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`rp2040-pac`

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Peripheral access API for the RP2040 dual-core system-on-chip (generated using svd2rust) - [![crates.io](https://img.shields.io/crates/v/rp2040-pac.svg)](https://crates.io/crates/rp2040-pac)

FreeFree tier
Type
Open Source
Visit Website GitHub (38 stars)

About `rp2040-pac`

rp2040-pac is a Peripheral Access Crate (PAC) for the RP2040 dual-core system-on-chip, automatically generated from the official SVD (System View Description) file using svd2rust. It provides low-level, register-level access to all peripherals of the RP2040 microcontroller (e.g., GPIO, UART, SPI, I2C, PIO, DMA). This crate is the foundational hardware abstraction layer for writing bare-metal Rust firmware on the Raspberry Pi Pico and other RP2040-based boards. It is part of the Rust embedded ecosystem and is listed in the awesome-embedded-rust collection.

Key Features

Register-level access to all RP2040 peripherals (GPIO, UART, SPI, I2C, PIO, DMA, clocks, etc.)
Auto-generated from official SVD file using svd2rust for accuracy
Memory-mapped I/O with generated read/write methods and bitfield enums
Supports both Cortex-M0+ cores and all on-chip peripherals
No runtime overhead – direct hardware manipulation
Designed for use in `no_std` embedded Rust projects

Pros & Cons

Pros
  • Provides exhaustive, type-safe register access generated from official hardware description
  • Allows full low-level control without abstraction overhead
  • Actively maintained and aligned with upstream RP2040 SVD releases
  • Part of the well-established Rust embedded ecosystem (awesome-embedded-rust)
  • Free and open source (MIT or Apache-2.0)
Cons
  • Requires `unsafe` Rust code for register accesses, increasing risk of memory-safety issues if misused
  • No high-level abstractions – akin to reading a datasheet directly
  • Steep learning curve for newcomers to embedded Rust or register-level programming
  • Not a standalone firmware framework; needs a HAL or BSP for practical application development

Best For

Developing bare-metal firmware for Raspberry Pi Pico and RP2040 boardsBuilding custom hardware abstraction layers (HALs) on top of the PACLow-level system programming, bootloaders, and real-time applicationsLearning embedded Rust and microcontroller register programmingPorting existing C/C++ RP2040 code to Rust

FAQ

What is a Peripheral Access Crate (PAC)?
A PAC provides low-level register definitions and access functions for a specific microcontroller, generated from its SVD file. It allows direct, memory-mapped I/O to hardware registers using safe Rust wrappers over unsafe operations.
How is rp2040-pac generated?
It is automatically generated from the official RP2040 SVD file using the svd2rust tool. This ensures the register layouts match the hardware specification exactly.
Can I use rp2040-pac directly to write firmware?
Yes, but it requires extensive use of unsafe code and manual register manipulation. Most developers prefer using a higher-level HAL (like rp2040-hal) built on top of this PAC.
Is this crate official from Raspberry Pi?
No, it is a community-maintained open-source crate listed on crates.io. It follows the official SVD but is not officially supported by Raspberry Pi.