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