From 53972f12b69a4979fb2f09d05c6661702eddf952 Mon Sep 17 00:00:00 2001
From: Marti Bolivar <mbolivar@leaflabs.com>
Date: Wed, 19 Nov 2014 22:38:37 -0500
Subject: Wire: release the bus on error

---
 libraries/Wire/Wire.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/Wire/Wire.cpp b/libraries/Wire/Wire.cpp
index d646132..b08023d 100644
--- a/libraries/Wire/Wire.cpp
+++ b/libraries/Wire/Wire.cpp
@@ -128,6 +128,7 @@ uint8 TwoWire::process() {
     // shift out the address we're transmitting to
     i2c_shift_out(sla_addr);
     if (!i2c_get_ack()) {
+        i2c_stop();             // Fix up the state of the bus
         return ENACKADDR;
     }
     // Recieving
@@ -146,6 +147,7 @@ uint8 TwoWire::process() {
         for (uint8 i = 0; i < itc_msg.length; i++) {
             i2c_shift_out(itc_msg.data[i]);
             if (!i2c_get_ack()) {
+                i2c_stop();     // Fix up the state of the bus
                 return ENACKTRNS;
             }
             itc_msg.xferred++;
-- 
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