CMSIS Global Defines

Topics
	Defines and Type Definitions
	Type definitions and defines for Cortex-M processor based devices.

Macros
#define	__I   volatile const
#define	__O   volatile
#define	__IO   volatile

Detailed Description

IO Type Qualifiers are used

• to specify the access to peripheral variables.
• for automatic generation of peripheral register debug information.

Macro Definition Documentation

__I

#define __I   volatile const

Defines 'read only' permissions

__O

#define __O   volatile

Defines 'write only' permissions

__IO

#define __IO   volatile

Defines 'read / write' permissions