gen: add common with reverse_bits/reverse_bytes functions

diff --git a/litex/gen/__init__.py b/litex/gen/__init__.py
index 7d751ff9bd58109a864292da16fccf9ebdde347f..56a7f89fa50cb84d4a393d151629406bda32c2e3 100644 (file)
--- 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 (file)
index 0000000..4e3e199
--- /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))])