takashi kadono / Mbed OS Nucleo446_SSD1331

Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466

Dependencies:   ssd1331

mbed-os/TESTS/host_tests/timing_drift_auto.py@3:f3764f852aa8, 2018-10-11 (annotated)

Committer:
kadonotakashi
Date:
Thu Oct 11 02:27:46 2018 +0000
Revision:
3:f3764f852aa8
Parent:
0:8fdf9a60065b 
Nucreo 446 + SSD1331 test version;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadonotakashi 0:8fdf9a60065b 1 """
kadonotakashi 0:8fdf9a60065b 2 mbed SDK
kadonotakashi 0:8fdf9a60065b 3 Copyright (c) 2011-2013 ARM Limited
kadonotakashi 0:8fdf9a60065b 4
kadonotakashi 0:8fdf9a60065b 5 Licensed under the Apache License, Version 2.0 (the "License");
kadonotakashi 0:8fdf9a60065b 6 you may not use this file except in compliance with the License.
kadonotakashi 0:8fdf9a60065b 7 You may obtain a copy of the License at
kadonotakashi 0:8fdf9a60065b 8
kadonotakashi 0:8fdf9a60065b 9 http://www.apache.org/licenses/LICENSE-2.0
kadonotakashi 0:8fdf9a60065b 10
kadonotakashi 0:8fdf9a60065b 11 Unless required by applicable law or agreed to in writing, software
kadonotakashi 0:8fdf9a60065b 12 distributed under the License is distributed on an "AS IS" BASIS,
kadonotakashi 0:8fdf9a60065b 13 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kadonotakashi 0:8fdf9a60065b 14 See the License for the specific language governing permissions and
kadonotakashi 0:8fdf9a60065b 15 limitations under the License.
kadonotakashi 0:8fdf9a60065b 16 """
kadonotakashi 0:8fdf9a60065b 17
kadonotakashi 0:8fdf9a60065b 18 from mbed_host_tests import BaseHostTest
kadonotakashi 0:8fdf9a60065b 19 import time
kadonotakashi 0:8fdf9a60065b 20
kadonotakashi 0:8fdf9a60065b 21
kadonotakashi 0:8fdf9a60065b 22 class TimingDriftSync(BaseHostTest):
kadonotakashi 0:8fdf9a60065b 23 """
kadonotakashi 0:8fdf9a60065b 24 This works as master-slave fashion
kadonotakashi 0:8fdf9a60065b 25 1) Device says its booted up and ready to run the test, wait for host to respond
kadonotakashi 0:8fdf9a60065b 26 2) Host sends the message to get the device current time i.e base time
kadonotakashi 0:8fdf9a60065b 27
kadonotakashi 0:8fdf9a60065b 28 #
kadonotakashi 0:8fdf9a60065b 29 # *
kadonotakashi 0:8fdf9a60065b 30 # * |
kadonotakashi 0:8fdf9a60065b 31 #<---* DUT<- base_time | - round_trip_base_time ------
kadonotakashi 0:8fdf9a60065b 32 # * | |
kadonotakashi 0:8fdf9a60065b 33 # * - |
kadonotakashi 0:8fdf9a60065b 34 # - |
kadonotakashi 0:8fdf9a60065b 35 # | |
kadonotakashi 0:8fdf9a60065b 36 # | |
kadonotakashi 0:8fdf9a60065b 37 # | - measurement_stretch | - nominal_time
kadonotakashi 0:8fdf9a60065b 38 # | |
kadonotakashi 0:8fdf9a60065b 39 # | |
kadonotakashi 0:8fdf9a60065b 40 # - |
kadonotakashi 0:8fdf9a60065b 41 # * - |
kadonotakashi 0:8fdf9a60065b 42 # * | |
kadonotakashi 0:8fdf9a60065b 43 #<---* DUT <-final_time | - round_trip_final_time------
kadonotakashi 0:8fdf9a60065b 44 # * |
kadonotakashi 0:8fdf9a60065b 45 # * -
kadonotakashi 0:8fdf9a60065b 46 #
kadonotakashi 0:8fdf9a60065b 47 #
kadonotakashi 0:8fdf9a60065b 48 # As we increase the measurement_stretch, the error because of transport delay diminishes.
