Macros
#define	__CMSIS_GCC_OUT_REG(r) "=r" (r)

#define	__CMSIS_GCC_RW_REG(r) "+r" (r)

#define	__CMSIS_GCC_USE_REG(r) "r" (r)

#define	__NOP() __ASM volatile ("nop")
	No Operation. More...

#define	__WFI() __ASM volatile ("wfi":::"memory")
	Wait For Interrupt. More...

#define	__WFE() __ASM volatile ("wfe":::"memory")
	Wait For Event. More...

#define	__SEV() __ASM volatile ("sev")
	Send Event. More...

#define	__BKPT(value) __ASM volatile ("bkpt "#value)
	Breakpoint. More...

Functions
__STATIC_FORCEINLINE void	__ISB (void)
	Instruction Synchronization Barrier. More...

__STATIC_FORCEINLINE void	__DSB (void)
	Data Synchronization Barrier. More...

__STATIC_FORCEINLINE void	__DMB (void)
	Data Memory Barrier. More...

__STATIC_FORCEINLINE uint32_t	__REV (uint32_t value)
	Reverse byte order (32 bit) More...

__STATIC_FORCEINLINE uint32_t	__REV16 (uint32_t value)
	Reverse byte order (16 bit) More...

__STATIC_FORCEINLINE int16_t	__REVSH (int16_t value)
	Reverse byte order (16 bit) More...

__STATIC_FORCEINLINE uint32_t	__ROR (uint32_t op1, uint32_t op2)
	Rotate Right in unsigned value (32 bit) More...

__STATIC_FORCEINLINE uint32_t	__RBIT (uint32_t value)
	Reverse bit order of value. More...

__STATIC_FORCEINLINE uint8_t	__CLZ (uint32_t value)
	Count leading zeros. More...

__STATIC_FORCEINLINE int32_t	__SSAT (int32_t val, uint32_t sat)
	Signed Saturate. More...

__STATIC_FORCEINLINE uint32_t	__USAT (int32_t val, uint32_t sat)
	Unsigned Saturate. More...

Detailed Description

Access to dedicated instructions

Macro Definition Documentation

§ __CMSIS_GCC_OUT_REG

#define __CMSIS_GCC_OUT_REG ( r ) "=r" (r)

Referenced by __CLZ(), __REV(), __REV16(), and __REVSH().

§ __CMSIS_GCC_RW_REG

#define __CMSIS_GCC_RW_REG ( r ) "+r" (r)

§ __CMSIS_GCC_USE_REG

#define __CMSIS_GCC_USE_REG ( r ) "r" (r)

Referenced by __CLZ(), __REV(), __REV16(), and __REVSH().

§ __NOP

#define __NOP ( ) __ASM volatile ("nop")

No Operation.

No Operation does nothing. This instruction can be used for code alignment purposes.

Referenced by __NVIC_SystemReset().

§ __WFI

#define __WFI ( ) __ASM volatile ("wfi":::"memory")

Wait For Interrupt.

Wait For Interrupt is a hint instruction that suspends execution until one of a number of events occurs.

§ __WFE

#define __WFE ( ) __ASM volatile ("wfe":::"memory")

Wait For Event.

Wait For Event is a hint instruction that permits the processor to enter a low-power state until one of a number of events occurs.

§ __SEV

#define __SEV ( ) __ASM volatile ("sev")

Send Event.

Send Event is a hint instruction. It causes an event to be signaled to the CPU.

§ __BKPT

#define __BKPT ( value ) __ASM volatile ("bkpt "#value)

Breakpoint.

Causes the processor to enter Debug state. Debug tools can use this to investigate system state when the instruction at a particular address is reached.

Parameters

[in] value is ignored by the processor. If required, a debugger can use it to store additional information about the breakpoint.

Function Documentation

§ __ISB()

__STATIC_FORCEINLINE void __ISB ( void )

Instruction Synchronization Barrier.

Instruction Synchronization Barrier flushes the pipeline in the processor, so that all instructions following the ISB are fetched from cache or memory, after the instruction has been completed.

References __ASM.

Referenced by __NVIC_DisableIRQ(), and IntSetPend().

