This repository contains the hardware design and firmware for fpx module.
Main enabling component of fpx is STUSB4500 standalone USB-PD IC by STMicroelectronics.
The rest are supporting components and an AVR ATtiny 816 which programs the NVM flash on STUSB4500 by converting configuration read from a light sensor.
The KiCad files are verified for manufacturing, and include all the part numbers.
The firmware is written as a single C file with no interrupts and provided as an Atmel Studio solution. It should however be easily buildable by GNU toolchain. The source is well commented and self-documenting.
The main configuration tool exists in the form of a web page. The Javascript part of the page documents the encoding used to transfer configuration using light flashes.
Due to its simplicity, the configuration tool can be ported to any device/platform that can pulse light with a reasonable timing accuracy (e.g. Arduino).
See my blog post about fpx and its predecessor fabpide2.