From 1476f044e6e75c368df55ef8550db6fe7a780350 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Thu, 1 Mar 2012 15:21:13 +1100
Subject: [PATCH] I2C: added lockup_count() interface

used for reporting I2C problems
---
 libraries/I2C/I2C.cpp | 6 ++++++
 libraries/I2C/I2C.h   | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/libraries/I2C/I2C.cpp b/libraries/I2C/I2C.cpp
index 2b699b8cc8..254670138f 100644
--- a/libraries/I2C/I2C.cpp
+++ b/libraries/I2C/I2C.cpp
@@ -536,6 +536,12 @@ void I2C::lockUp()
 {
   TWCR = 0; //releases SDA and SCL lines to high impedance
   TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA); //reinitialize TWI
+  _lockup_count++;
+}
+
+uint8_t I2C::lockup_count(void)
+{
+	return _lockup_count;
 }
 
 SIGNAL(TWI_vect)
diff --git a/libraries/I2C/I2C.h b/libraries/I2C/I2C.h
index ca957312ad..0400b39e03 100644
--- a/libraries/I2C/I2C.h
+++ b/libraries/I2C/I2C.h
@@ -97,6 +97,7 @@ class I2C
     uint8_t read(uint8_t, uint8_t, uint8_t*);
     uint8_t read(uint8_t, uint8_t, uint8_t, uint8_t*);
     uint8_t receive();
+    uint8_t lockup_count();
 
   private:
     uint8_t start();
@@ -108,6 +109,8 @@ class I2C
     uint8_t returnStatus;
     uint8_t nack;
     uint8_t data[MAX_BUFFER_SIZE];
+    uint8_t _lockup_count;
+
     static uint8_t bytesAvailable;
     static uint8_t bufferIndex;
     static uint8_t totalBytes;