Master the Raspberry Pi Pico in C: WiFi with lwIP & mbedtls

Computers & Technology

Fairhead, Harry

James, Mike

Networking & Cloud Computing

I/O Press

Inside the Grey Box: Upgrading and Building Your PC

Coker, P.D.

Hardware & DIY

QBASIC: the Language of MS-DOS 5 (The Programmers' Library)

James BSc FSS Grad IMA, Mike

Reference

QBASIC: the Language of MS-DOS (Programmers Library)

JavaScript Jems: The Amazing Parts

James, Dr Mike

Games & Strategy Guides

Computer science, specifically the theory of computation, deserves to be better known even among non-computer scientists. The reason is simply that it is full of profound thoughts and ideas. It contains some paradoxes that reveal the limits of human knowledge. It provides ways to reason about information and randomness that are understandable without the need to resort to abstract math. This is not an academic textbook but could be the precursor to reading an academic textbook. In Programmer's Guide to Theory, you will find the fundamental ideas of computer science explained in an informal and yet informative way. The first chapter sets the scene by outlining the challenges of understanding computational theory. After this the content is divided into three parts. The first explores the question "What is Computable?" introducing the Turing Machine, the Halting Problem and Finite State Machines before going on to consider the different types of computing model that are available and the languages they produce. This part also covers the different types of numbers and of infinities which paves the way for considering the topics of Kolmogorov Complexity and randomness, the Axiom of Choice, Godel's Incompleteness and the Lambda Calculus. Part II switches to lower-level concerns - from bits to Boolean logic covering information theory and error correction along the way. Part III dives deeper into computational complexity, considers polynomial-time versus exponential-time problems and then explores the benefits of recursion. It concludes with a discussion of NP (non-deterministic polynomial) versus P (polynomial) algorithms. Don't be put off by this list of unfamiliar concepts. This book sets out to lead you from one topic to the next so that the ideas are unfolded gradually. It does cover all the ideas that are fundamental to computer science, plus some that are not normally included but make things easier to understand, but does so in a very approachable, and even entertaining way. Mike James is editor of I-Programmer.info, an online magazine written by programmers for programmers. He has a BSc in Physics, an MSc in Mathematics and a PhD in Computer Science. His programming career spans several generations of computer technology but he keeps his skills completely up to date. As an author he has published dozens of books and hundreds of print articles, a tradition he now continues online.

The Programmer’s Guide To Theory: Great ideas explained

Computer Science

The BBC micro:bit is capable of taking on a variety of roles including that of a powerful IoT device. In order to gain full access to its features and to external devices, however, you need to use C which delivers the speed crucial to programs that communicate with the outside world. Written for the electronics enthusiast, micro:bit IoT In C starts with a first “Hello Blinky” C program with the mbed online compiler, we move to the desktop to using an offline approach using the yotta development environment plus NetBeans to make things even easier. Now we are ready to discover how to control the micro:bit’s I/O lines, exploring the basis of using the GPIO. For speed, however, we need to work directly with the raw hardware and also master memory mapping, pulse width modulation and other more sophisticated bus types. From here we can start connecting sensors using first the I2C bus, then by implementing a custom protocol for a one-wire bus, and eventually adding eight channels of 12-bit AtoD with the SPI bus, which involves overcoming some subtle difficulties. We then look at serial connections, one of the oldest ways of connecting devices but still very useful. The micro: bit lacks WiFi connectivity but using a low-cost device we enable a connection to the Internet via its serial port which allows it to become a server. To conclude we look at the micro:bit’s LED display. This may only be 5x5, but it is very versatile, especially when you use pulse width modulation to vary the brightness level, something we demonstrate in a classic game, written of course in C.

