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AN673

PRECISION32™ SOFTWARE DEVELOPMENT KIT

Silicon Laboratories 

AN673

3. Hardware Access Layer

CMSIS is the Cortex Microcontroller Software Interface Standard, and the Hardware Access Layer (HAL) is a

defined part of this standard.

The HAL provides an access layer for the SiM3xxxx device registers. The functions and macros are non-blocking

and simple; they cannot return error codes, so they are designed to never fail. The HAL is designed to replace the

individual bit field accesses of the module with a function name that describes the action the bit is controlling.

Note: HAL functions and macros are not designed to be thread-safe. These routines do not disable interrupts during non-

monotonic register modifications.

The HAL sits one layer above the hardware and is the only code that accesses the registers directly. More complex

firmware systems like a Real Time Operating System (RTOS) or code example call the HAL and CMSIS routines.

4. Code Examples

The code examples are simple and complete examples that illustrate and highlight the peripheral modes and

features using the HAL. They are also modular so code can be copied into an application base, making peripheral-

specific code development easy.

5. si32Library

A 32-bit platform with large memory enables a big and complex firmware system on the device. This complexity

can slow development, as firmware consists of more layers with interweaving tasks and threads that are more

difficult to create and debug.

The si32Library is a set of flexible, reusable, and portable source modules enabling core application level

functionality for Silicon Laboratories 32-bit Precision32™ MCUs. It includes facilities for debug logging, memory

allocation, data collections, data transfers, and cooperative multitasking. The si32Library package provides

working abstractions of the hardware layer, reduces coding effort, and provides structure to aid and speed up top-

layer application development.

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