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SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

ISO/IEC cannot directly access some Cortex-M4 instructions. This section describes intrinsic functions that can generate
these instructions, provided by the CMIS and that might be provided by a C compiler. If a C compiler does not support an
appropriate intrinsic function, the user might have to use inline assembler to access some instructions.

The CMSIS provides the following intrinsic functions to generate instructions that ISO/IEC C code cannot directly access:

The CMSIS also provides a number of functions for accessing the special registers using MRS and MSR instructions:

CPSIE I

void __enable_irq(void)

CPSID I

void __disable_irq(void)

CPSIE F

void __enable_fault_irq(void)

CPSID F

void __disable_fault_irq(void)

ISB

void __ISB(void)

DSB

void __DSB(void)

DMB

void __DMB(void)

REV

uint32_t __REV(uint32_t int value)

REV16

uint32_t __REV16(uint32_t int value)

REVSH

uint32_t __REVSH(uint32_t int value)

RBIT

uint32_t __RBIT(uint32_t int value)

SEV

void __SEV(void)

WFI

void __WFI(void)

PRIMASK

Read

uint32_t __get_PRIMASK (void)

Write

void __set_PRIMASK (uint32_t value)

FAULTMASK 

Read

uint32_t __get_FAULTMASK (void)

Write

void __set_FAULTMASK (uint32_t value)

BASEPRI

Read

uint32_t __get_BASEPRI (void)

Write

void __set_BASEPRI (uint32_t value)

CONTROL

Read

uint32_t __get_CONTROL (void)

Write

void __set_CONTROL (uint32_t value)

MSP

Read

uint32_t __get_MSP (void)

Write

void __set_MSP (uint32_t TopOfMainStack)

PSP

Read

uint32_t __get_PSP (void)

Write

void __set_PSP (uint32_t TopOfProcStack)