From c63497a3630321a38595d99e8688db267e1661f1 Mon Sep 17 00:00:00 2001
From: vimalrajr <vimalraj.r@atmel.com>
Date: Tue, 11 Aug 2015 10:30:01 +0530
Subject: [PATCH] Added support for General Call Address mode.

---
 .../mbed/targets/hal/TARGET_Atmel/TARGET_SAM0/i2c_api.c  | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM0/i2c_api.c b/libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM0/i2c_api.c
index 73e01f7b07..dbd93226de 100644
--- a/libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM0/i2c_api.c
+++ b/libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM0/i2c_api.c
@@ -671,8 +671,13 @@ int  i2c_slave_receive(i2c_t *obj)
             /* Slave is read addressed */
             return 1;
         } else {
-            /* Slave is write addressed */
-            return 3;
+            if (!(i2c_module->DATA.reg & 0xFF)) {
+                /* General call address detected */
+                return 2;
+            } else {
+                /* Slave is write addressed */
+                return 3;
+            }
         }
     }