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Arduino-Makefile/arduino-mk-vars.md
Tokita Hiroshi e482e6fbc7 Add -DARDUINO_{build.board} for compile options
2020-09-15 12:57:05 +09:00

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# Documentation of variables
The following are the different variables that can be overwritten in the user makefiles.
* [Global variables](#global-variables)
* [Installation/Directory variables](#installationdirectory-variables)
* [Arduino IDE variables](#arduino-ide-variables)
* [Sketch related variables](#sketch-related-variables)
* [ISP programming variables](#isp-programming-variables)
* [Compiler/Executable variables](#compilerexecutable-variables)
* [Avrdude setting variables](#avrdude-setting-variables)
* [Bootloader variables](#bootloader-variables)
* [ChipKIT variables](#chipkit-variables)
* [ARM variables](#arm-variables)
* [Ctags variables](#ctags-variables)
## Global variables
### ARDUINO_QUIET
**Description:**
Suppress printing of Arduino-Makefile configuration.
Defaults to `0` (unset/disabled).
**Example:**
```Makefile
ARDUINO_QUIET = 1
```
**Requirement:** *Optional*
----
## Installation/Directory variables
### ARDMK_DIR
**Description:**
Directory where the `*.mk` files are stored.
Usually can be auto-detected as parent of `Arduino.mk`.
**Example:**
```Makefile
ARDMK_DIR = /usr/share/arduino
```
**Requirement:** *Optional*
----
### AVR_TOOLS_DIR
**Description:**
Directory where tools such as `avrdude`, `avr-g++`, `avr-gcc`, etc. are stored in the `bin/` subdirectory.
Usually can be auto-detected from `$PATH` as `SYSTEMPATH_AVR_TOOLS_DIR` or as `BUNDLED_AVR_TOOLS_DIR` within the Arduino distribution.
**Example:**
```Makefile
AVR_TOOLS_DIR = /usr
# or
AVR_TOOLS_DIR = /usr/share/arduino/hardware/tools/avr
```
**Requirement:** *Optional*
----
### ARM_TOOLS_DIR
**Description:**
Directory where the arm toolchain is installed. `arm-none-eabi-*` should be
within a /bin subdirectory.
Can usually be detected from `$ARDUINO_PACKAGE_DIR` /tools subdirectory when ARM
device support is installed.
**Example:**
```Makefile
ARM_TOOLS_DIR = /usr
# or
ARM_TOOLS_DIR =
/usr/share/arduino/hardware/tools/arm-none-eabi-gcc/VERSION
```
**Requirement:** *Optional*
----
### ARM_TOOLS_VER
**Description:**
Sub-directory where the arm toolchain is installed - usually the tool version.
Can usually be detected from `$ARDUINO_PACKAGE_DIR` /tools subdirectory when ARM
device support is installed. Will resolve latest version if multiple found.
**Example:**
```Makefile
ARM_TOOLS_VER = 7-2017q4
```
**Requirement:** *Optional*
----
### RESET_CMD
**Description:**
Command to reset the MCU.
Defaults to `ard-reset-arduino` with the extra `--caterina` flag for atmega32u4 boards.
**Example:**
```Makefile
RESET_CMD = $(HOME)/gertduino/reset
```
**Requirement:** *Optional*
----
### PYTHON_CMD
**Description:**
Path to Python binary. Requires pyserial module installed. Makefile will error if unable to auto-find as utility scripts will not work. To override this, give it an empty define.
**Example:**
```Makefile
PYTHON_CMD = /usr/bin/python3
```
**Requirement:** *Optional*
----
### GREP_CMD
**Description:**
Path to GNU grep binary. Only added for macOS, which has BSD grep by default but results in some parsing warnings. macOS users should install GNU grep using Homebrew.
**Example:**
```Makefile
GREP_CMD = /bin/grep
```
**Requirement:** *Optional*
----
## Arduino IDE variables
### ARDUINO_DIR
**Description:**
Directory where the Arduino IDE and/or core files are stored. Usually can be auto-detected as `AUTO_ARDUINO_DIR`.
**Example:**
```Makefile
# Linux
ARDUINO_DIR = /usr/share/arduino
# Mac OS X
ARDUINO_DIR = /Applications/Arduino.app/Contents/Resources/Java
# Mac OSX with IDE 1.5+
ARDUINO_DIR = /Applications/Arduino.app/Contents/Java
```
**Requirement:** *Optional*
----
### ARDUINO_PACKAGE_DIR
**Description:**
Directory where the Arduino package support files are stored. Can auto-detect based on default OS IDE locations.
