B4R Code Snippet Button processing class: press, short click, long click, periodic event

The module for working with buttons (GND connected buttons now tested only).

Main: 
#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 600
#End Region

Sub Process_Globals
    Public Serial1 As Serial
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Delay(3000)
    Log("AppStart")
 
    Dim p As Pin
    esp32_buttons.Initialize    'setup esp32_buttons.buttons() and pins() first !
    esp32_buttons.AddButton(12, p.MODE_INPUT_PULLUP)
    esp32_buttons.AddButton(13, p.MODE_INPUT_PULLUP)
    Log("Try to click button !")
End Sub

Module: esp32_buttons: 
'module name: esp32_buttons
'v0.142 (c) Peacemaker
Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Private Const BUTTON_PRESS_TIME As UInt = 60
    Private Const SHORT_CLICK_INTERVAL As UInt = 100
    Private Const LONG_CLICK_INTERVAL As UInt = 700
    Private Const PERIODIC_INTERVAL As UInt = 500
    Private Const POLL_INTERVAL As UInt = 20
  
    Type ButtonState (index As Byte, lastState As Boolean, currentState As Boolean, lastDebounceTime As ULong, pressStartTime As ULong, pressDuration As ULong, eventGenerated As Boolean, periodicCounter As UInt, pressEventTime As ULong, lastPeriodicTime As ULong, initialized As Boolean)
  
    Private buttons(2) As ButtonState   'setup exactly needed qty to avoid crash!
    Private pins(2) As Pin    'setup exactly needed qty to avoid crash!
    Private ButtonsIndex As Byte
    Private timer1 As Timer
End Sub

' Initialize module
Public Sub Initialize
    ButtonsIndex = 0
    timer1.Initialize("CheckButtons_Tick", POLL_INTERVAL)
    timer1.Enabled = True
    Log("Buttons initialized")
End Sub

' Add new button
Public Sub AddButton(gpio_num As Byte, pin_mode As Byte)
    pins(ButtonsIndex).Initialize(gpio_num, pin_mode)
    buttons(ButtonsIndex).index = ButtonsIndex
    buttons(ButtonsIndex).lastState = True ' assuming pull-up, so default is HIGH
    buttons(ButtonsIndex).currentState = True
    buttons(ButtonsIndex).lastDebounceTime = 0
    buttons(ButtonsIndex).pressStartTime = 0
    buttons(ButtonsIndex).pressDuration = 0
    buttons(ButtonsIndex).eventGenerated = False
    buttons(ButtonsIndex).periodicCounter = 0
    buttons(ButtonsIndex).pressEventTime = 0
    buttons(ButtonsIndex).lastPeriodicTime = 0
    buttons(ButtonsIndex).initialized = False
  
    ' Check initial state
    Dim initialReading As Boolean = pins(ButtonsIndex).DigitalRead
    If pin_mode = pins(ButtonsIndex).MODE_INPUT_PULLUP And initialReading = False Then
        ' Button is pressed at initialization
        buttons(ButtonsIndex).currentState = False
        buttons(ButtonsIndex).pressStartTime = Millis
        buttons(ButtonsIndex).pressEventTime = Millis
        Log("Button(", gpio_num, ") INITIAL event: press (0ms)")
    End If
  
    buttons(ButtonsIndex).initialized = True
    Log("Button added with GPIO ", gpio_num)
    ButtonsIndex = ButtonsIndex + 1
End Sub

' Main button check loop
Private Sub CheckButtons_Tick
    For i = 0 To buttons.Length - 1
        If buttons(i).initialized Then
            ProcessButton(buttons(i))
        End If
    Next
End Sub

' Process single button state
Private Sub ProcessButton(btn As ButtonState)
    Dim gpio_num As Byte = pins(btn.index).PinNumber
    Dim reading As Boolean = pins(btn.index).DigitalRead
    Dim currentTime As ULong = Millis
  
    ' Debounce logic
    If reading <> btn.lastState Then
        btn.lastDebounceTime = currentTime
    End If
  
    If (currentTime - btn.lastDebounceTime) > BUTTON_PRESS_TIME Then
        ' State has actually changed
        If reading <> btn.currentState Then
            btn.currentState = reading
          
