STMicroelectronics has added low-layer application program interface (LL API)

This is for experienced designers and will allow them to work with the ARM Cortex-M microcontrollers (MCUs) down to register-level code, to controlling device peripheral and to optimise performance and run-time efficiency.

The LL APIs are integrated into the STM32Cube packages with example projects designed to run on STM32 Nucleo development boards.

The LL APIs can be used in parallel with the corresponding hardware abstraction layers (HALs) in the same project, making it possible to trade-off between project time and performance parameters such as software footprint, and run-time efficiency.

Like the HALs in each STM32Cube embedded software package, the LL APIs are MISRA-C 2004 compliant with a few exceptions that are fully listed and explained.

They have been checked using Grammatech CodeSonar for optimum code quality and reliability. The LL APIs are always kept in line with the latest release version through an automatic-update mechanism inside the STM32CubeMX SW package.

Free of charge, open-source BSD LL APIs are currently available in the STMCube packages for STM32L4, L0, and F0 MCU series, with full deployment across the STMCube spectrum scheduled for Q1 2017.

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