**Example:**
```Makefile
# Linux
ARDUINO_PACKAGE_DIR = $(HOME)/.arduino15/packages
# Mac OS X
ARDUINO_PACKAGE_DIR = $(HOME)/Library/Arduino15/packages
# Windows
ARDUINO_PACKAGE_DIR = $(USERPROFILE)/AppData/Local/Arduino15/packages
```
**Requirement:** *Optional*
----
### ARDUINO_PLATFORM_LIB_PATH
**Description:**
Directory where the Arduino platform dependent libraries are stored.
(Used only for Arduino 1.5+)
**Example:**
```Makefile
ARDUINO_PLATFORM_LIB_PATH = /usr/share/arduino/hardware/arduino/avr/libraries
```
**Requirement:** *Optional*
----
### ARDUINO_VERSION
**Description:**
Version string for Arduino IDE and/or core.
Usually can be auto-detected as `AUTO_ARDUINO_VERSION` from `/usr/share/arduino/lib/version.txt`
**Example:**
```Makefile
ARDUINO_VERSION = 105
```
**Requirement:** *Optional*
----
### ARCHITECTURE
**Description:**
Architecture for Arduino 1.5+
Defaults to unset for 1.0 or `avr` for 1.5+. This value is not literally the chip architecture but will often be
the chip series within a vendor's 'hardware' folder. For example, will default to `samd` if using Sam.mk.
**Example:**
```Makefile
ARCHITECTURE = arm
```
**Requirement:** *Optional*
----
### ARDMK_VENDOR
**Description:**
Board vendor/maintainer/series.
Defaults to `arduino`.
**Example:**
```Makefile
ARDMK_VENDOR = sparkfun
```
**Requirement:** *Optional*
----
### ARDUINO_SKETCHBOOK
**Description:**
Path to `sketchbook` directory.
Usually can be auto-detected from the Arduino `preferences.txt` file or the default `$(HOME)/sketchbook`
**Example:**
```Makefile
ARDUINO_SKETCHBOOK = $(HOME)/sketches
```
**Requirement:** *Optional*
----
### ARDUINO_PREFERENCES_PATH
**Description:**
Path to Arduino `preferences.txt` file.
Usually can be auto-detected as `AUTO_ARDUINO_PREFERENCES` from the defaults:
* on Linux (1.0): `$(HOME)/.arduino/preferences.txt`
* on Linux (1.5+): `$(HOME)/.arduino15/preferences.txt`
* on Mac OS X (1.0): `$(HOME)/Library/Arduino/preferences.txt`
* on Mac OS X (1.5+): `$(HOME)/Library/Arduino15/preferences.txt`
**Example:**
```Makefile
ARDUINO_PREFERENCES_PATH = $(HOME)/sketches/preferences.txt
```
**Requirement:** *Optional*
----
### ARDUINO_CORE_PATH
**Description:**
Path to standard Arduino core files.
**Example:**
```Makefile
ARDUINO_CORE_PATH = /usr/share/arduino/hardware/arduino/cores/arduino
```
**Requirement:** *Optional*
----
## Sketch related variables
### ARDUINO_LIBS
**Description:**
Any libraries you intend to include.
Usually can be auto-detected from the sketch. Separated by spaces. If the library has a `/utility` folder (like `SD` or `Wire` library), then the utility folder should also be specified.
**Example:**
```Makefile
ARDUINO_LIBS = SD SD/utility Wire Wire/utility
```
**Requirement:** *Optional*
----
### BOARD_TAG
**Description:**
Device type as listed in `boards.txt` or `make show_boards`.
**Example:**
```Makefile
BOARD_TAG = uno or mega2560
```
**Requirement:** *Mandatory*
----
### BOARD_SUB
**Description:**
1.5+ submenu as listed in `boards.txt` or `make show_submenu`.
**Example:**
```Makefile
# diecimila.name=Arduino Duemilanove or Diecimila
BOARD_TAG=diecimila
# diecimila.menu.cpu.atmega168=ATmega168
BOARD_SUB=atmega168
```
**Requirement:** *Mandatory for 1.5+ if using a submenu CPU*
----
### BOARD_CLOCK
**Description:**
Allow selection of f_cpu and fuses specified in `boards.txt` as `{BOARD_TAG}.menu.clock.{BOARD_CLOCK}`.
This works for microprocessor board definitions like ATtiny that specify not only the clock speed but fuse settings as clock overrides.
It also works for f_cpu values specified in `boards.txt` as `{BOARD_TAG}.menu.speed.{BOARD_CLOCK}`.
For example, the Watterott ATmega328PB library [https://github.com/watterott/ATmega328PB-Testing](https://github.com/watterott/ATmega328PB-Testing).
**Example:**
```Makefile
# Select external 16 MHz clock
BOARD_CLOCK=external16
```
**Example:**
```Makefile
# Select 20MHz speed
BOARD_CLOCK=20mhz
```
**Requirement:** *Optional to override main board f_cpu and/or fuse settings.*
----
### MONITOR_PORT
**Description:**
Path to serial (USB) device used for uploading/serial comms.
**Example:**
```Makefile
# Linux
MONITOR_PORT = /dev/ttyUSB0
# or
MONITOR_PORT = /dev/ttyACM0
# Mac OS X
MONITOR_PORT = /dev/cu.usb*
# Windows
MONITOR_PORT = com3
```
**Requirement:** *Mandatory*
----
### FORCE_MONITOR_PORT
**Description:**
Skip the MONITOR_PORT existance check.
**Example:**
```Makefile
# Enable
FORCE_MONITOR_PORT = true
# Disable (default)
undefine FORCE_MONITOR_PORT
```
**Requirement:** *Optional*
----
### USER_LIB_PATH
**Description:**
Directory where additional libraries are stored.
Defaults to `libraries` directory within user's sketchbook.
**Example:**
```Makefile
# Linux
USER_LIB_PATH = $(HOME)/sketchbook/libraries
# For a random project on *nix
USER_LIB_PATH = /path/to/my/project
```
**Requirement:** *Optional*
----
### OBJDIR
**Description:**
Directory where binaries and compiled files are put.
Defaults to `build-$(BOARD_TAG)` in your `Makefile` directory.
**Example:**
```Makefile
OBJDIR = /path/to/my/project-directory/bin
```
**Requirement:** *Optional*
----
### TARGET
**Description:**
What name you would like for generated target files.
Defaults to the name of your current working directory, but with underscores (_) instead of spaces.
**Example:**
```Makefile
TARGET = my-project
```
Will generate targets like `my-project.hex` and `my-project.elf`.
**Requirement:** *Optional*
----
### ALTERNATE_CORE
**Description:**
Non-standard core for Arduino-unsupported chips like the ATtiny.
**Example:**
```Makefile
# HLT core
ALTERNATE_CORE = attiny-master
# tiny core
ALTERNATE_CORE = arduino-tiny
# tiny core 2
ALTERNATE_CORE = tiny2
```
**Requirement:** *Optional*
----
### ARDUINO_VAR_PATH
**Description:**
Path to non-standard core's variant files.
**Example:**
```Makefile
ARDUINO_VAR_PATH = $(HOME)/sketchbook/hardware/arduino-tiny/cores/tiny
```
**Requirement:** *Optional*
----
### CORE
**Description:**
Name of the core *inside* the ALTERNATE_CORE or the standard core.
Usually can be auto-detected as `build.core` from `boards.txt`.
**Example:**
```Makefile
# standard Arduino core (undefine ALTERNATE_CORE)
CORE = arduino
# or
CORE = robot
# tiny core (ALTERNATE_CORE = arduino-tiny)
CORE = tiny
```
**Requirement:** *Optional*
----
### BOARD
**Description:**
Board identifier that passes to a compile option as -DARDUINO_$(BOARD).
Usually can be auto-detected as `build.board` from `boards.txt`.
If not found build.board entry, use upper-case converted "$(ARCHITECTURE)_$(BOARD_TAG)".
**Example:**
```Makefile
BOARD = AVR_LEONARD
```
**Requirement:** *Optional*
----
### VARIANT
**Description:**
Variant of a standard board design.
Usually can be auto-detected as `build.variant` from `boards.txt`.
**Example:**
```Makefile
VARIANT = leonardo
```
**Requirement:** *Optional*
----
### USB_TYPE
**Description:**
Define Teensy 3.1 usb device type. Default is USB_SERIAL
**Example:**
```Makefile
USB_TYPE = USB_SERIAL
# or
USB_TYPE = USB_HID
# or
USB_TYPE = USB_SERIAL_HID
# or
USB_TYPE = USB_MIDI
# or
USB_TYPE = USB_RAWHID
# or
USB_TYPE = USB_FLIGHTSIM
```
**Requirement:** *Optional*
----
### USB_VID
**Description:**
Override `USB VID` for atmega32u4 boards.
Usually can be auto-detected as `build.vid` from `boards.txt`
**Example:**
```Makefile
USB_VID = 0x2341
```
**Requirement:** *Optional*
----
### USB_PID
**Description:**
Override `USB PID` for atmega32u4 boards.
Usually can be auto-detected as `build.pid` from `boards.txt`
**Example:**
```Makefile
USB_PID = 0x8039
```
**Requirement:** *Optional*
----
### F_CPU
**Description:**
CPU speed in Hz
Usually can be auto-detected as `build.f_cpu` from `boards.txt`, except in
some 1.5+ cores like attiny where there is a clock submenu.
