Moto Mods Development Basics

payam

8 Aug 2016

Moto Mods are hardware enhancements

Snap seamlessly to the rear of the Moto Z
- Magnets provide a strong attraction
- Hotplug, no reboot needed
Provide a wide variety of interfaces to enable 3rd party creativity
- Enhance existing functionality, like battery life
- Introduce entirely new features
Tight integration into Android OS
- Utilize standard behaviors and interfaces
- SDK to allow for unique experiences

Mechanical

Fixed dimensions for future generations ensure compatibility.

Capabilities

Interface	Capabilities
I2C	1 Mbit/s
SPI	15 Mbit/s
UART	10 Mbit/s
CSI	6MP raw10 @ 60fps, 13MP raw10 @ 24fps
I2S	24-bit stereo @ 192kHz
DSI	1080p @ 60fps
MyDP	Video: 4K @ 30fps, Audio: 8 channels @ 192kHz
USB2.0	480 Mbit/s
USB3.1	5 Gbit/s
GPIO	General Purpose Input and Output

Brains and Brawn

Moto Mods Micro Controller (MuC)	Motorola High Speed Bridge (Moto Bridge)
Contained in every Moto Mod Provides command and control Enumeration Greybus Protocols Moto Bridge management Power Management Firmware Upgrades Low Speed Interfaces I2C, SPI, UART, GPIO Analog to Digital Converters ARM7 Cortex-M4F	Provides high speed interfaces at low power Simultaneous support of DSI, CSI, I2S, and HSIC Powered on and off as required Firmware is upgraded by MuC MHB protocol allows MuC to control Moto Bridge functionality without modifying firmware UART connection to MuC Not required in all Moto Mods

Greybus Protocols

Display	Configuring and controlling a DSI or MyDP video device
Lights	Display Backlight Control
Battery	Battery Metering
Power Transfer	Charge/Discharge to Moto Z
Audio	Configuring and controlling I2S audio streams (raw or over Moto Bridge)
HID	Human Interface Device input
USB-Ext	USB 2.0 (device) or USB 3.1 (host/device)
Raw	Application specific data pipe

Moto Z Behavior

Display	Integrated as Android Secondary Display. Mirroring by default, or use Presentation
Lights	No default integration
Battery	Integrated battery metering
Power Transfer	Moto Mod reports current capabilities, Moto Z controls state transitions
Audio	Audio device types mirror Android. Default routing rules based on current device(s).
HID	Keyboard input provided to the frontmost app, normal mouse integration
USB-Ext	USB devices available through Android USBManager (if they don’t just work)
Raw	No default integration, but Permissions required for ‘Unrestricted Mod Access’

Moto Mods Development Kit (MDK)

Contains MuC and Moto Bridge
Integrated battery and charging circuit
Perforated Boards enable flywired projects
Personality Cards provide hardware to go with the examples, including released schematics
80pin interface allows easy swapping
USB Ports for Serial Wire Debug/Console, power, data, and MyDP

MDK Users Guide

Perforated Board

HAT Adapter Board