From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Thu, 8 Mar 2012 14:34:08 +0000 (+0100)
Subject: sim: fix zero encoding
X-Git-Tag: 24jan2021_ls180~2099^2~985
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=678a89d5722fe9eb1f36aa6733c0f50076841615;p=litex.git

sim: fix zero encoding
---

diff --git a/migen/sim/ipc.py b/migen/sim/ipc.py
index 5d9f9eb6..f463dcff 100644
--- a/migen/sim/ipc.py
+++ b/migen/sim/ipc.py
@@ -51,11 +51,14 @@ message_classes = [MessageTick, MessageGo, MessageWrite, MessageRead, MessageRea
 #
 
 def _pack_int(v):
-	p = []
-	while v != 0:
-		p.append(v & 0xff)
-		v >>= 8
-	p.insert(0, len(p))
+	if v == 0:
+		p = [1, 0]
+	else:
+		p = []
+		while v != 0:
+			p.append(v & 0xff)
+			v >>= 8
+		p.insert(0, len(p))
 	return p
 
 def _pack_str(v):