**Example:**
```Makefile
F_CPU = 8000000L
```
**Requirement:** *Optional*
----
### HEX_MAXIMUM_SIZE
**Description:**
Maximum hex file size
Usually can be auto-detected as `upload.maximum_size` from `boards.txt`
**Example:**
```Makefile
HEX_MAXIMUM_SIZE = 14336
```
**Requirement:** *Optional*
----
### MCU
**Description:**
Microcontroller model.
Usually can be auto-detected as `build.mcu` from `boards.txt`
**Example:**
```Makefile
MCU = atmega32u4
```
**Requirement:** *Optional*
----
### MCU_FLAG_NAME
**Description:**
Override default MCU flags.
Defaults to `mmcu`
**Example:**
```Makefile
MCU_FLAG_NAME = mprocessor
```
**Requirement:** *Optional*
----
### MONITOR_BAUDRATE
**Description:**
Baudrate of the serial monitor.
Defaults to `9600` if it can't find it in the sketch `Serial.begin()`
**Example:**
```Makefile
MONITOR_BAUDRATE = 57600
```
**Requirement:** *Optional*
----
## ISP programming variables
### ISP_PROG
**Description:**
Type of ISP. Either a USB device or ArduinoISP protocol.
**Example:**
```Makefile
ISP_PROG = usbasp
# or
ISP_PROG = usbtiny
# or
ISP_PROG = stk500v2
# or
ISP_PROG = stk500v1
```
**Requirement:** *Optional*
----
### ISP_PORT
**Description:**
Device path to ArduinoISP. Not needed for hardware ISP's. Also used to define
bootloader port on SAMD devices.
**Example:**
```Makefile
# Linux
ISP_PORT = /dev/ttyACM0
```
**Requirement:** *Optional*
----
### ISP_LOCK_FUSE_PRE
**Description:**
Bootloader unlock bits.
Usually can be auto-detected from `boards.txt`
**Example:**
```Makefile
ISP_LOCK_FUSE_PRE = 0x3f
```
**Requirement:** *Optional*
----
### ISP_LOCK_FUSE_POST
**Description:**
Bootloader lock bits.
Usually can be auto-detected from `boards.txt`
**Example:**
```Makefile
ISP_LOCK_FUSE_POST = 0xcf
```
**Requirement:** *Optional*
----
### ISP_HIGH_FUSE
**Description:**
`ISP_LOW_FUSE/ISP_EXT_FUSE` - high/low/extended fuse bits.
Usually can be auto-detected from `boards.txt`
**Example:**
```Makefile
ISP_HIGH_FUSE = 0xdf # or 0xff or 0x01
```
**Requirement:** *Optional*
----
### ISP_EEPROM
**Description:**
Whether to upload the EEPROM file or not.
Defaults to `0`
**Example:**
```Makefile
ISP_EEPROM = 1
```
**Requirement:** *Optional*
----
## Compiler/Executable variables
### CC_NAME
**Description:**
C compiler.
Defaults to `avr-gcc`
**Example:**
```Makefile
CC_NAME = pic32-gcc
```
**Requirement:** *Optional*
----
## Compiler/Executable variables
### TOOL_PREFIX
**Description:**
The tool prefix, which gets prepended to the tools like $(TOOL_PREFIX)-gcc, $(TOOL_PREFIX)-g++, etc.
The following tools will be prefixed with '$(TOOL_PREFIX)-':
* gcc
* g++
* as
* objcopy
* objdump
* ar
* size
* nm
Defaults to `avr`
**Example:**
```Makefile
TOOL_PREFIX = arm-none-eabi
TOOL_PREFIX = pic32
```
**Requirement:** *Optional*
----
### CXX_NAME
**Description:**
C++ compiler.
Defaults to `avr-g++`
**Example:**
```Makefile
CXX_NAME = pic32-g++
```
**Requirement:** *Optional*
----
### OBJCOPY_NAME
**Description:**
Objcopy utility.
Defaults to `avr-objcopy`
**Example:**
```Makefile
OBJCOPY_NAME = pic32-objcopy
```
**Requirement:** *Optional*
----
### OBJDUMP_NAME
**Description:**
Objdump utility.
Defaults to `avr-objdump`
**Example:**
```Makefile
OBJDUMP_NAME = pic32-objdump
```
**Requirement:** *Optional*
----
### AR_NAME
**Description:**
Archive utility.
Defaults to `avr-ar` unless you're using toolchain > 4.9.0 in which case we use avr-gcc-ar.
**Example:**
```Makefile
AR_NAME = pic32-ar
```
**Requirement:** *Optional*
----
### SIZE_NAME
**Description:**
Size utility.
Defaults to `avr-size`
**Example:**
```Makefile
SIZE_NAME = pic32-size
```
**Requirement:** *Optional*
----
### NM_NAME
**Description:**
Nm utility.
