Compiler optimisation for due board

himsikha · April 26, 2018, 7:27am

Hi,

How to change the compiler options for arduino due (arduino -1.5.7) running on linux machine?

pert · April 26, 2018, 7:31am

Is there a particular reason you're using Arduino IDE 1.5.7? That is a very outdated version that was only ever considered a beta.

himsikha · April 26, 2018, 9:31am

Hi,

Yeah its beta version only.
In the arduino 1.8.5 ,i am unable to find find option for arduino due board.So, i am using arduino-1.5.7

pert · April 26, 2018, 9:50am

They stopped bundling the hardware package for the Due (Arduino SAM Boards) in recent versions of the Arduino IDE but it's quite easy to install it:

Tools > Board > Boards Manager
Wait for downloads to finish.
Click on "Arduino SAM Boards".
Click "Install".
Wait for installation to finish.
Click "Close".

There has been a lot of development on the Arduino IDE since 1.5.7 so you might find it useful to update but the choice is yours of course.

As for the compiler options. These are set in the file platform.txt. Each hardware package has its own platform.txt so you will notice there is one for Arduino AVR Boards and another for Arduino SAM Boards. In your Arduino IDE 1.5.7 installation you will find the Arduino SAM Boards platform.txt at {Arduino IDE instatallation folder}/hardware/arduino/sam/platform.txt.

To make changes to the flags you can edit that file directly. The Arduino IDE only scans platform.txt on startup so you need to close all Arduino IDE windows and then start the IDE again before changes you make to platform.txt will take effect.

There are also some options to add custom compilation flags without editing platform.txt.

You can create a file named platform.local.txt and in that file define any of these properties:

compiler.c.extra_flags
compiler.c.elf.extra_flags
compiler.cpp.extra_flags
compiler.ar.extra_flags
compiler.elf2hex.extra_flags

You can examine platform.txt to see exactly where those properties will be expanded in the compilation recipes. For example:

recipe.cpp.o.pattern="{compiler.path}{compiler.cpp.cmd}" {compiler.cpp.flags} -mcpu={build.mcu} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.cpp.extra_flags} {build.extra_flags} {compiler.libsam.c.flags} {includes} "{source_file}" -o "{object_file}"

The same requirement of restarting the IDE applies for platform.local.txt.

There is also the possibility to pass these properties from the command line if you're using the Arduino IDE CLI. For example:

arduino --pref compiler.cpp.extra_flags=-O0 --upload --board arduino:sam:arduino_due_x_dbg foobar.ino

Unfortunately it's only possible to do this when compiling from the command line. You can't set the compiler flags as used by compilation in the Arduino IDE GUI from the command line.

More information on the Arduino IDE CLI:

github.com

arduino/Arduino/blob/master/build/shared/manpage.adoc

// Generate a manpage with: a2x -f manpage manpage.adoc
// or HTML with: a2x -f xhtml manpage.adoc
//
// This file uses {empty}:: in some places, to allow putting multiple
// paragraphs inside a single label list item. This is a bit ugly and
// non-semantic, but it seems this is the best way to do this. Asciidoc
// also supports putting a plus sign on a line by itself to join two
// paragraphs into a single list item. However, the indentation on the
// second paragraph makes that formatted with a fixed-size font.
// Removing the indentation completely makes the asciidoc source very
// unreadable. Also, for the --board option, there is a a paragraph,
// followed by a list, followed by another paragraph. The + approach can
// only put the latter paragraph into the inner list, not the outer
// one...

ARDUINO(1)
==========
:doctype: manpage

NAME

This file has been truncated. show original

pert · April 26, 2018, 9:56am

I should mention if you do update to a recent IDE version that requires you to install Arduino SAM Boards then the platform.txt will be found in a different location on your computer. I can provide instructions for finding that.

himsikha · April 30, 2018, 8:56am

hI,

Thank you so much for your reply.
But in arduino-1.8.5, Tools->Boards->BoardManager ,no options are there to install Arduino SAM Boards.

ard_newbie · April 30, 2018, 9:11am

When you select Tools > Type of boards > Board manager, what do you see ( attach an hard copy of your screen)

bobes131 · May 26, 2020, 9:16am

Hello I have the same problem. No SAM directory present in the ...\Program Files (x86)\Arduino\hardware\arduino. Only avr directory is present.

pert · May 26, 2020, 9:47am

bobes131:
Hello I have the same problem. No SAM directory present in the ...\Program Files (x86)\Arduino\hardware\arduino. Only avr directory is present.

This is normal and expected. That path is where the copy of Arduino AVR Boards bundled with the Arduino IDE is located. Arduino SAM Boards has not been bundled with the Arduino IDE for years. When you install a boards platform via Boards Manager, it is installed to a different location. You can find it by clicking the link at the line following File > Preferences > More preferences can be edited directly in the file, then navigating from there to the packages/arduino/hardware/sam/1.6.12 folder.

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Compiler optimisation for due board

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