https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Wed, 17 Jun 2026 00:00:00 GMT https://www.youngju.dev/blog/architecture/2026-06-17-fingerscore-mcu-firmware-gesture-input.en https://www.youngju.dev/blog/architecture/2026-06-17-fingerscore-mcu-firmware-gesture-input.en This post covers the brain of the FingerScore BLE ring device for racket-sports score keeping: the MCU firmware. From the structure of init, main loop, interrupts, and low-power sleep, through detecting buttons and gestures with GPIO interrupts, debouncing, an IMU threshold state machine, and the flow from event to score increment, all illustrated with compilable C code examples. Wed, 17 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) fingerscorefirmwaremcuembeddedgesturelow-power https://www.youngju.dev/blog/architecture/2026-06-17-fingerscore-mcu-firmware-gesture-input.ja https://www.youngju.dev/blog/architecture/2026-06-17-fingerscore-mcu-firmware-gesture-input.ja ラケットスポーツのスコア記録用 BLE リングデバイス FingerScore の頭脳である MCU ファームウェアを扱います。初期化・メインループ・割り込み・低電力スリープの構造から、GPIO 割り込みによるボタンとジェスチャーの検出、デバウンス、IMU のしきい値ステートマシン、イベントからスコア加算までの流れを、コンパイル可能な C コード例とともに整理します。 Wed, 17 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) fingerscorefirmwaremcuembeddedgesturelow-power https://www.youngju.dev/blog/architecture/2026-06-17-fingerscore-mcu-firmware-gesture-input https://www.youngju.dev/blog/architecture/2026-06-17-fingerscore-mcu-firmware-gesture-input 라켓 스포츠 점수 기록용 BLE 링 디바이스의 두뇌, MCU 펌웨어를 다룹니다. 초기화·메인 루프·인터럽트·저전력 슬립의 구조부터 GPIO 인터럽트로 버튼과 제스처를 감지하는 법, 디바운싱, IMU 임계값 상태 머신, 이벤트에서 점수 증가까지의 흐름을 컴파일 가능한 C 코드 예제와 함께 정리합니다. Wed, 17 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) fingerscorefirmwaremcuembeddedgesturelow-power