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