            ' Button pressed (falling edge for pull-up)
            If btn.currentState = False Then
                btn.pressStartTime = currentTime
                btn.pressEventTime = currentTime 'zero point for events
                btn.pressDuration = 0
                btn.eventGenerated = False
                btn.periodicCounter = 0
                btn.lastPeriodicTime = currentTime
                Log("Button(", gpio_num, ") event: press (0ms)")
            Else
                btn.pressDuration = currentTime - btn.pressStartTime
                Dim timeSincePress As ULong = currentTime - btn.pressEventTime
              
                If btn.pressDuration >= BUTTON_PRESS_TIME And btn.pressDuration >= SHORT_CLICK_INTERVAL And btn.pressDuration < LONG_CLICK_INTERVAL Then
                    Log("Button(", gpio_num, ") event: short_click (", timeSincePress, "ms since press)")
                End If
                If btn.pressDuration >= LONG_CLICK_INTERVAL And btn.periodicCounter = 0 Then
                    Log("Button(", gpio_num, ") event: long_click (", timeSincePress, "ms since press)")
                End If
              
                btn.pressStartTime = 0
                btn.pressEventTime = 0
                btn.eventGenerated = False
                btn.periodicCounter = 0
                btn.lastPeriodicTime = 0
            End If
        End If
      
        ' Handle button being held down
        If btn.currentState = False And btn.pressStartTime > 0 Then
            Dim duration As ULong = currentTime - btn.pressStartTime
  
            ' Check for periodic events only after triple LONG_CLICK_INTERVAL
            If duration >= 3 * LONG_CLICK_INTERVAL Then
                ' Calculate expected time for next periodic event
                Dim expectedTime As ULong = LONG_CLICK_INTERVAL + (btn.periodicCounter * PERIODIC_INTERVAL)
      
                ' Only trigger if current time reached expected time
                If currentTime >= expectedTime And (currentTime - btn.lastPeriodicTime) >= (PERIODIC_INTERVAL) Then
                    Dim timeSinceLastPeriodic As ULong = currentTime - btn.lastPeriodicTime
                    Log("Button(", gpio_num, ") event: periodic (", timeSinceLastPeriodic, "ms since last event)")
                    btn.periodicCounter = btn.periodicCounter + 1
                    btn.lastPeriodicTime = currentTime
                End If
            End If
        End If
    End If
  
    btn.lastState = reading
End Sub

New upload port: COM14 (serial)
AppStart
Buttons initialized
Button added with GPIO 0
Button added with GPIO 2
Try to click button !
Button(0) event: press (0ms)
Button(0) event: short_click (160ms since press)
Button(2) event: press (0ms)
Button(2) event: short_click (180ms since press)
Button(0) event: press (0ms)
Button(2) event: press (0ms)
Button(0) event: short_click (480ms since press)
Button(2) event: long_click (820ms since press)
Button(0) event: press (0ms)
Button(2) event: press (0ms)
Button(0) event: periodic (2100ms since last event)
Button(2) event: periodic (2100ms since last event)
Button(0) event: periodic (500ms since last event)
Button(2) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Button(2) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Button(2) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Button(2) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Click to expand...

upd. v.142 is added:
* 5th event is added: "INITIAL event", if the button is pressed before initialization. Project v.0.142 is attached additionally, below the log when Button(1) long-click is sending MCU into DeepSleep with waking up by Button(0):

B4X: 
                If btn.pressDuration >= LONG_CLICK_INTERVAL And btn.periodicCounter = 0 Then
                    Log("Button(", gpio_num, ") event: long_click (", timeSincePress, "ms since press)")
                    If btn.index = 1 Then
                        Log("Sleep by second button")
                        Main.ESP.DeepSleepWakeUpByPin(0, 0)
                    End If
                End If



AppStart
Buttons initialized
Button added with GPIO 0
Button added with GPIO 1
Try to click button !
Button(1) event: press (0ms)
Button(1) event: long_click (1360ms since press)
Sleep by second button
AppStart
Buttons initialized
Button(0) INITIAL event: press (0ms)
Button added with GPIO 0
Button added with GPIO 1
Try to click button !
Button(0) event: periodic (7351ms since last event)
Button(0) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Button(0) event: periodic (500ms since last event)
Click to expand...
 

Attachments

  • esp32_buttons_0.141!.zip
    2.5 KB · Views: 43
  • esp32_buttons_0.142.zip
    2.6 KB · Views: 37
Last edited:
Click to expand...
peacemaker

peacemaker

Expert
Licensed User
Longtime User
upd. v.142 is added:
* 5th event is added: "INITIAL event"
 
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