A step-by-step guide to building and booting a clean base Yocto image for the Raspberry Pi Zero 2W

Building a Base Yocto Image for Raspberry Pi Zero 2W

A beginner's guide to setting up your environment for the SmartThings API. This post covers generating tokens and making your first API calls.

Getting Started with the SmartThings API - Environment Setup

A step-by-step guide to creating and integrating a custom meta-layer to manage your own recipes and configurations in a Yocto build for the Raspberry Pi Zero 2W

Creating a Custom Yocto Layer for Raspberry Pi Zero 2W

A guide to creating custom image recipes and distribution configurations in your own Yocto layer, eliminating the need for manual local.conf edits

Defining Custom Image and Distro for Raspberry Pi Zero 2W

A step-by-step guide to configuring Yocto recipes and hardware setup for the GT911 touch controller

Enabling GT911 Touchscreen on Raspberry Pi Zero 2W with Yocto

 A step-by-step guide to enabling the SPI interface and configuring Yocto recipes for E-Paper displays

Enabling E-Ink Display on Raspberry Pi Zero 2W with Yocto

Understanding and using the $RANDOM internal variable in Bash, including its open-source implementation

Bash $RANDOM Variable

A guide to configuring a Docker build environment, syncing repositories, and compiling a custom ROM for the n5110

Building LineageOS 14.1 for Samsung Galaxy Note 8.0 (n5110)

Explore the internal process and usage of gcc attributes: constructor (pre-main execution) and destructor (post-main execution).

gcc attribute: constructor & destructor

A guide to flashing the compiled LineageOS 14.1 ROM and recovery image to the Samsung Galaxy Note 8.0 (n5110).

Flashing LineageOS 14.1 for Samsung Galaxy Note 8.0 (n5110)

Explore the -Wformat option in GCC to detect format string errors and security vulnerabilities at compile time.

gcc options: -Wformat

The cleanup attribute runs a function when a variable goes out of scope. This attribute can only be applied to auto function scope variables.

gcc attribute: cleanup

Exploring why NULL and 0 are not equivalent in GNU C through pre-processor results and memory analysis.

NULL != 0

The nonnull attribute specifies that some function parameters should be non-null pointers. This allows the compiler to check at compile-time if a null pointer is passed to these arguments.

gcc attribute: nonnull

A guide to understanding and using the -fsigned-char and -funsigned-char GCC options to control the signedness of plain char.

gcc options: -fsigned-char

The alloca() function allocates size bytes of space in the stack frame of the caller. This temporary space is automatically freed when the function that called alloca() returns to its caller.

gcc builtin: alloca

You can use the built-in function __builtin_choose_expr to evaluate code depending on the value of a constant expression. This built-in function returns exp1 if const_exp, which is an integer constant expression, is nonzero. Otherwise it returns exp2.

gcc builtin: choose_expr

The format attribute specifies that a function takes printf, scanf, strftime or strfmon style arguments which should be type-checked against a format string.

# smartthings