FPiGA Core: Crimson

Links

System Introduction

Overview

Introducing FPiGA: A Unified FPGA-to-Raspberry Pi Interface Standard

FPiGA was born from the need to establish a consistent, streamlined standard for interfacing FPGAs with Raspberry Pi–class platforms. Until now, no widely adopted methodology has existed, resulting in a fragmented landscape of incompatible and inconsistent implementations.

FPiGA addresses this gap with a “Keep It Simple, Stupid” (KISS) philosophy — aiming to reduce complexity while enhancing reliability. The project focuses on delivering a cohesive ecosystem that includes:

* Standardized hardware interfaces
* Reusable HDL IP libraries
* Unified device drivers
* Consistent hardware abstraction libraries

By defining clear and reliable standards, FPiGA simplifies development, encourages interoperability, and accelerates innovation across FPGA and Raspberry Pi integration projects.

Core Concepts Of Compliance

1. Maintain standard hardware interfacing as defined by the FPiGA System
2. Maintain standard kernel/bare metal drivers for interfacing
3. Maintain standard HDL IP Cores across various vendors
4. Maintain standard user space software libraries

Hardware Interfaces

Hardware interfaces can currently be separated into two standardized formats (CPU<->FPGA and FPGA Interfaces).
C2FPGA Interface (CPU to/from FPGA) - These interfaces provide communication and data transfer to/from CPUs and FPGAs.
FPGA Interface - These Interfaces proved communication and data transfer to/from FPGAs and other hardware devices.

FPiGA Core Lib

Software And Drivers

FPGA HDL

I2CHDR Standard

Hardware

Kernel Driver

Userspace Library

FPGA HDL Lib

I2SAudio

Hardware

Kernel Driver

Userspace Library

FPGA HDL Lib

DSP

Audio DSP

Debug Core

Overview

Kernel Driver

Userspace Application

Supported Devices/Interfaces

Supported CFPGA Interfaces

Supported FPGA Interfaces

FPGA 8 Pin
I2S

Planned CFPGA Interfaces

Planned FPGA Interfaces

SPI
SMI
PCIe
MIPI
USB

PMOD
SYGYZY
FMC

Supported ARM OS

Supported Bare Metal

Supported Driver Interfaces

Raspberry Pi OS ARM32 & ARM64

Raspberry Pi Circle

Supported SoC Devices

Planned OS/Bare Support

Planned SoC Device Support

Raspberry Pi
(2,3,4,5,CM4,CM5,Zero,Zero2W)

Debian ARM32 & ARM64
Ubuntu ARM32 & ARM64
Yocto ARM32 & ARM64
FreeRTOS
Zephyr
Raspberry Pi Pico C/C++
Raspberry Pi Pico Micropython
Debian x86
Ubuntu x86
Windows ARM32 & ARM64
Windows x86

Radxa Rock3, Rock5, RockCM3, RockCM5, Rock Zero3W, X2L, X4
Orange Pi

Supported FPGAVendors

Gowin