mohitmishra786/low-level-dev-skills

ADC And DAC Bare Metal configures ADC sampling, calibration, DMA circular buffers, and DAC output on microcontrollers. Use it for reading analog sensors, continuous sampling, or generating analog voltages.

AF XDP guides setup of userspace packet I/O with UMEM, XSK rings, and XDP_REDIRECT programs. Use it when building fast network datapaths, choosing copy versus zero-copy mode, or comparing AF XDP with DPDK.

Bare-Metal Startup guides reset-to-main bring-up for embedded targets. Use it for vector tables, .data/.bss initialization, stack setup, VTOR relocation, and crt0 startup code on Cortex-M or RISC-V.

Bazel guides C/C++ build setup with BUILD files, cc_library and cc_binary rules, Bzlmod dependencies, toolchains, queries, remote execution, and sandbox debugging. Use it when creating or troubleshooting Bazel builds.

Build Acceleration helps reduce C/C++ compile and link times using ccache, sccache, distcc, unity builds, precompiled headers, split DWARF, and IWYU. Use it when builds are slow or you need to find the main bottleneck.

Custom Allocators guides allocator design and tuning for pool, slab, arena, and general-purpose memory management. Use it when implementing custom allocators, adjusting jemalloc or mimalloc, or benchmarking fragmentation and throughput.

DMA Bare Metal configures DMA channels and streams for memory-to-peripheral or peripheral-to-memory transfers. Use it for circular buffers, double buffering, transfer-complete interrupts, and Cortex-M cache coherency issues.

DPDK guides userspace packet I/O setup for EAL initialization, PMD configuration, mbuf pools, rte_ring queues, huge pages, RSS, and testpmd validation. Use it when building or testing high-throughput packet processing with DPDK.

Datasheet and Reference Manual Reading teaches a systematic way to extract pinouts, register maps, clock trees, timing, and errata from MCU documentation. Use it when locating information in an STM32 RM or checking electrical and reset behavior before firmware work.

Dynamic Linking guides Linux ELF shared-library debugging and configuration. Use it for RPATH versus RUNPATH, soname versioning, dlopen/dlsym plugin loading, LD_PRELOAD interposition, and symbol visibility issues.

Elf Inspection guides inspection of Linux ELF executables and shared libraries with tools like readelf, objdump, nm, and ldd. Use it to check symbols, sections, dependencies, debug info, build IDs, relocations, and linker or runtime symbol errors.

Embedded Bootloaders guides vector table relocation, valid image checks, and safe jump-to-application flow on Cortex-M MCUs. Use it for custom bootloaders, DFU updates, or apps that run from a non-zero flash address.

GNU Binutils guides binary manipulation with tools like ar, strip, objcopy, addr2line, strings, and c++filt. Use it for static libraries, debug-file handling, address-to-source lookup, and symbol demangling.

GPIO Bare-Metal configures MCU GPIO without HAL for input/output modes, alternate functions, pull resistors, and pin-change interrupts. Use it for LED, button, and peripheral pin setup on STM32, nRF52, or ESP32-class boards.

Interrupts And Exceptions guides bare-metal Cortex-M interrupt setup, ISR rules, and fault handling. Use it for NVIC priorities, HardFault debugging, critical sections, and interrupt latency tuning.

Io Uring guides agents through Linux io_uring, including SQE/CQE usage, liburing, multi-shot accept/recv, provided buffers, fixed files, and zero-copy send. Use it when building high-throughput Linux services or comparing io_uring with epoll.

Linkers and LTO helps configure GNU ld, gold, or lld, diagnose link-order and undefined-symbol errors, and enable LTO safely in real builds. Use it when tuning linker flags, dead-code stripping, or symbol visibility.

Low-Power Embedded guides MCU sleep, stop, and standby setup, plus clock gating and wake-up source configuration. Use it when reducing firmware current draw or debugging wake-from-sleep behavior.

MMIO and Bit Manipulation guides safe memory-mapped I/O for bare-metal firmware. Use it when reading or writing hardware registers with volatile access, masks, read-modify-write patterns, alignment, or endianness concerns.

NUMA Programming guides process and memory placement on multi-socket systems. Use it to detect topology, bind workloads with numactl, call libnuma, and measure remote memory access costs.

Peripherals From Datasheet guides writing MCU peripheral drivers from reference manuals by reading register maps, init sequences, and timing notes. Use it when porting or debugging register-level drivers without a vendor HAL.

SPI and I2C Bare Metal shows how to implement master-mode SPI and I2C transactions without a HAL. Use it for sensor register reads, flash/display bring-up, and debugging NACKs, CPOL/CPHA mismatches, or stuck bus lines.

STM32 Bare-Metal guides CMSIS-only STM32 firmware bring-up without HAL, including clock setup, peripheral register access, and linker/build configuration. Use it when scaffolding minimal STM32 projects or debugging low-level startup issues.

Timers And Pwm configures bare-metal MCU timers for PWM output, input capture, and periodic ticks without an RTOS. Use it when setting prescalers, ARR/CCR values, or SysTick for simple scheduling.

UART Serial Bare-Metal covers baud rate setup, polling or interrupt-driven TX/RX, and basic DMA use for UART/USART on bare-metal systems. Use it for serial console output, sensor links, or fixing garbled debug text.