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/* Copyright 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Tasks for timer test.
*/
#include "common.h"
#include "console.h"
#include "task.h"
#include "test_util.h"
#include "timer.h"
#include "util.h"
/* period between 500us and 128ms */
#define PERIOD_US(num) (((num % 256) + 1) * 500)
#define TEST_TIME (3 * SECOND)
#define ERROR_MARGIN 5
static int calculate_golden(uint32_t seed)
{
int golden = 0;
uint32_t elapsed = 0;
while (1) {
elapsed += PERIOD_US(seed);
++golden;
if (elapsed >= TEST_TIME)
return golden;
seed = prng(seed);
}
}
int task_timer(void *seed)
{
uint32_t num = (uint32_t)(uintptr_t)seed;
int golden_cnt = calculate_golden(num);
task_id_t id = task_get_current();
timestamp_t start;
int cnt = 0;
while (1) {
task_wait_event(-1);
ccprintf("\n[Timer task %d]\n", id);
start = get_time();
while (get_time().val - start.val < TEST_TIME) {
/* Wait for a "random" period */
task_wait_event(PERIOD_US(num));
ccprintf("%01d\n", id);
cnt++;
/* next pseudo random delay */
num = prng(num);
}
ccprintf("Task %d: Count=%d Golden=%d\n", id, cnt, golden_cnt);
cnt -= golden_cnt;
if (cnt < 0)
cnt = -cnt;
if (cnt > ERROR_MARGIN) {
ccprintf("Count differs from Golden by more than %d!\n",
ERROR_MARGIN);
test_fail();
}
}
return EC_SUCCESS;
}
void run_test(void)
{
wait_for_task_started();
task_wake(TASK_ID_TMRD);
task_wake(TASK_ID_TMRC);
task_wake(TASK_ID_TMRB);
task_wake(TASK_ID_TMRA);
usleep(TEST_TIME + SECOND);
test_pass();
}
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