From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Tue, 30 Oct 2018 09:15:29 +0000 (+0100)
Subject: gen: add common with reverse_bits/reverse_bytes functions
X-Git-Tag: 24jan2021_ls180~1530
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b7968538939bb5ec0ddc12d527c1c1e2eab49a2e;p=litex.git

gen: add common with reverse_bits/reverse_bytes functions
---

diff --git a/litex/gen/__init__.py b/litex/gen/__init__.py
index 7d751ff9..56a7f89f 100644
--- a/litex/gen/__init__.py
+++ b/litex/gen/__init__.py
@@ -1 +1,2 @@
 from litex.gen.sim import *
+from litex.gen.common import *
diff --git a/litex/gen/common.py b/litex/gen/common.py
new file mode 100644
index 00000000..4e3e1998
--- /dev/null
+++ b/litex/gen/common.py
@@ -0,0 +1,11 @@
+from migen import *
+
+
+def reverse_bits(s):
+    return s[::-1]
+
+
+def reverse_bytes(s):
+    n = (len(s) + 7)//8
+    return Cat(*[s[i*8:min((i + 1)*8, len(s))]
+        for i in reversed(range(n))])