LPC4088 Embedded Firmware System

Bare-metal embedded firmware developed for the NXP LPC4088 microcontroller. This project demonstrates low-level hardware control, deterministic real-time behavior, and multi-peripheral integration.

Bare-Metal Firmware Architecture

Programmed the LPC4088 using ARM assembly and C++ at the register level.
No RTOS — firmware executes deterministically using interrupts and polling.
Direct control of GPIO, timers, UART, and I2C peripherals.
Designed a structured main loop with interrupt-driven events.
Emphasis on predictability, timing, and hardware awareness.

I2C Peripheral Integration

The firmware integrates multiple I2C devices on a shared bus, coordinated through low-level driver logic and a simple user-interface system.

RTC: DS1337 real-time clock with alarm support.
Temperature Sensor: DS1631 digital temperature sensor.
LCD: 4×20 character LCD via PCF8574T I/O expander.
Input: Matrix keypad for menu navigation and control.
Event-driven updates using timer interrupts and keypad input.

System Features

Real-time clock display and alarm handling.
Temperature monitoring with periodic updates.
Menu-driven UI using keypad + LCD.
Interrupt-driven timing using hardware timers.
Clean separation between drivers and application logic.

Tools Used

MCU: NXP LPC4088 (ARM Cortex-M4)
Languages: ARM Assembly, C++
Peripherals: GPIO, UART, I2C, Timers, Interrupts
IDE: Keil µVision 5
Debug: JTAG / Serial Debugging

Purpose

Demonstrate a strong understanding of low-level embedded systems by building a complete, bare-metal firmware application that interfaces directly with hardware and behaves deterministically.

Results

Fully functional multi-device I2C system.
Stable UI with predictable timing.
Demonstrated register-level hardware control.
Reusable firmware structure for future projects.

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