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Manage the Arduino AVR boards

Install

To install the Arduino AVR boards,

  • Ensure Arduino-CLI is installed.

  • Open a Terminal window.

  • Run

$
arduino-cli core install arduino:avr

Upload

The Arduino Leonardo doesn’t rely on an external circuit for the serial over USB connection.

There are two steps for upload the executable to the board. First, the main computer turns the serial connection to 1200 bps to trigger the boot-loader. Then, the main computer enumerates the available serial ports and starts uploading.

The delay between the two steps can be adjusted. The default value is set to one second.

DELAY_BEFORE_UPLOAD = 1

  • Open the Arduino Leonardo.xcconfig board configuration file.

  • Edit the line with DELAY_BEFORE_UPLOAD and change the value.

DELAY_BEFORE_UPLOAD = 2

The values reported as successful are between one and three seconds.

  • Select the target All or Fast or Upload.

  • Press the button Run or press Cmd+B.