add pluto example from adi

charon_vna/pluto_example.py

@@ -0,0 +1,63 @@
+# Copyright (C) 2019 Analog Devices, Inc.
+#
+# SPDX short identifier: ADIBSD
+
+
+# I'm not sure why but sometimes I need to run this once to make the rest of my scripts work.
+# Probably just me running things manually out of order or something but I'm throwing this in here until I verify.
+
+import time
+
+import adi
+import matplotlib.pyplot as plt
+import numpy as np
+from scipy import signal
+
+# Create radio
+sdr = adi.Pluto(uri="ip:192.168.3.1")
+
+# Configure properties
+sdr.rx_rf_bandwidth = 4000000
+sdr.rx_lo = 2000000000
+sdr.tx_lo = 2000000000
+sdr.tx_cyclic_buffer = True
+sdr.tx_hardwaregain_chan0 = -30
+sdr.gain_control_mode_chan0 = "slow_attack"
+
+# Read properties
+print("RX LO %s" % (sdr.rx_lo))
+
+# Create a sinewave waveform
+fs = int(sdr.sample_rate)
+print(fs)
+N = 1024
+fc = int(-3000000 / (fs / N)) * (fs / N)
+ts = 1 / float(fs)
+t = np.arange(0, N * ts, ts)
+i = np.cos(2 * np.pi * t * fc) * 2**14
+q = np.sin(2 * np.pi * t * fc) * 2**14
+iq = i + 1j * q
+
+# Send data
+sdr.tx(iq)
+
+# Collect data
+for r in range(20):
+    x = sdr.rx()
+    f, Pxx_den = signal.periodogram(x, fs, return_onesided=False)
+    plt.clf()
+    plt.semilogy(f, Pxx_den)
+    plt.ylim([1e-7, 1e2])
+    plt.xlabel("frequency [Hz]")
+    plt.ylabel("PSD [V**2/Hz]")
+    plt.grid(True)
+    plt.draw()
+    plt.pause(0.05)
+    time.sleep(0.1)
+
+plt.show()
+
+
+plt.plot(np.real(x))
+plt.plot(np.imag(x))
+plt.show()