3.2.2

Examples based on the middleware components

Each middleware component comes with one or more examples (called also applications) showing how to use it.

Integration examples that use several middleware components are provided as well.

3.3

Level 2

This level is composed of a single layer that consists in a global real-time and graphical demonstration based on

the middleware service layer, the low-level abstraction layer, and the basic peripheral usage applications for board

based features.

3.4

Utilities

Alike all STM32Cube firmware packages, the STM32CubeU5 provides a set of utilities that offer miscellaneous

software and additional system resources services. They can be used either by the application, or the different

STM32Cube firmware intrinsic middleware and components.

3.4.1

LPBAM utility

The STM32U5 series embeds the Low Power Background Autonomous Mode subsystem, which is s an

operating mode that allows peripherals to be functional and autonomous independently from power modes and

without any software running. It can chain diverse operations thanks to DMA linked-list transfers.

The LPBAM utility is a set of modular drivers located under the utilities folder in the STM32Cube firmware

package. It provides two user levels of abstraction: Basic and advanced levels.

Figure 3. LPBAM utility layers

The LPBAM utility is based on layers:

•

The first level of abstraction is a hardware agnostic layer named basic LPBAM layer. It gives to the users a

full granularity of scenarios creation via transversal APIs.

•

The second level of abstraction is a hardware agnostic layer named advanced LPBAM layer. It provides a

predefined scenario (set of elementary nodes) that can be customized and concatenated to build an end

user application.

•

The platform layer contains device specific constants to be used by the applicative side.

•

The LL LPBAM layer (low level) is used by the basic and the advanced LPBAM layers. It contains the

device specific mechanisms for each supported peripheral.

UM2883

STM32CubeU5 architecture overview

UM2883 - Rev 4

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