kadonotakashi 0:8fdf9a60065b 49 # The values of measurement_stretch is propotional to round_trip_base_time(transport delays)
kadonotakashi 0:8fdf9a60065b 50 # by factor time_measurement_multiplier.This multiplier is used is 80 to tolerate 2 sec of
kadonotakashi 0:8fdf9a60065b 51 # transport delay and test time ~ 180 secs
kadonotakashi 0:8fdf9a60065b 52 #
kadonotakashi 0:8fdf9a60065b 53 # Failure in timing can occur if we are ticking too fast or we are ticking too slow, hence we have
kadonotakashi 0:8fdf9a60065b 54 # min_range and max_range. if we cross on either side tests would be marked fail. The range is a function of
kadonotakashi 0:8fdf9a60065b 55 # tolerance/acceptable drift currently its 5%.
kadonotakashi 0:8fdf9a60065b 56 #
kadonotakashi 0:8fdf9a60065b 57
kadonotakashi 0:8fdf9a60065b 58 """
kadonotakashi 0:8fdf9a60065b 59 __result = None
kadonotakashi 0:8fdf9a60065b 60 mega = 1000000.0
kadonotakashi 0:8fdf9a60065b 61 max_measurement_time = 180
kadonotakashi 0:8fdf9a60065b 62
kadonotakashi 0:8fdf9a60065b 63 # this value is obtained for measurements when there is 0 transport delay and we want accurancy of 5%
kadonotakashi 0:8fdf9a60065b 64 time_measurement_multiplier = 80
kadonotakashi 0:8fdf9a60065b 65
kadonotakashi 0:8fdf9a60065b 66 def _callback_timing_drift_check_start(self, key, value, timestamp):
kadonotakashi 0:8fdf9a60065b 67 self.round_trip_base_start = timestamp
kadonotakashi 0:8fdf9a60065b 68 self.send_kv("base_time", 0)
kadonotakashi 0:8fdf9a60065b 69
kadonotakashi 0:8fdf9a60065b 70 def _callback_base_time(self, key, value, timestamp):
kadonotakashi 0:8fdf9a60065b 71 self.round_trip_base_end = timestamp
kadonotakashi 0:8fdf9a60065b 72 self.device_time_base = float(value)
kadonotakashi 0:8fdf9a60065b 73 self.round_trip_base_time = self.round_trip_base_end - self.round_trip_base_start
kadonotakashi 0:8fdf9a60065b 74
kadonotakashi 0:8fdf9a60065b 75 self.log("Device base time {}".format(value))
kadonotakashi 0:8fdf9a60065b 76 measurement_stretch = (self.round_trip_base_time * self.time_measurement_multiplier) + 5
kadonotakashi 0:8fdf9a60065b 77
kadonotakashi 0:8fdf9a60065b 78 if measurement_stretch > self.max_measurement_time:
kadonotakashi 0:8fdf9a60065b 79 self.log("Time required {} to determine device timer is too high due to transport delay, skipping".format(measurement_stretch))
kadonotakashi 0:8fdf9a60065b 80 else:
kadonotakashi 0:8fdf9a60065b 81 self.log("sleeping for {} to measure drift accurately".format(measurement_stretch))
kadonotakashi 0:8fdf9a60065b 82 time.sleep(measurement_stretch)
kadonotakashi 0:8fdf9a60065b 83 self.round_trip_final_start = time.time()
kadonotakashi 0:8fdf9a60065b 84 self.send_kv("final_time", 0)
kadonotakashi 0:8fdf9a60065b 85
kadonotakashi 0:8fdf9a60065b 86 def _callback_final_time(self, key, value, timestamp):
kadonotakashi 0:8fdf9a60065b 87 self.round_trip_final_end = timestamp
kadonotakashi 0:8fdf9a60065b 88 self.device_time_final = float(value)
kadonotakashi 0:8fdf9a60065b 89 self.round_trip_final_time = self.round_trip_final_end - self.round_trip_final_start
kadonotakashi 0:8fdf9a60065b 90 self.log("Device final time {} ".format(value))
kadonotakashi 0:8fdf9a60065b 91
