Embedded Systems

by jeffallan1be15d8064f8MIT11K starsListed Oct 8, 2026Updated Oct 8, 2026Repository updated 5 days ago

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.

Instructions onlySoftware Development

AI-generated overview

Guides firmware development for microcontrollers, RTOS applications, and power optimization.

What it does: This skill provides embedded systems engineering guidance for writing firmware on microcontrollers, implementing RTOS applications, and optimizing power consumption. It covers constraint analysis, architecture design, driver implementation, validation, resource optimization, and testing. It produces hardware initialization code, driver and interrupt handler code, application code, and resource usage summaries. Reference files cover RTOS patterns, microcontroller programming, power optimization, communication protocols, and memory optimization.
When to use it: Use it when developing firmware for microcontrollers, implementing RTOS applications, or optimizing power consumption. It is intended for work involving STM32, ESP32, FreeRTOS, bare-metal systems, real-time systems, peripheral configuration, interrupt handlers, DMA transfers, and timing debugging.
Requirements: No scripts are included; it is instructions only. The workflow references external tools such as a compiler with -Wall -Werror, static analysis tools like cppcheck, and hardware such as a logic analyzer or oscilloscope for timing validation.

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
Communication	`references/communication-protocols.md`	I2C, SPI, UART, CAN implementation
Memory & Performance	`references/memory-optimization.md`	Code size, RAM usage, flash management

Constraints

MUST DO

Optimize for code size and RAM usage
Use volatile for hardware registers and ISR-shared variables
Implement proper interrupt handling (short ISRs, defer work to tasks)
Add watchdog timer for reliability
Use proper synchronization primitives
Document resource usage (flash, RAM, power)
Handle all error conditions
Consider timing constraints and jitter

MUST NOT DO

Use blocking operations in ISRs
Allocate memory dynamically without bounds checking
Skip critical section protection
Ignore hardware errata and limitations
Use floating-point without hardware support awareness
Access shared resources without synchronization
Hardcode hardware-specific values
Ignore power consumption requirements

Code Templates

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

/* 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);    }}

/* 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);    }}

FreeRTOS Task Creation Skeleton

#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();}

#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();}

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

/* 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);}

/* 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);}

Output Templates

When implementing embedded features, provide:

Hardware initialization code (clocks, peripherals, GPIO)
Driver implementation (HAL layer, interrupt handlers)
Application code (RTOS tasks or main loop)
Resource usage summary (flash, RAM, power estimate)
Brief explanation of timing and optimization decisions

Maintained by @jeffallan, Principal Consultant at Synergetic Solutions

Documentation

Source and attribution

Source:jeffallan/claude-skillsinskills/embedded-systemsat commit1be15d8

License: MIT

Content belongs to its original authors. SourceWeft indexes it from a public repository.

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Embedded Systems

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

Source and attribution

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