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