Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add mohitmishra786/low-level-dev-skills --skill gpio-baremetalgit clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/gpio-baremetal)<a href="https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/gpio-baremetal"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/gpio-baremetal/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mohitmishra786/low-level-dev-skills/gpio-baremetal"><img src="https://agentmods.dev/badge/skills/mohitmishra786/low-level-dev-skills/gpio-baremetal.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00066 | $0.00893 |
| Opus 5 | $0.00033 | $0.00447 |
| Sonnet 5 | $0.00013 | $0.00179 |
| Haiku 4.5 | $0.00007 | $0.00089 |
Grade A, and why
gpio-baremetal scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GPIO (Bare-Metal)
Purpose
Configure and use GPIO without HAL: input/output modes, alternate function mapping, pull-up/down, speed/slew, and pin-change interrupts for LEDs, buttons, and peripheral pin mux.
When to Use
- Blink LED or read button before bringing up UART/SPI
- Mux pins to USART/SPI alternate functions
- EXTI line interrupts on pin edges
- Porting GPIO code between vendors
Workflow
1. STM32 GPIO pattern
/* Enable GPIOA clock */
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
/* PA5 output — MODER[11:10] = 01 */
GPIOA->MODER &= ~(3U << (5 * 2));
GPIOA->MODER |= (1U << (5 * 2));
/* Toggle via BSRR — atomic set/reset */
GPIOA->BSRR = (1U << 5); /* set */
GPIOA->BSRR = (1U << (5+16)); /* reset */
Alternate function (e.g., USART2 TX on PA2):
GPIOA->MODER &= ~(3U << (2*2));
GPIOA->MODER |= (2U << (2*2)); /* AF mode */
GPIOA->AFR[0] &= ~(0xFU << (2*4));
GPIOA->AFR[0] |= (7U << (2*4)); /* AF7 = USART2 */
2. Input with pull-up
/* PC13 input, pull-up */
GPIOC->MODER &= ~(3U << (13*2)); /* input mode 00 */
GPIOC->PUPDR &= ~(3U << (13*2));
GPIOC->PUPDR |= (1U << (13*2)); /* pull-up */
int pressed = !(GPIOC->IDR & (1U << 13)); /* active low */
3. EXTI interrupt (STM32)
/* SYSCFG: map EXTI13 to PC13 */
SYSCFG->EXTICR[3] = (SYSCFG->EXTICR[3] & ~0xFU) | 0x2; /* port C */
EXTI->IMR |= (1U << 13);
EXTI->FTSR |= (1U << 13); /* falling edge */
NVIC_EnableIRQ(EXTI15_10_IRQn);
ISR: check EXTI->PR, clear with write-1.
4. nRF52 / ESP32 notes
| Platform | Pattern |
|---|---|
| nRF52 | NRF_P0->PIN_CNF[n] — direction, pull, drive |
| ESP32 | GPIO.out_w1ts, GPIO.enable; IO_MUX for function |
Always enable peripheral clock / power domain before pin config.
5. Agent usage
/gpio-baremetal Configure PA2 as USART2 TX alternate function on STM32F4
Common Problems
| Symptom | Cause | Fix |
|---|---|---|
| Pin stuck | Wrong MODER / not AF | Re-read RM pin table |
| EXTI storm | No debounce / floating input | Enable pull; debounce in software |
| AF mismatch | Wrong AFR nibble | Pin-specific AF table in RM |
| No toggle visible | Wrong port bit / LED active low | Check schematic |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 96 lines · 66 tokens per session scan A bde62171e645
gpio-baremetal is a skill published in the GitHub repository mohitmishra786/low-level-dev-skills (202 stars, last pushed 2mo ago), licensed MIT. It adds 66 tokens to every session and 893 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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