DJ Pete Beat Sequencer
Embedded firmware for STM32 microcontrollers featuring I2C, DMA, DAC, SPI integration with Adafruit NeoTrellis RGB keypads for interactive music production.
Architecture
STM32 ARM Cortex-M4 microcontroller with multiple communication protocols (I2C, SPI) for RGB keypad integration. DMA-driven audio processing for real-time audio sample streaming to DAC.
User Input → STM32 → I2C/SPI → RGB Keypad → DMA → DAC → Audio OutputKey Features
Multi-Protocol Communication
Implemented I2C and SPI communication protocols for integration with Adafruit NeoTrellis RGB keypads and external peripherals.
DMA-Driven Audio
Leveraged Direct Memory Access for real-time audio sample streaming to DAC, reducing CPU bottlenecks in audio processing pipeline.
Real-time RGB Control
LED matrix management with per-key RGB control, creating visual feedback system synchronized with audio patterns.
Low-Level Optimization
Hand-optimized ARM assembly routines for critical audio paths, achieving deterministic timing for music applications.
Technical Details
STM32 Embedded System
ARM Cortex-M4 microcontroller running at 168MHz with 512KB flash and 192KB SRAM. 8x8 RGB matrix for visual feedback.
Implemented I2C Master/Slave, SPI Full Duplex, DMA Circular Mode, and GPIO Interrupt handling.
Real-time Audio Processing
DMA-driven audio pipeline for deterministic timing. Hand-optimized ARM assembly for critical paths.
Impact & Results
Showcased embedded systems proficiency through creative music technology, bridging hardware and artistic expression
Key Achievements
Implemented embedded systems with multiple communication protocols
Created interactive RGB keypad interface for music production
Presented at Purdue Spark Challenge showcasing technical innovation
Demonstrated proficiency in low-level hardware programming and real-time systems
Technical Innovation
- • Embedded systems architecture design
- • Real-time audio processing on resource-constrained hardware
- • Multi-protocol communication stack implementation
- • Precise timing for music applications
- • Low-level embedded programming proficiency
- • Real-time systems concepts in practical context