PM0215 datasheet(35/91 Pages) STMICROELECTRONICS

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PM0215

The STM32 Cortex-M0 instruction set

Doc ID 022979 Rev 1

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3.2

CMSIS intrinsic functions

ISO/IEC C code cannot directly access some Cortex-M0 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, you might have to use an inline assembler to access some instructions.

The CMSIS provides the intrinsic functions listed in Table 15 to generate instructions that

ISO/TEC C code cannot directly access.

The CMSIS also provides a number of functions for accessing the special registers using

MRS

and MSR instructions (see Table 16).

Table 15.

CMSIS intrinsic functions to generate some Cortex-M0 instructions

Instruction

CMSIS intrinsic function

CPSIE I

void __enable_irq(void)

CPSID I

void __disable_irq(void)

ISB

void __ISB(void)

DSB

void __DSB(void)

DMB

void __DMB(void)

NOP

void __NOP(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)

SEV

void __SEV(void)

WFE

void __WFE(void)

WFI

void __WFI(void)

Table 16.

CMSIS intrinsic functions to access the special registers

Special register

Access

CMSIS function

PRIMASK

Read

uint32_t __get_PRIMASK (void)

Write

void __set_PRIMASK (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)

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