Micrium's realtime OS, μC/OS III, now supports Cypress Semiconductor's PSoC 5 (Fig. 1) configurable microcontrollers. Micrium's RTOS has been showing up on a number of platforms including robot development kits from Texas Instruments and Renesas RX62N development kit. These kits are also covered in Micrium's μC/OS III book.

The PSoC 5 adds to an extensive list of platforms that Micrium supports including the ARM7/9, Cortex-MX, Nios-II, PowerPC, Coldfire, i.MX, Microblaze, H8, SH, M16C, M32C, and Blackfin. The RTOS supports an unlimited number of priorities but it is configurable as most embedded applications only need about 32 to 256 levels. It protects critical regions by disabling interrupts with minimal overhead providing deterministic interrupt response. μC/OS III checks for NULL pointers on task level service calls. It also makes sure arguments are within allowable range and specified options are valid. All API function return an error code.

μC/OS III is written in ANSI C. It has a small footprint that is based on the features selected and the overall configuration settings. It comes with a round-robin scheduler.

The PSoC 5 is based on the Arm 32-bit Cortex-M3. The other PSoC platforms utilize 8-bit microprocessor cores that are not suitable for Micrium's latest RTOS. All the PSoC platforms include configurable analog and digital blocks that can be combined to form standard interfaces such as serial ports and ADCs as well as custom peripherals.

μC/OS III is a nice, compact RTOS and the PSoC 5 is a flexible micro. What more is there to say? It's a very nice combination.