2020-05-18 18:31:27 +00:00
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# NanoVNASaver
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2020-06-25 17:48:03 +00:00
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#
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2020-05-18 18:31:27 +00:00
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# A python program to view and export Touchstone data from a NanoVNA
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2020-06-25 17:52:30 +00:00
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# Copyright (C) 2019, 2020 Rune B. Broberg
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2020-06-25 17:48:03 +00:00
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# Copyright (C) 2020 NanoVNA-Saver Authors
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2020-05-16 15:10:07 +00:00
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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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2020-07-15 12:47:06 +00:00
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from collections import OrderedDict
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2020-05-16 15:10:07 +00:00
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from time import sleep
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2020-07-07 14:48:43 +00:00
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from typing import List, Iterator
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2020-05-16 15:10:07 +00:00
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2020-07-04 10:08:54 +00:00
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from PyQt5 import QtGui
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2020-05-16 15:10:07 +00:00
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2020-07-25 18:10:24 +00:00
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from NanoVNASaver.Version import Version
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2020-07-04 10:08:54 +00:00
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from NanoVNASaver.Hardware.Serial import Interface, drain_serial
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2020-06-25 17:48:03 +00:00
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2020-05-16 15:10:07 +00:00
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logger = logging.getLogger(__name__)
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2020-07-15 12:47:06 +00:00
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DISLORD_BW = OrderedDict((
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(10, 181),
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(33, 58),
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(100, 19),
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(333, 5),
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(1000, 1),
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(2000, 0),
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))
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2020-07-24 19:11:34 +00:00
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WAIT = 0.05
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2020-05-16 15:10:07 +00:00
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2020-07-14 09:30:28 +00:00
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def _max_retries(bandwidth: int, datapoints: int) -> int:
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2020-08-03 15:31:00 +00:00
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return round(20 + 20 * (datapoints / 101) +
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(1000 / bandwidth) ** 1.30 * (datapoints / 101))
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2020-07-14 09:30:28 +00:00
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class VNA:
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name = "VNA"
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2020-07-30 07:28:57 +00:00
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valid_datapoints = (101, 51, 11)
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wait = 0.05
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def __init__(self, iface: Interface):
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self.serial = iface
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2020-07-04 12:26:20 +00:00
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self.version = Version("0.0.0")
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2020-06-10 10:28:51 +00:00
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self.features = set()
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2020-07-28 15:34:16 +00:00
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self.validateInput = False
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2020-07-07 10:33:32 +00:00
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self.datapoints = self.valid_datapoints[0]
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self.bandwidth = 1000
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self.bw_method = "ttrftech"
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2021-04-03 14:48:48 +00:00
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self.sweep_max_freq_Hz = None
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2021-04-06 09:05:13 +00:00
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# [((min_freq, max_freq), [description]]. Order by increasing
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# frequency. Put default output power first.
