Control Surface master MIDI Control Surface library for Arduino
GenericFilteredAnalog< MappingFunction, Precision, FilterShiftFactor, FilterType, AnalogType, IncRes > Class Template Reference

#include <AH/Hardware/FilteredAnalog.hpp>

## Detailed Description

template<class MappingFunction, uint8_t Precision = 10, uint8_t FilterShiftFactor = ANALOG_FILTER_SHIFT_FACTOR, class FilterType = ANALOG_FILTER_TYPE, class AnalogType = analog_t, uint8_t IncRes = MaximumFilteredAnalogIncRes< FilterShiftFactor, FilterType, AnalogType>::value>
class AH::GenericFilteredAnalog< MappingFunction, Precision, FilterShiftFactor, FilterType, AnalogType, IncRes >

FilteredAnalog base class with generic MappingFunction.

FilteredAnalog

Definition at line 39 of file FilteredAnalog.hpp.

Collaboration diagram for GenericFilteredAnalog< MappingFunction, Precision, FilterShiftFactor, FilterType, AnalogType, IncRes >:

## Public Member Functions

GenericFilteredAnalog (pin_t analogPin, MappingFunction mapFn, AnalogType initial=0)
Construct a new GenericFilteredAnalog object. More...

void reset (AnalogType value=0)
Reset the filter to the given value. More...

void resetToCurrentValue ()
Reset the filtered value to the value that's currently being measured at the analog input. More...

void map (MappingFunction fn)
Specify a mapping function/functor that is applied to the analog value after filtering and before applying hysteresis. More...

MappingFunctiongetMappingFunction ()
Get a reference to the mapping function. More...

const MappingFunctiongetMappingFunction () const
Get a reference to the mapping function. More...

bool update ()

AnalogType getValue () const
Get the filtered value of the analog input (with the mapping function applied). More...

float getFloatValue () const
Get the filtered value of the analog input with the mapping function applied as a floating point number from 0.0 to 1.0. More...

AnalogType getRawValue () const
Read the raw value of the analog input without any filtering or mapping applied, but with its bit depth increased by IncRes. More...

## Static Public Member Functions

static constexpr AnalogType getMaxRawValue ()
Get the maximum value that can be returned from getRawValue. More...

Select the configured ADC resolution. More...

## Private Types

using EMA_t = EMA< FilterShiftFactor, AnalogType, FilterType >

## Private Member Functions

template<typename M = MappingFunction>
std::enable_if< std::is_constructible< bool, M >::value, AnalogType >::type mapFnHelper (AnalogType input)
Helper function that applies the mapping function if it's enabled. More...

template<typename M = MappingFunction>
std::enable_if<!std::is_constructible< bool, M >::value, AnalogType >::type mapFnHelper (AnalogType input)
Helper function that applies the mapping function without checking if it's enabled. More...

## Private Attributes

pin_t analogPin

MappingFunction mapFn

EMA_t filter

Hysteresis< ADC_BITS+IncRes - Precision, AnalogType, AnalogType > hysteresis

## ◆ EMA_t

 using EMA_t = EMA
private

Definition at line 211 of file FilteredAnalog.hpp.

## ◆ GenericFilteredAnalog()

 GenericFilteredAnalog ( pin_t analogPin, MappingFunction mapFn, AnalogType initial = 0 )
inline

Construct a new GenericFilteredAnalog object.

Parameters
 analogPin The analog pin to read from. mapFn The mapping function initial The initial value of the filter.

Definition at line 51 of file FilteredAnalog.hpp.

## ◆ reset()

 void reset ( AnalogType value = 0 )
inline

Reset the filter to the given value.

Parameters
 value The value to reset the filter state to.

Definition at line 66 of file FilteredAnalog.hpp.

## ◆ resetToCurrentValue()

 void resetToCurrentValue ( )
inline

Reset the filtered value to the value that's currently being measured at the analog input.

This is useful to avoid transient effects upon initialization.

Definition at line 79 of file FilteredAnalog.hpp.

## ◆ map()

 void map ( MappingFunction fn )
inline

Specify a mapping function/functor that is applied to the analog value after filtering and before applying hysteresis.

Parameters
 fn This functor should have a call operator that takes the filtered value (of ADC_BITS + IncRes bits wide) as a parameter, and returns a value of ADC_BITS + IncRes bits wide.
Note
Applying the mapping function before filtering could result in the noise being amplified to such an extent that filtering it afterwards would be ineffective.
Applying it after hysteresis would result in a lower resolution.
That's why the mapping function is applied after filtering and before hysteresis.

Definition at line 101 of file FilteredAnalog.hpp.

## ◆ getMappingFunction() [1/2]

 MappingFunction & getMappingFunction ( )
inline

Get a reference to the mapping function.

Definition at line 106 of file FilteredAnalog.hpp.

## ◆ getMappingFunction() [2/2]

 const MappingFunction & getMappingFunction ( ) const
inline

Get a reference to the mapping function.

Definition at line 110 of file FilteredAnalog.hpp.

## ◆ update()

 bool update ( )
inline

Return values
 true The value changed since last time it was updated. false The value is still the same.

Definition at line 121 of file FilteredAnalog.hpp.

## ◆ getValue()

 AnalogType getValue ( ) const
inline

Get the filtered value of the analog input (with the mapping function applied).

Note
This function just returns the value from the last call to update, it doesn't read the analog input again.
Returns
The filtered value of the analog input, as a number of Precision bits wide.

Definition at line 139 of file FilteredAnalog.hpp.

## ◆ getFloatValue()

 float getFloatValue ( ) const
inline

Get the filtered value of the analog input with the mapping function applied as a floating point number from 0.0 to 1.0.

Returns
The filtered value of the analog input, as a number from 0.0 to 1.0.

Definition at line 148 of file FilteredAnalog.hpp.

## ◆ getRawValue()

 AnalogType getRawValue ( ) const
inline

Read the raw value of the analog input without any filtering or mapping applied, but with its bit depth increased by IncRes.

Definition at line 156 of file FilteredAnalog.hpp.

## ◆ getMaxRawValue()

 static constexpr AnalogType getMaxRawValue ( )
inlinestaticconstexpr

Get the maximum value that can be returned from getRawValue.

Definition at line 168 of file FilteredAnalog.hpp.

inlinestatic

By default, it is set to the maximum resolution supported by the hardware.

Definition at line 179 of file FilteredAnalog.hpp.

## ◆ mapFnHelper() [1/2]

 std::enable_if< std::is_constructible< bool, M >::value, AnalogType >::type mapFnHelper ( AnalogType input )
inlineprivate

Helper function that applies the mapping function if it's enabled.

This function is only enabled if MappingFunction is explicitly convertible to bool.

Definition at line 192 of file FilteredAnalog.hpp.

## ◆ mapFnHelper() [2/2]

 std::enable_if::value, AnalogType >::type mapFnHelper ( AnalogType input )
inlineprivate

Helper function that applies the mapping function without checking if it's enabled.

This function is only enabled if MappingFunction is not convertible to bool.

Definition at line 203 of file FilteredAnalog.hpp.

## ◆ analogPin

 pin_t analogPin
private

Definition at line 208 of file FilteredAnalog.hpp.

## ◆ mapFn

 MappingFunction mapFn
private

Definition at line 209 of file FilteredAnalog.hpp.

## ◆ filter

 EMA_t filter
private

Definition at line 225 of file FilteredAnalog.hpp.

## ◆ hysteresis

 Hysteresis hysteresis
private

Definition at line 227 of file FilteredAnalog.hpp.

The documentation for this class was generated from the following file: