migen.diff

diff --git a/src/modules/ws2812.py b/src/modules/ws2812.py
index d369f16..d716201 100644
--- a/src/modules/ws2812.py
+++ b/src/modules/ws2812.py
@@ -64,12 +64,16 @@ class Ws2812Phy:

         max_pattern_length = max([sum(pattern) for pattern in self.patterns])
         counter = Signal(max=max_pattern_length)
+
+        dummy = Signal(max = len(self.patterns))
+        m.d.comb += buffered_pattern.eq(dummy)
+
         with m.If(counter == self.patterns[buffered_pattern][1]):
             m.d.sync += [
                 counter.eq(0),
                 self.done.eq(1),

-                buffered_pattern.eq(self.pattern),
+                dummy.eq(self.pattern),
             ]
         with m.Else():
             m.d.sync += [