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self.txPowerRanges = []
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2020-07-07 14:48:43 +00:00
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if self.connected():
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self.version = self.readVersion()
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self.read_features()
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logger.debug("Features: %s", self.features)
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# cannot read current bandwidth, so set to highest
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# to get initial sweep fast
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if "Bandwidth" in self.features:
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self.set_bandwidth(self.get_bandwidths()[-1])
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2020-07-24 19:11:34 +00:00
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def connect(self):
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logger.info("connect %s", self.serial)
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with self.serial.lock:
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self.serial.open()
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def disconnect(self):
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logger.info("disconnect %s", self.serial)
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with self.serial.lock:
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self.serial.close()
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def reconnect(self):
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self.disconnect()
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sleep(WAIT)
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self.connect()
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sleep(WAIT)
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def exec_command(self, command: str, wait: float = WAIT) -> Iterator[str]:
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logger.debug("exec_command(%s)", command)
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with self.serial.lock:
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drain_serial(self.serial)
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self.serial.write(f"{command}\r".encode('ascii'))
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sleep(wait)
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retries = 0
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max_retries = _max_retries(self.bandwidth, self.datapoints)
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logger.debug("Max retries: %s", max_retries)
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while True:
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line = self.serial.readline()
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line = line.decode("ascii").strip()
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if not line:
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retries += 1
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if retries > max_retries:
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raise IOError("too many retries")
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2020-07-12 22:09:00 +00:00
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sleep(wait)
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continue
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if line == command: # suppress echo
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continue
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if line.startswith("ch>"):
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logger.debug("Needed retries: %s", retries)
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break
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yield line
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def read_features(self):
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result = " ".join(self.exec_command("help")).split()
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logger.debug("result:\n%s", result)
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if "capture" in result:
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self.features.add("Screenshots")
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if "bandwidth" in result:
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self.features.add("Bandwidth")
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result = " ".join(list(self.exec_command("bandwidth")))
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if "Hz)" in result:
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self.bw_method = "dislord"
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2020-07-07 10:33:32 +00:00
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if len(self.valid_datapoints) > 1:
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2020-06-17 17:36:06 +00:00
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self.features.add("Customizable data points")
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def get_bandwidths(self) -> List[int]:
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logger.debug("get bandwidths")
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if self.bw_method == "dislord":
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return list(DISLORD_BW.keys())
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result = " ".join(list(self.exec_command("bandwidth")))
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try:
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result = result.split(" {")[1].strip("}")
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return sorted([int(i) for i in result.split("|")])
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except IndexError:
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return [1000, ]
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def set_bandwidth(self, bandwidth: int):
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bw_val = bandwidth
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if self.bw_method == "dislord":
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bw_val = DISLORD_BW[bandwidth]
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result = " ".join(self.exec_command(f"bandwidth {bw_val}"))
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if self.bw_method == "ttrftech" and result:
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raise IOError(f"set_bandwith({bandwidth}: {result}")
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self.bandwidth = bandwidth
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2020-06-14 07:19:28 +00:00
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def readFrequencies(self) -> List[int]:
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return [int(f) for f in self.readValues("frequencies")]
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def resetSweep(self, start: int, stop: int):
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pass
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2020-12-23 15:15:08 +00:00
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def _get_running_frequencies(self):
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'''
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If possible, read frequencies already runnung
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if not return default values
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Overwrite in specific HW
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'''
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return 27000000, 30000000
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2020-07-05 11:00:03 +00:00
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def connected(self) -> bool:
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return self.serial.is_open
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2020-05-16 15:10:07 +00:00
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def getFeatures(self) -> List[str]:
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return self.features
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def getCalibration(self) -> str:
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return " ".join(list(self.exec_command("cal")))
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def getScreenshot(self) -> QtGui.QPixmap:
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return QtGui.QPixmap()
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def flushSerialBuffers(self):
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if not self.connected():
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return
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with self.serial.lock:
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2020-07-01 17:46:35 +00:00
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self.serial.write("\r\n\r\n".encode("ascii"))
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2020-05-16 15:10:07 +00:00
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sleep(0.1)
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self.serial.reset_input_buffer()
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self.serial.reset_output_buffer()
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sleep(0.1)
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def readFirmware(self) -> str:
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2020-07-07 14:48:43 +00:00
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result = "\n".join(list(self.exec_command("info")))
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logger.debug("result:\n%s", result)
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return result
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def readValues(self, value) -> List[str]:
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logger.debug("VNA reading %s", value)
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result = list(self.exec_command(value))
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logger.debug("VNA done reading %s (%d values)",
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value, len(result))
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return result
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2020-07-08 13:45:33 +00:00
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def readVersion(self) -> 'Version':
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result = list(self.exec_command("version"))
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logger.debug("result:\n%s", result)
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return Version(result[0])
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def setSweep(self, start, stop):
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list(self.exec_command(f"sweep {start} {stop} {self.datapoints}"))
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2021-04-06 09:05:13 +00:00
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def setTXPower(self, freq_range, power_desc):
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raise NotImplementedError()
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