From 7d74799011f28796bbb8165dc3bcd4c8cca12052 Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Sat, 16 Aug 2014 21:19:05 +0200
Subject: [PATCH] ds1307: Correctly handle address wrap-around.

---
 decoders/ds1307/pd.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/decoders/ds1307/pd.py b/decoders/ds1307/pd.py
index d9aa3d5..ca6faf6 100644
--- a/decoders/ds1307/pd.py
+++ b/decoders/ds1307/pd.py
@@ -187,7 +187,11 @@ class Decoder(srd.Decoder):
         r = self.reg if self.reg < 8 else 0x3f
         fn = getattr(self, 'handle_reg_0x%02x' % r)
         fn(b)
+        # Honor address auto-increment feature of the DS1307. When the
+        # address reaches 0x3f, it will wrap around to address 0.
         self.reg += 1
+        if self.reg > 0x3f:
+            self.reg = 0
 
     def decode(self, ss, es, data):
         cmd, databyte = data
-- 
2.30.2