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