Diff: menbed/menbedButtonHandler.cpp

Revision:

0:936f1c020120

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/menbed/menbedButtonHandler.cpp	Wed Sep 05 07:21:59 2012 +0000
@@ -0,0 +1,201 @@
+#include "mbed.h"
+#include "include/menbedNavigator.h"
+#include "include/menbedButtonHandlerTimespec.h"
+#include "include/menbedButtonHandler.h"
+
+MenbedButtonHandler::MenbedButtonHandler (PinName selectPin, PinName downPin, 
+    PinName upPin, PinName cancelPin, MenbedButtonHandlerTimespec *timespec,
+    MenbedNavigator *navigator) : 
+    //select(select), down(down), up(up), cancel(cancel),
+    timespec(timespec), navigator(navigator)
+{
+    select = new DigitalIn(selectPin);
+    down = new DigitalIn(downPin);
+    up = new DigitalIn(upPin);
+    cancel = new DigitalIn(cancelPin);
+
+    numButtons = 4;
+    
+    select->mode (PullDown);
+    down->mode (PullDown);
+    up->mode (PullDown);
+    cancel->mode (PullDown);
+    
+    init();
+}
+
+
+MenbedButtonHandler::MenbedButtonHandler (PinName selectPin, PinName downPin, 
+    PinName upPin, MenbedButtonHandlerTimespec *timespec,
+    MenbedNavigator *navigator) :
+    timespec(timespec), navigator(navigator)
+{
+    select = new DigitalIn(selectPin);
+    down = new DigitalIn(downPin);
+    up = new DigitalIn(upPin);
+
+    numButtons = 3;
+    
+    select->mode (PullDown);
+    down->mode (PullDown);
+    up->mode (PullDown);
+    
+    init();
+}
+
+
+MenbedButtonHandler::MenbedButtonHandler (PinName selectPin, PinName downPin, 
+    MenbedButtonHandlerTimespec *timespec,
+    MenbedNavigator *navigator) : 
+    timespec(timespec), navigator(navigator)
+{
+    select = new DigitalIn(selectPin);
+    down = new DigitalIn(downPin);
+
+    numButtons = 2;
+    
+    select->mode (PullDown);
+    down->mode (PullDown);
+    
+    init();
+}
+
+
+void MenbedButtonHandler::init()
+{
+    for (int i=0; i<4; i++)
+    {
+        buttonDebounced[i] = false;
+        buttonAlreadyDepressed[i] = false;
+    }
+    
+    currentTime_us = 0;
+    ticker.attach_us (this, &MenbedButtonHandler::tick, 
+        timespec->scanPeriod_us);
+}
+
+
+void MenbedButtonHandler::tick (void)
+{
+    // Accumulated amount of time that buttons have been continuously depressed
+    uint32_t buttonDepressedTime_us;
+    bool buttonCurrentlyDepressed;
+    
+    MenbedButtonEvent buttonEvent;
+    buttonEvent.numButtons = numButtons;
+    
+    currentTime_us += timespec->scanPeriod_us;
+
+    // Cycle through each of the buttons
+    for (int i=MenbedButtonEvent::ButtonSelect; 
+        (i<=MenbedButtonEvent::ButtonCancel) && (i<numButtons);
+        i++)
+    {
+        buttonEvent.name = (MenbedButtonEvent::ButtonName)i;
+        buttonCurrentlyDepressed = 
+            isButtonDepressed((MenbedButtonEvent::ButtonName)i);
+
+        // The amount of time the current button has been depressed is
+        // the current time minus the time which the button was first
+        // depressed.
+        buttonDepressedTime_us = currentTime_us - buttonPushedTime_us[i];
+
+        if (buttonCurrentlyDepressed && buttonAlreadyDepressed[i])
+        {
+            if ((buttonDepressedTime_us >= timespec->typematicX10Delay_us) &&
+                    (currentTime_us - buttonLastTypematicTime_us[i] >=
+                        timespec->typematicX10Period_us ))
+            {
+                buttonLastTypematicTime_us[i] = currentTime_us;
+                buttonEvent.action = MenbedButtonEvent::BUTTON_ACTION_PUSHED;
+                navigator->handleButtonEvent (buttonEvent);
+            }
+            else if ((buttonDepressedTime_us >=
+                    timespec->typematicPeriod_us)
+                    && (currentTime_us - buttonLastTypematicTime_us[i] >=
+                            timespec->typematicPeriod_us))
+            {
+                buttonLastTypematicTime_us[i] = currentTime_us;
+                buttonEvent.action = MenbedButtonEvent::BUTTON_ACTION_PUSHED;
+                navigator->handleButtonEvent (buttonEvent);
+            }
+            else if ((buttonDepressedTime_us >= timespec->debounceDelay_us)
+                    && (!buttonDebounced[i]))
+            {
+                buttonLastTypematicTime_us[i] = currentTime_us;
+                buttonDebounced[i] = true;
+                buttonEvent.action = MenbedButtonEvent::BUTTON_ACTION_PUSHED;
+                navigator->handleButtonEvent (buttonEvent);
+            }
+
+            if (buttonDebounced[i] &&
+                    (buttonDepressedTime_us >= 
+                        timespec->longReleaseDelay_us))
+            {
+                buttonEvent.action = MenbedButtonEvent::BUTTON_ACTION_HELD_LONG;
+                navigator->handleButtonEvent (buttonEvent);
+            }
+
+            buttonAlreadyDepressed[i] = true;
+        }
+        // Otherwise, if the button was just depressed, we indicate that it
+        // has not yet debounced and record the time so that we know when it
+        // was first pressed.
+        else if (buttonCurrentlyDepressed && !buttonAlreadyDepressed[i])
+        {
+            buttonDebounced[i] = false;
+            buttonPushedTime_us[i] = currentTime_us;
+
+            buttonAlreadyDepressed[i] = true;
+        }
+        // Otherwise, if the button is not depressed but it was previously
+        // depressed and the amount of time it was depressed exceeds the
+        // debounce time, then we say the button has been released.
+        else if (!buttonCurrentlyDepressed && buttonAlreadyDepressed[i])
+        {
+            if (buttonDebounced[i])
+            {
+                if (buttonDepressedTime_us >=
+                        timespec->longReleaseDelay_us)
+                {
+                    buttonEvent.action = MenbedButtonEvent::BUTTON_ACTION_RELEASED_LONG;
+                    navigator->handleButtonEvent (buttonEvent);
+                }
+                else
+                {
+                    buttonEvent.action = MenbedButtonEvent::BUTTON_ACTION_RELEASED_SHORT;
+                       navigator->handleButtonEvent (buttonEvent);
+                }
+            }
+
+            buttonAlreadyDepressed[i] = false;
+        }
+    }
+}
+
+
+bool MenbedButtonHandler::isButtonDepressed (MenbedButtonEvent::ButtonName name)
+{
+    switch (name)
+    {
+    case MenbedButtonEvent::ButtonSelect:
+        return *select;
+    case MenbedButtonEvent::ButtonDown:
+        if (numButtons >= 2)
+            return *down;
+        else
+            return false;
+    case MenbedButtonEvent::ButtonUp:
+        if (numButtons >= 3)
+            return *up;
+        else
+            return false;
+    case MenbedButtonEvent::ButtonCancel:
+        if (numButtons == 4)
+            return *cancel;
+        else
+            return false;
+    }
+    
+    return false;
+}
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