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creyes2001/README.md

Cristopher Reyes

I'm a communications and electronics engineer working on automotive-style embedded projects, applying C and learning AUTOSAR and FreeRTOS.

Currently working in the automation industry at Alimentos Sello Rojo.

I'm drawn to motorsport — I'm fascinated by how an F1 car's onboard systems capture and process sensor data in real time, and by the whole electronic system of the car: powertrain, battery management, and control systems. That same curiosity extends to how systems like Mars rovers acquire and transmit data from remote, extreme environments.

Skills

Languages: C

Microcontrollers: 8-bit (PIC18F4550), 32-bit ARM Cortex-M (STM32F446RE, STM32G431RB)

RTOS: FreeRTOS (tasks, task notifications, scheduling)

Protocols: UART, CAN, I2C (academic)

Tools: GCC/arm-none-eabi-gcc, Makefile, GDB, CMSIS, Git

Debugging: Oscilloscope, multimeter, UART-based debugging

Other: Driver development, register-level programming, reading datasheets and reference manuals

Currently learning: AUTOSAR

Experience

FOC Motor Control (AUTOSAR-Inspired)

  • Bare-metal sensored FOC motor control for a BLDC/PMSM motor, built on an AUTOSAR-inspired layered architecture
  • Hardware: STM32G431RB (NUCLEO-G431RB), STSPIN830 motor driver, AS5600 magnetic encoder, GBM2804H-100T gimbal motor
  • Mcu and Port modules complete and tested — clock configuration (150 MHz SYSCLK, verified via MCO), input/output pin configuration
  • ADC driver in progress

FreeRTOS LED Blink via UART Commands — STM32F446RE

  • Two FreeRTOS tasks — UART command handling and LED blink control — synchronized via xTaskNotify
  • UART driver runs in both bare-metal and FreeRTOS contexts; debugged and fixed a baud rate bug (corrected formula and clock source)
  • All HAL drivers (GPIO, UART) written from scratch using CMSIS
  • FreeRTOS integrated as a git submodule, built via Makefile
  • No IDE — build, flash, and debug (GDB) entirely from the command line

Digital Clock — PIC18F4550

  • Wrote all drivers from scratch in C
  • Cooperative scheduler with 1ms tick (Timer 2)
  • Interrupt-driven design: system tick, UART communication with ring buffers
  • Debugged via multimeter and UART prints (external printf implementation)
  • Built and flashed from the command line via Makefile

Popular repositories Loading

  1. pic18-gpio-hal pic18-gpio-hal Public

    C

  2. pic18-button-driver pic18-button-driver Public

    C

  3. Led-task-scheduler Led-task-scheduler Public

    Assembly

  4. embedded-event-scheduler embedded-event-scheduler Public

    Assembly

  5. dio-module dio-module Public

    Assembly

  6. automotive-button-driver automotive-button-driver Public

    Assembly