build: added makefile wrappers for px4 or AVR build

mk/apm.mk

@@ -0,0 +1,28 @@
+# find the mk/ directory, which is where this makefile fragment
+# lives
+MK_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
+
+ifeq ($(APPDIR),)
+
+####################
+# AVR and SITL build
+
+
+include $(MK_DIR)/Arduino.mk
+include $(MK_DIR)/targets.mk
+
+else
+
+####################
+# PX4 build
+APPNAME		 = ArduPlane
+PRIORITY	 = SCHED_PRIORITY_DEFAULT
+STACKSIZE	 = 4096
+
+SKETCHBOOK=..
+include $(APPDIR)/mk/apm.mk
+
+endif
+
+# these targets need to be outside the APPDIR if above
+include $(MK_DIR)/px4_targets.mk

mk/px4_targets.mk

@@ -0,0 +1,14 @@
+# PX4 build is via external build system
+
+ifneq ($(PX4_ROOT),)
+
+px4:
+	make -C $(PX4_ROOT) EXTERNAL_APPS=$(PWD)
+
+px4-clean:
+	make -C $(PX4_ROOT) EXTERNAL_APPS=$(PWD) clean
+
+px4-upload:
+	make -C $(PX4_ROOT) EXTERNAL_APPS=$(PWD) upload
+
+endif