WITTENSTEIN high integrity systems

WITTENSTEIN high integrity systems- experts in embedded RTOS and Middleware technology with a specialization in safety certified software. Supplying advanced RTOS and Middleware components across a broad range of market sectors and applications. From basic embedded designs, up to complex safety systems demanding the highest levels of certification.


SAFERTOS has been performing in Arm environments since its creation. SAFERTOS has a wide range of support for Arm cores, and provides developers with a highly responsive, small footprint, safety critical Real-Time Operating System that is easy to install and integrate. SAFERTOS is supplied with full source code, and a Design Assurance Pack specific to the selected processor or compiler combination. This provides an ‘out of the box’ product that requires no retesting on the target hardware.

SAFERTOS is available pre-certified to IEC 61508 SIL3 and ISO 26262 ASIL D, and is certifiable for many other industry standards: if your next project is safety critical, then using SAFERTOS in your Arm environment is a winning combination.

Andrew Longhurst, Managing Director, WITTENSTEIN high integrity systems

Functional Safety related products

SAFERTOS is a pre-certified safety Real Time Operating System (RTOS) for embedded processors. It delivers superior performance and pre-certified dependability, while utilizing minimal resources.

WHIS’s extensive Safety Critical design experience has made certifying SAFERTOS integrated within a product an easy and hassle-free process.

Contained within the Design Assurance Pack is the all-important Safety Manual. The Safety Manual explains exactly how to install and integrate SAFERTOS into your development environment. Following the concise instructions will also generate the evidence that is required by your auditors to confirm that the process has been followed correctly. This removes the need to retest SAFERTOS on your target hardware, and provides a solid dependable platform for your development.

In many safety critical applications, the Real-Time Operating System is the most critical component. The RTOS not only schedules the functionality of the software, it also schedules the operation of Safety Monitors and Safety Functions. The RTOS is frequently used to isolate safety critical code, ensuring it can operate without interference from other tasks. A failure in the RTOS will most likely compromise the Safety Case of the complete system.

SAFERTOS has been designed specifically for the safety sector, and the deterministic priority-based scheduling is the primary safety requirement. Every effort has been made to ensure that deterministic behavior is maintained. To ensure this SAFERTOS has been independently certified many times on numerous platforms, to IEC61508-3 SIL3 and ISO 26262 ASIL D, the highest possible SIL level for a software only component.

Functional Safety resources

SAFERTOS full featured binary evaluation packages for numerous Arm-based architectures are freely available for download from the WHIS website.

The WHIS RTOS resource center is a great source of information relating to the selection and use of safety critical Real Time Operating Systems. The resource center contains App Notes, User Guides, White Papers and Training Videos, and can be accessed from our website.

As WITTENSTEIN high integrity systems are first and foremost a Safety Systems Company, they can also offer all important extra services:

  • Safety Critical design review services
  • SAFERTOS training including safety-related requirements
  • Safe integration of middleware and full BSP's solutions