Vercel Composition Patterns
supabase/supabase
React composition patterns that scale. An agent skill from supabase/supabase.
MMIO and register access skill for bare-metal firmware. An agent skill from mohitmishra786/low-level-dev-skills.
Install Mmio And Bit Manipulation
$ npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mohitmishra786/low-level-dev-skills mmio-and-bit-manipulation --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/baremetal/mmio-and-bit-manipulation .claude/skills/mmio-and-bit-manipulation && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "mmio-and-bit-manipulation" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/mmio-and-bit-manipulation into .claude/skills/mmio-and-bit-manipulation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mmio-and-bit-manipulation", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/mmio-and-bit-manipulationType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mohitmishra786/low-level-dev-skills mmio-and-bit-manipulation --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/baremetal/mmio-and-bit-manipulation .agents/skills/mmio-and-bit-manipulation && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mmio-and-bit-manipulation" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/mmio-and-bit-manipulation into .agents/skills/mmio-and-bit-manipulation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mmio-and-bit-manipulation", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mohitmishra786/low-level-dev-skills mmio-and-bit-manipulation --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/baremetal/mmio-and-bit-manipulation .cursor/skills/mmio-and-bit-manipulation && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "mmio-and-bit-manipulation" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/mmio-and-bit-manipulation into .cursor/skills/mmio-and-bit-manipulation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mmio-and-bit-manipulation", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mohitmishra786/low-level-dev-skills.git --path skills/baremetal/mmio-and-bit-manipulation--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mohitmishra786/low-level-dev-skills mmio-and-bit-manipulation --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/baremetal/mmio-and-bit-manipulation .gemini/skills/mmio-and-bit-manipulation && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "mmio-and-bit-manipulation" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/mmio-and-bit-manipulation into .gemini/skills/mmio-and-bit-manipulation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mmio-and-bit-manipulation", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mohitmishra786/low-level-dev-skills mmio-and-bit-manipulationInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/baremetal/mmio-and-bit-manipulation .github/skills/mmio-and-bit-manipulation && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "mmio-and-bit-manipulation" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/mmio-and-bit-manipulation into .github/skills/mmio-and-bit-manipulation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mmio-and-bit-manipulation", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mohitmishra786/low-level-dev-skills mmio-and-bit-manipulation --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/baremetal/mmio-and-bit-manipulation .opencode/skills/mmio-and-bit-manipulation && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "mmio-and-bit-manipulation" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/mmio-and-bit-manipulation into .opencode/skills/mmio-and-bit-manipulation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mmio-and-bit-manipulation", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
mmio-and-bit-manipulation- GitHub stars
- 252
- Token cost
- ~1.1k tokens
- SKILL.md length
- 264 words
- Files
- 1
- Skills in repo
- 138
- Repo updated
- First seen
- Licence
- MIT
At a glance
MMIO and register access skill for bare-metal firmware. An agent skill from mohitmishra786/low-level-dev-skills.
- Works in 6 steps: MMIO fundamentals → Read-modify-write macros → Bitfield pitfalls → …
- Accessing memory-mapped peripherals with volatile
- SKILL.md covers Purpose, When to Use, Workflow and Common Problems, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Mmio And Bit Manipulation is an agent skill from mohitmishra786/low-level-dev-skills. MMIO and register access skill for bare-metal firmware. Use when accessing memory-mapped peripherals with volatile, bit masks, RMW patterns, or endianness concerns. Activates on queries about MMIO, volatile register, bit manipulation, read-modify-write, or register alignment.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development. The repository describes itself as: A curated suite of AI agent skills for systems and low-level programming with C/C++, Rust, and Zig toolchains, covering compilers, debuggers, profilers, build systems…. The licence is MIT.
