FPiGA Audio Hat v1
Overview
FPiGA Audio Hat 1: A Versatile DSP Platform for Audio Innovation
The FPiGA Audio Hat 1 delivers a flexible and powerful digital signal processing (DSP) platform tailored for a wide range of audio applications — including synthesizers, guitar pedals, production effects, FPGA-based board development, retro gaming audio emulation, high-fidelity sound cards, and professional recording interfaces.
At its core, the Audio Hat pairs a Raspberry Pi with a Gowin FPGA and an Analog Devices SSM2603 audio codec, enabling a robust and configurable signal chain. This combination offers developers and audio enthusiasts the tools to build sophisticated, low-latency audio solutions.
Whether you're prototyping cutting-edge audio gear or experimenting with real-time audio synthesis, the FPiGA Audio Hat 1 offers the performance and flexibility to bring your ideas to life.
Supported Features
- * Multiple Audio Pathways offering Real time, single sample latency processing via FPGA Module
- * MIDI Input/Output via both USB and hardware MIDI interfaces through 3.5mm connectors
- * Flashing FPGA bitfile from IO Pins using OpenFPGALoader
- * SSM2603 Hi-Fi Audio Codec w/ programmable gain amplifiers and up to 96kSample rate
- * Ability to generate I2S clocking from ADC+Crystal
- * Audio Line Input, Microphone input, Line Output, and Headphones Output
- * SSM2603+FPGA combined I2C/Alsa Kernel Driver + Userspace C/C++ API Library
- * FPGA control Via I2C interface and Userspace Driver
- * Expanded 40 Pin header as well as 8 pin breakout from FPGA IO (To support expansion via hat stacking)
- * Custom (tuned) Pi OS Image for Audio Use w/ supporting software/drivers for hat board
- * FPGA reference design for HDL developers
Signal Path Options
- * Pi I2S Out -> FPGA -> Codec I2S DAC & Codec ADC Input -> FPGA -> Pi I2S Input
- * Codec ADC Input -> FPGA -> Codec I2S DAC
- * Codec ADC Input -> FPGA Input -> Pi I2S Input & FPGA generated output -> Codec I2S DAC
- * FPGA generated sound -> Pi I2S Input & Pi I2s output -> FPGA -> Codec I2S DAC
Driver Support
- * Raspberry Pi OS Kernel Driver
- * Raspberry Pi Circle Bare Metal Driver
FPGA Info
- * Sipeed Tang Primer 25K Module utilizing Gowin GW5A-LV25MG121 FPGA
- * Number of LUTS - 23040
- * Registers/FF - 23040
- * SRAM 180Kbits
- * BRAM 1008Kbits
- * DSP Multipliers - 28
- * PLLs - 6
- * Flash Storage - 64Mbits
Dataflow Diagram
Core Design
FPiGA Audio Hat 1 Core Design
