APIs for Counting CPU Cycles

Introduction

For more details and example usage, see Cycle Counter

Functions
void	CycleCounterP_init (const uint64_t cpuFreqHz)
	initialize PMU Cycle Counter More...
uint32_t	CycleCounterP_getCount32 ()
	Get 32b CPU cycle counter value. More...
void	CycleCounterP_reset ()
	Enable, reset, clear overflow for CPU cycle counter. More...
uint64_t	CycleCounterP_getCount64 ()
	Get 64b CPU cycle counter value. More...
uint64_t	CycleCounterP_nsToTicks (const uint64_t nanosecs)
	API function to convert nanosecs to PMU counter ticks. More...

Function Documentation

CycleCounterP_init()

void CycleCounterP_init

(

const uint64_t

cpuFreqHz

)

initialize PMU Cycle Counter

CycleCounterP_getCount32()

uint32_t CycleCounterP_getCount32

(

)

Get 32b CPU cycle counter value.

Make sure to handle overflow condition in your application.

Returns

32b cycle counter value

CycleCounterP_reset()

void CycleCounterP_reset

(

)

Enable, reset, clear overflow for CPU cycle counter.

• Call this API atleast once before using CycleCounterP_getCount32() to reset and enable the counter
• Call this API to reset counter to zero.

CycleCounterP_getCount64()

uint64_t CycleCounterP_getCount64

(

)

Get 64b CPU cycle counter value.

Only support with below CPUs,

• A53

Returns

64b cycle counter value

CycleCounterP_nsToTicks()

uint64_t CycleCounterP_nsToTicks

(

const uint64_t

nanosecs

)

API function to convert nanosecs to PMU counter ticks.

Parameters

nanosecs

time unit in nano sec

Returns

PMU counter ticks