The Definitive Guide to ARM® Cortex®-M0 and Cortex-M0+ Processors, 2nd Edition

Appendix C

CMSIS-CORE Quick Reference

C.1. Overview

The Cortex^® Microcontroller Software Interface Standard (CMSIS) contains a number of standardized functions:

• Core peripheral access functions

• Core register access functions

• Special instruction access functions.

This appendix covers the basic information about these functions, and other information related to using CMSIS.

C.2. Data Type

Some of the functions in the CMSIS-CORE API use standard data types defined in “stdint.h” (part of the C99 specification), as listed in Table C.1.

Table C.1

C99 standard data type used in CMSIS-CORE

Type	Data
uint32_t	Unsigned 32-bit integer
uint16_t	Unsigned 16-bit integer
uint8_t	Unsigned 8-bit integer

C.3. Exception Enumeration

Instead of using integer values for exception ...