From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 27 Apr 2015 13:08:10 +0000 (+0200)
Subject: migen/genlib/misc: add reverse_bytes
X-Git-Tag: 24jan2021_ls180~2099^2~75
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e96ba1e46f8ff5db6dd769edc2b0716001369fdd;p=litex.git

migen/genlib/misc: add reverse_bytes
---

diff --git a/migen/genlib/misc.py b/migen/genlib/misc.py
index fc7528a6..f13b93c3 100644
--- a/migen/genlib/misc.py
+++ b/migen/genlib/misc.py
@@ -1,3 +1,5 @@
+import math
+
 from migen.fhdl.std import *
 from migen.fhdl.structure import _Operator
 
@@ -64,6 +66,14 @@ def chooser(signal, shift, output, n=None, reverse=False):
     return Case(shift, cases).makedefault()
 
 
+def reverse_bytes(signal):
+    n = math.ceil(flen(signal)/8)
+    r = []
+    for i in reversed(range(n)):
+        r.append(signal[i*8:min((i+1)*8, flen(signal))])
+    return Cat(iter(r))
+
+
 def timeline(trigger, events):
     lastevent = max([e[0] for e in events])
     counter = Signal(max=lastevent+1)