Defaults to `avr-nm`
**Example:**
```Makefile
NM_NAME = pic32-nm
```
**Requirement:** *Optional*
----
### GDB_NAME
**Description:**
GDB utility.
Defaults to `arm-none-eabi-gdb`
**Requirement:** *Optional*
----
### OPTIMIZATION_LEVEL
**Description:**
Linker's `-O` flag
Defaults to `s`, which shouldn't really be changed as it breaks `SoftwareSerial` and usually results in bigger hex files.
**Example:**
```Makefile
OPTIMIZATION_LEVEL = 3
```
**Requirement:** *Optional*
----
### OTHER_LIBS
**Description:**
Additional Linker lib flags, for platform support
Defaults to ""
**Example:**
```Makefile
OTHER_LIBS = -lsomeplatformlib
```
**Requirement:** *Optional*
----
### CFLAGS_STD
**Description:**
Controls, *exclusively*, which C standard is to be used for compilation.
Defaults to `undefined` on 1.0.x or `-std=gnu11` on 1.5+ or if you install AVR toolchain > 4.9.0
Possible values:
* With `avr-gcc 4.3`, shipped with the 1.0 Arduino IDE:
* `undefined`
* `-std=c99`
* `-std=gnu89` - This is the default for C code
* `-std=gnu99`
* With `avr-gcc 4.7, 4.8 or 4.9`, installed by you or 1.5+ IDE:
* `undefined`
* `-std=c99`
* `-std=c11`
* `-std=gnu89`
* `-std=gnu99`
* `-std=gnu11` - This is the default for C code
For more information, please refer to the [Options Controlling C Dialect](https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html)
**Example:**
```Makefile
CFLAGS_STD = -std=gnu89
```
**Requirement:** *Optional*
----
### CXXFLAGS_STD
**Description:**
Controls, *exclusively*, which C++ standard is to be used for compilation.
Defaults to `undefined` on 1.0 or `-std=gnu++11` on AVR toolchain > 4.9.0 (e.g. IDE 1.6.10+)
Possible values:
* With `avr-gcc 4.3`, shipped with the 1.0 Arduino IDE:
* `undefined`
* `-std=c++98`
* `-std=c++0x`
* `-std=gnu++98` - This is the default for C code
* `-std=gnu++0x`
* With `avr-gcc 4.7, 4.8 or 4.9`, installed by you or 1.5+ IDE:
* `undefined`
* `-std=c++98`
* `-std=c++11`
* `-std=c++1y`
* `-std=c++14`
* `-std=gnu++98`
* `-std=gnu++11` - This is the default for C++ code
* `-std=gnu++1y`
* `-std=gnu++14`
For more information, please refer to the [Options Controlling C Dialect](https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html)
**Example:**
```Makefile
CXXFLAGS_STD = -std=gnu++98
```
**Requirement:** *Optional*
----
### CFLAGS
**Description:**
Flags passed to compiler for files compiled as C. Add more flags to this
variable using `+=`.
Defaults to `undefined` on 1.0 or `-flto -fno-fat-lto-objects -fdiagnostics-color=$(DIAGNOSTICS_COLOR_WHEN)` on AVR toolchain > 4.9.0 (e.g. IDE 1.6.10+)
**Example:**
```Makefile
CFLAGS += -my-c-only-flag
```
**Requirement:** *Optional*
----
### CXXFLAGS
**Description:**
Flags passed to the compiler for files compiled as C++. Add more flags to this
variable using `+=`.
Defaults to `-fpermissive -fno-exceptions` on 1.0
or `-fpermissive -fno-exceptions -fno-threadsafe-statics -flto -fno-devirtualize -fdiagnostics-color`
on AVR toolchain > 4.9.0 (e.g. IDE 1.6.10+)
**Example:**
```Makefile
CXXFLAGS += -my-c++-onlyflag
```
**Requirement:** *Optional*
----
### DIAGNOSTICS_COLOR_WHEN
**Description:**
This variable controls the compiler's diagnostics-color setting, as defined
in CFLAGS or CXXFLAGS, on AVR toolchain > 4.9.0.
Supported values are: `always`, `never` and `auto`.
For more details, see: [Options to Control Diagnostic Messages Formatting]
(https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/Language-Independent-Options.html#Language-Independent-Options)
Defaults to `always`.
**Example:**
```Makefile
DIAGNOSTICS_COLOR_WHEN = never
# or
DIAGNOSTICS_COLOR_WHEN = auto
```
**Requirement:** *Optional*
----
### ASFLAGS
**Description:**
Flags passed to compiler for files compiled as assembly (e.g. `.S` files). Add
more flags to this variable using `+=`.
Defaults to all flags required for a typical build.