kadonotakashi 0:8fdf9a60065b 92 # compute the test results and send to device
kadonotakashi 0:8fdf9a60065b 93 results = "pass" if self.compute_parameter() else "fail"
kadonotakashi 0:8fdf9a60065b 94 self.send_kv(results, "0")
kadonotakashi 0:8fdf9a60065b 95
kadonotakashi 0:8fdf9a60065b 96 def setup(self):
kadonotakashi 0:8fdf9a60065b 97 self.register_callback('timing_drift_check_start', self._callback_timing_drift_check_start)
kadonotakashi 0:8fdf9a60065b 98 self.register_callback('base_time', self._callback_base_time)
kadonotakashi 0:8fdf9a60065b 99 self.register_callback('final_time', self._callback_final_time)
kadonotakashi 0:8fdf9a60065b 100
kadonotakashi 0:8fdf9a60065b 101 def compute_parameter(self, failure_criteria=0.05):
kadonotakashi 0:8fdf9a60065b 102 t_max = self.round_trip_final_end - self.round_trip_base_start
kadonotakashi 0:8fdf9a60065b 103 t_min = self.round_trip_final_start - self.round_trip_base_end
kadonotakashi 0:8fdf9a60065b 104 t_max_hi = t_max * (1 + failure_criteria)
kadonotakashi 0:8fdf9a60065b 105 t_max_lo = t_max * (1 - failure_criteria)
kadonotakashi 0:8fdf9a60065b 106 t_min_hi = t_min * (1 + failure_criteria)
kadonotakashi 0:8fdf9a60065b 107 t_min_lo = t_min * (1 - failure_criteria)
kadonotakashi 0:8fdf9a60065b 108 device_time = (self.device_time_final - self.device_time_base) / self.mega
kadonotakashi 0:8fdf9a60065b 109
kadonotakashi 0:8fdf9a60065b 110 self.log("Compute host events")
kadonotakashi 0:8fdf9a60065b 111 self.log("Transport delay 0: {}".format(self.round_trip_base_time))
kadonotakashi 0:8fdf9a60065b 112 self.log("Transport delay 1: {}".format(self.round_trip_final_time))
kadonotakashi 0:8fdf9a60065b 113 self.log("DUT base time : {}".format(self.device_time_base))
kadonotakashi 0:8fdf9a60065b 114 self.log("DUT end time : {}".format(self.device_time_final))
kadonotakashi 0:8fdf9a60065b 115
kadonotakashi 0:8fdf9a60065b 116 self.log("min_pass : {} , max_pass : {} for {}%%".format(t_max_lo, t_min_hi, failure_criteria * 100))
kadonotakashi 0:8fdf9a60065b 117 self.log("min_inconclusive : {} , max_inconclusive : {}".format(t_min_lo, t_max_hi))
kadonotakashi 0:8fdf9a60065b 118 self.log("Time reported by device: {}".format(device_time))
kadonotakashi 0:8fdf9a60065b 119
kadonotakashi 0:8fdf9a60065b 120 if t_max_lo <= device_time <= t_min_hi:
kadonotakashi 0:8fdf9a60065b 121 self.log("Test passed !!!")
kadonotakashi 0:8fdf9a60065b 122 self.__result = True
kadonotakashi 0:8fdf9a60065b 123 elif t_min_lo <= device_time <= t_max_hi:
kadonotakashi 0:8fdf9a60065b 124 self.log("Test inconclusive due to transport delay, retrying")
kadonotakashi 0:8fdf9a60065b 125 self.__result = False
kadonotakashi 0:8fdf9a60065b 126 else:
kadonotakashi 0:8fdf9a60065b 127 self.log("Time outside of passing range. Timing drift seems to be present !!!")
kadonotakashi 0:8fdf9a60065b 128 self.__result = False
kadonotakashi 0:8fdf9a60065b 129 return self.__result
kadonotakashi 0:8fdf9a60065b 130
kadonotakashi 0:8fdf9a60065b 131 def result(self):
kadonotakashi 0:8fdf9a60065b 132 return self.__result
kadonotakashi 0:8fdf9a60065b 133
kadonotakashi 0:8fdf9a60065b 134 def teardown(self):
kadonotakashi 0:8fdf9a60065b 135 pass