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/* Copyright (c) 2011 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.
* Copyright 2011 Google Inc.
*
* Tasks for scheduling test.
*/
#include "common.h"
#include "uart.h"
#include "task.h"
#include "timer.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;
uart_printf("\n=== Timer calibration ===\n");
t0 = get_time();
t1 = get_time();
uart_printf("- back-to-back get_time : %d us\n", difftime(t0, t1));
/* Sleep for 5 seconds */
uart_printf("- sleep 1s :\n ");
uart_flush_output();
uart_printf("Go...");
t0 = get_time();
usleep(1000000);
t1 = get_time();
uart_printf("done. delay = %d us\n", difftime(t0, t1));
/* try small usleep */
uart_printf("- short sleep :\n");
uart_flush_output();
for (d=128 ; d > 0; d = d / 2) {
t0 = get_time();
usleep(d);
t1 = get_time();
uart_printf(" %d us => %d us\n", d, difftime(t0, t1));
uart_flush_output();
}
uart_printf("Done.\n");
/* sleep forever */
task_wait_msg(-1);
return EC_SUCCESS;
}
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