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Yigitcakirdogan/README.md

Yiğit Çakırdoğan — Embedded Systems & Functional Safety Engineer

Interactive Portfolio & Live Simulators LinkedIn Safety AUTOSAR

Executive Summary

I design and implement safety-critical, deterministic embedded software for automotive ECUs, industrial controllers, and connected telemetry nodes. My engineering methodology combines AUTOSAR Classic layered architecture, ISO 26262 (ASIL-B/D) functional safety mechanisms, MISRA C:2012 compliance, zero-copy DMA peripheral pipelines, and automated fault-injection unit testing.

Interactive Live Simulators: Try the live browser-based AUTOSAR ASIL-D 1oo2D Pedal Plausibility & E2E CRC-8 Simulator and STM32 Circular DMA SPSC Ring Buffer Visualizer at yigitcakirdogan.github.io.

  • Automotive & Functional Safety (ISO 26262 / AUTOSAR / MISRA C):
    • AUTOSAR Classic R4.4: Full layered design across ASW (Application SWCs), RTE, BSW Services (Dem counter-based debouncing, WdgM logical checkpoint graphs, E2E Profile 1 SAE J1850 CRC-8 protection), ECUAL (IoHwAb), and MCAL (Adc, Dio).
    • ISO 26262 ASIL-D Safety Mechanisms: 1oo2D dual-channel sensor plausibility voting, non-destructive windowed March-C- SRAM self-tests, redundant inverse variable storage (SEU protection), affine prime-signature Control Flow Monitoring (CFM), and Flash CRC-32 verification.
  • Bare-Metal & CMSIS Firmware: Direct register-level peripheral bring-up (RCC, GPIO, DMA, USART, SPI, I2C, TIM/PWM, ADC, IWDG), custom GNU LD linker scripts (CCM-RAM), startup vector tables, and HardFault stack frame diagnostics on STM32 (ARM Cortex-M4F/M7).
  • Real-Time Operating Systems (FreeRTOS): Rate-monotonic task partitioning, static memory allocation (xTaskCreateStatic), lock-free ISR-to-task synchronization, and multi-task hardware watchdog supervision.

Reference Safety & Firmware Architecture

flowchart LR
    subgraph HW["Hardware & Peripherals (STM32 / Automotive MCU)"]
        ADC["Dual-Slope ADC + DMA"]
        UART["USART + DMA + IDLE ISR"]
        CAN["bxCAN / ISO 11898"]
        SRAM["SRAM / Flash Memory"]
    end

    subgraph BSW_HAL["AUTOSAR BSW, Zero-Copy HAL & ISO 26262 Safety"]
        IOHWAB["IoHwAb & CMSIS Drivers"]
        E2E["AUTOSAR E2E P01 (CRC-8 + Alive)"]
        DEM_WDGM["Dem Debouncer & WdgM Checkpoint"]
        MARCH["March-C- RAM & SafeVar Inverse"]
    end

    subgraph APP["ASIL-D Application & Deterministic RTOS Layer"]
        VOTER["1oo2D Pedal Plausibility Voter SWC"]
        GW["CAN 2.0B <-> Modbus RTU Gateway"]
        CLI["Zero-Heap Diagnostic CLI"]
        FSM["Kalman & Offline Telemetry FSM"]
    end

    ADC --> IOHWAB --> VOTER
    VOTER --> DEM_WDGM & E2E
    UART --> IOHWAB --> CLI
    CAN --> IOHWAB --> GW
    SRAM --> MARCH --> VOTER & GW
Loading

