btimer.c File Reference

Timer driver for the Hitachi SH 7750. More...

#include <rtems.h>
#include <rtems/btimer.h>
#include <rtems/score/sh_io.h>
#include <rtems/score/iosh7750.h>

Macros
#define	TIMER_PRIO   15
#define	TIMER_PRESCALER   4
#define	TCR1_TPSC   SH7750_TCR_TPSC_DIV4
#define	TIMER_VECTOR   SH7750_EVT_TO_NUM(SH7750_EVT_TUNI1)
#define	AVG_OVERHEAD   0 /* It typically takes X.X microseconds */
#define	LEAST_VALID   0 /* 20 */ /* Don't trust a clicks value lower than this */

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

Variables
uint32_t	bsp_clicks_per_second
bool	benchmark_timer_find_average_overhead

Detailed Description

Timer driver for the Hitachi SH 7750.

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.