ALT Firmware for Sitka Instruments Gravity

This is a collection of alt firmware made for Sitka Instruments Gravity using the open source libGravity library. This library helps make writing firmware easier by abstracting away the initialization and peripheral interactions. Now your firmware code can just focus on the logic and behavior of the app, and keep the low level code neatly tucked away in this library.

https://git.sitkainstruments.com/awonak/libGravity

ALT-GRAVITY

This version of Gravity firmware is a full rewrite that leverages the libGravity hardware abstraction library. The goal of this project was to create an open source friendly version of the firmware that makes it easy for users/developers to modify and create their own original alt firmware implementations.

The libGravity library represents wrappers around the hardware peripherials to make it easy to interact with and add behavior to them. The library tries not to make any assumptions about what the firmware can or should do.

The Gravity firmware is a slightly different implementation of the original firmware. There are a few notable changes; the internal clock operates at 96 PPQN instead of the original 24 PPQN, which allows for more granular quantization of features like duty cycle (pulse width) or offset. Additionally, this firmware replaces the sequencer with a Euclidean Rhythm generator.

ENCODER:
     Press: change between selecting a parameter and editing the parameter.
     Hold & Rotate: change current selected output channel.

BTN1:
     Play/pause: start or stop the internal clock.

BTN2: 
     Shift: hold and rotate encoder to change current selected output channel.

EXT:
     External clock input. When Gravity is set to INTERNAL or MIDI clock
     source, this input is used to reset clocks.

CV1:
     External analog input used to provide modulation to any channel parameter.
CV2:
     External analog input used to provide modulation to any channel parameter.

NOTE: Make sure your Gravity module is disconnected from
the eurorack power and the MIDI expander before flashing.

WARNING: Flashing this firmware will erase any saved data
from your previously installed firmware!

Feedback

This is a beta release which may contain bugs, or have room for improvement. Your feedback is crutial to help ensure the new firmware is well received when it is officially published. We need your help to make this a success!

You can help by submitting Gitea issues here for bug reports, feedback, or any ideas you’ve got.

https://git.sitkainstruments.com/awonak/libGravity/issues

If you don’t want to submit feedback on the public Gitea site, feel free to shoot me an email at adam.wonak@gmail.com.