_blinky→test.blinky

Expose blinky as a stable component, to make writing out-of-tree
board files a bit nicer.

1 files changed, 30 insertions, 0 deletions

diff --git a/nmigen_boards/test/blinky.py b/nmigen_boards/test/blinky.py
new file mode 100644
index 0000000..5e20191
--- /dev/null
+++ b/nmigen_boards/test/blinky.py
@@ -0,0 +1,30 @@
+import itertools
+
+from nmigen import *
+from nmigen.build import ResourceError
+
+
+__all__ = ["Blinky"]
+
+
+class Blinky(Elaboratable):
+    def elaborate(self, platform):
+        m = Module()
+
+        leds = []
+        for n in itertools.count():
+            try:
+                leds.append(platform.request("led", n))
+            except ResourceError:
+                break
+        leds = Cat(led.o for led in leds)
+
+        clk_freq = platform.default_clk_frequency
+        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