mbed library sources. Supersedes mbed-src. Edited target satm32f446 for user USART3 pins

Dependents:   IGLOO_board

Fork of mbed-dev by mbed official

Revision:
181:57724642e740
Parent:
172:7d866c31b3c5
--- a/targets/TARGET_NUVOTON/TARGET_M480/gpio_api.c	Wed Jan 17 15:23:54 2018 +0000
+++ b/targets/TARGET_NUVOTON/TARGET_M480/gpio_api.c	Fri Feb 16 16:09:33 2018 +0000
@@ -37,6 +37,11 @@
     return (uint32_t)(1 << pin_index);    // Return the pin mask
 }
 
+int gpio_is_connected(const gpio_t *obj)
+{
+    return (obj->pin != (PinName) NC);
+}
+
 void gpio_init(gpio_t *obj, PinName pin)
 {
     obj->pin = pin;