From b751d79bf5955eaba36d5372b80b08bdb42617dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cenk=20G=C3=BCndo=C4=9Fan?= <cnkgndgn@gmail.com>
Date: Thu, 4 Feb 2016 13:58:03 +0100
Subject: [PATCH] boards: samr21-xpro: add user button gpio

---
 boards/samr21-xpro/include/board.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/boards/samr21-xpro/include/board.h b/boards/samr21-xpro/include/board.h
index 05e4a65168..1ad52c77cc 100644
--- a/boards/samr21-xpro/include/board.h
+++ b/boards/samr21-xpro/include/board.h
@@ -77,6 +77,15 @@ extern "C" {
 #define LED_RED_TOGGLE      LED_TOGGLE
 /** @} */
 
+/**
+ * @name SW0 (Button) pin definitions
+ * @{
+ */
+#define BUTTON_PORT         PORT->Group[0]
+#define BUTTON_PIN          (28)
+#define BUTTON_GPIO         GPIO_PIN(0, BUTTON_PIN)
+/** @} */
+
 /**
  * @brief Initialize board specific hardware, including clock, LEDs and std-IO
  */