mirror of https://github.com/ARMmbed/mbed-os.git
70 lines
2.8 KiB
Python
70 lines
2.8 KiB
Python
"""
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mbed SDK
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Copyright (c) 2011-2013 ARM Limited
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Licensed under the Apache License, Version 2.0 (the "License");
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you may 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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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT 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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from time import time
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class WaitusTest():
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""" This test is reading single characters from stdio
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and measures time between their occurrences.
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"""
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TICK_LOOP_COUNTER = 13
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TICK_LOOP_SUCCESSFUL_COUNTS = 10
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DEVIATION = 0.10 # +/-10%
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def test(self, selftest):
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test_result = True
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# First character to start test (to know after reset when test starts)
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if selftest.mbed.set_serial_timeout(None) is None:
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return selftest.RESULT_IO_SERIAL
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c = selftest.mbed.serial_read(1)
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if c is None:
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return selftest.RESULT_IO_SERIAL
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if c == '$': # target will printout TargetID e.g.: $$$$1040e649d5c09a09a3f6bc568adef61375c6
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#Read additional 39 bytes of TargetID
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if selftest.mbed.serial_read(39) is None:
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return selftest.RESULT_IO_SERIAL
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c = selftest.mbed.serial_read(1) # Re-read first 'tick'
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if c is None:
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return selftest.RESULT_IO_SERIAL
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start_serial_pool = time()
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start = time()
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success_counter = 0
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for i in range(0, self.TICK_LOOP_COUNTER):
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c = selftest.mbed.serial_read(1)
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if c is None:
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return selftest.RESULT_IO_SERIAL
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delta = time() - start
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deviation = abs(delta - 1)
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# Round values
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delta = round(delta, 2)
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deviation = round(deviation, 2)
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# Check if time measurements are in given range
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deviation_ok = True if delta > 0 and deviation <= self.DEVIATION else False
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success_counter = success_counter+1 if deviation_ok else 0
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msg = "OK" if deviation_ok else "FAIL"
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selftest.notify("%s in %.2f sec (%.2f) [%s]"% (c, delta, deviation, msg))
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start = time()
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if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS:
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break
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measurement_time = time() - start_serial_pool
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selftest.notify("Consecutive OK timer reads: %d"% success_counter)
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selftest.notify("Completed in %.2f sec" % (measurement_time))
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test_result = True if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS else False
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return selftest.RESULT_SUCCESS if test_result else selftest.RESULT_FAILURE
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