Serial Wombat Arduino Library

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SerialWombatDebouncedInput Class Reference

A pin mode class that debounces inputs. More...

`#include <SerialWombatDebouncedInput.h>`

Inheritance diagram for SerialWombatDebouncedInput:
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Collaboration diagram for SerialWombatDebouncedInput:
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## Public Member Functions
| SerialWombatDebouncedInput (SerialWombatChip &serialWombatChip)
| Constructor for the SerialWombatDebouncedInput class.
int16_t | begin (uint8_t pin, uint16_t debounce_mS=30, bool invert=true, bool usePullUp=true)
| Initialize a debounced input.
bool | digitalRead ()
| Returns the debounced state of the input.
uint16_t | readDurationInTrueState_mS ()
| return the number of mS that the input has been in true state
uint16_t | readDurationInFalseState_mS ()
| return the number of mS that the input has been in false state
bool | readTransitionsState (bool resetTransitionCounts=true)
| Queries the number of transistions that have occured on the debounced input.
Public Member Functions inherited from SerialWombatAbstractButton
| SerialWombatAbstractButton ()
Public Member Functions inherited from SerialWombatPin
| SerialWombatPin (SerialWombatChip &serialWombatChip)
| Instantiates a Serial Wombat Pin.
| SerialWombatPin (SerialWombatChip &serialWombatChip, uint8_t pin)
| Instantiates a Serial Wombat Pin.
uint16_t | readPublicData ()
| Read the 16 Bit public data associated with this pin.
void | pinMode (uint8_t mode, bool pullDown=false, bool openDrain=false)
| Set pin to INPUT or OUTPUT, with options for pull Ups and open Drain settings.
void | digitalWrite (uint8_t val)
| Set output pin High or Low.
int | digitalRead ()
| Reads the state of the Pin.
uint16_t | writePublicData (uint16_t value)
| Write a 16 bit value to this pin.
uint8_t | pin ()
| Returns the current SW pin number. Used primarily for virtual calls by derived classes.
uint8_t | swPinModeNumber ()
| Returns the Mode number. Used primarily by derived classes to populate packet data.
int16_t | initPacketNoResponse (uint8_t packetNumber, uint8_t param0=0x55, uint8_t param1=0x55, uint8_t param2=0x55, uint8_t param3=0x55, uint8_t param4=0x55)
int16_t | initPacketNoResponse (uint8_t packetNumber, uint16_t param0=0x55, uint8_t param1=0x55, uint8_t param2=0x55, uint8_t param3=0x55)
int16_t | initPacketNoResponse (uint8_t packetNumber, uint16_t param0, uint16_t param1, uint8_t param2=0x55)
int16_t | disable ()
| Disables the pin mode (if applicable)
int16_t | enablePullup (bool enabled)
| Enables the weak pull up on a pin. Implemented on SW18AB and SW8B only.
int16_t | enablePulldown (bool enabled)
| Enables the weak pull down on a pin. Implemented on SW18AB and SW8B only.
int16_t | enableOpenDrain (bool enabled)
| Enables open drain mode on a pin. Implemented on SW18AB and SW8B only.
int16_t | forceDMA (bool enabled)
| Forces use of DMA instead of hardware timing resources on SW18AB.

## Additional Inherited Members
Public Attributes inherited from SerialWombatAbstractButton
uint16_t | transitions = 0
| Number of transitions returned by last call to readTransitionsState()
Protected Attributes inherited from SerialWombatPin
uint8_t | _pin = 255
SerialWombatChip & | _sw
uint8_t | _pinMode = 0

## Detailed Description

A pin mode class that debounces inputs.

The SerialWombatDebouncedInput class is used to debounce inputs such as switches.

See the example sw4b_ard_Debounce1 distributed with the Serial Wombat Arduino Library for an example.

Video Tutorial

https://youtu.be/R1KM0J2Ug-M

One SerialWombatDebouncedInput instance should be declared per debounced input.

