--- /dev/null
+#
+# AltOS build
+#
+#
+
+include ../samd21/Makefile.defs
+
+INC = \
+ ao.h \
+ ao_arch.h \
+ ao_arch_funcs.h \
+ ao_boot.h \
+ ao_companion.h \
+ ao_data.h \
+ ao_sample.h \
+ ao_pins.h \
+ altitude-pa.h \
+ ao_kalman.h \
+ ao_product.h \
+ ao_task.h \
+ ao_whiten.h \
+ samd21.h \
+ Makefile
+
+SAMD21_ROM=128
+SAMD21_RAM=16
+
+ALTOS_SRC = \
+ ao_boot_chain.c \
+ ao_interrupt.c \
+ ao_product.c \
+ ao_romconfig.c \
+ ao_cmd.c \
+ ao_config.c \
+ ao_task.c \
+ ao_stdio.c \
+ ao_storage.c \
+ ao_panic.c \
+ ao_timer.c \
+ ao_mutex.c \
+ ao_freq.c \
+ ao_dma_samd21.c \
+ ao_spi_samd21.c \
+ ao_data.c \
+ ao_bmi088.c \
+ ao_mmc5983.c \
+ ao_m25.c \
+ ao_adc_samd21.c \
+ ao_beep_samd21.c \
+ ao_usb_samd21.c \
+ ao_exti_samd21.c \
+ ao_convert_volt.c \
+ ao_report.c \
+ ao_sample.c \
+ ao_kalman.c \
+ ao_pyro.c \
+ ao_flight.c \
+ ao_ignite.c \
+ ao_log.c \
+ ao_log_timer.c \
+ $(PROFILE) \
+ $(SAMPLE_PROFILE) \
+ $(STACK_GUARD)
+
+PRODUCT=EasyTimer-v2
+PRODUCT_DEF=-DEASYTIMER_V_2
+IDPRODUCT=0x000d
+
+CFLAGS = $(PRODUCT_DEF) $(SAMD21_CFLAGS) $(PROFILE_DEF) $(SAMPLE_PROFILE_DEF) $(STACK_GUARD_DEF)
+
+PROGNAME=easytimer-v2
+PROG=$(PROGNAME)-$(VERSION).elf
+HEX=$(PROGNAME)-$(VERSION).ihx
+FLASH_PROG=flash-loader/$(PROGNAME)-altos-flash-$(VERSION).elf
+BOTH_HEX=$(PROGNAME)-combined-$(VERSION).ihx
+
+ELFTOHEX=$(TOPDIR)/../ao-tools/ao-elftohex/ao-elftohex
+
+SRC=$(ALTOS_SRC) ao_easytimer.c
+OBJ=$(SRC:.c=.o)
+
+all: $(PROG) $(HEX) $(BOTH_HEX)
+
+$(PROG): Makefile $(OBJ)
+ $(call quiet,CC) $(LDFLAGS) -o $(PROG) $(OBJ) $(LIBS)
+
+$(BOTH_HEX): $(PROG) $(FLASH_PROG)
+ $(ELFTOHEX) --nosym --output=$@ $(FLASH_PROG) $(PROG)
+
+$(OBJ): $(INC)
+
+
+$(FLASH_PROG): FRC
+ +cd flash-loader && make
+
+FRC:
+
+distclean: clean
+
+clean:
+ rm -f *.o $(PROGNAME)-*.elf $(PROGNAME)-*.ihx $(PROGNAME)-*.map
+ rm -f ao_product.h
+
+install:
+
+uninstall: