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Duarte-Nunes opened this issue Jun 27, 2024 · 1 comment
Open

Running simple example #1

Duarte-Nunes opened this issue Jun 27, 2024 · 1 comment

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@Duarte-Nunes
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Duarte-Nunes commented Jun 27, 2024 •
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Hello, recently i've taken an interest in researching Lora and i'm on the beginning steps. Let me start by congratulating you on this repository it goes a long way to push open source Lora research forward.

I came up with a simple example that excludes the radio and simply tries to generate Lora samples:


import lora
import lora_utils
import numpy as np

bandwidth = 125000
center_freq = 868e6
sample_rate = 1e6

srcID = 0
dstID = 1

SF = 7

data_array = np.random.randint(255, size=(500), dtype=np.uint8)


packet_size = 250

CR = 1

data = lora_utils.pack_lora_data(
    data_array, SF, bandwidth, packet_size, srcID, dstID, extended_sqn=False, CR=CR)

for pkt in data:
    samples = lora.encode(center_freq, pkt.SF, pkt.BW, pkt.payload, sample_rate, pkt.src, pkt.dst, pkt.seqn, 1, 1, 0, 8)

However when running this code i come across this error:

/home/duarte.nunes/PlutoSDR/code/sdr-lora/lora.py:176: RuntimeWarning: overflow encountered in scalar multiply
  int(n_bits_hdr + n_blk_tot * n_bits_blk), dtype=np.uint8)
Traceback (most recent call last):
  File "/home/duarte.nunes/PlutoSDR/code/sdr-lora/tx_rx_no_radio.py", line 25, in <module>
    samples = lora.encode(center_freq, pkt.SF, pkt.BW, pkt.payload, sample_rate, pkt.src, pkt.dst, pkt.seqn, 1, 1, 0, 8)

  File "/home/duarte.nunes/PlutoSDR/code/sdr-lora/lora.py", line 926, in encode
    complex_samples = complex_lora_packet(K, preamble_bits, implicit_header, cr, enable_crc, src, dst, seqn, BW, OSF, SF, Trise, N,

  File "/home/duarte.nunes/PlutoSDR/code/sdr-lora/lora.py", line 891, in complex_lora_packet
    p = lora_packet(BW, OSF, SF, k1, k2, n_pr, IH, CR, MAC_CRC,

  File "/home/duarte.nunes/PlutoSDR/code/sdr-lora/lora.py", line 28, in lora_packet
    [PAYLOAD, n_sym_payload] = lora_payload_init(

  File "/home/duarte.nunes/PlutoSDR/code/sdr-lora/lora.py", line 180, in lora_payload_init
    PAYLOAD[8 * 3 + byte_range] = num2binary(LENGTH, 8)

IndexError: index 31 is out of bounds for axis 0 with size 24

I've tried tinkering with the parameters but it seems that there is always a missmatch in array sizes.

Do you have any insights on what might be causing this? Thank you for your time.
@eabase
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eabase commented Oct 17, 2024 •
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@Duarte-Nunes
Were you able to figure out what packages are needed here?
Did you manage to get this to run?

@fabio-busacca
BUMP

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