**Example:**
```Makefile
ASFLAGS += -my-as-only-flag
```
**Requirement:** *Optional*
----
### CPPFLAGS
**Description:**
Flags passed to the C pre-processor (for C, C++ and assembly source files). Add
more flags to this variable using `+=`.
Defaults to all flags required for a typical build.
**Example:**
```Makefile
CPPFLAGS += -DMY_DEFINE_FOR_ALL_SOURCE_TYPES
```
**Requirement:** *Optional*
----
### OVERRIDE_EXECUTABLES
**Description:**
Override the default build tool paths and names.
If OVERRIDE_EXECUTABLES is defined, all tools (`CC`, `CXX`, `AS`,
`OBJCOPY`, `OBJDUMP`, `AR`, `SIZE`, `NM`) must have their paths
explicitly defined. This may be used in the rare case where
overriding a path and/or executable name is required.
The "?=" assignment cannot be used because the executable tags
are already implicitly defined by Make (e.g. $(CC) == cc).
**Example:**
```Makefile
OVERRIDE_EXECUTABLES = 1
CC = /usr/bin/avr-gcc
CXX = /usr/bin/avr-g++
AS = /usr/bin/avr-as
OBJCOPY = /usr/bin/avr-objcopy
OBJDUMP = /usr/bin/avr-objdump
AR = /usr/bin/avr-ar
SIZE = /some_path/alternative_avr-size
NM = /some_path/alternative_avr-nm
```
**Requirement:** *Optional*
----
### MONITOR_CMD
**Description:**
Command to run the serial monitor.
Defaults to `screen`
**Example:**
```Makefile
MONITOR_CMD = minicom
```
**Requirement:** *Optional*
----
### MONITOR_PARAMS
**Description:**
Additional parameters for the putty -sercfg command line argument.
Interpreted as a comma-separated list of configuration options.
**Example:**
```Makefile
MONITOR_PARAMS = 8,1,n,N
```
**Requirement:** *Optional*
----
### PRE_BUILD_HOOK
**Description:**
Path to shell script to be executed before build. Could be used to automatically
bump revision number for example.
Defaults to `pre-build-hook.sh`
**Example:**
```Makefile
PRE_BUILD_HOOK = $(HOME)/bin/bump-revision.sh
```
**Requirement:** *Optional*
----
## Avrdude setting variables
### AVRDUDE
**Description:**
Path to `avrdude` utility
Usually can be auto-detected within the parent of `AVR_TOOLS_DIR` or in the `$PATH`
**Example:**
```Makefile
AVRDUDE = /usr/bin/avrdude
```
**Requirement:** *Optional*
----
### AVRDUDE_CONF
**Description:**
Path to `avrdude.conf` file
Usually can be auto-detected within the parent of `AVR_TOOLS_DIR`
**Example:**
```Makefile
AVRDUDE_CONF = /etc/avrdude.conf
# or
AVRDUDE_CONF = /usr/share/arduino/hardware/tools/avrdude.conf
```
**Requirement:** *Optional*
----
### AVRDUDE_AUTOERASE_FLASH
**Description:**
Enable autoerase flash.
By default disabled.
**Example:**
```Makefile
AVRDUDE_AUTOERASE_FLASH = yes
```
**Requirement:** *Optional*
----
### AVR_TOOLS_PATH
**Description:**
Directory where tools such as `avrdude`, `avr-g++`, `avr-gcc` etc. are stored.
Usually can be auto-detected from `AVR_TOOLS_DIR/bin`
**Example:**
```Makefile
AVR_TOOLS_PATH = /usr/bin
# or
AVR_TOOLS_PATH = /usr/share/arduino/hardware/tools/avr/bin
```
**Requirement:** *Optional*
----
### ARDUINO_LIB_PATH
**Description:**
Directory where the standard Arduino libraries are stored.
Defaults to `ARDUINO_DIR/libraries`
**Example:**
```Makefile
# Linux
ARDUINO_LIB_PATH = /usr/share/arduino/libraries
```
**Requirement:** *Optional*
----
### ARDUINO_CORE_PATH
**Description:**
Directory where the standard Arduino cores are stored.
Defaults to `ARDUINO_DIR/hardware/arduino/cores/arduino`
**Example:**
```Makefile
ARDUINO_CORE_PATH = /usr/share/arduino/hardware/arduino/cores/robot
```
**Requirement:** *Optional*
----
### ALTERNATE_CORE_PATH
**Description:**
Path to non-standard cores.
Defaults to `ARDUINO_SKETCHBOOK/hardware/ALTERNATE_CORE`
**Example:**
```Makefile
ALTERNATE_CORE_PATH = $(HOME)/sketchbook/hardware/arduino-tiny/cores/tiny
```
**Requirement:** *Optional*
----
### CORE_VER
**Description:**
Alternate core release version. The Arduino board support packages are within
a sub-directory indicated by this define.
