1 files changed, 35 insertions, 0 deletions
diff --git a/nmigen_boards/_blinky.py b/nmigen_boards/_blinky.py
new file mode 100644
index 0000000..1e533ef
--- /dev/null
+++ b/nmigen_boards/_blinky.py
@@ -0,0 +1,35 @@
+import itertools
+
+from nmigen import *
+from nmigen.build import ConstraintError
+
+
+class Blinky(Elaboratable):
+    def elaborate(self, platform):
+        m = Module()
+
+        clk_name, clk_freq = next(iter(platform.clocks.items()))
+        clk = platform.request(*clk_name)
+        m.domains.sync = ClockDomain()
+        m.d.comb += ClockSignal().eq(clk.i)
+
+        leds = []
+        for n in itertools.count():
+            try:
+                leds.append(platform.request("user_led", n))
+            except ConstraintError:
+                break
+        leds = Cat(led.o for led in leds)
+
+        ctr = Signal(max=int(clk_freq//2), reset=int(clk_freq//2) - 1)
+        with m.If(ctr == 0):
+            m.d.sync += ctr.eq(ctr.reset)
+            m.d.sync += leds.eq(~leds)
+        with m.Else():
+            m.d.sync += ctr.eq(ctr - 1)
+
+        return m
+
+
+def build_and_program(platform_cls, **kwargs):
+    platform_cls().build(Blinky(), do_program=True, **kwargs)