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Export latency to csv files

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Bertrand Songis 2019-07-05 10:15:42 +02:00
parent 4e07c42de3
commit e27c93e202
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GPG key ID: F189F79290FEC50F
1 changed files with 41 additions and 22 deletions
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63
tools/latency.py
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@ -102,28 +102,43 @@ class SBusFrame:
return result
def print_statistics(trigger_transitions, sbus_frames, highval, lowval):
mini, maxi = None, None
count = 0
total = 0
for t0, val in trigger_transitions[1:]:
byte = highval if val == 1 else lowval
for frame in sbus_frames:
if frame.is_after(t0) and frame.byte(1) == byte:
delay = frame.end() - t0
count += 1
total += delay
if mini is None or delay < mini[0]:
mini = (delay, t0, frame, val, byte)
if maxi is None or delay > maxi[0]:
maxi = (delay, t0, frame)
break
class LatencyStatistics:
def __init__(self, trigger_transitions, sbus_frames, highval, lowval):
self.trigger_transitions = trigger_transitions
self.sbus_frames = sbus_frames
self.highval = highval
self.lowval = lowval
print("Delay between the switch toggle and the end of the SBUS frame:")
print(" Count = %d transitions" % count)
print(" Average = %.1fms" % (total / count))
print(" Mini = %.1fms @ %fs" % (mini[0], mini[1] / 1000))
print(" Maxi = %.1fms @ %fs" % (maxi[0], maxi[1] / 1000))
def iter(self):
for t0, val in self.trigger_transitions[1:]:
byte = self.highval if val == 1 else self.lowval
for frame in self.sbus_frames:
if frame.is_after(t0) and frame.byte(1) == byte:
delay = frame.end() - t0
yield (t0, val, frame, delay)
break
def export(self, f):
for t0, val, frame, delay in self.iter():
f.write("%f\n" % delay)
def print(self):
mini, maxi = None, None
count = 0
total = 0
for t0, val, frame, delay in self.iter():
count += 1
total += delay
if mini is None or delay < mini[0]:
mini = (delay, t0, frame)
if maxi is None or delay > maxi[0]:
maxi = (delay, t0, frame)
print("Delay between the switch toggle and the end of the SBUS frame:")
print(" Count = %d transitions" % count)
print(" Average = %.1fms" % (total / count))
print(" Mini = %.1fms @ %fs" % (mini[0], mini[1] / 1000))
print(" Maxi = %.1fms @ %fs" % (maxi[0], maxi[1] / 1000))
def main():
@ -134,6 +149,7 @@ def main():
parser.add_argument('--sbus', help='The column in the csv file where is your SBUS output', type=int)
parser.add_argument('--highval', help='The value of SBUS byte 2 when trigger=HIGH', type=int, default=0x13)
parser.add_argument('--lowval', help='The value of SBUS byte 2 when trigger=LOW', type=int, default=0xAC)
parser.add_argument('--export', help='CSV file to export latency values', type=argparse.FileType('w'))
args = parser.parse_args()
if not args.pwm and not args.sbus:
print("Either a PWM or SBUS column in CSV must be specified")
@ -147,7 +163,10 @@ def main():
if frame.is_lost():
print("Frame lost bit @ %fs" % frame.start())
print_statistics(trigger_transitions, sbus_frames, args.highval, args.lowval)
statistics = LatencyStatistics(trigger_transitions, sbus_frames, args.highval, args.lowval)
if args.export:
statistics.export(args.export)
statistics.print()
if __name__ == "__main__":