Overview
Silicon Labs RAIL (Radio Abstraction Interface Layer) provides an intuitive and easily-customizable radio interface that is designed to support proprietary or standards-based wireless protocols. RAIL allows customers to adopt the latest RF technology without sacrificing the previous development investment and future-proofs the code migration to future EFR32 ICs. The unified radio software API abstracts the significant number of hardware registers and complexity of the lower-level radio block, allowing customers to focus on their proprietary wireless application development instead of mastering device-specific details.?
RAIL Software Features and Benefits
| Features | Benefits | |
|---|---|---|
| Unified Radio API across SoCs | Application portability; Simple APIs for complex radio register level configurations | |
| Multi-Protocol and Multi-PHY Support | Develop innovative applications like Dynamic Multi-Protocol BLE + Proprietary | |
| Ready to use and customizable PHYs | Simplify & shorten the development process with dozens of validated PHYs | |
| Support for WM-BUS, SigFox and Wi-SUN | Develop standard-based stacks using Silicon Labs hardware | |
| Support for low power energy modes | Develop very low power battery operated applications |
RAIL SDK Specification Support
Sample Applications
?RAILtest
?Range Test
?Simple TRX
?Empty Example
?Duty Cycle
?Energy Mode
?Light and Switch
?Wireless M-bus Meter/Collector
Enablement
?Bootloader
?In-Field Upgrade
?Secure Boot
?Signed Upgrade Images
?Encrypted Upgrade Images
?RTOS
?Micrium
?Command Line Interface
Development Tools
?Simplicity Studio IDE
?Radio Configurator
?Network Analyzer
?Energy Profile
?Application Builder
?Hardware Configurator
Supported Toolchains
?IAR Embedded Workbench for ARM
?GCC (The GNU Compiler Collection)
Mobile Apps
?DMP BLE+RAIL Mobile App for iOS and Android
Downloads
Download and Install Simplicity Studio
Get up and running quickly with precompiled demos, application notes and examples. Use advanced tools including energy profiling and network analysis to optimize your wireless systems. Choose your software package below.
GitHub
Silicon Labs wireless IoT SDKs and code examples are also available for download on GitHub.
VS Code IDE Support
In addition to the Simplicity Studio IDE, we also support VS Code that can be used in companion with all of our unique development tools.
Related Software
Simplicity Studio
Get up and running quickly with precompiled demos, application notes and examples. Use advanced tools including energy profiling and network analysis to optimize your MCU and wireless systems.
Tech Docs
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Simplicity SDK
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Gecko SDK
Simplicity SDK Release Notes (2025.6.1)
Latest Release - Q2/2025 ?(July 2025)
?
View Latest Versions of All SiSDK Release Notes Here
RAIL SDK Release Notes
| Release | Date | Release Notes |
|---|---|---|
| 2025 | Latest Version | View Latest Version? |
| 2025/08 | Version 2.18.3.0? |
|
| 2025/04 | Version 2.18.2.0? |
|
| 2025/02 | Version 2.18.1.0? |
|
| ?2024 | 2024/12 | Version 2.18.0.0? |
Gecko SDK Release Notes (4.4.6.0)
Latest Release - Q1/2025 ?(February 2025)
Proprietary Flex Version 3.7.6.0
Rail Apps and Libraries
- ?Connect OFDM support for some applications
- EFR32xG28 Proprietary 2.4 GHz 15.4 Standard PHY support
- Added hardware support: MG24 QFN40, EFRBG22-E, EFR32xG28 Explorer Kit
Connect Apps and Stack
- SUN-FSK and SUN-OFDM support
- Long message reception and transmission
| Release | Date | Release Notes |
|---|---|---|
| 2025 | 2025/02 | Version 3.7.6.0? |
| 2025/01 | Version 3.5.7.0? |
|
| 2024? | 2024/10 | Version 3.7.5.0? |
| 2024/08 | Version 3.7.4.0? |
|
| 2024/07 | Version 3.5.6.0? |
|
| 2024/05 | Version 3.7.3.0? |
|
| 2024/04 | Version 3.7.2.0? |
|
| 2024/03 | Version 3.6.3.0? |
|
| 2024/02 | Version 3.7.1.0? |
|
| 2024/01 | Version 3.5.5.0? |
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