78 lines
3.0 KiB
Python
Executable File
78 lines
3.0 KiB
Python
Executable File
# Copyright (c) 2023 Intel Corporation
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#
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# SPDX-License-Identifier: Apache-2.0
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import logging
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from math import ceil
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from twister_harness import DeviceAdapter
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logger = logging.getLogger(__name__)
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def do_analysys(test, stats, config, sys_clock_hw_cycles_per_sec):
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logger.info('====================================================')
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logger.info(f'periodic timer behaviour using {test} mechanism:')
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test_period = int(config['TIMER_TEST_PERIOD'])
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test_samples = int(config['TIMER_TEST_SAMPLES'])
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seconds = (test_period * test_samples) / 1_000_000
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periods_sec = test_period / 1_000_000
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ticks_per_sec = int(config['SYS_CLOCK_TICKS_PER_SEC'])
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periods_tick = ceil(ticks_per_sec * periods_sec)
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expected_period = test_period * sys_clock_hw_cycles_per_sec / 1_000_000
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cyc_per_tick = sys_clock_hw_cycles_per_sec / ticks_per_sec
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expected_period_drift = ((periods_tick * cyc_per_tick - expected_period) /
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sys_clock_hw_cycles_per_sec * 1_000_000)
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expected_total_drift = expected_period_drift * test_samples / 1_000_000
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period_max_drift = (int(config['TIMER_EXTERNAL_TEST_PERIOD_MAX_DRIFT_PPM'])
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/ 1_000_000)
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min_bound = (test_period - period_max_drift * test_period +
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expected_period_drift) / 1_000_000
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max_bound = (test_period + period_max_drift * test_period +
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expected_period_drift) / 1_000_000
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max_stddev = int(config['TIMER_TEST_MAX_STDDEV']) / 1_000_000
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max_drift_ppm = int(config['TIMER_EXTERNAL_TEST_MAX_DRIFT_PPM'])
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time_diff = stats['total_time'] - seconds - expected_total_drift
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logger.info(f'min: {stats["min"] * 1_000_000:.6f} us')
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logger.info(f'max: {stats["max"] * 1_000_000:.6f} us')
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logger.info(f'mean: {stats["mean"] * 1_000_000:.6f} us')
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logger.info(f'variance: {stats["var"] * 1_000_000:.6f} us')
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logger.info(f'stddev: {stats["stddev"] * 1_000_000:.6f} us')
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logger.info(f'total time: {stats["total_time"] * 1_000_000:.6f} us')
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logger.info(f'expected drift: {seconds * max_drift_ppm} us')
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logger.info(f'real drift: {time_diff * 1_000_000:.6f} us')
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logger.info('====================================================')
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assert stats['stddev'] < max_stddev
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assert stats['min'] >= min_bound
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assert stats['max'] <= max_bound
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assert abs(time_diff) < seconds * max_drift_ppm / 1_000_000
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def wait_sync_point(dut: DeviceAdapter, point):
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dut.readlines_until(regex=f"===== {point} =====")
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def test_flash(dut: DeviceAdapter, tool, tool_options, config,
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sys_clock_hw_cycles_per_sec):
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tool = __import__(tool)
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test_period = int(config['TIMER_TEST_PERIOD'])
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test_samples = int(config['TIMER_TEST_SAMPLES'])
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seconds = (test_period * test_samples) / 1_000_000
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tests = ["builtin", "startdelay"]
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for test in tests:
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wait_sync_point(dut, test)
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stats = tool.run(seconds, tool_options)
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do_analysys(test, stats, config, sys_clock_hw_cycles_per_sec)
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