Bare-metal programming on Raspberry Pi 4

HeaRTOS is a minimal Real Time Operating System designed to be the core of more complex systems

Standard C and C++ Library Support for Circle

Multiarchitecture baremetal examples for testing in QEMU

Baremetal apps for MCom-03 MIPS RISC0, ARM CPU

Embedded firmware for ham radio transceivers

Blesniff is a Bluetooth Low Energy (Bluetooth LE) sniffer for nRF5340 modules.

Baremetal C Driver for a NTC temperature sensor running on a STM32F411RE board

Low-level peripheral drivers for STM32F4xx, written in pure C — no HAL, no CubeMX, full register-level control.

Something almost but not quite entirely unlike OS

usb loader for rockchip SOC in maskrom mode

Configuring BLE and sending data over UART | STM32F103c8T6 (Arm Cortex M3)

Displaying Temperature in LCD from sensor using I2C driver(TWI interface) | ATMega328P - bare metal programming

RGB Led with Arduino Nano | Multiple colors

STM32F103C8T6 | Blinking LED with own header file

Creating delay using Timer Interrupt in Arm Cortex M3

DMA for UART in STM32F103C8T6 - ARM Cortex M3

disassembler for arm32 and x86

Simple filesystem meant for baremetal/kernel use.

A completely-from-scratch hobby operating system: bootloader, kernel, drivers, C library, and userspace including a composited graphical UI, dynamic linker, syntax-highlighting text editor, network stack, etc.