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b517067a41
The timer test checks the accuracy of the internal timer. After sync, DUT and TH start counting down one second. After one second, DUT raises GPIO level. TH determines whether the test passes or not based on how much more or less time elapsed than one second, assuming its clock is calibrated. This test takes advantage of TH running on a bare chip. If the host were measuring (instead of TH), the timing would be affected by many software and hardware layers (e.g. UART drivers on DUT and host, python interpreter, etc.). BUG=chromium:624520 BRANCH=none TEST=cts.py --module timer && cts.py --module gpio && make buildall Change-Id: I535e7772b4d93f1f5d248506f7ea167429a50174 Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/361384
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
/* 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 "gpio.h"
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#include "registers.h"
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#include "task.h"
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#include "th_common.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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enum cts_rc rc;
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int i;
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for (i = 0; i < CTS_TEST_ID_COUNT; i++) {
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sync();
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rc = tests[i].run();
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CPRINTF("\n%s %d\n", tests[i].name, rc);
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cflush();
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}
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CPRINTS("Timer test suite finished");
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cflush();
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while (1) {
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watchdog_reload();
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sleep(1);
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}
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}
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