Added object extensions configuration parameter to HAL

Author: AGlass0fMilk

hal/mbed_lib.json

@@ -0,0 +1,9 @@
+{
+    "name": "hal",
+    "config": {
+	"enable-objects-extensions": {
+	    "help": "Enable inclusion of objects_extensions.h",
+	    "value": false
+	}
+    }
+}

targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/TARGET_NRF52840_DK/device.h

@@ -18,21 +18,18 @@
 #ifndef MBED_DEVICE_H
 #define MBED_DEVICE_H
 
-
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 #include "objects.h"
 
+/**
+ * This allows applications and external libraries to provide
+ * structs typically included in objects.h
+ *
+ * Useful if a chip doesn't have a certain peripheral (eg: CAN) but
+ * can be equipped with one by external hardware (eg: CAN via SPI). This allows
+ * the standard APIs to be used without any extra hacks.
+ */
+#if MBED_CONF_HAL_ENABLE_OBJECTS_EXTENSIONS
+#include "objects_extensions.h"
+#endif
+
 #endif