kopia lustrzana https://github.com/micropython/micropython
62 wiersze
2.0 KiB
ReStructuredText
62 wiersze
2.0 KiB
ReStructuredText
.. currentmodule:: machine
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.. _machine.ADCBlock:
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class ADCBlock -- control ADC peripherals
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=========================================
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The ADCBlock class provides access to an ADC peripheral which has a
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number of channels that can be used to sample analog values. It allows
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finer control over configuration of :ref:`machine.ADC <machine.ADC>`
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objects, which do the actual sampling.
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This class is not always available.
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Example usage::
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from machine import ADCBlock
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block = ADCBlock(id, bits=12) # create an ADCBlock with 12-bit resolution
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adc = block.connect(4, pin) # connect channel 4 to the given pin
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val = adc.read_uv() # read an analog value
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Constructors
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------------
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.. class:: ADCBlock(id, *, bits)
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Access the ADC peripheral identified by *id*, which may be an integer
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or string.
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The *bits* argument, if given, sets the resolution in bits of the
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conversion process. If not specified then the previous or default
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resolution is used.
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Methods
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-------
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.. method:: ADCBlock.init(*, bits)
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Configure the ADC peripheral. *bits* will set the resolution of the
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conversion process.
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.. method:: ADCBlock.connect(channel, *, ...)
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ADCBlock.connect(source, *, ...)
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ADCBlock.connect(channel, source, *, ...)
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Connect up a channel on the ADC peripheral so it is ready for sampling,
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and return an :ref:`ADC <machine.ADC>` object that represents that connection.
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The *channel* argument must be an integer, and *source* must be an object
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(for example a :ref:`Pin <machine.Pin>`) which can be connected up for sampling.
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If only *channel* is given then it is configured for sampling.
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If only *source* is given then that object is connected to a default
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channel ready for sampling.
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If both *channel* and *source* are given then they are connected together
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and made ready for sampling.
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Any additional keyword arguments are used to configure the returned ADC object,
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via its :meth:`init <machine.ADC.init>` method.
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