth_gowin -top demo -vout demo_syn.v" demo.v
 $GOWIN_HOME/bin/gowin -d demo_syn.v -cst demo.cst -sdc demo.sdc -p GW2A55-PBGA484-6 \
 		-warning_all -out demo_out.v -rpt demo.rpt -tr demo_tr.html -bit demo.bit
+
+# post place&route simulation (icarus verilog)
+if false; then
+	iverilog -D POST_IMPL -o testbench -s testbench testbench.v \
+			demo_out.v $(yosys-config --datdir/gowin/cells_sim.v)
+	vvp -N testbench
+fi
diff --git a/examples/gowin/testbench.v b/examples/gowin/testbench.v
new file mode 100644
index 000000000..6d206381e
--- /dev/null
+++ b/examples/gowin/testbench.v
@@ -0,0 +1,40 @@
+module testbench;
+	reg clk;
+
+	initial begin
+		#5 clk = 0;
+		forever #5 clk = ~clk;
+	end
+
+	wire [15:0] leds;
+
+	initial begin
+		// $dumpfile("testbench.vcd");
+		// $dumpvars(0, testbench);
+		$monitor("%b", leds);
+	end
+
+	demo uut (
+		.clk  (clk  ),
+`ifdef POST_IMPL
+		.\leds[0]  (leds[0]),
+		.\leds[1]  (leds[1]),
+		.\leds[2]  (leds[2]),
+		.\leds[3]  (leds[3]),
+		.\leds[4]  (leds[4]),
+		.\leds[5]  (leds[5]),
+		.\leds[6]  (leds[6]),
+		.\leds[7]  (leds[7]),
+		.\leds[8]  (leds[8]),
+		.\leds[9]  (leds[9]),
+		.\leds[10] (leds[10]),
+		.\leds[11] (leds[11]),
+		.\leds[12] (leds[12]),
+		.\leds[13] (leds[13]),
+		.\leds[14] (leds[14]),
+		.\leds[15] (leds[15])
+`else
+		.leds(leds)
+`endif
+	);
+endmodule
-- 
2.30.2