Added examples/gowin/

examples/gowin/.gitignore

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+demo.bit
+demo.out
+demo.rpt
+demo_syn.v
+demo_out.v
+demo_tr.html

examples/gowin/README

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+Simple test project for Gowinsemi GW2A-55K Eval Board Mini.
+
+Follow the install instructions for the Gowinsemi tools below,
+then run "bash run.sh" in this directory.
+
+
+Install instructions for gowinTool_linux
+----------------------------------------
+
+1.) extract gowinTool_linux.zip
+
+2.) set GOWIN_HOME env variable to the full path to the
+gowinTool_linux directory
+
+3.) edit gowinTool_linux/bin/gwlicense.ini. Set lic="..." to
+the full path to the license file.
+

examples/gowin/demo.cst

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+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;

examples/gowin/demo.sdc

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+create_clock -name clk -period 20 -waveform {0 10} [get_ports {clk}]

examples/gowin/demo.v

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+module demo (
+	input clk,
+	output led1, led2, led3, led4, led5, led6, led7, led8,
+	output led9, led10, led11, led12, led13, led14, led15, led16
+);
+	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];
+endmodule

examples/gowin/run.sh

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+#!/bin/bash
+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