§ __DSB()

__STATIC_FORCEINLINE void __DSB ( void )

Data Synchronization Barrier.

Acts as a special kind of Data Memory Barrier. It completes when all explicit memory accesses before this instruction complete.

References __ASM.

Referenced by __NVIC_DisableIRQ(), and __NVIC_SystemReset().

§ __DMB()

__STATIC_FORCEINLINE void __DMB ( void )

Data Memory Barrier.

Ensures the apparent order of the explicit memory operations before and after the instruction, without ensuring their completion.

References __ASM.

§ __REV()

__STATIC_FORCEINLINE uint32_t __REV ( uint32_t value )

Reverse byte order (32 bit)

Reverses the byte order in unsigned integer value. For example, 0x12345678 becomes 0x78563412.

Parameters

[in] value Value to reverse

Returns: Reversed value

References __ASM, __CMSIS_GCC_OUT_REG, and __CMSIS_GCC_USE_REG.

§ __REV16()

__STATIC_FORCEINLINE uint32_t __REV16 ( uint32_t value )

Reverse byte order (16 bit)

Reverses the byte order within each halfword of a word. For example, 0x12345678 becomes 0x34127856.

Parameters

[in] value Value to reverse

Returns: Reversed value

References __ASM, __CMSIS_GCC_OUT_REG, and __CMSIS_GCC_USE_REG.

§ __REVSH()

__STATIC_FORCEINLINE int16_t __REVSH ( int16_t value )

Reverse byte order (16 bit)

Reverses the byte order in a 16-bit value and returns the signed 16-bit result. For example, 0x0080 becomes 0x8000.

Parameters

[in] value Value to reverse

Returns: Reversed value

References __ASM, __CMSIS_GCC_OUT_REG, and __CMSIS_GCC_USE_REG.

§ __ROR()

__STATIC_FORCEINLINE uint32_t __ROR	(	uint32_t	op1,
		uint32_t	op2
	)

Rotate Right in unsigned value (32 bit)

Rotate Right (immediate) provides the value of the contents of a register rotated by a variable number of bits.

Parameters

[in]	op1	Value to rotate
[in]	op2	Number of Bits to rotate

Returns: Rotated value

§ __RBIT()

__STATIC_FORCEINLINE uint32_t __RBIT ( uint32_t value )

Reverse bit order of value.

Reverses the bit order of the given value.

Parameters

[in] value Value to reverse

Returns: Reversed value

References __ASM.

§ __CLZ()

__STATIC_FORCEINLINE uint8_t __CLZ ( uint32_t value )

Count leading zeros.

Counts the number of leading zeros of a data value.

Parameters

[in] value Value to count the leading zeros

Returns: number of leading zeros in value

References __ASM, __CMSIS_GCC_OUT_REG, __CMSIS_GCC_USE_REG, __LDREXW(), __STATIC_FORCEINLINE, and __STREXW().

§ __SSAT()

__STATIC_FORCEINLINE int32_t __SSAT	(	int32_t	val,
		uint32_t	sat
	)

Signed Saturate.

Saturates a signed value.

Parameters

[in]	val	Value to be saturated
[in]	sat	Bit position to saturate to (1..32)

Returns: Saturated value

§ __USAT()

__STATIC_FORCEINLINE uint32_t __USAT	(	int32_t	val,
		uint32_t	sat
	)

Unsigned Saturate.

Saturates an unsigned value.

Parameters

[in]	val	Value to be saturated
[in]	sat	Bit position to saturate to (0..31)

Returns: Saturated value

References __ASM, __STATIC_FORCEINLINE, and __SXTB16_RORn.

Macros

Functions

Detailed Description

Macro Definition Documentation

§ __CMSIS_GCC_OUT_REG

§ __CMSIS_GCC_RW_REG

§ __CMSIS_GCC_USE_REG

§ __NOP

§ __WFI

§ __WFE

§ __SEV

§ __BKPT

Function Documentation

§ __ISB()

§ __DSB()

§ __DMB()

§ __REV()

§ __REV16()

§ __REVSH()

§ __ROR()

§ __RBIT()

§ __CLZ()

§ __SSAT()

§ __USAT()