Defaults to package current release.
**Example:**
```Makefile
CORE_VER = 1.6.17
```
**Requirement:** *Optional*
----
### CMSIS_DIR
**Description:**
Path to ARM CMSIS. Normally installed as part of ARM board support.
Defaults to `ARDUINO_PACKAGE_DIR/tools/CMSIS/4.5.0/CMSIS`
**Example:**
```Makefile
CMSIS_DIR = /usr/share/CMSIS
```
**Requirement:** *Optional*
----
### CMSIS_ATMEL_DIR
**Description:**
Path to CMSIS-Atmel directory. Installed with ARM support package.
Defaults to `ARDUINO_PACKAGE_DIR/tools/CMSIS-Atmel/1.1.0/CMSIS`
**Requirement:** *Optional*
----
### BOARDS_TXT
**Description:**
Path to `boards.txt`
Defaults to `ARDUINO_DIR/hardware/arduino/boards.txt`
**Example:**
```Makefile
BOARD_TXT = $(HOME)/sketchbook/hardware/boards.txt
# or
BOARD_TXT = /usr/share/arduino/hardware/arduino/boards.txt
```
**Requirement:** *Optional*
----
### AVRDUDE_ARD_BAUDRATE
**Description:**
Upload speed
Usually can be auto-detected as `upload.speed` from `boards.txt`
**Example:**
```Makefile
AVRDUDE_ARD_BAUDRATE = 19200
```
**Requirement:** *Optional*
----
### AVRDUDE_ARD_PROGRAMMER
**Description:**
Upload protocol
Usually can be auto-detected as `upload.protocol` from `boards.txt`
**Example:**
```Makefile
AVRDUDE_ARD_PROGRAMMER = stk500v1
```
**Requirement:** *Optional*
----
### AVRDUDE_ISP_BAUDRATE
**Description:**
ISP speed if different to `upload.speed`
Defaults to same as `AVRDUDE_ARD_BAUDRATE` or `19200`
**Example:**
```Makefile
AVRDUDE_ISP_BAUDRATE = 19200
```
**Requirement:** *Optional*
----
### AVRDUDE_OPTS
**Description:**
Options to pass to `avrdude`.
Defaults to `-q -V` (quiet, don't verify). User values are not *ANDed* to the defaults, you have to set each option you require.
**Example:**
```Makefile
AVRDUDE_OPTS = -v
```
**Requirement:** *Optional*
----
## Bootloader variables
### BOOTLOADER_FILE
**Description:**
File for bootloader.
Usually can be auto-detected as `bootloader.file` from `boards.txt`
**Example:**
```Makefile
BOOTLOADER_FILE = optiboot_atmega328.hex
```
**Requirement:** *Optional*
----
### BOOTLOADER_PATH
**Description:**
Relative path to bootloader directory.
Usually can be auto-detected as a relative `bootloader.path` from `boards.txt`
Deprecated in 1.5, now part of bootloader.file
**Example:**
```Makefile
BOOTLOADER_PATH = optiboot
# or
BOOTLOADER_PATH = arduino:atmega
```
**Requirement:** *Optional*
----
### BOOTLOADER_PARENT
**Description:**
Absolute path to bootloader file's parent directory.
Defaults to `/usr/share/arduino/hardware/arduino/bootloaders` (Linux)
**Example:**
```Makefile
BOOTLOADER_PARENT = $(HOME)/sketchbook/hardware/promicro/bootloaders
BOOTLOADER_PATH = caterina
BOOTLOADER_FILE = Caterina-promicro16.hex
```
Would result in an absolute path to the bootloader hex file of `$(HOME)/sketchbook/hardware/promicro/bootloaders/caterina/Caterina-promicro16.hex`
**Requirement:** *Optional, unless BOOTLOADER_FILE and/or BOOTLOADER_PATH are user-defined*
----
### BOOTLOADER_SIZE
**Description:**
Size of bootloader on ARM devices, ensures correct start address when flashing
application area. Normally parsed from boards.txt
Defaults to `0x2000`
**Requirement:** *Optional*
----
### BOOTLOADER_UNPROTECT
**Description:**
Bootloader unprotect sequence for upload tool. Normally parsed from boards.txt
Defaults to `at91samd bootloader 0`
**Requirement:** *Optional*
----
### BOOTLOADER_PROTECT
**Description:**
Bootloader protect sequence for upload tool. Normally parsed from boards.txt
Defaults to `at91samd bootloader 16384`
**Requirement:** *Optional*
----
### BOOTLOADER_PROTECT_VERIFY
**Description:**
Bootloader protect and verify sequence for upload tool. Normally parsed from boards.txt
Defaults to `at91samd bootloader`
**Requirement:** *Optional*
----
### BOOTLOADER_UPLOAD_TOOL
**Description:**
Bootloader upload binary to use. Normally parsed from boards.txt.
