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https://github.com/Telecominfraproject/OpenCellular.git
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e24fa592d2
source files mainly done by Vincent. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> Change-Id: Ic2d1becd400c9b4b4a14d4a243af1bdf77d9c1e2
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/* Copyright (c) 2011 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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* Copyright 2011 Google Inc.
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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 "uart.h"
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#include "task.h"
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#include "timer.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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uart_printf("\n=== Timer calibration ===\n");
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t0 = get_time();
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t1 = get_time();
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uart_printf("- back-to-back get_time : %d us\n", difftime(t0, t1));
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/* Sleep for 5 seconds */
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uart_printf("- sleep 1s :\n ");
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uart_flush_output();
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uart_printf("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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uart_printf("done. delay = %d us\n", difftime(t0, t1));
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/* try small usleep */
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uart_printf("- short sleep :\n");
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uart_flush_output();
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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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uart_printf(" %d us => %d us\n", d, difftime(t0, t1));
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uart_flush_output();
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}
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uart_printf("Done.\n");
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/* sleep forever */
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task_wait_msg(-1);
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return EC_SUCCESS;
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}
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