The class sends commands and reads data from the Serial Wombat. The actual switch debouncing algorithm runs on the Serial Wombat.

The Serial Wombat's firmware algorithm polls the input every 1mS. After it has been different from the reported value for X consecutive mS, the reported value changes to the new polled value. The number of mS required for a change can be configured.

The Debounced Input mode keeps track of how long the debounced result has been in the current state (up to 65535 mS) and can report this to the host. This is useful for implementing user interfaces that react based on how long a button has been held.

The Debounced Input mode keeps track of how many transitions have occured. This can be used to poll the Debounced Input infrequently for status, but still process all button presses/releases that occured since the last poll.

The pin mode has weak pull-up circuitry availble, and the ability to report inverted values. These are both enabled when the simpliest begin() call is used, allowing buttons that switch the Serial Wombat pin to ground to be used without additional hardware.

See also the SerialWombatButtonCounter class which can run on top of this one.

Definition at line 74 of file SerialWombatDebouncedInput.h.

## Constructor & Destructor Documentation

## ◆ SerialWombatDebouncedInput()

SerialWombatDebouncedInput::SerialWombatDebouncedInput | ( | SerialWombatChip & | serialWombatChip | ) |
| inline

Constructor for the SerialWombatDebouncedInput class.

Parameters

  serialWombat | a reference to the Serial Wombat on which the Debounced Input will exist

Definition at line 82 of file SerialWombatDebouncedInput.h.

## Member Function Documentation

## ◆ begin()

int16_t SerialWombatDebouncedInput::begin | ( | uint8_t | pin,
|  | uint16_t | debounce_mS = 30,
|  | bool | invert = true,
|  | bool | usePullUp = true )
| inline

Initialize a debounced input.

Parameters

  pin | The Serial Wombat pin used for the debounced input
  debounce_mS | number of mS the pin must be stable to cause a transition
  invert | FALSE: pin reading is returned TRUE: inverted pin reading is returned
  usePullUp | Whether the pin's weak pull up is enabled

Definition at line 93 of file SerialWombatDebouncedInput.h.

## ◆ digitalRead()

bool SerialWombatDebouncedInput::digitalRead | ( |  | ) |
| inline virtual

Returns the debounced state of the input.

This function reads from the public data of the pin which indicates the debounced and invert adjusted state of the input

Returns
  TRUE or FALSE. Meaning depends on inversion setting

Implements SerialWombatAbstractButton.

Definition at line 108 of file SerialWombatDebouncedInput.h.

## ◆ readDurationInFalseState_mS()

uint16_t SerialWombatDebouncedInput::readDurationInFalseState_mS | ( |  | ) |
| inline virtual

return the number of mS that the input has been in false state

Note that this value starts incrementing after any debounce period, not after the physical pin transition.

Returns
  returns a value in mS which saturates at 65535. Returns 0 if currently true.

Implements SerialWombatAbstractButton.

Definition at line 145 of file SerialWombatDebouncedInput.h.

## ◆ readDurationInTrueState_mS()

uint16_t SerialWombatDebouncedInput::readDurationInTrueState_mS | ( |  | ) |
| inline virtual

return the number of mS that the input has been in true state

Note that this value starts incrementing after the debounce period, not after the physical pin transition.

Returns
  returns a value in mS which saturates at 65535. Returns 0 if currently false.

Implements SerialWombatAbstractButton.

Definition at line 120 of file SerialWombatDebouncedInput.h.

## ◆ readTransitionsState()

bool SerialWombatDebouncedInput::readTransitionsState | ( | bool | resetTransitionCounts = true | ) |
| inline virtual

Queries the number of transistions that have occured on the debounced input.

This function queries the debounced input for current state and transitions since last call. transition count is put in the global member transitions. The debounced input in the Serial Wombat resets its count to zero after this call.

Returns
  TRUE or FALSE, current status of debounced input

Implements SerialWombatAbstractButton.

Definition at line 173 of file SerialWombatDebouncedInput.h.