Add multi-application support

Makefile

@@ -1,21 +1,23 @@
 .DEFAULT_GOAL := all
 
-PLATFORM ?= posix
+APPLICATION ?= button
 
-TARGET_FILE ?= firmware.elf
+PLATFORM ?= posix
+TARGET_FILE ?= $(APPLICATION).elf
 
 CC = $(CROSS_COMPILE)gcc
 CPP = $(CROSS_COMPILE)cpp
 OBJCOPY = $(CROSS_COMPILE)objcopy
 
 SRC_DIR = src
-OBJ_DIR = obj
-BIN_DIR = bin
+OBJ_DIR = obj/$(PLATFORM)
+BIN_DIR = bin/$(PLATFORM)
 
 CPP_FLAGS += $(addprefix -I, $(INCLUDES))
 
 C_SRCS = $(wildcard $(SRC_DIR)/*.c)
 C_SRCS += $(wildcard $(SRC_DIR)/platform/$(PLATFORM)/*.c)
+C_SRCS += $(wildcard $(SRC_DIR)/application/$(APPLICATION)/*.c)
 C_OBJS = $(patsubst $(SRC_DIR)%,$(OBJ_DIR)%,$(patsubst %.c,%.o,$(C_SRCS)))
 OBJS = $(NRF_A_OBJS) $(NRF_C_OBJS) $(C_OBJS)
 
@@ -46,14 +48,16 @@ clean:
 	rm -f $(OBJS) $(patsubst %.o,%.d,$(OBJS))
 
 distclean:
-	rm -rf $(OBJ_DIR) $(BIN_DIR)
+	rm -rf bin obj
 
 $(TARGET): $(OBJS) $(THIS_MAKEFILE)
 	@mkdir -p $(dir $@)
 	$(CC) $(CC_FLAGS) $(LD_FLAGS) $(OBJS) $(addprefix -l,$(LIBS)) -o $@
+	ln -sf $(shell pwd)/$@ $(shell pwd)/bin/firmware.elf
 
 $(TARGET_HEX): $(TARGET) $(THIS_MAKEFILE)
 	$(OBJCOPY) -O ihex $(TARGET) $(TARGET_HEX)
+	ln -sf $(shell pwd)/$@ $(shell pwd)/bin/firmware.hex
 
 $(OBJ_DIR)/%.d: $(SRC_DIR)/%.c
 	@mkdir -p $(dir $@)
@@ -63,6 +67,6 @@ $(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
 	@mkdir -p $(dir $@)
 	$(CC) -c $(CPP_FLAGS) $(C_FLAGS) $< -o $@
 
-ifneq ($(MAKECMDGOALS),clean)
+ifeq "$(findstring $(MAKECMDGOALS), clean distclean)" ""
 -include $(patsubst %.o,%.d,$(OBJS))
 endif