Defaults to `openocd`
**Requirement:** *Optional*
----
## ChipKIT variables
### MPIDE_DIR
**Description:**
Path to chipKIT MP IDE
Usually can be auto-detected as `AUTO_MPIDE_DIR` from the defaults `/usr/share/mpide` (Linux) or `/Applications/Mpide.app/Contents/Resources/Java` (OSX)
**Example:**
```Makefile
MPIDE_DIR = $(HOME)/mpide
```
**Requirement:** *Optional*
----
### MPIDE_PREFERENCES_PATH
**Description:**
Path to chipKIT `preferences.txt` file.
Usually can be auto-detected as `AUTO_MPIDE_PREFERENCES_PATH` from the defaults `$(HOME)/.mpide/preferences.txt` (Linux) or `$(HOME)/Library/Mpide/preferences.txt` (OSX)
**Example:**
```Makefile
MPIDE_PREFERENCES_PATH = $(HOME)/chipkit/preferences.txt
```
**Requirement:** *Optional*
----
## ARM variables
### UPLOAD_TOOL
**Description:**
Tool to upload binary to device. Normally parsed from boards.txt.
Defaults to `openocd`
**Example:**
```Makefile
UPLOAD_TOOL = gdb
```
**Requirement:** *Optional*
----
### DEBUG
**Description:**
Define to set `DEBUG_FLAGS` and allow stepping of code using GDB.
Defaults to undefined.
**Example:**
```Makefile
DEBUG = 1
```
**Requirement:** *Optional*
----
### GDB_PORT
**Description:**
Server port to use for GDB debugging or upload. Default assumes server running
on localhost but can re-define to use Black Magic Probe serial port.
Defaults to `localhost:3333`
**Example:**
```Makefile
GDB_PORT = /dev/ttyACM0
```
**Requirement:** *Optional*
----
### GDB_OPTS
**Description:**
Optional arguments to parse to GDB command.
Defaults to `-ex "target extended-remote $(GDB_PORT)" -ex "monitor swdp_scan" -ex "attach 1" -ex "load" -d $(OBJDIR) $(TARGET_ELF)`
**Requirement:** *Optional*
----
### GDB_UPLOAD_OPTS
**Description:**
Optional arguments to parse to GDB command when uploading binary only.
Defaults to `GDB_UPLOAD_OPTS = $(GDB_OPTS) -ex "set confirm off" -ex "set target-async off" -ex "set remotetimeout 30" -ex "detach" -ex "kill" -ex "quit"`
**Requirement:** *Optional*
----
### BOSSA
**Description:**
Path to bossac binary.
Can usually be detected from `$ARDUINO_PACKAGE_DIR` /tools subdirectory when ARM
device support is installed.
**Requirement:** *Optional*
----
### BOSSA_VER
**Description:**
`bossa` sub-directory - usually the tool version. Will auto-detect to highest version found.
**Requirement:** *Optional*
----
### BOSSA_OPTS
**Description:**
Flags to pass to bossac command.
Defaults to `-d --info --erase --write --verify --reset`
**Requirement:** *Optional*
----
### OPENOCD
**Description:**
Path to openocd binary.
Can usually be detected from `$ARDUINO_PACKAGE_DIR` /tools subdirectory when ARM
device support is installed.
**Requirement:** *Optional*
----
### OPENOCD_VER
**Description:**
`openocd` sub-directory - usually the tool version. Will auto-detect to highest version found.
**Requirement:** *Optional*
----
### OPENOCD_OPTS
**Description:**
Flags to pass to openocd command. If using openocd from non-Arduino
distributions, one should define this with the path to the Arduino openocd script.
Defaults to `-d2`
Example:
```Makefile
OPENOCD_OPTS = $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/openocd/0.9.0-arduino6-static/share/openocd/scripts/ -f $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/hardware/samd/1.6.17/variants/$(VARIANT)/$(OPENOCD_SCRIPT)
```
**Requirement:** *Optional*
----
## Ctags variables
### TAGS_FILE
**Description:**
Output file name for tags. Defaults to 'tags'.
**Example:**
```Makefile
TAGS_FILE = .tags
```
**Requirement:** *Optional*
----
### CTAGS_OPTS
**Description:**
Additional options to pass to `ctags` command.
**Example:**
```Makefile
# Run ctags in verbose mode
CTAGS_OPTS = -V
```
**Requirement:** *Optional*
----
### CTAGS_EXEC
**Description:**
Path to the `ctags` binary. Defaults to user path.
**Example:**
```Makefile
CTAGS_EXEC = /usr/local/bin/ctags
```
**Requirement:** *Optional*
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