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from math import ceil
import SoapySDR
import numpy as np
import gc
from noptica import *
from gui import GUI
def main():
# For this PoC code, a small memory leak is less harmful than random overflows.
gc.disable()
freq_sample = 1e6
freq_base = 1088230e3
freq_ref = 1088100e3
block_size = 4096
throttle_factor = ceil(freq_sample/125e3)
# note: image band still goes through
freq_ref_abs = np.abs(freq_ref-freq_base)
ref_filter = LinearPhaseFilter(127, [freq_ref_abs-15e3, freq_ref_abs+15e3], pass_zero=False, fs=freq_sample)
meas_delay = Delay(block_size, ref_filter.delay())
gui = GUI(freq_sample, freq_base, block_size)
try:
induction = InductionHeater("/dev/ttyUSB0", 350e3, 445e3)
induction.start()
try:
def stabilizer_cb(spectrum, peak_freq, locked, tuning):
gui.update_ref(spectrum, peak_freq, locked)
induction.set(tuning)
stabilizer = Stabilizer(freq_sample, block_size, freq_ref-freq_base, stabilizer_cb)
position_tracker = PositionTracker()
sdr = SoapySDR.Device()
for channel in range(2):
sdr.setSampleRate(SoapySDR.SOAPY_SDR_RX, channel, freq_sample)
sdr.setFrequency(SoapySDR.SOAPY_SDR_RX, channel, freq_base)
sdr.setGain(SoapySDR.SOAPY_SDR_RX, channel, 55.0)
buf_sdr = BufferedSDR(sdr, [0, 1], block_size, 32)
buf_sdr.start()
try:
throttle = 0
position_acc = 0.0
while True:
buffers = buf_sdr.get()
try:
samples_ref, samples_meas = buffers
# Throttle certain things to avoid overflows due to the limited speed of
# the MHS5200A serial interface and GUI plotting.
throttle += 1
if throttle == throttle_factor:
throttle = 0
if throttle == 0:
stabilizer.input(samples_ref)
gui.update_meas(samples_meas)
if stabilizer.locked():
position = position_tracker.input(ref_filter.input(samples_ref), meas_delay.input(samples_meas))
position_acc += np.mean(position)
if throttle == 0:
gui.update_position(position_acc/throttle_factor)
position_acc = 0.0
else:
position_tracker.reset()
position_acc = 0.0
finally:
buf_sdr.dispose(buffers)
finally:
buf_sdr.stop()
finally:
induction.stop()
finally:
gui.close()
if __name__ == "__main__":
main()