Class: PWN::SDR::Decoder::Bluetooth::DemodIQ

Inherits:
Object
  • Object
show all
Defined in:
lib/pwn/sdr/decoder/bluetooth.rb

Overview

Streaming BLE GFSK demod for Base.run_iq — I/Q → advertising PDUs.

Constant Summary collapse

BAUD = 
1_000_000

Instance Method Summary collapse

Constructor Details

#initialize(rate:, channel: 37, ble: true) ⇒ DemodIQ

Returns a new instance of DemodIQ.



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# File 'lib/pwn/sdr/decoder/bluetooth.rb', line 31

def initialize(rate:, channel: 37, ble: true)
  @rate    = rate.to_f
  @channel = channel
  @ble     = ble
  @bits    = []
  @seen    = {}
end

Instance Method Details

#feed_iq(samples, rate: nil) ⇒ Object 



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# File 'lib/pwn/sdr/decoder/bluetooth.rb', line 39

def feed_iq(samples, rate: nil, &)
  @rate = rate.to_f if rate
  # Try both polarities — GFSK sign depends on tuner spectral inversion.
  new_bits = PWN::SDR::Decoder::DSP.gfsk_slice(
    iq: samples, rate: @rate, baud: BAUD, bt: 0.5
  )
  @bits.concat(new_bits)
  scan(&) if block_given?
  @bits.shift(@bits.length - 4096) if @bits.length > 65_536
end