rx_cont.py

#!/usr/bin/env python3

""" A simple continuous receiver class. """

# Copyright 2015 Mayer Analytics Ltd.
#
# This file is part of pySX127x.
#
# pySX127x is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public
# License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# pySX127x is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You can be released from the requirements of the license by obtaining a commercial license. Such a license is
# mandatory as soon as you develop commercial activities involving pySX127x without disclosing the source code of your
# own applications, or shipping pySX127x with a closed source product.
#
# You should have received a copy of the GNU General Public License along with pySX127.  If not, see
# <http://www.gnu.org/licenses/>.


from time import sleep
from SX127x.LoRa import *
from SX127x.LoRaArgumentParser import LoRaArgumentParser
from SX127x.board_config import BOARD

BOARD.setup()

parser = LoRaArgumentParser("Continous LoRa receiver.")


class LoRaRcvCont(LoRa):
    def __init__(self, verbose=False):
        super(LoRaRcvCont, self).__init__(verbose)
        self.set_mode(MODE.SLEEP)
        self.set_dio_mapping([0] * 6)

    def on_rx_done(self):
        BOARD.led_on()
        rssi_value = self.get_rssi_value()
        print("\nRxDone, RSSI: %d"%rssi_value)
        self.clear_irq_flags(RxDone=1)
        payload = self.read_payload(nocheck=True)
        print(bytes(payload).decode("utf-8",'ignore'))
        self.set_mode(MODE.SLEEP)
        self.reset_ptr_rx()
        BOARD.led_off()
        self.set_mode(MODE.RXCONT)

    def on_tx_done(self):
        print("\nTxDone")
        print(self.get_irq_flags())

    def on_cad_done(self):
        print("\non_CadDone")
        print(self.get_irq_flags())

    def on_rx_timeout(self):
        print("\non_RxTimeout")
        print(self.get_irq_flags())

    def on_valid_header(self):
        print("\non_ValidHeader")
        print(self.get_irq_flags())

    def on_payload_crc_error(self):
        print("\non_PayloadCrcError")
        print(self.get_irq_flags())

    def on_fhss_change_channel(self):
        print("\non_FhssChangeChannel")
        print(self.get_irq_flags())

    def start(self):
        self.reset_ptr_rx()
        self.set_mode(MODE.RXCONT)
        while True:
            sleep(.5)
            rssi_value = self.get_rssi_value()
            status = self.get_modem_status()
            sys.stdout.flush()
            sys.stdout.write("\r%d %d %d" % (rssi_value, status['rx_ongoing'], status['modem_clear']))


lora = LoRaRcvCont(verbose=False)
args = parser.parse_args(lora)

lora.set_mode(MODE.STDBY)
lora.set_pa_config(pa_select=1)
lora.set_rx_crc(True)
#lora.set_coding_rate(CODING_RATE.CR4_5)
#lora.set_pa_config(max_power=0, output_power=0)
#lora.set_lna_gain(GAIN.G1)
#lora.set_implicit_header_mode(False)
#lora.set_low_data_rate_optim(True)
#lora.set_pa_ramp(PA_RAMP.RAMP_50_us)
#lora.set_agc_auto_on(True)
lora.set_sync_word(0x34)

print(lora)
assert(lora.get_agc_auto_on() == 1)

try: input("Press enter to start...")
except: pass

try:
    lora.start()
except KeyboardInterrupt:
    sys.stdout.flush()
    print("")
    sys.stderr.write("KeyboardInterrupt\n")
finally:
    sys.stdout.flush()
    print("")
    lora.set_mode(MODE.SLEEP)
    print(lora)
    BOARD.teardown()