Custom version of https://github.com/tomelec/RPi-LoRa-KISS-TNC
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196 lines
7.1 KiB
196 lines
7.1 KiB
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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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 <http://www.gnu.org/licenses/>.
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import sys
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from asyncio import QueueEmpty
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import traceback
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sys.path.insert(0, './pySX127x/')
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from pySX127x.SX127x.LoRa import LoRa
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from pySX127x.SX127x.constants import *
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from pySX127x.SX127x.board_config import BOARD
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import time
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#import KissHelper
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class LoraAprsKissTnc(LoRa):
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LORA_APRS_HEADER = b"<\xff\x01"
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# APRS data types
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DATA_TYPES_POSITION = b"!'/@`"
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DATA_TYPE_MESSAGE = b":"
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DATA_TYPE_THIRD_PARTY = b"}"
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queue = None
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server = None
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# init has LoRa APRS default config settings - might be initialized different when creating object with parameters
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def __init__(self, queue, server, frequency=433.775, preamble=8, spreadingFactor=12, bandwidth=BW.BW125,
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codingrate=CODING_RATE.CR4_5, appendSignalReport = True, paSelect = 1, MaxoutputPower = 15, outputPower = 15, verbose=False):
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# Init SX127x
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BOARD.setup()
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super(LoraAprsKissTnc, self).__init__(verbose)
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self.queue = queue
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if appendSignalReport == 'False':
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appendSignalReport = False
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self.appendSignalReport = appendSignalReport
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self.set_mode(MODE.SLEEP)
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self.set_freq(frequency)
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self.set_preamble(preamble)
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self.set_spreading_factor(spreadingFactor)
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if bandwidth == 'BW7_8':
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bandwidth = BW.BW7_8
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elif bandwidth == 'BW10_4':
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bandwidth = BW.BW10_4
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elif bandwidth == 'BW15_6':
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bandwidth = BW.BW15_6
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elif bandwidth == 'BW20_8':
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bandwidth = BW.BW20_8
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elif bandwidth == 'BW31_25':
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bandwidth = BW.BW31_25
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elif bandwidth == 'BW41_7':
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bandwidth = BW.BW41_7
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elif bandwidth == 'BW62_5':
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bandwidth = BW.BW62_5
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elif bandwidth == 'BW125':
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bandwidth = BW.BW125
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elif bandwidth == 'BW250':
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bandwidth = BW.BW250
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elif bandwidth == 'BW500':
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bandwidth = BW.BW500
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else:
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bandwidth = BW.BW125
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self.set_bw(bandwidth)
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self.set_low_data_rate_optim(True)
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if codingrate == 'CR4_5':
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codingrate = CODING_RATE.CR4_5
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elif codingrate == 'CR4_6':
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codingrate = CODING_RATE.CR4_6
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elif codingrate == 'CR4_7':
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codingrate = CODING_RATE.CR4_7
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elif codingrate == 'CR4_8':
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codingrate = CODING_RATE.CR4_8
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else:
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codingrate = CODING_RATE.CR4_5
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self.set_coding_rate(codingrate)
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if outputPower == 20:
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# Current limiter 180mA for +20dBm
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self.set_ocp_trim(180)
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# Set PA to +20dBm
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self.set_pa_config(1, 15, 15)
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self.set_pa_dac(1)
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#print("+20dBm")
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else:
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# Current limiter 100mA for 17dBm max
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self.set_ocp_trim(100)
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self.set_pa_config(paSelect, MaxoutputPower, outputPower)
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#print("max. +17dBm")
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# CRC on
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self.set_rx_crc(1)
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self.set_max_payload_length(255)
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self.set_dio_mapping([0] * 6)
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self.server = server
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self.reset_ptr_rx()
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self.set_mode(MODE.RXCONT)
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def startListening(self):
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try:
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while True:
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# only transmit if no signal is detected to avoid collisions
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if not self.get_modem_status()["signal_detected"]:
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# print("RSSI: %idBm" % lora.get_rssi_value())
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# FIXME: Add noise floor measurement for telemetry
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if not self.queue.empty():
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try:
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data = self.queue.get(block=False)
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if self.aprs_data_type(data) == self.DATA_TYPE_THIRD_PARTY:
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# remove third party thing
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data = data[data.find(self.DATA_TYPE_THIRD_PARTY) + 1:]
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# Add LoRa-APRS header (original, this was indented one position further, only executed when above if-statement was true. Think it should be executed at all times.
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data = self.LORA_APRS_HEADER + data
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print("LoRa TX: " + repr(data))
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self.transmit(data)
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except QueueEmpty:
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pass
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time.sleep(0.50)
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except KeyboardInterrupt:
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BOARD.teardown()
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def on_rx_done(self):
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payload = self.read_payload(nocheck=True)
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if not payload:
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print("No Payload!")
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return
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rssi = self.get_pkt_rssi_value()
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snr = self.get_pkt_snr_value()
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data = bytes(payload)
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print("LoRa RX[%idBm/%idB, %ibytes]: %s" %(rssi, snr, len(data), repr(data)))
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flags = self.get_irq_flags()
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if any([flags[s] for s in ['crc_error', 'rx_timeout']]):
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print("Receive Error, discarding frame.")
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# print(self.get_irq_flags())
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self.clear_irq_flags(RxDone=1, PayloadCrcError=1, RxTimeout=1) # clear rxdone IRQ flag
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self.reset_ptr_rx()
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self.set_mode(MODE.RXCONT)
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return
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if self.server:
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# remove LoRa-APRS header if present
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if data[0:len(self.LORA_APRS_HEADER)] == self.LORA_APRS_HEADER:
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data = data[len(self.LORA_APRS_HEADER):]
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if self.appendSignalReport:
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# Signal report only for certain frames, not messages!
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if self.aprs_data_type(data) in self.DATA_TYPES_POSITION:
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data += b" RSSI=%idBm SNR=%idB" % (rssi, snr)
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self.server.send(data, {"level":rssi, "snr":snr})
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self.clear_irq_flags(RxDone=1) # clear rxdone IRQ flag
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self.reset_ptr_rx()
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self.set_mode(MODE.RXCONT)
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# self.set_mode(MODE.CAD)
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def on_tx_done(self):
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print("TX DONE")
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self.clear_irq_flags(TxDone=1) # clear txdone IRQ flag
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self.set_dio_mapping([0] * 6)
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self.set_mode(MODE.RXCONT)
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def transmit(self, data):
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self.write_payload([c for c in data])
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self.set_dio_mapping([1, 0, 0, 0, 0, 0])
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self.set_mode(MODE.TX)
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def aprs_data_type(self, lora_aprs_frame):
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delimiter_position = lora_aprs_frame.find(b":")
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try:
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return lora_aprs_frame[delimiter_position + 1]
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except IndexError:
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return ""
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