Express Logic’s ThreadX with Downloadable Application Modules Brings Big-System Features to Cortex-M3/-M4

ThreadX® apps gain remote-update capabilities and memory protection

(October 02, 2013)

Express Logic, Inc., the worldwide leader in royalty-free real-time operating systems (RTOSes), today announced the immediate availability of ThreadX with Downloadable Application Modules (ThreadX with DAMs) for ARM Cortex-M3/-M4 systems. ThreadX with DAMs enables ThreadX-based applications to dynamically run application code that is not statically linked with the main system executable image. This enables selected application threads to be packaged into a module and guarded by the Cortex-M3/-M4 MPU. This also helps to prevent unintended access from outside the module’s memory space and protect the system from any unintended actions of threads within a module.

With ThreadX with DAMs, applications gain increased functionality without the cost or footprint of additional memory. This is because the DAMs can be dynamically activated to provide additional functionality, such as on-demand reconfiguration and application updates for deployed systems. The ThreadX with DAMs technology is ideal for situations in which total application code size exceeds available memory, new application modules need to be added after the product is deployed, or partial firmware updates are required. For greater system security, the technology also enables memory protection of individual threads and groups of threads.

The architecture of the kernel-module structure used in ThreadX with DAM is one that is not typically found in RTOSes serving Cortex-M3/-M4 systems. Instead, the architecture mirrors the kernel-module structure more commonly found in large virtual-memory operating systems, such as Windows and Linux. The Module Manager that is part of ThreadX with DAMs and resident within the ThreadX kernel interfaces with each module and fields all module requests for ThreadX API services. Although there is only one copy of the Module Manager, there is no limit on the number of modules that can be loaded at one time or the number of threads in any one module.

If desired, selected application threads can be linked directly with the ThreadX kernel and made to reside in target memory as part of its main executable image, rather than as part of a module. This option enables developers to avoid having to reload the modules containing these threads and helps to guarantee the best possible performance.

For more information on Express Logic's new Downloadable Application Modules, see: ThreadX Downloadable Modules

“With the introduction of ThreadX with Downloadable Application Modules for Cortex-M3 and -M4 systems, ThreadX gains the functionality previously found only in larger, more expensive RTOSes while continuing to provide the small footprint, high performance, and ease of use that more than one billion ThreadX-based systems are known for,” noted William E. Lamie, President of Express Logic. “Using ThreadX with Downloadable Application Modules, developers can structure their applications with greater functionality and protection from external interference than ever before.”

About Express Logic and ThreadX

Headquartered in San Diego, CA, Express Logic, Inc., offers the industry’s most advanced run-time solutions for deeply embedded applications, including the popular ThreadX® RTOS, the high-performance NetX™ and NetX Duo™ TCP/IP stacks, the FileX® embedded FAT-compatible file system, the USBX™ Host/Device USB protocol stack, and the GUIX™ embedded graphical user interface development toolkit. Most products from Express Logic include full source-code and all are available free of run-time royalties. For more information about Express Logic solutions, please visit, call 1-888-THREADX, or email inquiries to

For More Information Contact:

Michael May
VP of Marketing
Express Logic, Inc.
Tel: (858) 613-6640 ext.207

Angie Hatfield
Media Relations
Hughes Communications, Inc.
(425) 941-2895
Cell: (425) 941-2895