timer.c File Reference

IDT 4650 Timer Driver. More...

#include <rtems.h>
#include <rtems/btimer.h>

Macros
#define	CLOCKS_PER_MICROSECOND   ( CPU_CLOCK_RATE_MHZ )
#define	TIMER_MAX_VALUE   0xffffffff
#define	AVG_OVERHEAD   8 /* It typically takes X.X microseconds */
#define	LEAST_VALID   1 /* Don't trust a clicks value lower than this */

Functions
uint32_t	mips_read_timer (void)
void	benchmark_timer_initialize (void)
	Initialize the Benchmark Timer. More...
benchmark_timer_t	benchmark_timer_read (void)
	Read the Benchmark Timer. More...
void	benchmark_timer_disable_subtracting_average_overhead (bool find_flag)
	Disable Average Overhead Removal from the Benchmark Timer. More...

Detailed Description

IDT 4650 Timer Driver.

This file manages the benchmark timer used by the RTEMS Timing Test Suite.

Function Documentation

benchmark_timer_disable_subtracting_average_overhead()

void benchmark_timer_disable_subtracting_average_overhead

(

bool

find_flag

)

Disable Average Overhead Removal from the Benchmark Timer.

This method places the benchmark timer in a "raw" mode where it returns the actual number of units which have passed between calls to benchmark_timer_initialize and benchmark_timer_read counting.

Parameters

[in]

find_flag

indicates to enable or disable the mode

benchmark_timer_initialize()

void benchmark_timer_initialize

(

void

)

Initialize the Benchmark Timer.

This method initializes the benchmark timer and resets it to begin counting.

benchmark_timer_read()

benchmark_timer_t benchmark_timer_read

(

void

)

Read the Benchmark Timer.

This method stops the benchmark timer and returns the number of units that have passed since benchmark_timer_initialize was invoked.

Returns

This method returns the number of units with the average overhead removed. If the value is below the minimum trusted value, zero is returned.