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# Paths: default pathnames if they are not
# passed on from parent Makefile.
ifndef TARGET
TARGET = main
endif
ifndef LIBDIR
LIBDIR = ../../../avr-lib
endif
ifndef SRCDIR
SRCDIR = ../src
endif
ifndef BIOSDIR
BIOSDIR = ../bios
endif
ifndef CFGDIR
CFGDIR = ..
endif

include $(BIOSDIR)/bios.inc

# VPATH: setup search path for source files.
vpath
vpath %.c $(LIBDIR):$(SRCDIR)

# List source files here. (C dependencies are automatically generated.)
SOURCES =   main.c\
            drivers/timer/timer.c\
            drivers/uart/serial.c\
            drivers/uart/uart.c\
            drivers/mcu/mcu.c\

# Optimization level, can be [0, 1, 2, 3, s]. 
# 0 = turn off optimization. s = optimize for size.
# (Note: 3 is not always the best optimization level. See avr-libc FAQ.)
OPT = s
#OPT = 3

# Debugging format.
# Native formats for AVR-GCC's -g are stabs [default], or dwarf-2.
# AVR (extended) COFF requires stabs, plus an avr-objcopy run.
DEBUG = stabs
#DEBUG = dwarf-2

# List any extra directories to look for include files here.
# Each directory must be separated by a space.
EXTRAINCDIRS = $(LIBDIR) $(BIOSDIR)

# Compiler flag to set the C Standard level.
# c89   - "ANSI" C
# gnu89 - c89 plus GCC extensions
# c99   - ISO C99 standard (not yet fully implemented)
# gnu99 - c99 plus GCC extensions
CSTANDARD = -std=gnu99

# Place -D or -U options here
CDEFS =

# Place -I options here
CINCS =


# Compiler flags.
#  -g*:          generate debugging information
#  -O*:          optimization level
#  -f...:        tuning, see GCC manual and avr-libc documentation
#  -Wall...:     warning level
#  -Wa,...:      tell GCC to pass this to the assembler.
#    -adhlns...: create assembler listing
CFLAGS = -mmcu=$(MCU) -I.
CFLAGS += -g$(DEBUG)
CFLAGS += $(CDEFS) $(CINCS)
CFLAGS += -O$(OPT)
CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
CFLAGS += -Wall -Wstrict-prototypes
CFLAGS += -Wa,-adhlns=$(@:.o=.lst)
CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
CFLAGS += $(CSTANDARD)



# Assembler flags.
#  -Wa,...:   tell GCC to pass this to the assembler.
#  -ahlms:    create listing
#  -gstabs:   have the assembler create line number information; note that
#             for use in COFF files, additional information about filenames
#             and function names needs to be present in the assembler source
#             files -- see avr-libc docs [FIXME: not yet described there]
##ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs 
ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp
ASFLAGS += -Wa,-adhlns=$(@:.o=.lst),-g$(DEBUG)


#Additional libraries.

# Minimalistic printf version
PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min

# Floating point printf version (requires MATH_LIB = -lm below)
PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt

PRINTF_LIB = 

# Minimalistic scanf version
SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min

# Floating point + %[ scanf version (requires MATH_LIB = -lm below)
SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt

SCANF_LIB = 

MATH_LIB = -lm

# External memory options

# 64 KB of external RAM, starting after internal RAM (ATmega128!),
# used for variables (.data/.bss) and heap (malloc()).
#EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff

# 64 KB of external RAM, starting after internal RAM (ATmega128!),
# only used for heap (malloc()).
#EXTMEMOPTS = -Wl,--defsym=__heap_start=0x801100,--defsym=__heap_end=0x80ffff

EXTMEMOPTS =

BIOSOPTS = -Wl,-L$(BIOSDIR),-Tdata,$(BIOS_RAM_END) -lbios

# Linker flags.
#  -Wl,...:     tell GCC to pass this to linker.
#    -Map:      create map file
#    --cref:    add cross reference to  map file
LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
LDFLAGS += $(EXTMEMOPTS)
LDFLAGS += $(BIOSOPTS)
LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)

# ---------------------------------------------------------------------------

# Define programs and commands.
SHELL = sh
CC = avr-gcc
AWK = awk
OBJCOPY = avr-objcopy
OBJDUMP = avr-objdump
SIZE = avr-size
NM = avr-nm
RM = rm -f
CP = cp
MKDIR = mkdir



# Define Messages
# English
MSG_ERRORS_NONE = Errors: none
MSG_BEGIN = -------- begin --------
MSG_END = --------  end  --------
MSG_SIZE_BEFORE = Size before: 
MSG_SIZE_AFTER = Size after:
MSG_COFF = Converting to AVR COFF:
MSG_EXTENDED_COFF = Converting to AVR Extended COFF:
MSG_FLASH = Creating load file for Flash:
MSG_EEPROM = Creating load file for EEPROM:
MSG_EXTENDED_LISTING = Creating Extended Listing:
MSG_SYMBOL_TABLE = Creating Symbol Table:
MSG_LINKING = Linking:
MSG_COMPILING = Compiling:
MSG_ASSEMBLING = Assembling:
MSG_DEPEND = Generating dependencies:
MSG_CLEANING = Cleaning project:
MSG_CREATE = Creating:

