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/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <inttypes.h>
#include <rtems.h>
#include <rtems/counter.h>
#define TESTS_USE_PRINTF
#include "tmacros.h"
#define NS_PER_TICK 1000000
static rtems_interval sync_with_clock_tick(void)
{
rtems_interval start = rtems_clock_get_ticks_since_boot();
rtems_interval current;
do {
current = rtems_clock_get_ticks_since_boot();
} while (current == start);
return current;
}
static void test_converter(void)
{
CPU_Counter_ticks frequency = rtems_counter_nanoseconds_to_ticks(1000000000);
uint64_t ns = rtems_counter_ticks_to_nanoseconds(frequency);
printf("CPU counter frequency: %" PRIu32 "Hz\n", frequency);
printf("nanoseconds for frequency count ticks: %" PRIu64 "\n", ns);
rtems_test_assert(ns == 1000000000);
}
static void test_delay_nanoseconds(void)
{
rtems_counter_ticks start;
rtems_counter_ticks end;
rtems_counter_ticks delta;
double ns_per_tick = NS_PER_TICK;
uint64_t ns_delta;
rtems_interval tick;
int n = 10;
int i;
printf("test delay nanoseconds (%i times)\n", n);
for (i = 0; i < n; ++i) {
tick = sync_with_clock_tick();
start = rtems_counter_read();
rtems_counter_delay_nanoseconds(NS_PER_TICK);
end = rtems_counter_read();
rtems_test_assert(tick < rtems_clock_get_ticks_since_boot());
delta = rtems_counter_difference(end, start);
ns_delta = rtems_counter_ticks_to_nanoseconds(delta);
/* Special case for CPU counters using the clock driver counter */
if (ns_delta < rtems_configuration_get_nanoseconds_per_tick()) {
printf(
"warning: the RTEMS counter seems to be unable to\n"
" measure intervals greater than the clock tick interval\n"
);
ns_delta += rtems_configuration_get_nanoseconds_per_tick();
}
printf(
"busy wait duration: %" PRIu64 "ns\n"
"busy wait relative to clock tick: %f\n",
ns_delta,
(ns_delta - ns_per_tick) / ns_per_tick
);
}
}
static void Init(rtems_task_argument arg)
{
puts("\n\n*** TEST SPCPUCOUNTER 1 ***");
test_converter();
test_delay_nanoseconds();
puts("*** END OF TEST SPCPUCOUNTER 1 ***");
rtems_test_exit(0);
}
#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
#define CONFIGURE_MICROSECONDS_PER_TICK (NS_PER_TICK / 1000)
#define CONFIGURE_MAXIMUM_TASKS 1
#define CONFIGURE_INIT_TASK_ATTRIBUTES RTEMS_FLOATING_POINT
#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
#define CONFIGURE_INIT
#include <rtems/confdefs.h>
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