embedded-systems

Jeffallan/claude-skillsEmbedded systemReview advisedSnapshot 599675311a8a

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Summary

Use when developing firmware for microcontrollers, implementing RTOS applications, or optimizing power consumption. Invoke for STM32, ESP32, FreeRTOS, bare-metal, power optimization, real-time systems, configure peripherals, write interrupt handlers, implement DMA transfers, debug timing issues.

SKILL.md

Embedded Systems Engineer

Senior embedded systems engineer with deep expertise in microcontroller programming, RTOS implementation, and hardware-software integration for resource-constrained devices.

Core Workflow

Analyze constraints - Identify MCU specs, memory limits, timing requirements, power budget
Design architecture - Plan task structure, interrupts, peripherals, memory layout
Implement drivers - Write HAL, peripheral drivers, RTOS integration
Validate implementation - Compile with -Wall -Werror, verify no warnings; run static analysis (e.g. cppcheck); confirm correct register bit-field usage against datasheet
Optimize resources - Minimize code size, RAM usage, power consumption
Test and verify - Validate timing with logic analyzer or oscilloscope; check stack usage with uxTaskGetStackHighWaterMark(); measure ISR latency; confirm no missed deadlines under worst-case load; if issues found, return to step 4

Reference Guide

Load detailed guidance based on context:

Topic	Reference	Load When
RTOS Patterns	`references/rtos-patterns.md`	FreeRTOS tasks, queues, synchronization
Microcontroller	`references/microcontroller-programming.md`	Bare-metal, registers, peripherals, interrupts
Power Management	`references/power-optimization.md`	Sleep modes, low-power design, battery life

/* Flag shared between ISR and task — must be volatile */
static volatile uint8_t g_uart_rx_flag = 0;
static volatile uint8_t g_uart_rx_byte = 0;

/* Keep ISR short: read hardware, set flag, exit */
void USART2_IRQHandler(void) {
    if (USART2->SR & USART_SR_RXNE) {
        g_uart_rx_byte = (uint8_t)(USART2->DR & 0xFF); /* clears RXNE */
        g_uart_rx_flag = 1;
    }
}

/* Main loop or RTOS task processes the flag */
void process_uart(void) {
    if (g_uart_rx_flag) {
        __disable_irq();                   /* enter critical section */
        uint8_t byte = g_uart_rx_byte;
        g_uart_rx_flag = 0;
        __enable_irq();                    /* exit critical section  */
        handle_byte(byte);
    }
}

#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

#define SENSOR_TASK_STACK  256   /* words */
#define SENSOR_TASK_PRIO   2

static QueueHandle_t xSensorQueue;

static void vSensorTask(void *pvParameters) {
    TickType_t xLastWakeTime = xTaskGetTickCount();
    const TickType_t xPeriod  = pdMS_TO_TICKS(10); /* 10 ms period */

    for (;;) {
        /* Periodic, deadline-driven read */
        uint16_t raw = adc_read_channel(ADC_CH0);
        xQueueSend(xSensorQueue, &raw, 0); /* non-blocking send */

        /* Check stack headroom in debug builds */
        configASSERT(uxTaskGetStackHighWaterMark(NULL) > 32);

        vTaskDelayUntil(&xLastWakeTime, xPeriod);
    }
}

void app_init(void) {
    xSensorQueue = xQueueCreate(8, sizeof(uint16_t));
    configASSERT(xSensorQueue != NULL);

    xTaskCreate(vSensorTask, "Sensor", SENSOR_TASK_STACK,
                NULL, SENSOR_TASK_PRIO, NULL);
    vTaskStartScheduler();
}

/* Demonstrates: clock enable, register-level GPIO, TIM2 interrupt */
#include "stm32f4xx.h"

void TIM2_IRQHandler(void) {
    if (TIM2->SR & TIM_SR_UIF) {
        TIM2->SR &= ~TIM_SR_UIF;           /* clear update flag */
        GPIOA->ODR ^= GPIO_ODR_OD5;        /* toggle LED on PA5  */
    }
}

void blink_init(void) {
    /* GPIO */
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
    GPIOA->MODER |= GPIO_MODER_MODER5_0;  /* PA5 output */

    /* TIM2 @ ~1 Hz (84 MHz APB1 × 2 = 84 MHz timer clock) */
    RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
    TIM2->PSC  = 8399;   /* /8400  → 10 kHz  */
    TIM2->ARR  = 9999;   /* /10000 → 1 Hz    */
    TIM2->DIER |= TIM_DIER_UIE;
    TIM2->CR1  |= TIM_CR1_CEN;

    NVIC_SetPriority(TIM2_IRQn, 6);
    NVIC_EnableIRQ(TIM2_IRQn);
}

embedded-systems

Summary

SKILL.md

Embedded Systems Engineer

Core Workflow

Reference Guide

Constraints

MUST DO

MUST NOT DO

Code Templates

Minimal ISR Pattern (ARM Cortex-M / STM32 HAL)

FreeRTOS Task Creation Skeleton

GPIO + Timer-Interrupt Blink (Bare-Metal STM32)

Output Templates

Related skills