forked from Imagelibrary/rtems
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/**
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* @file
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*
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* @brief RTEMS Benchmark Timer API for all Boards
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*/
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/*
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* COPYRIGHT (c) 2011 Ralf Corsépius Ulm/Germany
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*
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* Derived from libcsupport/include/timerdrv.h:
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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/*
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* All the functions declared as extern after this comment
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* MUST be implemented in each BSP.
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*/
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#ifndef _RTEMS_BTIMER_H
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#define _RTEMS_BTIMER_H
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#include <stdbool.h>
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#include <stdint.h>
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#include <rtems/rtems/status.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @defgroup BenchmarkTimer Benchmark Timer Driver Interface
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*
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* This module defines the interface for the Benchmark Timer Driver.
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*
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* The following methods in this module must be provided by each BSP:
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*
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* - benchmark_timer_initialize
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* - benchmark_timer_read
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* - benchmark_timer_disable_subtracting_average_overhead
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*
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* The units measured are BSP specific but should be at the highest
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* granularity possible.
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*
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* The Benchmark Timer may use the same hardware as the Clock Driver.
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* No RTEMS Timing Tests will use both drivers at the same time.
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*/
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/**
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* @brief This type is used to return a Benchmark Timer value.
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*
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* This type is used to contain benchmark times. The units are BSP specific.
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*/
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typedef uint32_t benchmark_timer_t;
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/**
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* @brief Initialize the Benchmark Timer
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*
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* This method initializes the benchmark timer and resets it to begin
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* counting.
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*/
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extern void benchmark_timer_initialize( void );
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/**
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* @brief Read the Benchmark Timer
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*
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* This method stops the benchmark timer and returns the number of
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* units that have passed since @a benchmark_timer_initialize was invoked.
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*
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* @return This method returns the number of units with the average overhead
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* removed. If the value is below the minimum trusted value, zero
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* is returned.
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*/
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extern benchmark_timer_t benchmark_timer_read( void );
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/**
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* @brief Benchmark Timer Empty Function
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*
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* This method is used to determine loop overhead.
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*/
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extern rtems_status_code benchmark_timer_empty_function( void );
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/**
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* @brief Disable Average Overhead Removal from the Benchmark Timer
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*
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* This method places the benchmark timer in a "raw" mode where it
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* returns the actual number of units which have passed between
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* calls to @a benchmark_timer_initialize and @a benchmark_timer_read
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* counting.
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*
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* @param[in] find_flag indicates to enable or disable the mode
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*/
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extern void benchmark_timer_disable_subtracting_average_overhead(
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bool find_flag
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);
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/**@}*/
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#ifdef __cplusplus
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}
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#endif
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#endif
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