mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
117 lines
4.7 KiB
Python
117 lines
4.7 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Sun Dec 27 20:43:40 2020
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@author: DJ2LS
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"""
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# CRC aller payloads via XOR scrambeln und dann eine CRC8 mitsenden
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import logging
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import crcengine
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import threading
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import static
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import modem
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import other
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modem = modem.RF()
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crc_algorithm = crcengine.new('crc16-ccitt-false') #load crc16 library
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static.ARQ_PAYLOAD_PER_FRAME = static.FREEDV_PAYLOAD_PER_FRAME - 6
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#class ARQ():
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#
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# def receive(bytes_in):
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#
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# print("TEST")
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def receive(data_in):
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print(data_in[:1])
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def transmit(data_out):
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static.ARQ_PAYLOAD_PER_FRAME = static.FREEDV_PAYLOAD_PER_FRAME - 6
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static.TX_BUFFER = [data_out[i:i+static.ARQ_PAYLOAD_PER_FRAME] for i in range(0, len(data_out), static.ARQ_PAYLOAD_PER_FRAME)] # split incomming bytes to size of 30bytes, create a list and loop through it
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static.TX_BUFFER_SIZE = len(static.TX_BUFFER)
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logging.info("TX | TOTAL PAYLOAD BYTES/FRAMES TO SEND: " + str(len(data_out)) + " / " + str(static.TX_BUFFER_SIZE))
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for n_raw_frame in range(0, static.TX_BUFFER_SIZE, static.ARQ_TX_N_FRAMES): # LOOP THROUGH DATA LIST with steps = ARQ_TX_N_FRAMES
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print("N_RAW_FRAME: " + str(n_raw_frame))
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# ----------- GENERATE PAYLOAD CRC FOR ARQ_TX_N_FRAMES
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burst_total_payload = bytearray()
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for i in range(static.ARQ_TX_N_FRAMES): #bytearray(b'111111111111111111111111222222222222222222222222')
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burst_total_payload = burst_total_payload + static.TX_BUFFER[n_raw_frame + i]
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burst_payload_crc = crc_algorithm(burst_total_payload)
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burst_payload_crc = burst_payload_crc.to_bytes(2, byteorder='big') #b'\xa7\xd6'
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print(burst_payload_crc)
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#-------------------- BUILD ARQBURSTS
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arqburst = []
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for i in range(static.ARQ_TX_N_FRAMES):
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#print(n_raw_frame)
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#print(i)
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#print(n_raw_frame + i)
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#print(static.TX_BUFFER[n_raw_frame + i])
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frame_type = 10 + static.ARQ_TX_N_FRAMES
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frame_type = bytes([frame_type])
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payload_data = bytes(static.TX_BUFFER[n_raw_frame + i])
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arqframe = frame_type + burst_payload_crc + payload_data
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arqburst.append(arqframe)
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#--------------------------------------------- N ATTEMPTS TO SEND BURSTS IF ACK FAILS
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for static.TX_N_RETRIES in range(static.TX_N_MAX_RETRIES):
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static.ACK_RECEIVED = 0
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# ----------------------- Loop through ARQ FRAMES BUFFER with N = Numbers of frames which will be send at once
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for n in range(static.ARQ_TX_N_FRAMES):
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logging.info("TX | SENDING BURST " + str(n+1) + " / " + str(static.ARQ_TX_N_FRAMES))
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modem.Transmit(arqburst[n])
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#modem.RF.Transmit(arqburst[n])
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print(arqburst[n])
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# --------------------------- START TIMER ---> IF TIMEOUT REACHED, ACK_TIMEOUT = 1
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static.ACK_TIMEOUT = 0
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timer = threading.Timer(static.ACK_TIMEOUT_SECONDS * static.ARQ_TX_N_FRAMES, other.timeout)
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timer.start()
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# --------------------------- WHILE TIMEOUT NOT REACHED AND NO ACK RECEIVED --> LISTEN
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logging.info("TX | WAITING FOR ACK")
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while static.ACK_TIMEOUT == 0 and static.ACK_RECEIVED == 0:
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static.MODEM_RECEIVE = True
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else:
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logging.info("TX | ACK TIMEOUT - SENDING AGAIN")
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#--------------- BREAK LOOP IF ACK HAS BEEN RECEIVED
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if static.ACK_RECEIVED == 1:
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#static.TX_N_RETRIES = 3
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break
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# ----------- if no ACK received and out of retries.....stop frame sending
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if static.ACK_RECEIVED == 0:
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logging.info("TX | NO ACK RECEIVED | FRAME NEEDS TO BE RESEND!")
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break
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#-------------------------BREAK TX BUFFER LOOP IF ALL PACKETS HAVE BEEN SENT
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if n_raw_frame == static.TX_BUFFER_SIZE:
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break
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logging.info("TX | BUFFER EMPTY") |