When your agent uses it
- Accessing memory-mapped peripherals with volatile
- Endianness concerns
Example prompts
- “/mmio-and-bit-manipulation”
Workflow steps
6 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit bdc5847. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are c).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Mmio And Bit Manipulation loads about 1.1k tokens when it runs. Until then it costs about 76 tokens; SKILL.md has 264 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from mohitmishra786/low-level-dev-skills at commit bdc5847, republished under its MIT licence (© mohitmishra786). 264 words, ~1,067 tokens.
Download SKILL.mdSave it as
.claude/skills/mmio-and-bit-manipulation/SKILL.md (or your agent's skills folder).- name
- mmio-and-bit-manipulation
- description
- MMIO and register access skill for bare-metal firmware. Use when accessing memory-mapped peripherals with volatile, bit masks, RMW patterns, or endianness concerns. Activates on queries about MMIO, volatile register, bit manipulation, read-modify-write, or register alignment.
MMIO and Bit Manipulation
Purpose
Guide agents through safe memory-mapped I/O: volatile semantics, read-modify-write patterns, bitfield pitfalls, alignment and endianness, and portable register access macros for bare-metal drivers.
When to Use
- Writing peripheral register drivers without HAL
- Fixing intermittent register corruption or stale reads
- Replacing C bitfields with explicit masks
- Porting drivers between little-endian MCUs
- Auditing ISR vs main-line register access
Workflow
1. MMIO fundamentals
Peripheral registers live at fixed addresses in the CPU memory map. The compiler must not cache reads/writes.
#include <stdint.h>
#define PERIPH_BASE 0x40000000U
#define GPIOA_MODER (*(volatile uint32_t *)(PERIPH_BASE + 0x20000U))| Qualifier | Effect |
|---|---|
volatile | Forces load/store each access — required for hardware |
const volatile | Read-only hardware (rare) |
Plain uint32_t * | Wrong — compiler may optimize away |
2. Read-modify-write macros
#define REG32(addr) (*(volatile uint32_t *)(addr))
#define REG_SET(addr, mask) (REG32(addr) |= (mask))
#define REG_CLR(addr, mask) (REG32(addr) &= ~(mask))
#define REG_TOGGLE(addr, mask) (REG32(addr) ^= (mask))
#define REG_WRITE(addr, val) (REG32(addr) = (val))
#define REG_READ(addr) (REG32(addr))Good — atomic intent for single-bit updates when register supports it:
#define GPIOA_BSRR REG32(0x40020018U)
GPIOA_BSRR = (1U << 5); /* set PA5 */
GPIOA_BSRR = (1U << (5+16)); /* reset PA5 — STM32 BSRR pattern */Bad — non-atomic RMW on interrupt-shared registers:
uint32_t v = REG_READ(GPIOA_MODER);
v |= (1U << 10);
REG_WRITE(GPIOA_MODER, v); /* ISR may interleave — lost update */Fix: disable IRQ briefly, use hardware set/clear registers, or LL atomic bitband if available.
3. Bitfield pitfalls
/* Bad — layout is implementation-defined, not portable */
typedef struct {
uint32_t mode : 2;
uint32_t type : 1;
uint32_t speed : 2;
} gpio_moder_bits_t;Prefer explicit masks:
#define GPIO_MODER_MODE0_SHIFT 0
#define GPIO_MODER_MODE0_MASK (3U << GPIO_MODER_MODE0_SHIFT)
#define GPIO_MODER_MODE0_VAL(n) ((n) << GPIO_MODER_MODE0_SHIFT)
REG32(GPIOA_MODER) = (REG32(GPIOA_MODER) & ~GPIO_MODER_MODE0_MASK)
| GPIO_MODER_MODE0_VAL(1); /* output */4. Endianness and alignment
- Cortex-M and most MCUs: little-endian —
uint32_tMMIO at word-aligned addresses - Unaligned
uint32_taccess may fault on ARMv7-M+ - 8-bit registers: use
volatile uint8_twith correct byte lane address
#define REG8(addr) (*(volatile uint8_t *)(addr))5. Memory barriers (when needed)
