Greg Steiert / maxim_dev

Maxim mbed development library

Dependents:   sensomed

tools/host_tests/wait_us_auto.py@0:0e018d759a2a, 2016-11-08 (annotated)

Committer:
switches
Date:
Tue Nov 08 18:27:11 2016 +0000
Revision:
0:0e018d759a2a
Initial commit

Who changed what in which revision?

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switches 0:0e018d759a2a 1 """
switches 0:0e018d759a2a 2 mbed SDK
switches 0:0e018d759a2a 3 Copyright (c) 2011-2013 ARM Limited
switches 0:0e018d759a2a 4
switches 0:0e018d759a2a 5 Licensed under the Apache License, Version 2.0 (the "License");
switches 0:0e018d759a2a 6 you may not use this file except in compliance with the License.
switches 0:0e018d759a2a 7 You may obtain a copy of the License at
switches 0:0e018d759a2a 8
switches 0:0e018d759a2a 9 http://www.apache.org/licenses/LICENSE-2.0
switches 0:0e018d759a2a 10
switches 0:0e018d759a2a 11 Unless required by applicable law or agreed to in writing, software
switches 0:0e018d759a2a 12 distributed under the License is distributed on an "AS IS" BASIS,
switches 0:0e018d759a2a 13 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
switches 0:0e018d759a2a 14 See the License for the specific language governing permissions and
switches 0:0e018d759a2a 15 limitations under the License.
switches 0:0e018d759a2a 16 """
switches 0:0e018d759a2a 17
switches 0:0e018d759a2a 18 from time import time
switches 0:0e018d759a2a 19
switches 0:0e018d759a2a 20 class WaitusTest():
switches 0:0e018d759a2a 21 """ This test is reading single characters from stdio
switches 0:0e018d759a2a 22 and measures time between their occurrences.
switches 0:0e018d759a2a 23 """
switches 0:0e018d759a2a 24 TICK_LOOP_COUNTER = 13
switches 0:0e018d759a2a 25 TICK_LOOP_SUCCESSFUL_COUNTS = 10
switches 0:0e018d759a2a 26 DEVIATION = 0.10 # +/-10%
switches 0:0e018d759a2a 27
switches 0:0e018d759a2a 28 def test(self, selftest):
switches 0:0e018d759a2a 29 test_result = True
switches 0:0e018d759a2a 30 # First character to start test (to know after reset when test starts)
switches 0:0e018d759a2a 31 if selftest.mbed.set_serial_timeout(None) is None:
switches 0:0e018d759a2a 32 return selftest.RESULT_IO_SERIAL
switches 0:0e018d759a2a 33 c = selftest.mbed.serial_read(1)
switches 0:0e018d759a2a 34 if c is None:
switches 0:0e018d759a2a 35 return selftest.RESULT_IO_SERIAL
switches 0:0e018d759a2a 36 if c == '$': # target will printout TargetID e.g.: $$$$1040e649d5c09a09a3f6bc568adef61375c6
switches 0:0e018d759a2a 37 #Read additional 39 bytes of TargetID
switches 0:0e018d759a2a 38 if selftest.mbed.serial_read(39) is None:
switches 0:0e018d759a2a 39 return selftest.RESULT_IO_SERIAL
switches 0:0e018d759a2a 40 c = selftest.mbed.serial_read(1) # Re-read first 'tick'
switches 0:0e018d759a2a 41 if c is None:
switches 0:0e018d759a2a 42 return selftest.RESULT_IO_SERIAL
switches 0:0e018d759a2a 43 start_serial_pool = time()
switches 0:0e018d759a2a 44 start = time()
switches 0:0e018d759a2a 45
switches 0:0e018d759a2a 46 success_counter = 0
switches 0:0e018d759a2a 47
switches 0:0e018d759a2a 48 for i in range(0, self.TICK_LOOP_COUNTER):
switches 0:0e018d759a2a 49 c = selftest.mbed.serial_read(1)
switches 0:0e018d759a2a 50 if c is None:
switches 0:0e018d759a2a 51 return selftest.RESULT_IO_SERIAL
switches 0:0e018d759a2a 52 delta = time() - start
switches 0:0e018d759a2a 53 deviation = abs(delta - 1)
switches 0:0e018d759a2a 54 # Round values
switches 0:0e018d759a2a 55 delta = round(delta, 2)
switches 0:0e018d759a2a 56 deviation = round(deviation, 2)
switches 0:0e018d759a2a 57 # Check if time measurements are in given range
switches 0:0e018d759a2a 58 deviation_ok = True if delta > 0 and deviation <= self.DEVIATION else False
switches 0:0e018d759a2a 59 success_counter = success_counter+1 if deviation_ok else 0
switches 0:0e018d759a2a 60 msg = "OK" if deviation_ok else "FAIL"
switches 0:0e018d759a2a 61 selftest.notify("%s in %.2f sec (%.2f) [%s]"% (c, delta, deviation, msg))
switches 0:0e018d759a2a 62 start = time()
switches 0:0e018d759a2a 63 if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS:
switches 0:0e018d759a2a 64 break
switches 0:0e018d759a2a 65 measurement_time = time() - start_serial_pool
switches 0:0e018d759a2a 66 selftest.notify("Consecutive OK timer reads: %d"% success_counter)
switches 0:0e018d759a2a 67 selftest.notify("Completed in %.2f sec" % (measurement_time))
switches 0:0e018d759a2a 68 test_result = True if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS else False
switches 0:0e018d759a2a 69 return selftest.RESULT_SUCCESS if test_result else selftest.RESULT_FAILURE