ad7606 tweaks and updates #590
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tfcollins
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Aug 22, 2024
adi/ad7606.py
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| return ret | ||
| return None |
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If replacing with returns you can omit last line. Python always returns None if there is no explicit return statement
tfcollins
reviewed
Aug 22, 2024
adi/ad7606.py
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| # We can't detect SW mode, so we use a try block | ||
| try: | ||
| return self._get_iio_attr_str(self.name, "scale_available", False) | ||
| except: |
With the upstream Linux version, the oversampling, oversampling_ratio attributes are available at device level. _get_iio_attr() is used for accessing channel attributes. Signed-off-by: Alexandru Ardelean <[email protected]>
There seems to be a confusion between scale and range. In the case of AD7606, the range (specified in the datasheet) determines the scale of the device (or the channel in some cases). Signed-off-by: Alexandru Ardelean <[email protected]>
Signed-off-by: Alexandru Ardelean <[email protected]>
The AD7606C-16 and AD7606C-18 support per-channel 'scale_availble' in SW mode. That is because each channel can be configured individually, to be bipolar-differential, bipolar-single-ended or unipolar-single-ended. Depending on the above configuration, the available scales change. So, we need to tweak this per-channel. Since there isn't a way to detect SW mode, we use some 'try' blocks in Python. Signed-off-by: Alexandru Ardelean <[email protected]>
For AD7606C-18 especially, there will be 32-bit samples getting returned from the ADC. Signed-off-by: Alexandru Ardelean <[email protected]>
The soft timestamp channel is a special IIO channel. It's not an RX channel, so it hasn't any of the typically attributes (raw, scale, etc) like the other RX channels. So, just ignore it. Signed-off-by: Alexandru Ardelean <[email protected]>
At least the 'raw' channel attribute returns int. So, 'ad7606.to_volts(0, channel0.raw)' won't work with checking for numpy types. Signed-off-by: Alexandru Ardelean <[email protected]>
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Description
This changeset mostly targets support for the AD7606C-18 and AD7606C-16 parts.
The upstream support for these parts is pending here:
https://lore.kernel.org/linux-iio/[email protected]/T/#t
But there were a couple of fixes required for existing parts.
For one thing the oversampling attributes need to be made device-level attributes.
There are no 'range' attributes. These are scale attributes.
Fixes # (issue)
Type of change
Please delete options that are not relevant.
How has this been tested?
Tested with a ZedBoard and an AD7606C-18 FMC board.
The HDL is a simplified version that uses the Zynq PS SPI controller, which kind of like using the AD7606 part directly connected to a simple RPi board; no fancy communication.
Test Configuration:
Documentation
If this is a new feature or example please mention or link any documentation. All new hardware interface classes require documentation.
Checklist: