STMicroelectronics STM32Cube Low-Layer Application Program Interface (LL API) driver software

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STMicroelectronics has augmented its 32-bit microcontroller development ecosystem with the introduction of the STM32Cube Low-Layer Application Program Interface (LL API) software. LL APIs enable expert designers using the STM32 ARM Cortex-M microcontrollers (MCU) to work closer to the hardware, down to register-level code, to optimise performance and run-time efficiency.

With the introduction of the LL APIs, the STM32Cube environment now offers designers complete flexibility in controlling device peripherals — from the easy-to-use and portable HALs (hardware abstraction layers) to the highly optimised LL APIs — allowing customers to focus on their applications using validated ST software.

The LL APIs are integrated into the STM32Cube packages with example projects designed to run on STM32 Nucleo development boards, while it is easy and straightforward to port the examples to other STM32 boards. They can be used in parallel with the corresponding HALs in the same project, giving designers flexibility in determining the optimum trade-off between time to market, software footprint and run-time efficiency.

The LL APIs offer an easy migration path from the older STM32 Standard Peripheral Libraries (SPL) to the STMCube ecosystem. They 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 kept in line with the latest release version through an automatic-update mechanism inside the STM32CubeMX SW package. They are currently available in the STMCube packages for STM32L4, L0 and F0 MCU series.