arm-cortex-microcontrollers

<!-- BSV Скил : arm-cortex-microcontrollers TL;DR : Разработка прошивок для ARM Cortex-M: периферия, прерывания, RTOS, низкое потребление Вызов : /arm-cortex-microcontrollers, arm cortex, microcontroller, встроенное ПО НЕ для : высокоуровневого Linux-кода, веб-сервисов, облачных архитектур --> # ARM Cortex-M Microcontroller Development Expert firmware development for ARM Cortex-M series (M0, M0+, M3, M4, M7, M33, M55). ## When to Use This Skill - Configuring peripherals (GPIO, UART, SPI, I2C, ADC, DMA, timers) - Writing interrupt service routines and NVIC configuration - Integrating RTOS (FreeRTOS, Zephyr, RTX) - Optimizing for low-power operation (sleep modes, clock gating) - Debugging hard faults and memory corruption - Linker script authoring and memory map planning - Setting up toolchains (GCC ARM, LLVM, Keil, IAR) - Writing portable HAL abstraction layers ## Core Capabilities ### 1. Peripheral Configuration **GPIO** ```c // STM32 HAL example — configure PA5 as push-pull output GPIO_InitTypeDef GPIO_InitStruct = {0}; __HAL_RCC_GPIOA_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_5; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); ``` **UART DMA transfer (non-blocking)** ```c HAL_UART_Transmit_DMA(&huart2, tx_buf, len); // Completion fires HAL_UART_TxCpltCallback ``` ### 2. Interrupt Handling - Always declare ISRs `void __attribute__((interrup...