mirror of https://github.com/ARMmbed/mbed-os.git
102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
/*
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* Copyright (c) 2018, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbed.h"
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#include "greentea-client/test_env.h"
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#include "unity.h"
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#include "utest.h"
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#include "platform/mbed_wait_api.h"
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#include "hal/us_ticker_api.h"
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#include "hal/lp_ticker_api.h"
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//FastModels not support timing test
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#if defined(__ARM_FM)
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#error [NOT_SUPPORTED] test not supported
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#endif
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using namespace utest::v1;
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/* This test is created based on the test for Timer class.
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* Since low power timer is less accurate than regular
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* timer we need to adjust delta.
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*/
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/*
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* Define tolerance as follows:
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* Timer might be +/-5% out; wait_ns is permitted 40% slow, but not fast.
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* Therefore minimum measured time should be 95% of requested, maximum should
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* be 145%. Unity doesn't let us specify an asymmetric error though.
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*
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* Would be nice to have tighter upper tolerance, but in practice we've seen
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* a few devices unable to sustain theoretical throughput - flash wait states?
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*/
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#define TOLERANCE_MIN 0.95f
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#define TOLERANCE_MAX 1.45f
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#define MIDPOINT ((TOLERANCE_MIN+TOLERANCE_MAX)/2)
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#define DELTA (MIDPOINT-TOLERANCE_MIN)
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/* This test verifies if wait_ns's wait time
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* is accurate, according to a timer.
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*
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* Given timer is created.
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* When timer is used to measure delay.
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* Then the results are valid (within acceptable range).
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*/
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template<int wait_val_ms, class CompareTimer>
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void test_wait_ns_time_measurement()
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{
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CompareTimer timer;
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float wait_val_s = (float)wait_val_ms / 1000;
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/* Start the timer. */
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timer.start();
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/* Wait <wait_val_ms> ms - arithmetic inside wait_ns will overflow if
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* asked for too large a delay, so break it up.
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*/
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for (int i = 0; i < wait_val_ms; i++) {
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wait_ns(1000000);
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}
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/* Stop the timer. */
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timer.stop();
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/* Check results - wait_val_us us have elapsed. */
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TEST_ASSERT_FLOAT_WITHIN(DELTA * wait_val_s, MIDPOINT * wait_val_s, timer.read());
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}
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utest::v1::status_t test_setup(const size_t number_of_cases)
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{
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GREENTEA_SETUP(15, "default_auto");
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return verbose_test_setup_handler(number_of_cases);
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}
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Case cases[] = {
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#if DEVICE_LPTICKER
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Case("Test: wait_ns - compare with lp_timer 1s", test_wait_ns_time_measurement<1000, LowPowerTimer>),
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#endif
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Case("Test: wait_ns - compare with us_timer 1s", test_wait_ns_time_measurement<1000, Timer>)
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};
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Specification specification(test_setup, cases);
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int main()
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{
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return !Harness::run(specification);
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}
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