RISC-V LED Matrix Sprite Control

This repository contains a RISC-V 32-bit Assembly project developed for the course CIIC 4082 – Computer Architecture II (Fall 2025) at the University of Puerto Rico, Mayagüez. The project focuses on graphics rendering and user input handling using memory-mapped I/O, implemented and tested using the Ripes simulator.

Project Overview

RISC-V LED Matrix Sprite Control is an educational project that renders a custom emoji sprite on a 25×35 LED Matrix and allows the user to move it interactively using a D-Pad input device.

The project reinforces fundamental computer architecture concepts by combining:

• Low-level RISC-V assembly programming
• Direct hardware control via memory-mapped I/O
• Input handling and boundary checking
• Structured program flow using subroutines

Features

• Custom Emoji Rendering

  • Emoji resolution: 15×16 pixels
  • Pixel data stored using .word directives
  • Colors encoded as 0x00RRGGBB

• D-Pad Controlled Movement

  • Real-time movement using Ripes D-Pad
  • Boundary collision detection
  • Prevents movement outside the LED Matrix limits

• Low-Level Hardware Interaction

  • Direct manipulation of memory-mapped LED Matrix
  • Input polling via memory-mapped registers

Emoji Representation

The emoji sprite is represented as a 15×16 pixel bitmap.
Each row of the sprite is stored as a .word containing the pixel color data in hexadecimal format.

This design allows the sprite to be efficiently rendered and repositioned within the 25×35 LED Matrix provided by Ripes.

Tools & Technologies

• RISC-V 32-bit Assembly
• Ripes Simulator
  • 32-bit RISC-V pipeline visualization
  • LED Matrix peripheral
  • D-Pad input device

Learning Objectives

This project was designed to reinforce:

• RISC-V instruction set usage and register management
• Memory-mapped I/O concepts
• Subroutine structure and control flow
• Practical application of CPU architecture theory
• Efficient handling of limited hardware resources

Requirements

• Ripes – RISC-V Architecture Simulator
• Basic understanding of RISC-V Assembly

License

This project is licensed under the MIT License.
See the LICENSE file for details.

Contact

If you have any questions or suggestions, feel free to reach out:

• GitHub: Neowizen