11 files changed, 126 insertions, 0 deletions
diff --git a/ice40/examples/blinky/blinky.pcf b/ice40/examples/blinky/blinky.pcf
new file mode 100644
index 00000000..141dfcc8
--- /dev/null
+++ b/ice40/examples/blinky/blinky.pcf
@@ -0,0 +1,6 @@
+set_io led1 99
+set_io led2 98
+set_io led3 97
+set_io led4 96
+set_io led5 95
+set_io clki 21
diff --git a/ice40/examples/blinky/blinky.proj b/ice40/examples/blinky/blinky.proj
new file mode 100644
index 00000000..f5bb9f88
--- /dev/null
+++ b/ice40/examples/blinky/blinky.proj
@@ -0,0 +1,15 @@
+{
+    "project": {
+        "version": "1",
+        "name": "blinky",
+        "arch": {
+            "name": "ice40",
+            "type": "hx1k",
+            "package": "tq144"
+        },
+        "input": {
+            "json": "blinky.json",
+            "pcf": "blinky.pcf"
+        }
+    }
+}
diff --git a/ice40/examples/blinky/blinky.sh b/ice40/examples/blinky/blinky.sh
new file mode 100755
index 00000000..a2326fc3
--- /dev/null
+++ b/ice40/examples/blinky/blinky.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+set -ex
+yosys blinky.ys
+../nextpnr-ice40 --json blinky.json --pcf blinky.pcf --asc blinky.asc
+icepack blinky.asc blinky.bin
+icebox_vlog blinky.asc > blinky_chip.v
+iverilog -o blinky_tb blinky_chip.v blinky_tb.v
+vvp -N ./blinky_tb
diff --git a/ice40/examples/blinky/blinky.v b/ice40/examples/blinky/blinky.v
new file mode 100644
index 00000000..36eaee86
--- /dev/null
+++ b/ice40/examples/blinky/blinky.v
@@ -0,0 +1,27 @@
+module blinky (
+    input  clki,
+    output led1,
+    output led2,
+    output led3,
+    output led4,
+    output led5
+);
+
+    SB_GB clk_gb (
+        .USER_SIGNAL_TO_GLOBAL_BUFFER(clki),
+        .GLOBAL_BUFFER_OUTPUT(clk)
+    );
+
+    localparam BITS = 5;
+    localparam LOG2DELAY = 21;
+
+    reg [BITS+LOG2DELAY-1:0] counter = 0;
+    reg [BITS-1:0] outcnt;
+
+    always @(posedge clk) begin
+        counter <= counter + 1;
+        outcnt <= counter >> LOG2DELAY;
+    end
+
+    assign {led1, led2, led3, led4, led5} = outcnt ^ (outcnt >> 1);
+endmodule
diff --git a/ice40/examples/blinky/blinky.ys b/ice40/examples/blinky/blinky.ys
new file mode 100644
index 00000000..a5dd2c85
--- /dev/null
+++ b/ice40/examples/blinky/blinky.ys
@@ -0,0 +1,3 @@
+read_verilog blinky.v
+synth_ice40 -top blinky
+write_json blinky.json
diff --git a/ice40/examples/blinky/blinky_tb.v b/ice40/examples/blinky/blinky_tb.v
new file mode 100644
index 00000000..f80b5e64
--- /dev/null
+++ b/ice40/examples/blinky/blinky_tb.v
@@ -0,0 +1,25 @@
+module blinky_tb;
+    reg clk;
+    always #5 clk = (clk === 1'b0);
+
+    wire led1, led2, led3, led4, led5;
+
+    chip uut (
+        .io_0_8_1(clk),
+        .io_13_12_1(led1),
+        .io_13_12_0(led2),
+        .io_13_11_1(led3),
+        .io_13_11_0(led4),
+        .io_13_9_1(led5)
+    );
+
+    initial begin
+        // $dumpfile("blinky_tb.vcd");
+        // $dumpvars(0, blinky_tb);
+        repeat (10) begin
+            repeat (900000) @(posedge clk);
+            $display(led1, led2, led3, led4, led5);
+        end
+        $finish;
+    end
+endmodule
diff --git a/ice40/examples/floorplan/.gitignore b/ice40/examples/floorplan/.gitignore
new file mode 100644
index 00000000..d93659be
--- /dev/null
+++ b/ice40/examples/floorplan/.gitignore
@@ -0,0 +1,4 @@
+*.json
+*.asc
+*.bin
+__pycache__
+\ No newline at end of file
diff --git a/ice40/examples/floorplan/floorplan.py b/ice40/examples/floorplan/floorplan.py
new file mode 100644
index 00000000..85c53ccd
--- /dev/null
+++ b/ice40/examples/floorplan/floorplan.py
@@ -0,0 +1,5 @@
+ctx.createRectangularRegion("osc", 1, 1, 1, 4)
+for cell, cellinfo in ctx.cells:
+    if "ringosc" in cellinfo.attrs:
+        print("Floorplanned cell %s" % cell)
+        ctx.constrainCellToRegion(cell, "osc")
diff --git a/ice40/examples/floorplan/floorplan.sh b/ice40/examples/floorplan/floorplan.sh
new file mode 100755
index 00000000..e0ed7a64
--- /dev/null
+++ b/ice40/examples/floorplan/floorplan.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -ex
+yosys -p "synth_ice40 -top top -json floorplan.json" floorplan.v
+../../../nextpnr-ice40 --up5k --json floorplan.json --pcf icebreaker.pcf --asc floorplan.asc --ignore-loops --pre-place floorplan.py
+icepack floorplan.asc floorplan.bin
+iceprog floorplan.bin
diff --git a/ice40/examples/floorplan/floorplan.v b/ice40/examples/floorplan/floorplan.v
new file mode 100644
index 00000000..8f99ed4e
--- /dev/null
+++ b/ice40/examples/floorplan/floorplan.v
@@ -0,0 +1,22 @@
+module top(output LED1, LED2, LED3, LED4, LED5);
+    localparam N = 31;
+    wire [N:0] x;
+    assign x[0] = x[N];
+
+    genvar ii;
+    generate
+
+    for (ii = 0; ii < N; ii = ii + 1) begin
+        (* ringosc *)
+        SB_LUT4 #(.LUT_INIT(1)) lut_i(.I0(x[ii]), .I1(), .I2(), .I3(), .O(x[ii+1]));
+    end
+    endgenerate
+
+    assign clk = x[N];
+
+
+    reg [19:0] ctr;
+    always @(posedge clk)
+        ctr <= ctr + 1'b1;
+    assign {LED5, LED4, LED3, LED2, LED1} = ctr[19:15];
+endmodule
diff --git a/ice40/examples/floorplan/icebreaker.pcf b/ice40/examples/floorplan/icebreaker.pcf
new file mode 100644
index 00000000..ac7ebf9e
--- /dev/null
+++ b/ice40/examples/floorplan/icebreaker.pcf
@@ -0,0 +1,5 @@
+set_io -nowarn LED1       26
+set_io -nowarn LED2       27
+set_io -nowarn LED3       25
+set_io -nowarn LED4       23
+set_io -nowarn LED5       21