# Name: Makefile
# Project: USBaspLoader
# Author: Christian Starkjohann
# Creation Date: 2007-12-10
# Tabsize: 4
# Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
# License: GNU GPL v2 (see License.txt)
# This Revision: $Id: Makefile 798 2010-07-27 17:29:28Z cs $

###############################################################################
# Configure the following variables according to your AVR.
# Program the device with
#     make fuse    # to set the clock generator, boot section size etc.
#     make flash   # to load the boot loader into flash
#     make lock    # to protect the boot loader from overwriting

F_CPU = 8000000
DEVICE = attiny861

PROGRAMMER = -c usbasp -P usb
# PROGRAMMER contains AVRDUDE options to address your programmer

#---------------------------------------------------------------------
# ATMega8
#---------------------------------------------------------------------
# Fuse high byte:
# 0xc0 = 1 1 0 0   0 0 0 0 <-- BOOTRST (boot reset vector at 0x1800)
#        ^ ^ ^ ^   ^ ^ ^------ BOOTSZ0
#        | | | |   | +-------- BOOTSZ1
#        | | | |   + --------- EESAVE (preserve EEPROM over chip erase)
#        | | | +-------------- CKOPT (full output swing)
#        | | +---------------- SPIEN (allow serial programming)
#        | +------------------ WDTON (WDT not always on)
#        +-------------------- RSTDISBL (reset pin is enabled)
# Fuse low byte:
# 0x9f = 1 0 0 1   1 1 1 1
#        ^ ^ \ /   \--+--/
#        | |  |       +------- CKSEL 3..0 (external >8M crystal)
#        | |  +--------------- SUT 1..0 (crystal osc, BOD enabled)
#        | +------------------ BODEN (BrownOut Detector enabled)
#        +-------------------- BODLEVEL (2.7V)
#---------------------------------------------------------------------
# ATMega88, ATMega168
#---------------------------------------------------------------------
# Fuse extended byte:
# 0x00 = 0 0 0 0   0 0 0 0 <-- BOOTRST (boot reset vector at 0x1800)
#                    \+/
#                     +------- BOOTSZ (00 = 2k bytes)
# Fuse high byte:
# 0xd6 = 1 1 0 1   0 1 1 0
#        ^ ^ ^ ^   ^ \-+-/
#        | | | |   |   +------ BODLEVEL 0..2 (110 = 1.8 V)
#        | | | |   + --------- EESAVE (preserve EEPROM over chip erase)
#        | | | +-------------- WDTON (if 0: watchdog always on)
#        | | +---------------- SPIEN (allow serial programming)
#        | +------------------ DWEN (debug wire enable)
#        +-------------------- RSTDISBL (reset pin is enabled)
# Fuse low byte:
# 0xdf = 1 1 0 1   1 1 1 1
#        ^ ^ \ /   \--+--/
#        | |  |       +------- CKSEL 3..0 (external >8M crystal)
#        | |  +--------------- SUT 1..0 (crystal osc, BOD enabled)
#        | +------------------ CKOUT (if 0: Clock output enabled)
#        +-------------------- CKDIV8 (if 0: divide by 8)
#---------------------------------------------------------------------
# ATMega328P
#---------------------------------------------------------------------
# Fuse extended byte:
# 0x03 = - - - -   - 0 1 1
#                    \-+-/
#                      +------ BODLEVEL 0..2 (011 = 4.3V)
# Fuse high byte:
# 0xda = 1 1 0 1   1 0 1 0 <-- BOOTRST (0 = jump to bootloader at start)
#        ^ ^ ^ ^   ^ \+/
#        | | | |   |  +------- BOOTSZ 0..1 (01 = 2KB starting at 0x7800)
#        | | | |   + --------- EESAVE (don't preserve EEPROM over chip erase)
#        | | | +-------------- WDTON (1 = watchdog disabled at start)
#        | | +---------------- SPIEN (0 = allow serial programming)
#        | +------------------ DWEN (1 = debug wire disable)
#        +-------------------- RSTDISBL (1 = reset pin is enabled)
# Fuse low byte:
# 0xf7 = 1 1 1 1   0 1 1 1
#        ^ ^ \ /   \--+--/
#        | |  |       +------- CKSEL 3..0 (0111 = external full-swing crystal)
#        | |  +--------------- SUT 1..0 (11 = startup time 16K CK/14K + 65ms)
#        | +------------------ CKOUT (1 = clock output disabled)
#        +-------------------- CKDIV8 (1 = do not divide clock by 8)


###############################################################################

# Tools:
AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE)
CC = avr-gcc

# Options:
DEFINES = -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) #-DDEBUG_LEVEL=2

# Remove the -fno-* options when you use gcc 3, it does not understand them
CFLAGS = -Wall -Os -Os -mcall-prologues -I. $(DEFINES)
# -fno-move-loop-invariants -fno-tree-scev-cprop -fno-inline-small-functions 

LDFLAGS = -Wl,--relax,--gc-sections -Wl

OBJECTS =  main.o suart.o

# symbolic targets:
all: main.hex

.c.o:
	$(CC) $(CFLAGS) -c $< -o $@

.S.o:
	$(CC) $(CFLAGS) -x assembler-with-cpp -c $< -o $@
# "-x assembler-with-cpp" should not be necessary since this is the default
# file type for the .S (with capital S) extension. However, upper case
# characters are not always preserved on Windows. To ensure WinAVR
# compatibility define the file type manually.

.c.s:
	$(CC) $(CFLAGS) -S $< -o $@

flash:	all
	$(AVRDUDE) -U flash:w:main.hex:i

readflash:
	$(AVRDUDE) -U flash:r:read.hex:i

fuse:
	$(AVRDUDE) $(FUSEOPT)

lock:
	$(AVRDUDE) $(LOCKOPT)

read_fuses:
	$(UISP) --rd_fuses

clean:
	rm -f main.hex main.bin *.o *.s

# file targets:
main.bin:	$(OBJECTS)
	$(CC) $(CFLAGS) -o main.bin $(OBJECTS) $(LDFLAGS)

main.hex:	main.bin
	rm -f main.hex main.eep.hex
	avr-objcopy -j .text -j .data -O ihex main.bin main.hex
	avr-size main.hex

disasm:	main.bin
	avr-objdump -d main.bin

cpp:
	$(CC) $(CFLAGS) -E main.c