Coimbatore, India • LinkedIn • Email • Portfolio

Senior Embedded Systems Engineer with 6.5+ years of production experience delivering robust, safety-critical firmware across automotive, industrial automation, and edge telemetry domains.

Specialized in register-level Embedded C (C99), ARM Cortex-M4 (STM32F446RE @ 180 MHz), Automotive In-Vehicle Networking (CAN, ISO 14229-1 UDS, ISO 15765-2 DoCAN), Edge DSP / Signal Processing, Secure In-Application Programming (IAP) Bootloaders, and Python-based automated test frameworks (pytest). Strong foundation in hardware-software co-design, MISRA-C compliance, FreeRTOS multi-threading, and Linux kernel drivers.

• Architecture & Firmwares: Bare-metal register drivers, ISR architecture, hardware DMA ping-pong buffering, FSM engines, non-blocking timers, circular ring buffers.
• Automotive Protocols & Standards: ISO 14229-1 (Unified Diagnostic Services), ISO 15765-2 (DoCAN), CAN 2.0B / CAN-FD, ISO 10816-3 (Condition Monitoring), Seed-Key Security Access algorithms.
• Test Automation & Quality: Automated hardware-in-the-loop (HIL) test suites, Pytest diagnostic test automation, Unity C unit testing, GitHub Actions CI/CD workflows, MISRA-C static safety principles.
• Hardware & Lab Equipment: Digital Storage Oscilloscopes (DSO), Saleae Logic Analyzers, CAN transceivers, ST-LINK V2/V3 debugging, Multimeter, Schematic Review (KiCad).

Distributed Dual-MCU Industrial IoT Edge Controller & Gateway (STM32F446RE + ESP32-S3 FreeRTOS)

• Architectural Partitioning: Real-time deterministic sensor acquisition and actuator safety on ARM Cortex-M4 (STM32F446RE @ 180 MHz), offloading wireless BLE 5.0 diagnostics and MQTT telemetry to dual-core ESP32-S3.
• Deterministic DMA Protocol: Circular DMA UART with hardware IDLE line interrupt, fast 256-entry CRC-16-CCITT table verification, and compile-time struct static assertions.
• Fail-Safe Actuation & E-Stop: Sub-millisecond physical shutdown directly cutting TIM1->BDTR Main Output Enable (MOE), clearing PWM duty to 0%, and releasing relay coils.
• Verification & CI/CD: 7/7 Native C99 unit tests + 6/6 Python protocol stress tests running in automated GitHub Actions CI.

Production ISO 14229-1 (UDS) Server & ISO 15765-2 (DoCAN) Transport Layer on STM32F446RE (ARM Cortex-M4 @ 180 MHz)

• Full ISO 15765-2 DoCAN network layer handling Single Frame, First Frame, Flow Control (with BS and STmin), and Consecutive Frames with strict timeout monitoring (N_Bs, N_Cr).
• Complete ISO 14229-1 UDS diagnostic server supporting services 0x10, 0x11, 0x14, 0x19, 0x22, 0x27 (with 3-attempt lockout), 0x2E, 0x31, and 0x3E.
• Hardware bxCAN peripheral driver configured at 500 kbps with dual 32-bit hardware identifier filtering.
• Verification: 15/15 Unity C unit tests passing + 9/9 Python diagnostic client validation tests.

Real-Time 1024-Point Real FFT & Ping-Pong DMA Edge DSP Engine on STM32F446RE FPU

• Continuous 50 kHz accelerometer sampling triggered via TIM2 TRGO into ADC1 with zero CPU overhead using DMA2 Stream 0 double-buffering.
• 1024-point Real FFT decomposition on ARM Cortex-M4 hardware FPU executing in under 1.1 ms (5.3% CPU budget).
• Raised-cosine Hanning windowing, parabolic sub-bin peak interpolation, Total Harmonic Distortion (THD %) computation, and automated ISO 10816-3 machinery vibration health evaluation.
• Verification: 7/7 Unity C unit tests + Python real-time spectral waterfall viewer tool.

