Book Image

Creative DIY Microcontroller Projects with TinyGo and WebAssembly

By : Tobias Theel
Book Image

Creative DIY Microcontroller Projects with TinyGo and WebAssembly

By: Tobias Theel

Overview of this book

While often considered a fast and compact programming language, Go usually creates large executables that are difficult to run on low-memory or low-powered devices such as microcontrollers or IoT. TinyGo is a new compiler that allows developers to compile their programs for such low-powered devices. As TinyGo supports all the standard features of the Go programming language, you won't have to tweak the code to fit on the microcontroller. This book is a hands-on guide packed full of interesting DIY projects that will show you how to build embedded applications. You will learn how to program sensors and work with microcontrollers such as Arduino UNO and Arduino Nano IoT 33. The chapters that follow will show you how to develop multiple real-world embedded projects using a variety of popular devices such as LEDs, 7-segment displays, and timers. Next, you will progress to build interactive prototypes such as a traffic lights system, touchless hand wash timer, and more. As you advance, you'll create an IoT prototype of a weather alert system and display those alerts on the TinyGo WASM dashboard. Finally, you will build a home automation project that displays stats on the TinyGo WASM dashboard. By the end of this microcontroller book, you will be equipped with the skills you need to build real-world embedded projects using the power of TinyGo.
Table of Contents (13 chapters)

Finding heap allocations

The TinyGo compiler toolchain tries to optimize code in such a way that no heap allocations are left in the result, but some allocations cannot be optimized. Is there a way to know which those allocations are? Yes! We can deactivate the garbage collector (GC) by passing a flag to the build and flash commands.

When the GC is deactivated, the compilation process is going to fail and throws an error, which points to the line of code that caused a heap allocation. Let's check out the following code example, which causes a heap allocation:

package main
var myString *string
func main() {
            value := "my value"
            myString = &value

When building this program, we will have the GC deactivated with the following command:

tinygo build -o Appendix/allocations/hex --gc=none --target=arduino Appendix...