ST STM32F0 Series User Manual

PM0215 The STM32 Cortex-M0 instruction set
Doc ID 022979 Rev 1 35/91
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 1 5 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 Ta bl e 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)

ST STM32F0 Series Specifications

General

Brand	ST
Model	STM32F0 Series
Category	Microcontrollers
Language	English