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AVR Makefile

Support for projects based on AVR microcontrollers. Makefile automatically finds source files and detects their dependencies. Which is a great companion to life.

Installation on GNU/Linux

# my project template requires the following packages to be installed correctly:
# GCC compiler adapted for AVR architecture
sudo aptitude install gcc-avr
# basic libraries for AVR
sudo aptitude install avr-libc
# binary utilities
sudo aptitude install binutils-avr
# GNU make utility
sudo aptitude install make

Use

# compiling the project, equivalen to make
make all
# flash content
make flash
# deletes the compilation outputs
make clean
# start avrdude terminal
make terminal
# EEPROM dump_eeprom
make dump_eeprom
# flash all (flash, EEPROM)
make flash_all
# chip testing
make chip_test

Application notes

File Template Hierarchy

.
├── bin
│   └── Makefile
├── inc
│   ├── settings.h
│   └── uart.h
├── LICENSE
├── Makefile
├── README.md
└── src
    ├── asm-fnc.S
    ├── main.c
    ├── rand.S
    └── uart.c

3 directories, 10 files

The source files *.c and *.S are located in the src/ folder. Header files *.h are located in the inc/ folder. The compilation outputs (binary files *.hex, *.elf, code disassembler *.lss, dependency files *.list, batch files *.o) and secondary Makefile are located in the bin/ folder.

Change of frequency

The F_CPU [Hz] constant used for delay functions is defined in the settings.h file. The settings.h file must be plugged into all the files in which you want to use the constant. You can also add additional constants that affect the behavior of the entire program.

#ifndef F_CPU
  #define F_CPU 16000000UL // Hz
#endif

Microprocessor change

Changing the microcontroller requires changing the CHIP variable in the Makefile file and the MCU variable in the bin/ Makefile file.

The CHIP variable is a parameter for avrdude and may contain the following values: http://www.nongnu.org/avrdude/user-manual/avrdude_4.html

The MCU variable is a parameter for avr-gcc and may contain the following values: https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html

For example, if I wanted ATmega328P (which is for example in arduino nano), I would make the following modifications:

# in Makefile
CHIP = m328p
# in bin/Makefile
MCU = atmega328p

Programmer change

Changing the programmer will required change the value of PROG in Makefile. Possible parameters of the value that are passed to avrdude as -c are listed here: http://www.nongnu.org/avrdude/user-manual/avrdude_4.html

For example, if I wanted to use the arduino bootloader to flash the program, I would proceed as follows:

# in Makefile
PROG = arduino