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Showing content from https://arduino.github.io/arduino-cli/dev/sketch-specification/../sketch-project-file/ below:

Sketch project file - Arduino CLI

Sketch project file

Sketch metadata is defined in a file named sketch.yaml. This file is in YAML format.

Build profiles¶

Arduino CLI provides support for reproducible builds through the use of build profiles.

A profile is a complete description of all the resources needed to build a sketch. The sketch project file may contain multiple profiles.

Each profile will define:

The board FQBN
The programmer to use
The target core platform name and version (with the 3rd party platform index URL if needed)
A possible core platform name and version, that is a dependency of the target core platform (with the 3rd party platform index URL if needed)
A list of libraries used in the sketch. Each library could be:
- a library taken from the Arduino Libraries Index
- a library installed anywhere in the filesystem
The port and protocol to upload the sketch and monitor the board

The format of the file is the following:

profiles:
  <PROFILE_NAME>:
    notes: <USER_NOTES>
    fqbn: <FQBN>
    programmer: <PROGRAMMER>
    platforms:
      - platform: <PLATFORM> [(<PLATFORM_VERSION>)]
        platform_index_url: <3RD_PARTY_PLATFORM_URL>
      - platform: <PLATFORM_DEPENDENCY> [(<PLATFORM_DEPENDENCY_VERSION>)]
        platform_index_url: <3RD_PARTY_PLATFORM_DEPENDENCY_URL>
    libraries:
      - <INDEX_LIB_NAME> (<INDEX_LIB_VERSION>)
      - dir: <LOCAL_LIB_PATH>
    port: <PORT_NAME>
    port_config:
      <PORT_SETTING_NAME>: <PORT_SETTING_VALUE>
      ...
    protocol: <PORT_PROTOCOL>
  ...more profiles here...

There is an optional profiles: section containing all the profiles. Each field in a profile is mandatory (unless noted otherwise below). The available fields are:

<PROFILE_NAME> is the profile identifier, it’s a user-defined field, and the allowed characters are alphanumerics, underscore _, dot ., and dash -.
<PLATFORM> is the target core platform identifier, for example, arduino:avr or adafruit:samd.
<PLATFORM_VERSION> is the target core platform version required.
<3RD_PARTY_PLATFORM_URL> is the index URL to download the target core platform (also known as “Additional Boards Manager URLs” in the Arduino IDE). This field can be omitted for the official arduino:* platforms.
<PLATFORM_DEPENDENCY>, <PLATFORM_DEPENDENCY_VERSION>, and <3RD_PARTY_PLATFORM_DEPENDENCY_URL> contains the same information as <PLATFORM>, <PLATFORM_VERSION>, and <3RD_PARTY_PLATFORM_URL> respectively but for the core platform dependency of the main core platform. These fields are optional.
libraries: is a section where the required libraries to build the project are defined. This section is optional.
- <INDEX_LIB_NAME> (<INDEX_LIB_VERSION>) represents a library from the Arduino Libraries Index, for example, MyLib (1.0.0).
- dir: <LOCAL_LIB_PATH> represents a library installed in the filesystem and <LOCAL_LIB_PATH> is the path to the library. The path could be absolute or relative to the sketch folder. This option is available since Arduino CLI 1.3.0.
<USER_NOTES> is a free text string available to the developer to add comments. This field is optional.
<PROGRAMMER> is the programmer that will be used. This field is optional.

The following fields are available since Arduino CLI 1.1.0:

<PORT_NAME> is the port that will be used to upload and monitor the board (unless explicitly set otherwise). This field is optional.
port_config section with <PORT_SETTING_NAME> and <PORT_SETTING_VALUE> defines the port settings that will be used in the monitor command. Typically is used to set the baudrate for the serial port (for example baudrate: 115200) but any setting/value can be specified. Multiple settings can be set. These fields are optional.
<PORT_PROTOCOL> is the protocol for the port used to upload and monitor the board. This field is optional.

