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471cc1ee94
Completes bias-T support across all SDR command builder methods. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
145 lines
4.3 KiB
Python
145 lines
4.3 KiB
Python
"""
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LimeSDR command builder implementation.
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Uses SoapySDR-based tools for FM demodulation and signal capture.
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LimeSDR supports 100 kHz to 3.8 GHz frequency range.
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"""
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from __future__ import annotations
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from typing import Optional
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from .base import CommandBuilder, SDRCapabilities, SDRDevice, SDRType
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class LimeSDRCommandBuilder(CommandBuilder):
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"""LimeSDR command builder using SoapySDR tools."""
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CAPABILITIES = SDRCapabilities(
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sdr_type=SDRType.LIME_SDR,
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freq_min_mhz=0.1, # 100 kHz
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freq_max_mhz=3800.0, # 3.8 GHz
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gain_min=0.0,
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gain_max=73.0, # Combined LNA + TIA + PGA
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sample_rates=[1000000, 2000000, 4000000, 8000000, 10000000, 20000000],
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supports_bias_t=False,
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supports_ppm=False, # Uses TCXO, no PPM correction needed
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tx_capable=True
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)
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def _build_device_string(self, device: SDRDevice) -> str:
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"""Build SoapySDR device string for LimeSDR."""
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if device.serial and device.serial != 'N/A':
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return f'driver=lime,serial={device.serial}'
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return f'driver=lime'
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def build_fm_demod_command(
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self,
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device: SDRDevice,
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frequency_mhz: float,
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sample_rate: int = 22050,
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gain: Optional[float] = None,
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ppm: Optional[int] = None,
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modulation: str = "fm",
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squelch: Optional[int] = None,
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bias_t: bool = False
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) -> list[str]:
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"""
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Build SoapySDR rx_fm command for FM demodulation.
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For pager decoding with LimeSDR.
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Note: LimeSDR does not support bias-T, parameter is ignored.
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"""
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device_str = self._build_device_string(device)
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cmd = [
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'rx_fm',
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'-d', device_str,
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'-f', f'{frequency_mhz}M',
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'-M', modulation,
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'-s', str(sample_rate),
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]
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if gain is not None and gain > 0:
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# LimeSDR gain is applied to LNAH element
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cmd.extend(['-g', f'LNAH={int(gain)}'])
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if squelch is not None and squelch > 0:
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cmd.extend(['-l', str(squelch)])
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# Output to stdout
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cmd.append('-')
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return cmd
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def build_adsb_command(
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self,
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device: SDRDevice,
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gain: Optional[float] = None,
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bias_t: bool = False
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) -> list[str]:
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"""
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Build dump1090 command with SoapySDR support for ADS-B decoding.
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Uses dump1090 compiled with SoapySDR support, or readsb as alternative.
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Note: Requires dump1090 with SoapySDR support or readsb.
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Note: LimeSDR does not support bias-T, parameter is ignored.
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"""
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device_str = self._build_device_string(device)
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# Try readsb first (better SoapySDR support), fallback to dump1090
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cmd = [
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'readsb',
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'--net',
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'--device-type', 'soapysdr',
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'--device', device_str,
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'--quiet'
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]
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if gain is not None:
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cmd.extend(['--gain', str(int(gain))])
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return cmd
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def build_ism_command(
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self,
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device: SDRDevice,
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frequency_mhz: float = 433.92,
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gain: Optional[float] = None,
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ppm: Optional[int] = None,
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bias_t: bool = False
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) -> list[str]:
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"""
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Build rtl_433 command with SoapySDR support for ISM band decoding.
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rtl_433 has native SoapySDR support via -d flag.
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Note: LimeSDR does not support bias-T, parameter is ignored.
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"""
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device_str = self._build_device_string(device)
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cmd = [
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'rtl_433',
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'-d', device_str,
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'-f', f'{frequency_mhz}M',
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'-F', 'json'
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]
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if gain is not None and gain > 0:
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cmd.extend(['-g', str(int(gain))])
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# PPM not typically needed for LimeSDR (TCXO)
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# but include if specified
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if ppm is not None and ppm != 0:
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cmd.extend(['-p', str(ppm)])
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return cmd
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def get_capabilities(self) -> SDRCapabilities:
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"""Return LimeSDR capabilities."""
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return self.CAPABILITIES
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@classmethod
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def get_sdr_type(cls) -> SDRType:
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"""Return SDR type."""
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return SDRType.LIME_SDR
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