def __init__(self, uri=PLUTO_ID):
# access to internal devices
try:
self.ctx = iio.Context(uri)
except OSError:
self.ctx = None
print('exception: no iio device context found at', uri)
return
logging.debug('found context for pluto device')
self.name = 'plutosdr'
self.phy = self.ctx.find_device('ad9361-phy')
# individual TRx controls
self.phy_rx = self.phy.find_channel('voltage0', is_output=False)
self.phy_tx = self.phy.find_channel('voltage0', is_output=True)
# access to data channels for Rx
self.adc = self.ctx.find_device('cf-ad9361-lpc')
# access to data channels for Tx
self.dac = self.ctx.find_device('cf-ad9361-dds-core-lpc')
self.tx_channels = [self.dac.find_channel('voltage0', True)]
self.tx_channels.append(self.dac.find_channel('voltage1', True))
# also access to the internal 2 tone generator
self.dds = pluto_dds.Dds(self.dac)
# tx buffer, created in writeTx and retained for continuous output
self._tx_buff = None
self.tx_state = self.TX_OFF
def testSetAmplitude(self):
"""confirm amplitude values read/write and amp <= 0 dB"""
dds = pluto_dds.Dds(self.dev)
dds.setAmplitude()
self.assertEqual(dds.t1.amplitude, 0,
'no arguments turns amplitude 1 off')
self.assertEqual(dds.t2.amplitude, 0,
'no arguments turns amplitude 2 off')
with self.assertRaises(ValueError, msg='values set in -dB '):
dds.setAmplitude(10)
dds.setAmplitude(-10) # this is in dB
npt.assert_almost_equal(
dds.t1.amplitude,
0.1,
decimal=3,
err_msg='first arguments turn sets f1 amplitude')
self.assertEqual(dds.t2.amplitude, 0,
'no arguments turn amplitude 2 off')
self.assertFalse(dds.isOff(), 'only 1 tone indicates on')
dds.setAmplitude(-13, -13)
npt.assert_almost_equal(dds.t1.amplitude,
0.05,
decimal=3,
err_msg='first arguments sets f1 amplitude')
npt.assert_almost_equal(dds.t2.amplitude,
0.05,
decimal=3,
err_msg='second arguments sets f2 amplitude')
def testSetPhase(self):
"""confirm the relative I/Q phases for +/- frequencies"""
dds = pluto_dds.Dds(self.dev)
tone = pluto_dds.DdsTone(self.dev, 'F1')
tone.frequency = 1
tone.phase = 180 # set phase mid way
i_phase = tone.getPhase()
q_phase = tone.getPhase('Q')
def testDdsCreate(self):
"""create a Dds instance"""
self.assertIsInstance(self.dev, iio.Device, 'ok')
dds = pluto_dds.Dds(self.dev)
self.assertIsInstance(dds.t1, pluto_dds.DdsTone,
'Dds Tone1 instance created')
self.assertIsInstance(dds.t2, pluto_dds.DdsTone,
'Dds Tone2 instance created')
self.assertTrue(dds.isOff(), "initial state is both off")
def testSetFrequency(self):
"""confirm read and write to properties"""
dds = pluto_dds.Dds(self.dev)
fs = dds.getSamplingFreq() # test tones must be within +/- hald Fs
dds.setFrequency(fs / 4)
npt.assert_almost_equal(dds.t1.frequency,
fs / 4,
decimal=3,
err_msg='set f1 frequency')
dds.setFrequency(fs / 4, -fs / 8)
npt.assert_almost_equal(dds.t1.frequency,
fs / 4,
decimal=3,
err_msg='set f1 frequency')
npt.assert_almost_equal(dds.t2.frequency,
-fs / 8,
decimal=3,
err_msg='set f2 frequency')