FreeRTOS vs PX5 RTOS

FreeRTOS is a real-time operating system for microcontrollers and small microprocessors. It supports more than 40 processor architectures and more than 15 toolchains, including RISC-V and ARMv8-M. Its kernel includes Symmetric Multiprocessing, which can schedule tasks across identical processor cores that share memory, and a thread-safe TCP stack with IPv6 support. Libraries for AWS IoT services are included, with reference integrations that demonstrate security practices. FreeRTOS is distributed under the MIT open source license and can be used for any purpose under that license. LTS libraries receive security updates and critical bug fixes for two years. Preconfigured demos are available for official ports, and Windows and Linux ports plus QEMU projects let developers experiment without special hardware. The listed plan costs nothing. Community contributions and professional support through a partner ecosystem are also listed; commercial licenses and safety certification are available through a strategic partner.

PX5 RTOS is a hard real-time operating system for resource-constrained embedded applications, with a native POSIX pthreads API. It is presented for safety-critical work in automotive, industrial, medical, rail, and other demanding settings. The maker says a minimal setup on typical 32-bit microcontrollers can use as little as 1KB of flash and 1KB of RAM. At 80MHz, most API calls and context switches are stated to take less than one microsecond; processing is described as predictable and independent of the number of active threads. Stated certifications include IEC 61508 SIL 4, IEC 62304 Class C, ISO 26262 ASIL D, and EN 50128 SW-SIL 4. Run-time checks cover function pointers, system objects, buffers, and stacks. Supported architectures include Arm Cortex-M, Cortex-R and Cortex-A, RISC-V, Renesas RX, AMD MicroBlaze, and Infineon TriCore. Listed tools include IAR, Eclipse/GCC, Arm DS, and Arm Keil. Pricing is on request; listed packages start at 5000.00 USD as a one-time fee or $5,000 a year for a subscription. Free evaluation kits are available with a free PX5 Community login.