Flagship Engineering Repositories & Open-Source Releases

Repository Architecture & Technical Highlights Release CI Status
autosar-classic-bsw-rte-pedal-voter AUTOSAR Classic ASIL-D 1oo2D Pedal Voter & E2E Stack
Complete MCAL -> IoHwAb -> Dem / WdgM / E2E P01 -> RTE -> ASW stack with dual-slope ratiometric sensor scaling, counter debouncing, Brake Override (BOS), and SAE J1850 CRC-8 protection.		 Release CI
iso26262-misra-c-safety-library ISO 26262-5/6 ASIL-D Software Safety Mechanisms in MISRA C:2012
Transparent windowed March-C- SRAM test, redundant inverse variables (SafeVar_u32_t), prime-signature Control Flow Monitor (CFM), ROM CRC-32 verifier, and stack canary guards.		 Release CI
stm32-dma-ringbuffer-uart-cli Zero-Copy UART DMA + Lock-Free SPSC Ring Buffer & CLI
Uses DMA1 Circular Mode + USART_SR_IDLE interrupt for variable-length packet reception with near-zero CPU overhead, paired with a static-memory diagnostic shell.		 Release CI
freertos-canbus-modbus-gateway FreeRTOS CAN 2.0B to Modbus RTU Industrial Gateway
Bridges automotive/industrial CAN frames into RS-485 Modbus Holding/Input registers (FC03, FC04, FC06, FC10) with table-driven CRC-16 and task-level watchdog supervision.		 Release CI
stm32f4-baremetal-hal-drivers Register-Level STM32F407 Drivers & Custom Linker Script
Pure CMSIS peripheral drivers (GPIO, SPI, I2C with 9-clock bus lockup recovery, IWDG), Reset_Handler startup in C, and CCM-RAM linker script—zero vendor HAL bloat.		 Release CI
esp32-industrial-iot-telemetry-node Fault-Tolerant Industrial IoT Edge Node
Deterministic connection FSM with exponential backoff, 1D Kalman + Median-of-5 sensor filtering, CRC32 binary/JSON telemetry codec, and offline store-and-forward ring buffering.		 Release CI
yay-kutle-sonum-sistemi Discrete-Time Control & Mass-Spring-Damper Simulation
Finite-difference discretization of $m\ddot{x} + c\dot{x} + kx = F(t)$ paired with an anti-windup, derivative-on-measurement Embedded C PID controller and Python step-response analysis.		 Control Pass

Technical Stack & Standards

Domain Technologies & Standards
Safety & Automotive ISO 26262 (ASIL-B / ASIL-D, HARA, FMEDA, 1oo2D, E2E), AUTOSAR Classic R4.4 (ASW, RTE, BSW, Dem, WdgM, IoHwAb, MCAL), MISRA C:2012 / C:2023, IEC 61508
Languages & Low-Level C (C99 / C11 Strict Subset), C++ (C++17 Embedded), Python 3, ARM Thumb-2 Assembly, GNU LD Linker Scripts
Microcontrollers & SoCs STM32F4 / STM32H7 (ARM Cortex-M4F/M7), Automotive Cortex-M / TriCore Concepts, ESP32 / ESP32-S3
RTOS & Concurrency FreeRTOS (Static Allocation, Rate Monotonic Scheduling, Queues, Mutexes), Lock-Free SPSC Ring Buffers, Circular DMA
Communication Protocols CAN 2.0A/B (ISO 11898), AUTOSAR E2E Profile 1, Modbus RTU (RS-485), SPI, I2C, UART, MQTT / TLS
Build, Test & Quality CMake, GNU Arm Embedded Toolchain (arm-none-eabi-gcc), CTest Fault-Injection Testing, GitHub Actions CI/CD, GDB / OpenOCD

Popular repositories Loading

  1. stm32-dma-ringbuffer-uart-cli stm32-dma-ringbuffer-uart-cli Public

    Zero-copy STM32 UART DMA driver with lock-free SPSC ring buffer, IDLE line detection, and deterministic command-line shell (CLI) for ARM Cortex-M4.

    C 1

  2. freertos-canbus-modbus-gateway freertos-canbus-modbus-gateway Public

    Deterministic FreeRTOS industrial protocol gateway bridging CAN 2.0B (ISO 11898) and Modbus RTU (RS-485) with hardware watchdog supervision.

    C 1

  3. stm32f4-baremetal-hal-drivers stm32f4-baremetal-hal-drivers Public

    Register-level bare-metal peripheral drivers (GPIO, SPI, I2C with 9-clock bus recovery, IWDG), C startup vector table, and custom linker script for STM32F407.

    C 1

  4. esp32-industrial-iot-telemetry-node esp32-industrial-iot-telemetry-node Public

    Fault-tolerant ESP32 industrial sensor telemetry node featuring deterministic FSM, 1D Kalman & Median-5 filtering, and CRC32 offline flash buffering.

    C 1

  5. autosar-classic-bsw-rte-pedal-voter autosar-classic-bsw-rte-pedal-voter Public

    AUTOSAR Classic R4.4 layered architecture (MCAL/IoHwAb/Dem/WdgM/E2E P01/RTE/ASW) for an ISO 26262 ASIL-D 1oo2D redundant accelerator pedal voter in MISRA C:2012.

    C 1

  6. iso26262-misra-c-safety-library iso26262-misra-c-safety-library Public

    ISO 26262-5/6 ASIL-D & IEC 61508 software safety mechanisms in MISRA C:2012: transparent March-C- SRAM test, inverse variables, control flow monitor, and ROM CRC32.

    C 1