| auxiliary_bus |
Linux kernel bus type (since 5.11) designed for a single parent device to spawn children on multiple subsystems. Replaces classic MFD platform_device wiring. |
| BOOTSEL |
The RP2350's ROM-resident USB mass-storage bootloader, activated by pulling a dedicated pin low at power-on. Used by RPBridge for OTA. |
| can2040 |
Kevin O'Connor's open-source software CAN 2.0B controller that runs on RP2040/RP2350 PIO. The RPBridge firmware vendors it as a git submodule. |
| capability map |
CBOR-encoded description of what an RPBridge firmware build can do. Queried by the host at bind time. See protocol/capabilities.md. |
| cdev v2 |
GPIO character-device ABI v2, stable since Linux 5.10. The only GPIO userspace ABI RPBridge supports (sysfs-GPIO is deprecated). |
| CDC-ACM |
USB Communications Device Class, Abstract Control Model. Used for the three virtual serial ports RPBridge exposes. |
| CRC-32C |
Cyclic redundancy check using the Castagnoli polynomial 0x1EDC6F41. Used on every RPBP frame. |
| DKMS |
Dynamic Kernel Module Support — a Debian-originated framework that rebuilds out-of-tree modules on every kernel upgrade. |
| gs_usb |
Geschwister-Schneider USB / candleLight USB-to-CAN protocol. Standard on Linux (drivers/net/can/usb/gs_usb.c) and supported by every major CAN tool. |
| IAD |
USB Interface Association Descriptor — groups multi-interface functions (e.g. CDC-ACM's control + data interfaces) so host OSes load the right driver. |
| IIO |
Linux Industrial I/O subsystem — canonical home for ADCs, DACs, light/temp sensors. RPBridge's ADC lives here. |
| MFD |
Multi-Function Device — Linux kernel pattern for single hardware exposing multiple logical subsystems. RPBridge uses the modern auxiliary_bus variant, not the legacy MFD+platform_device pair. |
| minisign |
Ed25519-based file signing tool, used for UF2 artefact signing in releases. |
| nusb |
Pure-Rust USB library, default transport for the RPBridge userspace client. |
| PIO |
RP2350's Programmable I/O state machines — tiny, fast, user-programmable co-processors. 12 total, grouped into three PIO blocks of four SMs each. |
| RPBP |
RPBridge Protocol — our wire format over the USB vendor bulk pipe. Current version: RPBP v1. |
| SPSC |
Single-producer, single-consumer — describes the lock-free ring buffers used between the two Cortex-M33 cores. |
| TinyUSB |
Embedded USB stack used by the firmware. Bundled with pico-sdk. |
| UF2 |
USB Flashing Format — Microsoft-originated archive format accepted by the RP2350 ROM mass-storage bootloader. |