Atmel megaAVR¶

Upload using Programmer¶

In the case of external programmers, it’s easy to brick a board simply by specifying incorrect upload flags. It’s highly recommended to use the upload_command option that gives the full control over flags used for uploading. Please read Upload using Programmer for more information.

pip install https://github.com/mraardvark/pyupdi/archive/master.zip

[env:ATmega3209_pyupdi_upload]
platform = atmelmegaavr
framework = arduino
board = ATmega3209
upload_speed = 115200
upload_flags =
    -d
    mega3209
    -c
    $UPLOAD_PORT
    -b
    $UPLOAD_SPEED
upload_command = pyupdi $UPLOAD_FLAGS -f $SOURCE

Fuses programming¶

PlatformIO has a built-in target called fuses for setting fuse bits. The default fuse bits are predefined in the board manifest file in the fuses section. For example, fuses section for Arduino Nano Every board. To set fuse bits you need to use target fuses with pio run --target command.

[env:custom_fuses]
platform = atmelmegaavr
framework = arduino
board = ATmega3209
upload_protocol = xplainedmini_updi
board_fuses.bootend = 0xAA
board_fuses.syscfg0 = 0xBB
board_fuses.osccfg = 0xCC

Bootloader programming¶

PlatformIO has a built-in target called bootloader for flashing bootloaders. The default bootloader image and corresponding fuse bits are predefined in the board manifest file in the bootloader section, for example, Arduino Uno WiFi Rev2. To upload a bootloader image you need to use target bootloader with pio run --target command.

[env:ATmega4808]
platform = atmelmegaavr
framework = arduino
board = ATmega4808

board_bootloader.file = /path/to/custom/bootloader.hex
board_bootloader.bootend = 0xFF
board_bootloader.syscfg0 = 0xDE
board_bootloader.osccfg = 0xFD
board_bootloader.lock_bits = 0x0F

Stable¶

; Latest stable version
[env:latest_stable]
platform = atmelmegaavr
board = ...

; Custom stable version
[env:custom_stable]
platform = atmelmegaavr@x.y.z
board = ...

Upstream¶

[env:upstream_develop]
platform = https://github.com/platformio/platform-atmelmegaavr.git
board = ...

Arduino¶

Microchip¶