Attribute error for run code from example

[no111u3]

Try from Pluto example (Mac OS 13.5, M2, arm64)

>>> import adi
>>> sdr = adi.Pluto('ip:pluto.local')
>>> sdr.rx_lo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/homebrew/lib/python3.11/site-packages/adi/ad936x.py", line 193, in rx_lo
    return self._get_iio_attr("altvoltage0", "frequency", True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/adi/attribute.py", line 127, in _get_iio_attr
    self._get_iio_attr_str(channel_name, attr_name, output, _ctrl)
  File "/opt/homebrew/lib/python3.11/site-packages/adi/attribute.py", line 122, in _get_iio_attr_str
    return channel.attrs[attr_name].value
           ~~~~~~~~~~~~~^^^^^^^^^^^
KeyError: 'frequency'

[tfcollins]

This is a known issue with the libiio python bindings. There is a related issue here: https://github.com/analogdevicesinc/libiio/issues/871

The development team doesn't have Apple Silicon machines so think is hard for us to debug at the moment. If you can get the requested information from the issue it would be helpful.

-Travis

[no111u3]

First of all, thanks for your fast answer. For the begin I get info from iio_info for check how it works (I already use this library in sdrangel software and it works good):

% iio_info -u 'ip:pluto.local'
Library version: 0.23 (git tag: v0.23)
Compiled with backends: xml ip usb
IIO context created with network backend.
Backend version: 0.24 (git tag: v0.24)
Backend description string: 192.168.2.1 Linux (none) 5.10.0-98231-g9dfba10b795d #54 SMP PREEMPT Mon Jul 11 14:38:48 CEST 2022 armv7l
IIO context has 9 attributes:
    hw_model: Analog Devices PlutoSDR Rev.C (Z7010-AD9364)
    hw_model_variant: 1
    hw_serial: 10447376de0b000e00001f00e99f99a2f0
    fw_version: v0.35
    ad9361-phy,xo_correction: 40000046
    ad9361-phy,model: ad9364
    local,kernel: 5.10.0-98231-g9dfba10b795d
    uri: ip:pluto.local
    ip,ip-addr: 192.168.2.1
IIO context has 4 devices:
    iio:device0: ad9361-phy
        9 channels found:
            altvoltage1: TX_LO (output)
            8 channel-specific attributes found:
                attr  0: external value: 0
                attr  1: fastlock_load value: 0
                attr  2: fastlock_recall ERROR: Invalid argument (22)
                attr  3: fastlock_save value: 0 181,181,181,181,181,181,181,181,181,181,181,181,181,181,181,181
                attr  4: fastlock_store value: 0
                attr  5: frequency value: 2450000000
                attr  6: frequency_available value: [46875001 1 6000000000]
                attr  7: powerdown value: 0
            voltage0:  (input)
            15 channel-specific attributes found:
                attr  0: bb_dc_offset_tracking_en value: 1
                attr  1: filter_fir_en value: 0
                attr  2: gain_control_mode value: slow_attack
                attr  3: gain_control_mode_available value: manual fast_attack slow_attack hybrid
                attr  4: hardwaregain value: 46.000000 dB
                attr  5: hardwaregain_available value: [-1 1 73]
                attr  6: quadrature_tracking_en value: 1
                attr  7: rf_bandwidth value: 1500000
                attr  8: rf_bandwidth_available value: [200000 1 56000000]
                attr  9: rf_dc_offset_tracking_en value: 1
                attr 10: rf_port_select value: A_BALANCED
                attr 11: rf_port_select_available value: A_BALANCED B_BALANCED C_BALANCED A_N A_P B_N B_P C_N C_P TX_MONITOR1 TX_MONITOR2 TX_MONITOR1_2
                attr 12: rssi value: 68.00 dB
                attr 13: sampling_frequency value: 4000000
                attr 14: sampling_frequency_available value: [2083333 1 61440000]
            voltage3:  (output)
            8 channel-specific attributes found:
                attr  0: filter_fir_en value: 0
                attr  1: raw value: 306
                attr  2: rf_bandwidth value: 18000000
                attr  3: rf_bandwidth_available value: [200000 1 40000000]
                attr  4: rf_port_select_available value: A B
                attr  5: sampling_frequency value: 4000000
                attr  6: sampling_frequency_available value: [2083333 1 61440000]
                attr  7: scale value: 1.000000
            altvoltage0: RX_LO (output)
            8 channel-specific attributes found:
                attr  0: external value: 0
                attr  1: fastlock_load value: 0
                attr  2: fastlock_recall ERROR: Invalid argument (22)
                attr  3: fastlock_save value: 0 59,59,59,59,59,59,59,59,59,59,59,59,59,59,59,59
                attr  4: fastlock_store value: 0
                attr  5: frequency value: 92400000
                attr  6: frequency_available value: [70000000 1 6000000000]
                attr  7: powerdown value: 0
... // skipped for short context

