Android Hardware Interfacing with the BeagleBone Black
Design and implement Android apps that interface with your own custom hardware circuits and the BeagleBone Black
1. Auflage
Erschienen am 13. Januar 2025
134 Seiten
978-1-78439-345-8 (ISBN)
Beschreibung
Key FeaturesBook DescriptionIf you are an Android app developer who wants to experiment with the hardware capabilities of the BeagleBone Black platform, then this book is ideal for you. You are expected to have basic knowledge of developing Android apps but no prior hardware experience is required.What you will learn - Install Android on your BeagleBone Black Explore the three primary hardware interfaces of the BeagleBone Black-GPIO, SPI, and I2C Construct circuits that interface the BeagleBone Black with high-speed sensors, external memory chips, and more Discover the advantages and disadvantages of using GPIO, I2C, and SPI components in your interfacing projects Modify Android to recognize and interface with your own custom and prototype hardware Develop multithreaded apps that communicate directly with custom circuitry
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Inhalt
- Intro
- Android for the BeagleBone Black
- Table of Contents
- Android for the BeagleBone Black
- Credits
- About the Authors
- About the Reviewers
- www.PacktPub.com
- Support files, eBooks, discount offers, and more
- Why subscribe?
- Free access for Packt account holders
- Preface
- What this book covers
- What you need for this book
- Who this book is for
- Conventions
- Reader feedback
- Customer support
- Downloading the example code
- Errata
- Piracy
- Questions
- 1. Introduction to Android and the BeagleBone Black
- Looking back on Android and BeagleBone Black development
- Shopping for the hardware essentials
- The FTDI cable
- Power supply
- Breadboard and the mounting plate
- MicroSD cards
- Learning about the hardware you'll interface with
- General-purpose components
- The AdaFruit memory breakout board
- The AdaFruit sensor breakout board
- Preparing the breakout boards
- Installing Android on the BeagleBone Black
- Downloading a premade Android image
- Creating your Android microSD card using Windows
- Creating your Android microSD card using Linux
- Summary
- 2. Interfacing with Android
- Understanding the Android HAL
- Android managers
- The HAL development workflow
- Working with PacktHAL
- Installing PacktHAL
- Preparing PacktHAL under Linux
- Preparing PacktHAL under Windows
- The PacktHAL directory structure
- Preparing Android for PacktHAL
- Pushing PacktHAL files under Linux
- Pushing PacktHAL files under Windows
- Setting up the Android NDK for PacktHAL
- Adding the header to the NDK under Linux
- Adding the header to the NDK under Windows
- Multiplexing the BBB pins
- The kernel Device Tree and capemgr
- Defining a cape
- Summary
- 3. Handling Inputs and Outputs with GPIOs
- Understanding GPIOs
- Nuts and bolts of GPIO
- GPIO access methods under Android
- Pros and cons of the file I/O method
- Pros and cons of the memory-mapping method
- Preparing Android for GPIO use
- Building a GPIO-interfacing circuit
- Constructing the circuit
- Checking your wiring
- Including PacktHAL within your apps
- Understanding the Java Native Interface
- Creating a new app project that uses PacktHAL
- Building PacktHAL under Windows
- Building PacktHAL under Linux
- Exploring the GPIO example app
- Installing the app and source under Windows
- Installing the app and source under Linux
- The app's user interface
- Calling the PacktHAL functions
- Using the PacktHAL GPIO functions
- Summary
- 4. Storing and Retrieving Data with I2C
- Understanding I2C
- Devices that use I2C
- Multiplexing for I2C on the BBB
- Connecting to I2C via the P9 header
- Multiplexing for I2C
- Representing I2C devices in the Linux kernel
- Preparing Android for FRAM use
- Building an I2C-interfacing circuit
- Connecting the FRAM
- Checking the FRAM connection with I2C tools
- Exploring the I2C FRAM example app
- The app's user interface
- Calling the PacktHAL FRAM functions
- Understanding the AsyncTask class
- Learning the details of the HardwareTask class
- Summary
- 5. Interfacing with High-speed Sensors Using SPI
- Understanding SPI
- Multiplexing for SPI on the BBB
- Representing SPI devices in the Linux kernel
- Preparing Android for SPI sensor use
- Building an SPI interface circuit
- Connecting the sensor
- Exploring the SPI sensor example app
- The app's user interface
- Calling the PacktHAL sensor functions
- Using the HardwareTask class
- Summary
- 6. Creating a Complete Interfacing Solution
- Building the complete interface circuit
- Exploring the complete example app
- The app's user interface
- Understanding hardware polling in an app
- Using AsyncTask with long-lived threads
- Using the HardwareTask class
- Summary
- 7. Where to Go from Here
- Integrating your solution with Android
- Creating a custom kernel and Device Tree
- Adding hardware communication into the kernel
- Integrating into existing managers
- Creating new managers for custom hardware
- Combining your project with other hardware
- Constructing your own prototype capes
- Commercial capes that interface with Android
- Exploring the BBB's other interfaces
- Programmable real-time units
- Serial communications
- Controller area network
- The analog-to-digital converter
- Pulse width modulation
- Summary
- Index
