Barebones AVR128Dx avr-gcc Project

This is a basic skeleton for programming the AVR128Dx series MCUs using avr-gcc. (If you use Arduino, see the comprehensive DxCore, instead).

1. Install prerequisites
2. Download the appropriate Microchip "ATPACK" for your MCU
3. make help ; make vars

ℹ️ Don't have a programmer? Neither did I! If you have a spare mcu with USB serial facilities, you can make your own with a single passive component and a handful of jumper wires in minutes! See doc/PROGRAMMER.md for more info.

I tossed this together in a rush. If you run into issues, feel free to create an issue or PR a fix. Thanks!

Prerequisites

• avr-gcc
• pymcuprog
• make

Instructions

1. Install the prerequisites (Mac: brew install avr-gcc make ; pip3 install pymcuprog)
2. Download the appropriate Microchip "ATPACK" for your MCU.
3. Extract the atpack (it's a zip file), e.g. unzip /path/to/Atmel.AVR-Dx_DFP.2.2.253.atpack -d /path/to/Atmel.AVR-Dx_DFP.2.2.253_atpack

Then:

ATPACK="/path/to/Atmel.AVR-Dx_DFP.2.2.253_atpack" \
USBDEVICE="/dev/tty.usb<whatever>" \
make upload

Usage

The ATPACK and USBDEVICE environment variables are required. The default architecture is avr128da28 (because that's what I have on hand). You can change this using the DEVICE environment variable.

• make help for target information.
• make vars for env variables.

Wait.."atpack"?

⚠️ If your avr-gcc is built with avr128dx support, skip the atpack stuff and delete any lines that contain ATPACK from the Makefile.

See Supporting "unsupported" Devices in the avr-gcc Wiki for more info.