[no111u3]

Than I try to reach out by iio_attr it also accessibly:

% iio_attr -u 'ip:pluto.local' -c 'ad9361-phy' 'altvoltage0' 'frequency'
2399999998

But in python I reach out another result:

>>> import iio
>>> ctx = iio.Context('ip:pluto.local')
>>> ctx.devices[0].name
'ad9361-phy'
>>> ctx.devices[0].channels[0].name
'RX_LO'
>>> ctx.devices[0].channels[0].attrs
{'external': <iio.ChannelAttr object at 0x100e17e50>}

[no111u3]

Also I suppose that only one attribute for each channel got:

>>> for dev in ctx.devices:
...     for chan in dev.channels:
...             attrs_count = len(chan.attrs)
...             print(f'{dev.name}: {chan.name}: {attrs_count}')
...
ad9361-phy: RX_LO: 1
ad9361-phy: TX_LO: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
xadc: None: 1
xadc: vccint: 1
xadc: vccaux: 1
xadc: vccbram: 1
xadc: vccpint: 1
xadc: vccpaux: 1
xadc: vccoddr: 1
xadc: vrefp: 1
xadc: vrefn: 1
xadc: None: 1
cf-ad9361-dds-core-lpc: TX1_I_F1: 1
cf-ad9361-dds-core-lpc: TX1_I_F2: 1
cf-ad9361-dds-core-lpc: TX1_Q_F1: 1
cf-ad9361-dds-core-lpc: TX1_Q_F2: 1
cf-ad9361-dds-core-lpc: None: 1
cf-ad9361-dds-core-lpc: None: 1
cf-ad9361-lpc: None: 1
cf-ad9361-lpc: None: 1

[no111u3]

I added debug to channel constructor:

print([
                _c_get_attr(_channel, x).decode("ascii")
                for x in range(0, _c_attr_count(_channel))
            ])

And got strange output:

['external', 'external', 'external', 'external', 'external', 'external', 'external', 'external']
['bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en']
['filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en']
['external', 'external', 'external', 'external', 'external', 'external', 'external', 'external']
['filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en']
['input']
['filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en', 'filter_fir_en']
['bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en', 'bb_dc_offset_tracking_en']
['voltage_filter_fir_en']
ad9361-phy: RX_LO: 1
ad9361-phy: TX_LO: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1
ad9361-phy: None: 1

[no111u3]

This issue generates by wrong bindings signatures fixed by https://github.com/analogdevicesinc/libiio/commit/1246cb031728f4958cfb4324678f600e637bf21c

[no111u3]

@tfcollins please look at my investigation, I think I found the main issue and possible solution.

[tfcollins]

If you use the iio.py from the libiio master branch does it resolve the issue?

[no111u3]

Yes sure, it fully resolve my issue

[tfcollins]

kk thanks for checking. I'll be creating the python release soon for v0.25 and we'll update the pyadi-iio dependencies