63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
/* 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 scheduling 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 "timer.h"
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#include "util.h"
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uint32_t difftime(timestamp_t t0, timestamp_t t1)
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{
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return (uint32_t)(t1.val-t0.val);
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}
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int timer_calib_task(void *data)
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{
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timestamp_t t0, t1;
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unsigned d;
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while (1) {
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task_wait_event(-1);
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ccprintf("\n=== Timer calibration ===\n");
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t0 = get_time();
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t1 = get_time();
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ccprintf("- back-to-back get_time : %d us\n", difftime(t0, t1));
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/* Sleep for 5 seconds */
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ccprintf("- sleep 1s :\n ");
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cflush();
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ccprintf("Go...");
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t0 = get_time();
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usleep(1000000);
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t1 = get_time();
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ccprintf("done. delay = %d us\n", difftime(t0, t1));
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/* try small usleep */
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ccprintf("- short sleep :\n");
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cflush();
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for (d = 128; d > 0; d = d / 2) {
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t0 = get_time();
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usleep(d);
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t1 = get_time();
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ccprintf(" %d us => %d us\n", d, difftime(t0, t1));
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cflush();
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}
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ccprintf("Done.\n");
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}
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return EC_SUCCESS;
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}
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void run_test(int argc, char **argv)
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{
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task_wake(TASK_ID_TESTTMR);
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}
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