how to connect a buffer rx() to the ADC?

[karu2003]

how to connect a buffer rx() to the ADC?

I did it by analogy with other ADCs, but it doesn’t work.

target_device = "ad7476a"
samples = 100
dev = ctx.find_device(target_device)
buf = iio.Buffer(dev, samples)

or add to class init
rx.init(self)

 ADC = ad7476.ad7476a("ip:analog.local")
 ADC.rx_buffer_size = samples
 ADC.rx_enabled_channels = [ad_channel]
 data = ADC.rx()

I get an error

analog@analog:~/rpi_ad7476 $ /usr/bin/python3 /home/analog/rpi_ad7476/ad7476.py
Traceback (most recent call last):
File "/home/analog/rpi_ad7476/ad7476.py", line 65, in
buf = iio.Buffer(dev, samples)
File "/usr/local/lib/python3.9/dist-packages/iio.py", line 981, in init
self._buffer = _create_buffer(device._device, samples_count, cyclic)
File "/usr/local/lib/python3.9/dist-packages/iio.py", line 56, in _check_null
raise OSError(err, _strerror(err))
OSError: [Errno 22] Invalid argument

<<<<<<<<<<<<<<<<<<<<<<<<<

Traceback (most recent call last):
File "/home/analog/rpi_ad7476/ad7476.py", line 63, in
data = ADC.rx()
File "/home/analog/.local/lib/python3.9/site-packages/adi/rx_tx.py", line 295, in rx
data = self.__rx_non_complex()
File "/home/analog/.local/lib/python3.9/site-packages/adi/rx_tx.py", line 268, in __rx_non_complex
x = self.__rx_buffered_data()
File "/home/analog/.local/lib/python3.9/site-packages/adi/rx_tx.py", line 234, in __rx_buffered_data
self._rx_init_channels()
File "/home/analog/.local/lib/python3.9/site-packages/adi/rx_tx.py", line 197, in _rx_init_channels
self.__rxbuf = iio.Buffer(self._rxadc, self.__rx_buffer_size, False)
File "/usr/local/lib/python3.9/dist-packages/iio.py", line 981, in init
self._buffer = _create_buffer(device._device, samples_count, cyclic)
File "/usr/local/lib/python3.9/dist-packages/iio.py", line 56, in _check_null
raise OSError(err, _strerror(err))
OSError: [Errno 22] Invalid argument

[Travis F. Collins]

You need to enable valid channels in both cases before creating buffers. In the pyadi example you are enabling channel 1 which does not exist. Try enabling channel 0

[karu2003]

The problem is not the channel number. To test them, I have two channels and the voltage is on channel 1.
I switched to version 0.25.
There was a problem with permission denied.
i need to find a way to make this accessible to all users.

I installed the trigger manuel.
modprobe iio_trig_sysfs
cd /sys/bus/iio/devices/iio_sysfs_trigger
echo 123 > add_trigger
cd /sys/bus/iio/devices/trigger0
cat name # should give sysfstrig123
cd /sys/bus/iio/devices/iio:device0
echo sysfstrig123 > trigger/current_trigger
echo 1 > scan_elements/in_voltage0_en
echo 1 > buffer/enable

Now i have two problems. "High-speed mode not enabled" and "Connection timed out"

analog@analog:~/ad7476_025 $ /usr/bin/python3 /home/analog/ad7476_025/ad7476.py
WARNING: High-speed mode not enabled
Traceback (most recent call last):
File "/home/analog/ad7476_025/ad7476.py", line 99, in
data = ADC.rx()
File "/home/analog/.local/lib/python3.9/site-packages/adi/rx_tx.py", line 295, in rx
data = self.__rx_non_complex()
File "/home/analog/.local/lib/python3.9/site-packages/adi/rx_tx.py", line 268, in __rx_non_complex
x = self.__rx_buffered_data()
File "/home/analog/.local/lib/python3.9/site-packages/adi/rx_tx.py", line 235, in __rx_buffered_data
self.__rxbuf.refill()
File "/home/analog/.local/lib/python3.9/site-packages/iio.py", line 1003, in refill
_buffer_refill(self._buffer)
File "/home/analog/.local/lib/python3.9/site-packages/iio.py", line 62, in _check_negative
raise OSError(-result, _strerror(-result))
TimeoutError: [Errno 110] Connection timed out

[Travis F. Collins]

Before you changed to the dynamic changes here karu2003/rpi_ad7476@0eabfde you were indexing into an undefined channel. Be aware with dynamic channels there is no guarantee of channel ordering.

For the other two issues, your device does not support high speed mode so you can do anything. Please ignore the warning. As for the timeout, you likely need to configure a trigger for the device during the init

[karu2003]

Before christmas I figured out how to use a trigger and a buffer. :)
https://github.com/karu2003/rpi_ad7476