From a27ca5617f144527b883cbf7e6f15d2dd7aafe2a Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Tue, 31 Mar 2009 22:30:36 +0000
Subject: Add macro to make it clear we expect 7-bit addresses

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1675 42af7a65-404d-4744-a932-0658087f49c3
---
 nuttx/include/nuttx/i2c.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'nuttx')

diff --git a/nuttx/include/nuttx/i2c.h b/nuttx/include/nuttx/i2c.h
index 7b7b1772c..96c3bf735 100644
--- a/nuttx/include/nuttx/i2c.h
+++ b/nuttx/include/nuttx/i2c.h
@@ -47,6 +47,11 @@
  * Definitions
  ****************************************************************************/
 
+/* I2C address calculation.  Convert 7-bit address to 8-bit read/write address */
+
+#define I2C_READADDR(a)  (((a) << 1) | 1)
+#define I2C_WRITEADDR(a)  ((a) << 1)
+
 /* Access macros */
 
 /****************************************************************************
-- 
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