Custom version of https://github.com/tomelec/RPi-LoRa-KISS-TNC
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76 lines
3.7 KiB
76 lines
3.7 KiB
""" Defines LoRaArgumentParser which extends argparse.ArgumentParser with standard config parameters for the SX127x. """
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# -*- coding: utf-8 -*-
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# Copyright 2018 Mayer Analytics Ltd.
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#
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# This file is part of pySX127x.
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#
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# pySX127x is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public
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# License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
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# version.
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#
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# pySX127x is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You can be released from the requirements of the license by obtaining a commercial license. Such a license is
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# mandatory as soon as you develop commercial activities involving pySX127x without disclosing the source code of your
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# own applications, or shipping pySX127x with a closed source product.
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#
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# You should have received a copy of the GNU General Public License along with pySX127. If not, see
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# <http://www.gnu.org/licenses/>.
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import argparse
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class LoRaArgumentParser(argparse.ArgumentParser):
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""" This class extends argparse.ArgumentParser.
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Some commonly used LoRa config parameters are defined
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* ocp
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* spreading factor
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* frequency
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* bandwidth
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* preamble
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Call the parse_args with an additional parameter referencing a LoRa object. The args will be used to configure
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the LoRa.
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"""
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bw_lookup = dict(BW7_8=0, BW10_4=1, BW15_6=2, BW20_8=3, BW31_25=4, BW41_7=5, BW62_5=6, BW125=7, BW250=8, BW500=9)
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cr_lookup = dict(CR4_5=1, CR4_6=2,CR4_7=3,CR4_8=4)
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def __init__(self, description):
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argparse.ArgumentParser.__init__(self, description=description)
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self.add_argument('--ocp', '-c', dest='ocp', default=100, action="store", type=float,
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help="Over current protection in mA (45 .. 240 mA)")
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self.add_argument('--sf', '-s', dest='sf', default=7, action="store", type=int,
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help="Spreading factor (6...12). Default is 7.")
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self.add_argument('--freq', '-f', dest='freq', default=869., action="store", type=float,
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help="Frequency")
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self.add_argument('--bw', '-b', dest='bw', default='BW125', action="store", type=str,
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help="Bandwidth (one of BW7_8 BW10_4 BW15_6 BW20_8 BW31_25 BW41_7 BW62_5 BW125 BW250 BW500).\nDefault is BW125.")
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self.add_argument('--cr', '-r', dest='coding_rate', default='CR4_5', action="store", type=str,
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help="Coding rate (one of CR4_5 CR4_6 CR4_7 CR4_8).\nDefault is CR4_5.")
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self.add_argument('--preamble', '-p', dest='preamble', default=8, action="store", type=int,
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help="Preamble length. Default is 8.")
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def parse_args(self, lora):
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""" Parse the args, perform some sanity checks and configure the LoRa accordingly.
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:param lora: Reference to LoRa object
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:return: args
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"""
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args = argparse.ArgumentParser.parse_args(self)
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args.bw = self.bw_lookup.get(args.bw, None)
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args.coding_rate = self.cr_lookup.get(args.coding_rate, None)
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# some sanity checks
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assert(args.bw is not None)
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assert(args.coding_rate is not None)
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assert(args.sf >=6 and args.sf <= 12)
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# set the LoRa object
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lora.set_freq(args.freq)
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lora.set_preamble(args.preamble)
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lora.set_spreading_factor(args.sf)
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lora.set_bw(args.bw)
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lora.set_coding_rate(args.coding_rate)
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lora.set_ocp_trim(args.ocp)
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return args
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