MDK‑ARM includes the Keil RTX kernel, a deterministic, small‑footprint real‑time operating system that is royalty‑free. RTX comes with full source code and provides a complete set of features for creating and controlling multi‑threaded real‑time applications. It is fully compatible with the CMSIS‑RTOS API, which standardises the RTOS interface across Cortex‑M devices.
– Use your legacy license ID code (LIC). The offline licensing server for v4 is still operational as of 2025, but online activation may fail. Use the "Get LIC via Email" method.
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Complete setup for STM32F1, STM32F2, STM32F4 (early revisions), and STM32L1 series.
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MDK‑ARM 4.74 expanded the list of supported microcontrollers, most notably adding a substantial number of Atmel (now Microchip) SAM series devices. The new additions included:
The heart of the toolkit, offering a comprehensive project manager, editor, and debugger. MDK‑ARM includes the Keil RTX kernel, a deterministic,
| Feature | MDK-ARM 4.74 | MDK 5.31+ (Modern) | |---------|--------------|---------------------| | | .uvproj (binary) | .uvprojx (XML) | | Device inclusion | Built-in database | Software Packs (downloadable) | | Compiler options | ARMCC 4.1 only | Compiler 5, 6 (LLVM), or ARMCC | | RTOS support | RTX v4 | RTX5 (CMSIS-RTOS v2) | | Debug trace | ETM, ITM limited | Event Recorder, System Analyzer | | C++ standard | Up to C++98 with exceptions | C++14/17 with Clang | | License cost (2025) | Legacy perpetual (~$2k resale) | Node-locked (~$4k) or floating | | Security features | None | Arm TrustZone CMSE |
MDK-ARM Version 4.74 was a significant release from Keil, representing the culmination of the MDK v4 series before the transition to the modern, pack‑based MDK v5 architecture. This version continues to be a reference point for countless legacy projects and embedded systems courses. This article provides a comprehensive overview of MDK‑ARM 4.74, its key features, how it fits into the evolution of the toolchain, and its lasting relevance today. – Use your legacy license ID code (LIC)
The µVision4 IDE provides an all‑in‑one graphical environment for project management, source code editing, program compilation, and debugging. It includes a full instruction‑set simulator that allows developers to test and debug applications without physical hardware, significantly speeding up initial development cycles. The debugger supports hardware debugging via JTAG and Serial Wire Debug (SWD) using ULINK adapters, and it offers real‑time analysis capabilities such as event recording and code coverage.