Micro Digital eheap

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eheap is a bin-type heap that provides adaptability, safety, and high performance for embedded systems running on RTOSes or standalone. It is intended to be a good fit for the many requirements of embedded systems. It can be easily tuned to the needs of your system, achieving high performance and minimal fragmentation. In addition, it offers some interesting debug and self-healing options.

Features:

Multiple heap support for secure systems
Aligned allocations
Arm® Cortex® v7M MPU region allocations
Integral 8-byte and 12-byte block pools
Configurable number of bins and sizes
Deferred free chunk merging
Bin sort and bin seed
Self healing via bidirectional scanning
Debug chunks and statistics aid debugging
High performance and deterministic operation
Small code and data footprint
RTOS and compiler agnostic
Licensed standalone and as part of SMX

eheap can efficiently support any number of heaps. Each can be independently configured to support tiny to very large heaps, each with an appropriate number of bins and other features. Having multiple heaps is essential for achieving 100% isolation of partitions in secure systems.

Allocations can be aligned on any power-of-two boundary from 8 up to a specified maximum. Allocation efficiency is improved by accumulation of spare space in chunks ahead of chunks with aligned blocks. This also results in steady growth of aligned blocks, which improves aligned allocation performance.

eheap supports Arm® Cortex®-v7M MPU region allocations, thus permitting dynamic region creation at runtime. This is simpler and more flexible than static region creation at compile time. To do this, allocated regions must have power-of-two sizes and be aligned on their sizes. eheap uses subregions to greatly improve the efficiency of region allocations.

Integral block pools have been added to greatly improve the speed and efficiency of small-block allocations for object-oriented languages such as C++. The pools operate like normal heap operations and if a pool becomes empty, blocks are transparently allocated from the main heap. Thus, block pools can be sized for normal, rather than peak requirements.

ST Products
STM32 32-bit Arm Cortex MCUs

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