modified Makefile for linux programming

Makefile

+#	This is a Makefile for AVR KURS,
+#	attempting to provide support for compiling and flashing AtTiny817 from Linux (2017-03-07)
+#	Author: magne.hov@gmail.com
+#	
+#	Guide for programming AVR AtTiny817 in Linux  
+#		To compile for AVR AtTiny817 we need some utilities for AVR, install these:
+#			'sudo apt-get install gcc-avr binutils-avr gdb-avr avr-libc' for aptitude distros
+#			or 'pacman -S gcc-avr binutils-avr gdb-avr avr-libc' for Arch distro
+#
+#			We also need an Atmel AtTiny Series Device Support package, which cannot easily
+#			be extracted on Linux and is easiest copied from a friend or AVR kurs studass.
+#			If copying from Windows, the Attiny folder should be located somewhere like this:
+#  			"C:\Program Files (x86)\Atmel\Studio\7.0\packs\atmel\Attiny_DFP\1.2.112" ...
+#  			... after being unpacked by Atmel Studio.
+#			Make sure to put this package at the place where DFP_DIR in this file is directed
+#
+#		To program the AtTiny on Linux, an unofficial tool called pyUPDI can be used.
+#			It can be downloaded from https://github.com/mraardvark/pyupdi through git:
+#			'git clone https://github.com/mraardvark/pyupdi'
+#			in f.ex /home/user/repos.
+#
+#		pyUPDI depends on python 2.7, and some python 2.7 packages, install these with
+#			'pip2 install pyserial intelhex'
+#			Note: if you don't have pip2, install it with
+#				'sudo apt-get install python-pip' for aptitude repos etc.
+#				or 'sudo pacman -S python2-pip' for Arch etc.
+#
+#		Remember to edit HOME_DIR in this file to point to your home directory, and to modifiy
+#		DFP_DIR and PYUPDI_DIR in this file to point to the directories where you placed the 
+#		Support package and pyUPDI.
+#
+#		When all of these dependencies are taken care of, you should be able to run 'sudo make' from the folder with the source files and MakeFile.
+
+# ###
+# Dependency directories and binaries
+HOME_DIR = /home/magne/
+DFP_DIR = $(HOME_DIR)avr/dfp/1.2.112/
+PYUPDI_DIR = $(HOME_DIR)repos/pyupdi/
+
+AVR-GCC = avr-gcc
+AVR-OBJCOPY = avr-objcopy
+
+# ####
+# Project files and flags
+
+#Source files, add more files to SRC if needed: main.c uart.c ...
+SRC = main.c
+OBJ = $(SRC:.c=.o)
+
+#Target name
+TARGET = out
+
+#Compiler and Linker flags
+MCU = attiny817
+CFLAGS = -B $(DFP_DIR)gcc/dev/attiny817 -I $(DFP_DIR)include -mmcu=$(MCU) -Os
+LDFLAGS = -B $(DFP_DIR)gcc/dev/attiny817 -I $(DFP_DIR)include -mmcu=$(MCU) #-Wl,-Map=$(TARGET).map
+
+# ####
+# Make rules
+all: compile flash clean
+
+compile: $(TARGET).hex
+
+flash: compile
+	python2 $(PYUPDI_DIR)pyupdi.py /dev/ttyACM0 tiny817 $(TARGET).hex
+
+clean:
+	rm -f $(OBJ) $(TARGET).{elf,hex}
+
+# ####
+# Compiler rules
+%.hex: %.elf
+	$(AVR-OBJCOPY) -O ihex -R .eeprom -R .fuse -R .lock -R .signature $< $@
+
+%.elf: $(OBJ)
+	$(AVR-GCC) $^ $(LDFLAGS) -o $@
+
+%.o : %.c
+	$(AVR-GCC) $(CFLAGS) -o $@ -c $<

Session1/Task1/Makefile

-#	This is a Makefile for AVR KURS,
-#	attempting to provide support for compiling and flashing from Linux
-
-# CHANGE THIS TO THE FOLDER YOU PUT YOUR DOWNLOADS IN
-#  The avr_toolchain and DFP folders should be put in the following defined folder
-DOWNLOAD_DIR=/home/magne/avr/
-
-# WHERE GET THIS? 
-#  This toolchain package can be downloaded from Atmel:
-#  http://www.atmel.com/tools/ATMELAVRTOOLCHAINFORLINUX.aspx
-#  
-AVR8_TOOLS_DIR=$(DOWNLOAD_DIR)atmel_avr_toolchain/
-
-# WHERE GET THIS?
-#  This DPF folder can be found in the 
-#  Atmel ATtiny Series Device Support (1.2.112)
-#  AtPack downloaded from:
-#  http://packs.download.atmel.com/
-#
-#  However, the AtPack must be unpacked by Atmel Studio (read: Windows.exe),
-#  so it is best transferred from a friend. [ INCLUDE A DOWNLOAD ON THE COURSE PAGE? ]
-#  In this case, the Attiny folder should be located somewhere like this:
-#  "C:\Program Files (x86)\Atmel\Studio\7.0\packs\atmel\Attiny_DFP\1.2.112" ...
-#  ... after being unpacked by Atmel Studio.
-#
-DFP_DIR=$(DOWNLOAD_DIR)dfp/1.2.112/
-
-# The important options for avr-gcc are
-# -B directory for spec-file folder from DFP pcakage
-# -I directory for includes from DFP package
-# -mmcu device id
-# -o output file [in HEX ??]
-compile:
-	$(AVR8_TOOLS_DIR)bin/avr-gcc -B $(DFP_DIR)gcc/dev/attiny817 -I $(DFP_DIR)include -mmcu=attiny817 -Os -o task1.hex main.c
-
-# and here make some rules for flashing through pyupdi