From fa210942845ca223db9dd8027c0ec88a3c84cfca Mon Sep 17 00:00:00 2001
From: Dmitry Bogdanov <dbogdan@mera.ru>
Date: Fri, 8 May 2015 20:21:14 +0400
Subject: [PATCH] backport of Issue: Pinology #808

---
 .../mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_api.c     | 3 +++
 .../mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_object.h  | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_api.c b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_api.c
index fd9c29b528..2678dfdaa5 100644
--- a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_api.c
+++ b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_api.c
@@ -29,6 +29,9 @@ void gpio_init(gpio_t *obj, PinName pin) {
     if (pin == (PinName)NC)
         return;
     obj->pin = pin;
+    if (pin == (PinName)NC)
+        return;
+
     obj->mask = gpio_set(pin);
     
     LPC_GPIO_TypeDef *port_reg = (LPC_GPIO_TypeDef *) ((int)pin & ~0x1F);
diff --git a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_object.h b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_object.h
index f149950b16..291dfb848e 100644
--- a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_object.h
+++ b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC2460/gpio_object.h
@@ -48,6 +48,10 @@ static inline int gpio_read(gpio_t *obj) {
     return ((*obj->reg_in & obj->mask) ? 1 : 0);
 }
 
+static inline int gpio_is_connected(const gpio_t *obj) {
+    return obj->pin != (PinName)NC;
+}
+
 #ifdef __cplusplus
 }
 #endif