Microcontroller Projects — TM4C1294

Embedded C · GPIO · UART · ADC · PWM · Interrupts

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Overview

This repository contains embedded C projects developed for the Texas Instruments TM4C1294NCPDT microcontroller (ARM Cortex-M4F) as part of the Microcontroller Lab course at HAW Hamburg. Each project demonstrates hands-on use of core MCU peripherals — ADC, PWM, UART, GPIO — with interrupt-driven design patterns.

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Repository Structure

microcontrollerProjects/
│
├── LED_Pendulum_UART_Display/          # Project 1 — UART-controlled LED pendulum display
├── LED_Dimmer_XY_Joystick/             # Project 2 — PWM LED dimmer via analog XY joystick
├── Digital_Multimeter_WeightedConversion/  # Project 3 — Digital voltmeter using weighted conversion
│
└── README.md

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Projects

Project 1 — LED Pendulum UART Display

Folder: LED_Pendulum_UART_Display/

Displays characters typed on a PC onto a swinging LED pendulum in real time via UART. The microcontroller receives ASCII characters, maps them to a bitmap font, and renders them column by column as the pendulum swings.

Feature	Detail
Communication	UART0 — PC to MCU character streaming
Display	10-character string rendered on LED pendulum (5×5 bitmap font)
Interrupt sources	UART RX interrupt + GPIO button interrupt
Display modes	Toggle between red-on-black and black-on-red via push button
Supported chars	A–Z, 0–9 (ASCII 0x41–0x5A)

Key files:

• main.c — main loop and peripheral configuration
• int_handler.c / .h — UART and GPIO interrupt handlers
• int_handler_invert.c — inverted display mode handler
• 5x5_font.h — bitmap character definitions
• tm4c1294ncpdt_startup_ccs.c — CCS startup file

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Project 2 — PWM LED Dimmer via Analog XY Joystick

Folder: LED_Dimmer_XY_Joystick/

Controls LED brightness using a 12-bit ADC reading from an analog XY joystick. PWM duty cycle (5%–95%) is adjusted based on joystick position, with a button to toggle between full and minimum brightness.

Feature	Detail
ADC	Internal 12-bit ADC (Sequence 0) reading joystick X-axis
PWM	1 kHz square wave via Timer2, duty cycle 5%–95%
Joystick behavior	Right → increase brightness · Left → decrease · Center → hold
Button behavior	Toggle full ↔ minimum brightness
Interrupt sources	Timer interrupt for PWM · GPIO for button

Key files:

• main.c — ADC polling, PWM control logic
• int_portM_handler.c / .h — GPIO port M interrupt handler

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Project 3 — Digital Voltmeter via Weighted Conversion

Folder: Digital_Multimeter_WeightedConversion/

Measures an external analog voltage using the Weighted Conversion Method with an external DAC and the TM4C1294 ADC. The result is displayed as a 4-digit BCD value (e.g. 12.34) on a BCD display.

Feature	Detail
Method	Weighted (successive approximation) conversion
Interface	External DAC + TM4C1294 ADC
Output	4-digit BCD display (integer + decimal parts)
LSB resolution	~0.0195 V
Build system	CMake (CLion / GCC toolchain)

Key files:

• main.c — conversion logic, BCD display output
• CMakeLists.txt — build configuration

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Hardware Platform

Property	Value
MCU	Texas Instruments TM4C1294NCPDT
Architecture	ARM Cortex-M4F @ 120 MHz
Flash / RAM	1 MB / 256 KB
Peripherals used	GPIO, ADC, PWM (Timer), UART0
IDE	TI Code Composer Studio (CCS) / CLion

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Getting Started

Prerequisites

• TI Code Composer Studio or CLion with GCC ARM toolchain
• TM4C1294 LaunchPad or compatible evaluation board
• TivaWare peripheral driver library

Build & Flash (CCS)

1. Import the project folder into Code Composer Studio
2. Select the correct target device: TM4C1294NCPDT
3. Build → Flash via JTAG/XDS110 debugger
4. Open a serial terminal (115200 baud) for UART projects

Build (CMake — Project 3)

cd Digital_Multimeter_WeightedConversion
mkdir build && cd build
cmake ..
make

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Author

Mainuddin Monsur Robin M.Sc. Information and Communication Engineering — HAW Hamburg