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Update timing calculations

pull/4599/head
Russ Butler 2017-06-28 16:29:38 -05:00
parent 73907259d9
commit f535cb5ddc
1 changed files with 13 additions and 18 deletions
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31
TESTS/host_tests/timing_drift_auto.py
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@ -99,37 +99,32 @@ class TimingDriftSync(BaseHostTest):
self.register_callback('final_time', self._callback_final_time)
def compute_parameter(self, failure_criteria=0.05):
nominal_time = (self.round_trip_final_start + self.round_trip_final_end) / 2.0 - (self.round_trip_base_start + self.round_trip_base_end) / 2.0
transport_error = self.round_trip_final_time / 2.0 + self.round_trip_base_time / 2.0
min_range = nominal_time * (1 - failure_criteria)
max_range = nominal_time * (1 + failure_criteria)
t_max = self.round_trip_final_end - self.round_trip_base_start
t_min = self.round_trip_final_start - self.round_trip_base_end
t_max_hi = t_max * (1 + failure_criteria)
t_max_lo = t_max * (1 - failure_criteria)
t_min_hi = t_min * (1 + failure_criteria)
t_min_lo = t_min * (1 - failure_criteria)
device_time = (self.device_time_final - self.device_time_base) / self.mega
min_pass_value = (device_time - transport_error)
max_pass_value = (device_time + transport_error)
self.log("Compute host events")
self.log("Transport delay 0: {}".format(self.round_trip_base_time))
self.log("Transport delay 1: {}".format(self.round_trip_final_time))
self.log("Transport dealy avg : {} ".format(transport_error))
self.log("DUT base time : {}".format(self.device_time_base))
self.log("DUT end time : {}".format(self.device_time_final))
self.log("Actual Time : {}".format(device_time))
self.log("Nominal Time : {}".format(nominal_time))
self.log("min_pass : {} , max_pass : {}".format(min_pass_value, max_pass_value))
self.log("min_range : {} , max_range : {}".format(min_range, max_range))
self.log("min_pass : {} , max_pass : {} for {}%%".format(t_max_lo, t_min_hi, failure_criteria * 100))
self.log("min_inconclusive : {} , max_inconclusive : {}".format(t_min_lo, t_max_hi))
self.log("Time reported by device: {}".format(device_time))
if (min_pass_value >= min_range) and (max_pass_value <= max_range):
if t_max_lo <= device_time <= t_min_hi:
self.log("Test passed !!!")
self.__result = True
elif (min_pass_value > max_range) or (max_pass_value < min_pass_value):
self.log("Time outside of passing range. Timing drift seems to be present !!!")
elif t_min_lo <= device_time <= t_max_hi:
self.log("Test inconclusive due to transport delay, retrying")
self.__result = False
else:
self.log("Test inconclusive due to transport delay, retrying")
self.log("Time outside of passing range. Timing drift seems to be present !!!")
self.__result = False
return self.__result