examples: cn0554: change adc read function

[AndyOesmer]

Description

edit cn0554 example to use adc read raw instead of .rx function

Fixes # (issue)

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• New feature (non-breaking change which adds functionality)
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[tfcollins]

Why not just use the SI output type to do this for you? https://analogdevicesinc.github.io/pyadi-iio/buffers/index.html#buffer-units

[thorenscientific]

Why not just use the SI output type to do this for you? https://analogdevicesinc.github.io/pyadi-iio/buffers/index.html#buffer-units

This is less about the units than the nature of the application, which is typically a slow control loop - read channel A from AD7124, tweak channel A on the LTC2668, read ADC channel B, tweak channel B, etc. So rx-ing a big buffer of all channels doesn't make much sense. And rather than averaging readings from the buffered read, simply reduce the sampling frequency, which pushes the averaging into the ADC itself. That said - @AndyOesmer you could use the to_volts method:
https://github.com/analogdevicesinc/pyadi-iio/blob/main/adi/ad7124.py#L95
... but even that could use some cleanup, not sure where the if np.int16 comes from, this is a 24-bit part.
Another wrinkle - the AD7124 driver is being updated. It's going to be a while before it makes it into the Kuiper image, but we should be prepared to update the AD7124 pyadi, as well as all projects that use it (CN0554, CN0508, and make sure there are no others.)

[tfcollins]

Whats the final decision here @thorenscientific ?

[AndyOesmer]

Hi @tfcollins, @thorenscientific, apologies for the delayed response. I might opt to revise and use the to_volts method instead, as advised. Will update here once changes are applied. Thanks!