Sailor Hat for Raspberry Pi is a Raspberry Pi power management and CAN bus controller board for marine and automotive use.
The Sailor Hat circuit board includes an ATTiny1616 microcontroller (MCU) that, well, controls the hat functionality. This repository contains the MCU firmware implementing the Hat control functionality, including the I2C communications protocol.
The project is built using PlatformIO (PIO). PlatformIO should automatically fetch any dependencies and build the project.
A simple SerialUPDI programmer seems to be the best bet for flashing the MCU.
As of now (2022-11-20), the avrdude version provided by PlatformIO needs to
be updated to support the serialupdi protocol. Download and/or install
avrdude 7.0 or later and then copy avrdude and avrdude.conf to the
~/.platformio/packages/tool-avrdude-megaavr directory.
Flashing the device is also done using PlatformIO.
The flashing harness is documented at the Updating the firmware section of the documentation.
TODO: Document the I2C protocol
The internal operation of the firmware is controlled by a state machine. The state machine states and transitions are shown in the following diagram.
