def testPlutoDDS(self):
# See if we can tone from Pluto using DMAs
sdr = Pluto()
sdr.tx_lo = 1000000000
sdr.rx_lo = 1000000000
sdr.tx_cyclic_buffer = True
sdr.tx_hardwaregain_chan0 = -30
sdr.gain_control_mode_chan0 = "slow_attack"
sdr.rx_buffer_size = 2**20
sdr.sample_rate = 4000000
sdr.loopback = 1
# Create a sinewave waveform
RXFS = int(sdr.sample_rate)
sdr.dds_enabled = [1, 1, 1, 1]
fc = 2000
sdr.dds_frequencies = [fc, 0, fc, 0]
sdr.dds_scales = [1, 0, 1, 0]
sdr.dds_phases = [90000, 0, 0, 0]
# Pass through SDR
for _ in range(5):
data = sdr.rx()
# Turn off loopback (for other tests)
sdr.loopback = 0
tone_freq = self.freq_est(data, RXFS)
# if self.do_plots:
# import matplotlib.pyplot as plt
#
# reals = np.real(data)
# plt.plot(reals)
# imags = np.imag(data)
# plt.plot(imags)
# plt.xlabel("Samples")
# plt.ylabel("Amplitude [dbFS]")
# plt.show()
diff = np.abs(tone_freq - fc)
del sdr
self.assertGreater(fc * 0.01, diff, "Frequency offset")
def testPlutoDAC(self):
# See if we can tone from Pluto using DMAs
sdr = Pluto()
sdr.tx_lo = 1000000000
sdr.rx_lo = 1000000000
sdr.tx_cyclic_buffer = True
sdr.tx_hardwaregain_chan0 = -30
sdr.gain_control_mode_chan0 = "slow_attack"
sdr.rx_buffer_size = 2**20
# Create a sinewave waveform
RXFS = int(sdr.sample_rate)
fc = RXFS * 0.1
N = 2**15
ts = 1 / float(RXFS)
t = np.arange(0, N * ts, ts)
i = np.cos(2 * np.pi * t * fc) * 2**15 * 0.5
q = np.sin(2 * np.pi * t * fc) * 2**15 * 0.5
iq = i + 1j * q
# Pass through SDR
sdr.tx(iq)
for _ in range(5):
data = sdr.rx()
tone_freq = self.freq_est(data, RXFS)
# if self.do_plots:
# import matplotlib.pyplot as plt
#
# reals = np.real(data)
# plt.plot(reals)
# imags = np.imag(data)
# plt.plot(imags)
# plt.xlabel("Samples")
# plt.ylabel("Amplitude [dbFS]")
# plt.show()
diff = np.abs(tone_freq - fc)
del sdr
self.assertGreater(fc * 0.01, diff, "Frequency offset")