ATmega328 Internal clock

Development Platforms
1

I have been using PlatformIO for a while, and with great success. However I have hit my first stumble.
I wish to use the ATmega328p with the internal clock.

Normally I would Download a file, “breadboard-1-6-x.zip” open it into a ARDUINO sketchbook folder marked “hardware”. After doing this there is a new board in the menu of the arduino IDE marked BREADBOARD.

Lastly I select “arduinoISP” and use an arduino UNO to load sketches up to the arduino chip. Is there a way of doing this in PIO? If so anyone got an Idea as to how?
I am includeing a video of how I do this in a link Incase I am not clear as I need to be.

Video Here.

:roll_eyes::tired_face:

2

For uploading with arduino ISP see Atmel AVR — PlatformIO latest documentation, section “Upload using Programmer”.

The easiest way to use your breadboard Arduino would be to find the closest board in the list of ATMega328P boards listed at PlatformIO Registry (type in “ATMega328P” for MCU) and then just use board = xyz in your platformio.ini.

If your unique configuration is not found within these boards, you have the following options:

For clock configuration, see e.g. Arduino Uno — PlatformIO latest documentation, board_build.f_cpu = ....

To reproduce the “Breadboad, internal 8MHz” version (with 3.3V or 5V?), you might want to create a new board definition. See e.g. platform-atmelavr/uno.json at develop · platformio/platform-atmelavr · GitHub. But first I’d see if your configuration already exists.

The boards.txt in your breadboard-1-6-x.zip states

##############################################################

atmega328bb.name=ATmega328 on a breadboard (8 MHz internal clock)

atmega328bb.upload.protocol=arduino
atmega328bb.upload.maximum_size=30720
atmega328bb.upload.speed=57600

atmega328bb.bootloader.low_fuses=0xE2
atmega328bb.bootloader.high_fuses=0xDA
atmega328bb.bootloader.extended_fuses=0x05

atmega328bb.bootloader.file=atmega/ATmegaBOOT_168_atmega328_pro_8MHz.hex
atmega328bb.bootloader.unlock_bits=0x3F
atmega328bb.bootloader.lock_bits=0x0F

atmega328bb.build.mcu=atmega328p
atmega328bb.build.f_cpu=8000000L
atmega328bb.build.core=arduino:arduino
atmega328bb.build.variant=arduino:standard


atmega328bb.bootloader.tool=arduino:avrdude
atmega328bb.upload.tool=arduino:avrdude

So you should be able to reproduce these settings (fuses, cock speed) with the links I gave you above. Also see Custom Embedded Boards — PlatformIO latest documentation.

3

A build environment of …

[env:Breadboard ATMega328]
platform = atmelavr
board = 328p8m
framework = arduino

… will work with a Atmega328 that is running on a 8Mhz crystal, or a 8Mhz internal clock. It looks like one of the supported upload methods is an Arduino programmed as a ISP (ArduinoISP), so you can add…

upload_protocol = arduinoisp

… to the above platformio.ini config, making the only thing left to do is set the fuses on the Atmega328 correctly. Don’t know if that is readily doable in platformio - probably, since you can also pass parameters to avrdude via upload_flags, but I’m not sure what to set there as I usually use avrdudess on Windows to do my fuse settings and first upload of a compiled arduino sketch (which includes the serial bootloader).

4

Do you use pio run -t program?

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5

Er, no, I didn’t… doing that makes the verification error go away nicely! Thanks! :wink: I’ve also since found the extra_scripts notation about custom fuses, so have also done that. Final step will be to try uploading to a fresh atmega328p and see if the fuses are correctly changed when code is loaded onto it…

6

See docs => Atmel AVR — PlatformIO latest documentation

Happy coding with PlatformIO! :wink:

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