Brick-Proof Dual-Slot In-Application Programming (IAP) Bootloader on STM32F446RE (512 KB Flash)

• Asymmetric NOR Flash partitioning (Slot A: 192 KB, Slot B: 256 KB) strictly aligned to physical erase sector boundaries.
• Hardware CRC-32 accelerator (0x04C11DB7) over entire image payload with structured 40-byte image_header_t.
• Main Stack Pointer (MSP) sanity checking within physical SRAM bounds (0x20000000–0x20020000), vector table relocation (SCB->VTOR), and execution handover.
• Watchdog probation window (SLOT_STATE_TESTING) with automatic rollback to alternate slot if firmware crashes repeatedly.
• Verification: 10/10 Unity C unit tests + Python IAP packager and UART flasher utility.

Automotive EV Battery Management System (BMS) Diagnostic Test Automation in Python

• Production Pytest test harness validating cell balancing, overvoltage/undervoltage thresholds, thermal runaway alerts, and UDS diagnostic routines.
• Automated CAN bus telemetry decoding, log assertions, and test report generation.

Linux Kernel Character Device Driver with Concurrency Control & Ring Buffering

• Kernel character driver with non-blocking I/O, wait queues, mutex concurrency protection, and ioctl telemetry control.

Real-Time Automotive Digital Instrument Cluster with High-Speed CAN Bus Ingestion

• High-performance instrument cluster displaying real-time speed, RPM, battery telemetry, and ISO warning telltales.

• ⭐ embedded-c-ring-buffer — Lock-free, thread-safe FIFO circular ring buffer in C99 for UART/SPI ISR-to-main communication.
• ⭐ embedded-fsm-engine — Table-driven Finite State Machine (FSM) framework with an Automatic Transfer Switch (ATS) industrial model.
• ⭐ embedded-software-timer — Deterministic software timer service with delta-tick queue management and sub-millisecond precision.
• ⭐ embedded-nvm-fault-logger — Anti-tearing wear-leveled NVM blackbox fault recorder in C99 with CRC-16-CCITT integrity.
• ⭐ smart-industrial-disinfection-controller — Industrial multi-phase ozone & UV-C sterilization system with Modbus RTU telemetry and safety interlocks.
• ⭐ stm32-can-telemetry-prototype — Automotive bxCAN 500 kbps telemetry acquisition, hardware acceptance filtering, and safety heartbeat monitor.
• ⭐ stm32-freertos-sensor-hub — Multi-tasking sensor acquisition and telemetry with FreeRTOS queues, mutexes, and watchdog supervision on STM32.
• ⭐ industrial-sensor-hal — Decoupled sensor driver library for MAX6675 (SPI), DS18B20 (1-Wire with CRC8), and NTC ADC LUT interpolation.
• ⭐ modbus-rtu-slave-c — Lightweight Modbus-RTU slave protocol stack with fast table CRC-16 for RS-485 industrial networks.

Target: Microchip PIC18 • Status: Commercial Product (Source Code Confidential)

• Industrial power automation controller for automated, fail-safe switching between mains grid and backup generator.
• Implemented multi-state generator & mains transfer logic with strict break-before-make relay interlocking.
• Configured calibrated ADC sampling for rapid undervoltage, overvoltage, and phase-imbalance detection with persistent EEPROM fault logging.

Target: PIC18 / STM32 • Status: Commercial Product (Source Code Confidential)

• Edge monitoring and logging system deployed across industrial weaving facilities collecting shift-wise metrics from 16 looms simultaneously.
• Built a power-fail-safe state snapshotting mechanism to EEPROM with RTC (DS3231) timestamping.

Target: PIC18F46K22 • Status: Commercial Product (Source Code Confidential)

• Precision cooling and compressor management controller for commercial refrigeration units.
• Interfaced analog NTC (calibrated LUT linearisation), 1-Wire (DS18B20), and SPI (MAX6675) with anti-short-cycle delay timers.