# Define all object files.
OBJ = $(filter %.o,$(SOURCES:.c=.o) $(SOURCES:.S=.o))

# Define all listing files.
LST = $(OBJ:.o=.lst)

# Define all dependency files.
DEP = $(OBJ:.o=.dep)

BUILDDIRS = $(sort $(filter-out ./,$(dir $(OBJ))))

# Compiler flags to generate dependency files.
### GENDEPFLAGS = -Wp,-M,-MP,-MT,$(*F).o,-MF,.dep/$(@F).d
GENDEPFLAGS = -M -MG -MP -MT "$(@:.d=.o) $@" -MF $@

# Default target.
all: sizebefore build sizeafter

build: elf hex eep lss sym

elf: $(TARGET).elf
hex: $(TARGET).hex
eep: $(TARGET).eep
lss: $(TARGET).lss 
sym: $(TARGET).sym

# Display size of file.
HEXSIZE = $(SIZE) --target=ihex $(TARGET).hex
ELFSIZE = $(SIZE) $(TARGET).elf
sizebefore:
    @if [ -f $(TARGET).elf ]; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); echo; fi

sizeafter:
    @if [ -f $(TARGET).elf ]; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); echo; fi

# Generate config.h from bios.inc and config.inc
config.h: $(BIOSDIR)/bios.inc $(CFGDIR)/config.inc
    @echo Generating $@
    @echo "/* This file is automatically generated. Do not edit. */\n" > $@
    @cat $^ | $(AWK) 'BEGIN { FS="="; print "#ifndef CONFIG_H_\n#define CONFIG_H_\n" } /^[^#].*=.*/ { print "#define "$$1,$$2 } END { print "\n#endif /*CONFIG_H_*/" }' >> $@

# Display compiler version information.
gccversion : 
    @$(CC) --version

# Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
COFFCONVERT=$(OBJCOPY) --debugging \
--change-section-address .data-0x800000 \
--change-section-address .bss-0x800000 \
--change-section-address .noinit-0x800000 \
--change-section-address .eeprom-0x810000 


coff: $(TARGET).elf
    @echo $(MSG_COFF) $(TARGET).cof
    @$(COFFCONVERT) -O coff-avr $< $(TARGET).cof

extcoff: $(TARGET).elf
    @echo $(MSG_EXTENDED_COFF) $(TARGET).cof
    @$(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof

# Create final output files (.hex, .eep) from ELF output file.
%.hex: %.elf
    @echo $(MSG_FLASH) $@
    @$(OBJCOPY) -j .text -j .data -O ihex $< $@

%.eep: %.elf
    @echo $(MSG_EEPROM) $@
    -$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
    --change-section-lma .eeprom=0 -O ihex $< $@

# Create extended listing file from ELF output file.
%.lss: %.elf
    @echo $(MSG_EXTENDED_LISTING) $@
    @$(OBJDUMP) -h -S $< > $@

# Create a symbol table from ELF output file.
%.sym: %.elf
    @echo $(MSG_SYMBOL_TABLE) $@
    @$(NM) -n $< > $@

# Link: create ELF output file from object files.
.SECONDARY : $(TARGET).elf
.PRECIOUS : $(OBJ)
ifneq (,$(filter atmega88 atmega168, $(MCU)))
%.elf: $(OBJ)
    @echo $(MSG_LINKING) $@
    @echo GCC bug workaround for ATmega88/ATmega168:
    @eval $$($(CC) -v $(CFLAGS) -o $@ $^ $(LDFLAGS) 2>&1 | $(AWK) '{ if (gsub("0x800100","$(BIOS_RAM_END)") == 1) print }')
else
%.elf: $(OBJ)
    @echo $(MSG_LINKING) $@
    @$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
endif

# Compile: create object files from C source files.
%.o : %.c
    @echo $(MSG_COMPILING) $<
    @$(CC) -c $(CFLAGS) $< -o $@ 

# Compile: create assembler files from C source files.
%.s : %.c
    @$(CC) -S $(CFLAGS) $< -o $@

# Assemble: create object files from assembler source files.
%.o : %.S
    @echo $(MSG_ASSEMBLING) $<
    $(CC) -c $(ASFLAGS) $< -o $@

# Depends: create dependency files from c source files.
%.dep : %.c | $(BUILDDIRS)
    @echo $(MSG_DEPEND) $<
    @$(CC) -c $(CFLAGS) $(GENDEPFLAGS) $<

# Buildtree: create directories for output files.
$(BUILDDIRS) :
    @echo $(MSG_CREATE) $@
    @$(MKDIR) -p $@

# Target: clean project.
clean: 
    @echo $(MSG_CLEANING)
    $(RM) $(TARGET).hex
    $(RM) $(TARGET).eep
    $(RM) $(TARGET).cof
    $(RM) $(TARGET).elf
    $(RM) $(TARGET).map
    $(RM) $(TARGET).sym
    $(RM) $(TARGET).lss
    $(RM) $(OBJ)
    $(RM) $(LST)
    $(RM) config.h

distclean: clean
    $(RM) -r $(BUILDDIRS)

# Include the dependency files.
-include $(DEP)

# Listing of phony targets.
.PHONY : all sizebefore sizeafter build \
elf hex eep lss sym coff extcoff clean \
distclean gccversion
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