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/* Copyright 2016 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.
*/
#include "common.h"
#include "cts_common.h"
#include "gpio.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "watchdog.h"
/*
* Interrupt handler
*
* DUT is supposed to trigger an interrupt when it's done counting down,
* causing this function to be invoked.
*/
void cts_irq(enum gpio_signal signal)
{
/* Wake up the CTS task */
task_wake(TASK_ID_CTS);
}
static enum cts_rc timer_calibration_test(void)
{
/* Error margin: +/-2 msec (0.2% for one second) */
const int32_t margin = 2 * MSEC;
int32_t elapsed, delta;
timestamp_t t0, t1;
gpio_enable_interrupt(GPIO_CTS_NOTIFY);
interrupt_enable();
sync();
t0 = get_time();
/* Wait for interrupt */
task_wait_event(-1);
t1 = get_time();
elapsed = (int32_t)(t1.val - t0.val);
delta = elapsed - SECOND;
if (delta < -margin) {
CPRINTS("DUT clock runs too fast: %+d usec", delta);
return CTS_RC_FAILURE;
}
if (margin < delta) {
CPRINTS("DUT clock runs too slow: %+d usec", delta);
return CTS_RC_FAILURE;
}
return CTS_RC_SUCCESS;
}
#include "cts_testlist.h"
void cts_task(void)
{
cts_main_loop(tests, "Timer");
task_wait_event(-1);
}
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