5.2.1 - Updated I2C files
Dependents: mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510
TESTS/host_tests/timing_drift_auto.py
- Committer:
- group-onsemi
- Date:
- 2017-01-25
- Revision:
- 0:098463de4c5d
File content as of revision 0:098463de4c5d:
""" mbed SDK Copyright (c) 2011-2013 ARM Limited Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. """ from mbed_host_tests import BaseHostTest class TimingDriftTest(BaseHostTest): """ This test is reading single characters from stdio and measures time between their occurrences. """ __result = None # This is calculated later: average_drift_max * number of tick events total_drift_max = None average_drift_max = 0.05 ticks = [] start_time = None finish_time = None dut_seconds_passed = None total_time = None total_drift = None average_drift = None def _callback_result(self, key, value, timestamp): # We should not see result data in this test self.__result = False def _callback_end(self, key, value, timestamp): """ {{end;%s}}} """ self.log("Received end event, timestamp: %f" % timestamp) self.notify_complete(result=self.result(print_stats=True)) def _callback_tick(self, key, value, timestamp): """ {{tick;%d}}} """ self.log("tick! %f" % timestamp) self.ticks.append((key, value, timestamp)) def setup(self): self.register_callback("end", self._callback_end) self.register_callback('tick', self._callback_tick) def result(self, print_stats=True): self.dut_seconds_passed = len(self.ticks) - 1 if self.dut_seconds_passed < 1: if print_stats: self.log("FAIL: failed to receive at least two tick events") self.__result = False return self.__result self.total_drift_max = self.dut_seconds_passed * self.average_drift_max self.start_time = self.ticks[0][2] self.finish_time = self.ticks[-1][2] self.total_time = self.finish_time - self.start_time self.total_drift = self.total_time - self.dut_seconds_passed self.average_drift = self.total_drift / self.dut_seconds_passed if print_stats: self.log("Start: %f" % self.start_time) self.log("Finish: %f" % self.finish_time) self.log("Total time taken: %f" % self.total_time) total_drift_ratio_string = "Total drift/Max total drift: %f/%f" self.log(total_drift_ratio_string % (self.total_drift, self.total_drift_max)) average_drift_ratio_string = "Average drift/Max average drift: %f/%f" self.log(average_drift_ratio_string % (self.average_drift, self.average_drift_max)) if abs(self.total_drift) > self.total_drift_max: if print_stats: self.log("FAIL: Total drift exceeded max total drift") self.__result = False elif self.average_drift > self.average_drift_max: if print_stats: self.log("FAIL: Average drift exceeded max average drift") self.__result = False else: self.__result = True return self.__result def teardown(self): pass