caiyu/qspectrumanalyzer
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge pull request #28 from michaellass/hackrf_ratelimit

Browse Source 
hackrf_sweep: Improve low frequency range capabilities
This commit is contained in:
Michal Krenek (Mikos) 2017-03-24 22:58:56 +01:00 committed by GitHub
commit e75f9a98d9
1 changed files with 29 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
qspectrumanalyzer/backends/hackrf_sweep.py
View File

@ -1,4 +1,4 @@
import subprocess, pprint, struct, shlex import subprocess, pprint, struct, shlex, sys, time
import numpy as np import numpy as np
from Qt import QtCore from Qt import QtCore
@ -20,11 +20,9 @@ class Info(BaseInfo):
stop_freq_min = 0 stop_freq_min = 0
stop_freq_max = 7250 stop_freq_max = 7250
stop_freq = 6000 stop_freq = 6000
bin_size_min = 40 bin_size_min = 3
bin_size_max = 5000 bin_size_max = 5000
bin_size = 1000 bin_size = 1000
interval_min = 0
interval_max = 0
interval = 0 interval = 0
ppm_min = 0 ppm_min = 0
ppm_max = 0 ppm_max = 0
@ -40,10 +38,11 @@ class PowerThread(BasePowerThread):
interval=0.0, gain=40, ppm=0, crop=0, single_shot=False, interval=0.0, gain=40, ppm=0, crop=0, single_shot=False,
device=0, sample_rate=20000000, bandwidth=0, lnb_lo=0): device=0, sample_rate=20000000, bandwidth=0, lnb_lo=0):
"""Setup hackrf_sweep params""" """Setup hackrf_sweep params"""
# theoretically we can support bins smaller than 40 kHz, but it is # Small bin sizes (<40 kHz) are only suitable with an arbitrarily
# unlikely to result in acceptable performance # reduced sweep interval. Bin sizes smaller than 3 kHz showed to be
if bin_size < 40: # infeasible also in these cases.
bin_size = 40 if bin_size < 3:
bin_size = 3
if bin_size > 5000: if bin_size > 5000:
bin_size = 5000 bin_size = 5000
@ -70,7 +69,7 @@ class PowerThread(BasePowerThread):
"device": 0, "device": 0,
"sample_rate": 20e6, # sps "sample_rate": 20e6, # sps
"bin_size": bin_size, # kHz "bin_size": bin_size, # kHz
"interval": 0, # seconds "interval": interval, # seconds
"gain": gain, "gain": gain,
"lna_gain": lna_gain, "lna_gain": lna_gain,
"vga_gain": vga_gain, "vga_gain": vga_gain,
@ -80,6 +79,8 @@ class PowerThread(BasePowerThread):
} }
self.lnb_lo = lnb_lo self.lnb_lo = lnb_lo
self.databuffer = {"timestamp": [], "x": [], "y": []} self.databuffer = {"timestamp": [], "x": [], "y": []}
self.lastsweep = 0
self.interval = interval
print("hackrf_sweep params:") print("hackrf_sweep params:")
pprint.pprint(self.params) pprint.pprint(self.params)
@ -124,7 +125,13 @@ class PowerThread(BasePowerThread):
for i in range(len(data)): for i in range(len(data)):
self.databuffer["y"].append(data[i]) self.databuffer["y"].append(data[i])
if (high_edge / 1e6) >= (self.params["stop_freq"] - self.lnb_lo / 1e6): if (high_edge / 1e6) >= (self.params["stop_freq"] - self.lnb_lo / 1e6):
# We've reached the end of a pass, so sort and display it. # We've reached the end of a pass. If it went too fast for our sweep interval, ignore it
t_finish = time.time()
if (t_finish < self.lastsweep + self.interval):
return
self.lastsweep = t_finish
# otherwise sort and display the data.
sorted_data = sorted(zip(self.databuffer["x"], self.databuffer["y"])) sorted_data = sorted(zip(self.databuffer["x"], self.databuffer["y"]))
self.databuffer["x"], self.databuffer["y"] = [list(x) for x in zip(*sorted_data)] self.databuffer["x"], self.databuffer["y"] = [list(x) for x in zip(*sorted_data)]
self.data_storage.update(self.databuffer) self.data_storage.update(self.databuffer)
@ -136,10 +143,20 @@ class PowerThread(BasePowerThread):
self.powerThreadStarted.emit() self.powerThreadStarted.emit()
while self.alive: while self.alive:
buf = self.process.stdout.read(4) try:
buf = self.process.stdout.read(4)
except AttributeError as e:
print(e, file=sys.stderr)
continue
if buf: if buf:
(record_length,) = struct.unpack('I', buf) (record_length,) = struct.unpack('I', buf)
buf = self.process.stdout.read(record_length) try:
buf = self.process.stdout.read(record_length)
except AttributeError as e:
print(e, file=sys.stderr)
continue
if buf: if buf:
self.parse_output(buf) self.parse_output(buf)
else: else: