iio_read.py

#!/usr/bin/env python
import iio
import struct
import numpy as np
import matplotlib.pyplot as plt

#initalize the iio device and read samples from the channel voltage0
ctx = iio.Context("ip:192.168.2.1")
dev = ctx.find_device('cf-ad9361-lpc')
ch0 = dev.find_channel('voltage0', False)
ch0.enabled = True
nsamples = 4096

buf = iio.Buffer(dev, nsamples)
data = np.zeros(nsamples, dtype=np.int16) 
while True:
    buf.refill()
    data_bytes = buf.read()
    byte=0
    for i in range(0, nsamples):
        data[i] = struct.unpack('<h', data_bytes[byte:byte+2])[0]
        byte+=2
    plt.plot(data)
    plt.autoscale(False)
    plt.grid(True)
    plt.ylim([-100,100])
    plt.xlim([0, nsamples])
    plt.draw()
    plt.pause(0.001)
    plt.clf()