AN664中文资料SILABS数据手册PDF规格书

Introduction

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.