Silicon Labs / EFM32_CapSenseSlider

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Dependents:   EFM32 RDA5807M RDS Radio EMF32-Segment-Touch-Demo EFM32_Bugs MFALHIMOHAMMED ... more

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EFM32_CapSenseSlider Class Reference
Public Member Functions

EFM32_CapSenseSlider Class Reference

A driver for the capacitive touch slider on some EFM32 STKs. More...

#include <EFM32_CapSenseSlider.h>

Public Member Functions

 EFM32_CapSenseSlider ()
 Constructor.
void start ()
 Start measuring.
void stop ()
 Stop measuring.
void attach_touch (cbptr_t callback=NULL)
 Attach a callback handler, which gets called once on touch.
void attach_untouch (cbptr_t callback=NULL)
 Attach a callback handler, which gets called once on releasing touch.
void attach_slide (int32_t trip=-1, cbptr_t callback=NULL)
 Attach a callback which will trigger once the slider value passes a certain point.
bool isTouched ()
 Check whether the slider is currently being touched.
int32_t get_position ()
 Get the current position.

Detailed Description

A driver for the capacitive touch slider on some EFM32 STKs.

Currently supports EFM32 Wonder, Giant and Leopard Gecko kits.

 #include "mbed.h"
 #include "EFM32_CapSenseSlider.h"
 
 silabs::EFM32_CapSenseSlider capSlider;

 void touchCallback(void) {
   if(!capSlider.isTouched()) {
       printf("Lost touch");
   } else {
       printf("Finger detected! Position %d", capSlider.getPosition());
   }
 }
 
 int main() {
     capSlider.start();
     capSlider.attach_touch(touchCallback);
     
     while(1) sleep();
 }

Definition at line 75 of file EFM32_CapSenseSlider.h.

Constructor & Destructor Documentation

EFM32_CapSenseSlider (  )

Constructor.

Definition at line 42 of file EFM32_CapSenseSlider.cpp.

Member Function Documentation

void attach_slide ( int32_t  trip = -1,
cbptr_t  callback = NULL 
)

Attach a callback which will trigger once the slider value passes a certain point.

Parameters:
trippoint after which the callback gets called. If -1, the callback gets called on any change in position.
callbackpointer to a void (void) function. If null, then the callback gets disabled.

Definition at line 101 of file EFM32_CapSenseSlider.cpp.

void attach_touch ( cbptr_t  callback = NULL )

Attach a callback handler, which gets called once on touch.

Parameters:
callbackpointer to a void (void) function. If null, then the callback gets disabled.

Definition at line 83 of file EFM32_CapSenseSlider.cpp.

void attach_untouch ( cbptr_t  callback = NULL )

Attach a callback handler, which gets called once on releasing touch.

Parameters:
callbackpointer to a void (void) function. If null, then the callback gets disabled.

Definition at line 91 of file EFM32_CapSenseSlider.cpp.

int32_t get_position (  )

Get the current position.

Returns:
The finger position on the slider (0-48). -1 if not touched.

Definition at line 116 of file EFM32_CapSenseSlider.cpp.

bool isTouched (  )

Check whether the slider is currently being touched.

Returns:
True if a finger is currently detected.

Definition at line 109 of file EFM32_CapSenseSlider.cpp.

void start (  )

Start measuring.

Definition at line 59 of file EFM32_CapSenseSlider.cpp.

void stop (  )

Stop measuring.

Definition at line 71 of file EFM32_CapSenseSlider.cpp.

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