Micro:bit IoT In C

The Raspberry Pi makes an ideal match for the Internet of Things. But to put it to good use in IoT you need two areas of expertise, electronics and programming and because of the way hardware and software engineering tend to occupy separate niches you may need help with combining the two. This book teaches you to think like an IoT programmer.In Raspberry Pi IoT in C you will find a practical approach to understanding electronic circuits and datasheets and translating this to code, specifically using the C programming language. The main reason for choosing C is speed, a crucial factor when you are writing programs to communicate with the outside world. If you are familiar with another programming language, C shouldn't be hard to pick up. Here it is used in conjunction with NetBeans and with the bcm2835 library.The main idea in this book is to not simply install a driver, but to work directly with the hardware. So rather than using Raspberry Pi HATs or other expansion boards we use the Pi's GPIO (General Purpose Input Output) and connect off-the-shelf sensors. If you want to know how to work with the GPIO lines directly, how to work with near realtime Linux and generally take control of the Pi this is the book you need. It explains how to use the standard bus types - SPI, I2C, PWM - and with custom protocols including an in-depth exposition of the 1-wire bus. You will also discover how to put the Internet into the IoT using sockets and the low cost ESP8266.After reading this book you will be in a better position to tackle interfacing anything-with-anything without the need for custom drivers and prebuilt hardware modules.Having written a Blinky program to check that everything we need is installed and working we move on to exploring the basics of using the GPIO and also master memory mapping, pulse width modulation and other more sophisticated bus types. From here we can start connecting sensors, which is a core requirement for IoT. First we’ll meet the ubiquitous I2C bus, next we’ll implement a custom protocol for a one-wire bus, and eventually we’ll add eight channels of 12-bit AtoD with the SPI bus, which involves overcoming some subtle difficulties. Next we look at the traditional serial interface how to use it to communicate with other devices. This paves the way for getting the Pi on the web – after all this is a book about the Internet of Things -using first a USB WiFi adapter and sockets and then the low cost ESP8266, which is particularly useful with the Pi Zero which has only one USB port. Having transformed the Pi into both a web client and a web server we can then use them to exchange information.

Raspberry Pi IoT In C

Programming an Android app is an attractive proposition. Android increasingly dominates the global smartphone market, meaning many potential users. The devices are relatively cheap, making it suitable for implementing small scale projects. The tools you need to create an app are free to download and use and you don't need anyone's permission to get started. The only difficulty is that the Android is a tough system to master. It is easy enough to get started as Android Studio will build you a Hello World app in a few minutes, but what you do next is more difficult and create a good app you need a feel for how the system works and its limitations. Android Programming: Starting With An App not only shows you how common tasks are done in Android, but also explains why they are done in a particular way. Although Android development seems confusing at first, it has patterns which mean that having done something once you can generalize the approach to components you haven't previously encountered. There are plenty of examples in this book but they are deliberately simple, stripped down to their bare minimum to let you see what is essential. It isn't a complete treatment of everything Android. Instead if focuses on the things you need to know to write an app, in particular creating the user interface (UI) because this is what you spend most of your time working on even if the app in question is sophisticated. In this book you will find out how to build an app with a single Activity and a UI, a good foundation for further Android programming.

Android Programming: Starting with an App

Mike James

jQuery is a library of functions for JavaScript that provides easy and sophisticated access to the HTML in a web page. Originally intended to smooth over the differences in the way browsers interact with JavaScript, it has developed into a much more powerful tool that fully lives up to its motto of "write less, do more". As a result jQuery is compact and can seem cryptic until you get used its common idioms. Written for JavaScript developers working with web page layout, Just jQuery: The Core UI enables you to use jQuery easily and efficiently. It also cuts through its seeming complexity, by presenting enough explanation at every stage for you to understand what is happening. After outlining what jQuery is, how to obtain it and why you should use it, early chapters deal with the essential jQuery - its selectors, filters and DOM traversal functions. Next we look at how to modify existing HTML elements and how to create completely new elements. Next we look at more advanced aspects of the UI - storing data and working with forms. jQuery also provides simple animation functions and to understand these we look at function queues and asychronous animation. Adding custom elements, both to the jQuery UI and to jQuery itself, is the next major topic. The book closes with an explanation of how jQuery's unit testing package, QUnit, lets you write tests to make sure that your JavaScript code works and continues to work.

Just jQuery: The Core UI

Elliot, Ian

Web Development & Design

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