Makefile.common

#########
#
# Common build targets
#
#

TOP ?= ../..
OBJDIR ?= $(TOP)/obj
LIBDIR ?= $(TOP)/lib
BINDIR ?= $(TOP)/bin

all: \
	$(TARGETS-y) \
	$(foreach O,$(BIN-y),$(BINDIR)/$O) \
	$(foreach O,$(LIB-y),$(LIBDIR)/$O) \

ifeq ($(shell uname -m),armv7l)
# We are on the BeagleBone Black itself;
# do not cross compile.
export CROSS_COMPILE:=

else
# We are not on the BeagleBone and might be cross compiling.
# If the environment does not set CROSS_COMPILE, set our
# own.  Install a cross compiler with something like:
#
# sudo apt-get install gcc-arm-linux-gnueabi
#
export CROSS_COMPILE?=arm-linux-gnueabi-
endif

GENERIC_CFLAGS += \
	-g \
	-W \
	-Wall \
	-D_BSD_SOURCE \
	-Wp,-MMD,$(dir $@).$(notdir $@).d \
	-Wp,-MT,$@ \
	-I. \
	-I$(TOP)/src/ledscape \
	-O2 \
	-mtune=cortex-a8 \
	-march=armv7-a \

CFLAGS += \
	-std=c99 \
	$(GENERIC_CFLAGS) \

CPPFLAGS += \
	$(GENERIC_CFLAGS) \

LDFLAGS += \

LDLIBS += \
	-L$(LIBDIR) \
	-lledscape \
	-lpthread \
	-lm \

COMPILE.c-o = $(CROSS_COMPILE)gcc $(CFLAGS) -c -o $@ $< 
COMPILE.cpp-o = $(CROSS_COMPILE)g++ $(CPPFLAGS) -c -o $@ $< 
COMPILE.a = $(CROSS_COMPILE)ar crv $@ $^ 
COMPILE.link = $(CROSS_COMPILE)g++ $(LDFLAGS) -o $@ $^ $(LDLIBS)

$(OBJDIR)/%.o: %.c
	$(COMPILE.c-o)
$(OBJDIR)/%.o: %.cpp
	$(COMPILE.cpp-o)

$(LIBDIR)/%.a:
	$(RM) $@
	$(COMPILE.a)

$(BINDIR)/%:
	$(COMPILE.link)


#####
#
# The TI "app_loader" is the userspace library for talking to
# the PRU and mapping memory between it and the ARM.
#
APP_LOADER_DIR ?= $(TOP)/am335x/app_loader
APP_LOADER_LIB := $(APP_LOADER_DIR)/lib/libprussdrv.a
CFLAGS += -I$(APP_LOADER_DIR)/include
LDLIBS += $(APP_LOADER_LIB)


#####
#
# The TI PRU assembler looks like it has macros and includes,
# but it really doesn't.  So instead we use cpp to pre-process the
# file and then strip out all of the directives that it adds.
# PASM also doesn't handle multiple statements per line, so we
# insert hard newline characters for every ; in the file.
#
PASM_DIR ?= $(TOP)/am335x/pasm
PASM := $(PASM_DIR)/pasm

$(LIBDIR)/%.bin: %.p $(PASM)
	$(CPP) - < $< | perl -p -e 's/^#.*//; s/;/\n/g; s/BYTE\((\d+)\)/t\1/g' > /tmp/$(basename $<).i
	$(PASM) -V3 -b /tmp/$(basename $<).i $(basename $@)
	$(RM) /tmp/$(basename $<).i

#
# Generate a target for each of the binaries, with dependencies on
# object files for that source.
#
$(foreach O,$(BIN-y),\
	$(eval $(BINDIR)/$O: $(foreach s,$($O.srcs),$(OBJDIR)/$(basename $s).o) $(LIBDIR)/libledscape.a))

$(foreach O,$(LIB-y),\
	$(eval $(LIBDIR)/$O: $(foreach s,$($(basename $O).srcs),$(OBJDIR)/$(basename $s).o) $(APP_LOADER_LIB)))

#$(TARGETS):
	#$(COMPILE.link)


.PHONY: clean

# Include all of the generated dependency files
-include $(OBJDIR)/.*.o.d

clean:
	rm -rf \
		$(OBJDIR)/*.o \
		$(LIBDIR)/*.a \
		$(OBJDIR)/.*.o.d \
		$(LIBDIR)/*.bin \


###########
# 
# The correct way to reserve the GPIO pins on the BBB is with the
# capemgr and a Device Tree file.  But it doesn't work.
#
SLOT_FILE=/sys/devices/bone_capemgr.9/slots
DTS=CAPE-BONE-OCTO
DTB=/lib/firmware/$(DTS)-00A0.dtbo

dts: LEDscape.dts
	@SLOT="`grep LEDSCAPE $(SLOT_FILE) | cut -d: -f1`"; \
	if [ ! -z "$$SLOT" ]; then \
		echo "Removing slot $$SLOT"; \
		echo -$$SLOT > $(SLOT_FILE); \
	fi
	dtc -O dtb -o /lib/firmware/BB-LEDSCAPE-00A0.dtbo -b 0 -@ LEDscape.dts
	echo BB-LEDSCAPE > $(SLOT_FILE)



firmware: $(DTB)
	echo $(DTS) > $(SLOT_FILE)

$(DTB): cape-bone-octo.dts FORCE
	dtc -O dtb -o $@ -b 0 -@ $<
FORCE:

###########
# 
# PRU Libraries and PRU assembler are build from their own trees.
# 
$(APP_LOADER_LIB):
	$(MAKE) -C $(APP_LOADER_DIR)/interface

$(PASM):
	$(MAKE) -C $(PASM_DIR)