Using a system-installed platform.¶

The fields <PLATFORM_VERSION> and <PLATFORM_DEPENDENCY_VERSION> are optional, if they are omitted, the sketch compilation will use the platforms installed system-wide. This could be helpful during the development of a platform (where a specific release is not yet available), or if a specific version of a platform is not a strict requirement.

An example of a complete project file.¶

A complete example of a sketch project file may be the following:

profiles:
  nanorp:
    fqbn: arduino:mbed_nano:nanorp2040connect
    platforms:
      - platform: arduino:mbed_nano (2.1.0)
    libraries:
      - ArduinoIoTCloud (1.0.2)
      - Arduino_ConnectionHandler (0.6.4)
      - TinyDHT sensor library (1.1.0)

  another_profile_name:
    notes: testing the limit of the AVR platform, may be unstable
    fqbn: arduino:avr:uno
    platforms:
      - platform: arduino:avr (1.8.4)
    libraries:
      - VitconMQTT (1.0.1)
      - Arduino_ConnectionHandler (0.6.4)
      - TinyDHT sensor library (1.1.0)
    port: /dev/ttyACM0
    port_config:
      baudrate: 115200

  tiny:
    notes: testing the very limit of the AVR platform, it will be very unstable
    fqbn: attiny:avr:ATtinyX5:cpu=attiny85,clock=internal16
    platforms:
      - platform: attiny:avr (1.0.2)
        platform_index_url: https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json
      - platform: arduino:avr (1.8.3)
    libraries:
      - ArduinoIoTCloud (1.0.2)
      - Arduino_ConnectionHandler (0.6.4)
      - TinyDHT sensor library (1.1.0)

  feather:
    fqbn: adafruit:samd:adafruit_feather_m0
    platforms:
      - platform: adafruit:samd (1.6.0)
        platform_index_url: https://adafruit.github.io/arduino-board-index/package_adafruit_index.json
    libraries:
      - ArduinoIoTCloud (1.0.2)
      - Arduino_ConnectionHandler (0.6.4)
      - TinyDHT sensor library (1.1.0)

default_profile: nanorp

Building a sketch¶

When a sketch project file is present, it can be leveraged to compile the sketch with the --profile/-m flag in the compile command:

arduino-cli compile --profile nanorp

In this case, the sketch will be compiled using the core platform and libraries specified in the nanorp profile. If a core platform or a library is missing it will be automatically downloaded and installed on the fly in an isolated directory inside the data folder. The dedicated storage is not accessible to the user and is meant as a "cache" of the resources used to build the sketch.

When using the profile-based build, the globally installed platforms and libraries are excluded from the compile and can not be used in any way. In other words, the build is isolated from the system and will rely only on the resources specified in the profile: this will ensure that the build is portable and reproducible independently from the platforms and libraries installed in the system.

Using a default profile¶

If a default_profile is specified in the sketch.yaml then the “classic” compile command:

arduino-cli compile [sketch]

will, instead, trigger a profile-based build using the default profile indicated in the sketch.yaml.

Default flags for Arduino CLI usage¶

The sketch project file may be used to set the default value for some command line flags of the Arduino CLI, in particular:

The default_fqbn key sets the default value for the --fqbn flag
The default_programmer key sets the default value for the --programmer flag
The default_port key sets the default value for the --port flag
The default_port_config key sets the default values for the --config flag in the monitor command (available since Arduino CLI 1.1.0)
The default_protocol key sets the default value for the --protocol flag
The default_profile key sets the default value for the --profile flag

For example:

default_fqbn: arduino:samd:mkr1000
default_programmer: atmel_ice
default_port: /dev/ttyACM0
default_port_config:
  baudrate: 115200
default_protocol: serial
default_profile: myprofile

With this configuration set, it is not necessary to specify the --fqbn, --programmer, --port, --protocol or --profile flags to the arduino-cli compile, arduino-cli upload or arduino-cli debug commands when compiling, uploading or debugging the sketch. Moreover in the monitor command it is not necessary to specify the --config baudrate=115200 to communicate with the monitor port of the board.

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