/* After configuring peripheral before first use */
__DSB();
__ISB();
/* After DMA setup, before enabling channel */
__DMB();Use CMSIS barriers (core_cm4.h) on Cortex-M.
6. Agent usage examples
/mmio-and-bit-manipulation Safe pattern to set bit 3 without affecting other bits in ISR context
/mmio-and-bit-manipulation Why must peripheral pointers be volatile?Common Problems
| Symptom | Cause | Fix |
|---|---|---|
| Register write ignored | Wrong address/clock gated | Enable peripheral clock first |
| Random bit flips | RMW race with ISR | BSRR-style atomic regs or critical section |
| HardFault on access | Unaligned or protected bus | Match access width to datasheet |
| Optimized-away read | Missing volatile | Use volatile uint32_t |
| Bitfield wrong value | Compiler packs unexpectedly | Use shift/mask macros |
Related Skills
skills/baremetal/peripherals-from-datasheet— extracting register mapsskills/baremetal/gpio-baremetal— GPIO register patternsskills/low-level-programming/assembly-arm— inline asm barriersskills/embedded/linker-scripts— peripheral memory map regions
© mohitmishra786, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/baremetal/mmio-and-bit-manipulation of mohitmishra786/low-level-dev-skills.
Open the folder on GitHubat commit bdc5847
Compare with similar skills
Mmio And Bit Manipulation next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Mmio And Bit Manipulation this skillmohitmishra786/low-level-dev-skills | 252 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Vercel Composition Patternssupabase/supabase | 111k | 58 repos | ~726 | Automated safety check: Pass | MIT | |
| Finishing a Development Branchobra/superpowers | 297k | 5 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| PR Babysitteropeninterpreter/openinterpreter | 69k | 3 repos | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 4 repos | ~1.1k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Mmio And Bit Manipulation
What does Mmio And Bit Manipulation do?
MMIO and register access skill for bare-metal firmware. An agent skill from mohitmishra786/low-level-dev-skills. Mmio And Bit Manipulation is an agent skill from mohitmishra786/low-level-dev-skills. MMIO and register access skill for bare-metal firmware.
When should I use Mmio And Bit Manipulation?
Mmio And Bit Manipulation fits situations like: accessing memory-mapped peripherals with volatile; endianness concerns.
How do I install Mmio And Bit Manipulation in Claude Code?
Run `npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a claude-code`. Or copy the skill folder (skills/baremetal/mmio-and-bit-manipulation in mohitmishra786/low-level-dev-skills) into .claude/skills/mmio-and-bit-manipulation in your project. Claude Code loads it when a task matches its description.
How do I install Mmio And Bit Manipulation in Codex?
Run `npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a codex`. Or copy the skill folder (skills/baremetal/mmio-and-bit-manipulation in mohitmishra786/low-level-dev-skills) into .agents/skills/mmio-and-bit-manipulation in your project. Codex loads it when a task matches its description.
Can I use Mmio And Bit Manipulation in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mohitmishra786/low-level-dev-skills --skill mmio-and-bit-manipulation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mmio-and-bit-manipulation, .gemini/skills/mmio-and-bit-manipulation, .github/skills/mmio-and-bit-manipulation and .opencode/skills/mmio-and-bit-manipulation in your project.
What does Mmio And Bit Manipulation need to run?
SKILL.md names no scripts, command-line tools or credentials: Mmio And Bit Manipulation is instructions for the agent only.
Does Mmio And Bit Manipulation access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Mmio And Bit Manipulation safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Mmio And Bit Manipulation use?
Mmio And Bit Manipulation is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Mmio And Bit Manipulation use?
About 1.1k tokens (SKILL.md is roughly 4.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Mmio And Bit Manipulation?
Skills that share tags, products or a category with Mmio And Bit Manipulation: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Mmio And Bit Manipulation?
mohitmishra786 (a GitHub user) maintains it in mohitmishra786/low-level-dev-skills, which has 252 GitHub stars. The repository holds 138 skills in this directory. The repository was last updated on June 27, 2026.
Source: mohitmishra786/low-level-dev-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.