kopia lustrzana https://github.com/NanoVNA-Saver/nanovna-saver
131 wiersze
3.9 KiB
Python
131 wiersze
3.9 KiB
Python
# NanoVNASaver
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#
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# A python program to view and export Touchstone data from a NanoVNA
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# Copyright (C) 2019, 2020 Rune B. Broberg
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# Copyright (C) 2020,2021 NanoVNA-Saver Authors
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import logging
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from enum import Enum
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from math import log
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from threading import Lock
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from typing import Iterator, Tuple
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logger = logging.getLogger(__name__)
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class SweepMode(Enum):
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SINGLE = 0
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CONTINOUS = 1
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AVERAGE = 2
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class Properties:
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def __init__(
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self,
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name: str = "",
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mode: "SweepMode" = SweepMode.SINGLE,
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averages: Tuple[int, int] = (3, 0),
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logarithmic: bool = False,
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):
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self.name = name
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self.mode = mode
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self.averages = averages
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self.logarithmic = logarithmic
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def __repr__(self):
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return (
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f"Properties('{self.name}', {self.mode}, {self.averages},"
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f" {self.logarithmic})"
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)
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class Sweep:
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def __init__(
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self,
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start: int = 3600000,
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end: int = 30000000,
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points: int = 101,
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segments: int = 1,
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properties: "Properties" = Properties(),
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):
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self.start = start
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self.end = end
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self.points = points
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self.segments = segments
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self.properties = properties
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self.lock = Lock()
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self.check()
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logger.debug("%s", self)
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def __repr__(self) -> str:
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return (
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f"Sweep({self.start}, {self.end}, {self.points}, {self.segments},"
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f" {self.properties})"
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)
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def __eq__(self, other) -> bool:
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return (
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self.start == other.start
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and self.end == other.end
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and self.points == other.points
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and self.segments == other.segments
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and self.properties == other.properties
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)
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def copy(self) -> "Sweep":
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return Sweep(
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self.start, self.end, self.points, self.segments, self.properties
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)
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@property
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def span(self) -> int:
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return self.end - self.start
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@property
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def stepsize(self) -> int:
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return round(self.span / (self.points * self.segments - 1))
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def check(self):
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if (
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self.segments <= 0
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or self.points <= 0
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or self.start < 0
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or self.end <= 0
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or self.stepsize < 1
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):
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raise ValueError(f"Illegal sweep settings: {self}")
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def _exp_factor(self, index: int) -> float:
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return 1 - log(self.segments + 1 - index) / log(self.segments + 1)
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def get_index_range(self, index: int) -> Tuple[int, int]:
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if not self.properties.logarithmic:
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start = self.start + index * self.points * self.stepsize
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end = start + (self.points - 1) * self.stepsize
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else:
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start = round(self.start + self.span * self._exp_factor(index))
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end = round(self.start + self.span * self._exp_factor(index + 1))
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logger.debug("get_index_range(%s) -> (%s, %s)", index, start, end)
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return start, end
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def get_frequencies(self) -> Iterator[int]:
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for i in range(self.segments):
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start, stop = self.get_index_range(i)
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step = (stop - start) / self.points
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freq = start
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for _ in range(self.points):
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yield round(freq)
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freq += step
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