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/**
* @file benchmark_timer.c
*
* @ingroup tms570
*
* @brief clock functions definitions.
*/
/*
* Copyright (c) 2014 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* Based on LPC24xx and LPC1768 BSP
* by embedded brains GmbH and others
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <bsp/system-clocks.h>
#include <rtems/btimer.h>
#include <rtems/timerdrv.h>
bool benchmark_timer_find_average_overhead = false;
static uint32_t benchmark_timer_base;
void benchmark_timer_initialize(void)
{
benchmark_timer_base = _CPU_Counter_read();
}
uint32_t benchmark_timer_read(void)
{
uint32_t delta = _CPU_Counter_read() - benchmark_timer_base;
if (benchmark_timer_find_average_overhead) {
return delta;
} else {
/* TODO check on hardware */
if (delta > 74) {
return delta - 74;
} else {
return 0;
}
}
}
void benchmark_timer_disable_subtracting_average_overhead(bool find_average_overhead )
{
benchmark_timer_find_average_overhead = find_average_overhead;
}
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