main.cpp

00001 
00002 /* Library:     Hotboards_switches.h
00003  * Project:     input_change
00004  * File:        main.cpp
00005  * Author:      Diego Perez
00006  * Modified by: Roman Valencia 
00007  * Contact:     http://www.hotboards.org/
00008  *
00009  * Reads an input on pin PB_4, only when its value has been changed
00010  */
00011  
00012 #include "mbed.h"
00013 #include "Hotboards_switches.h"
00014 
00015 // Creates a single sw object, this interrupt will give us a LOW(0) value when close
00016 // because our dip switch works with pull-ups
00017 Hotboards_switches sw( PB_4 );
00018 // If your dip switch will gave you a HIGH(1) value when close, then we need to create
00019 // the sw object with an extra parameter: Hotboards_switches sw( PB_4 , 1 );
00020 // In any case the function will return a HIGH(1) value any time the sw is closed
00021 
00022 // For this example we will use the USB serial port, here we initialize it
00023 Serial pc(USBTX,USBRX);
00024 
00025 int main()
00026 {
00027     while(1)
00028     {
00029         //Asks when the interrupt changes its value
00030         if( sw.hasItChange( ) )
00031         {
00032             // When the interrupt is close (or ON) the function will return a true value
00033             // it doesn´t matter if our input is configured with pull-ups(LOW) or
00034             // pull-downs(HIGH)
00035             if( sw.read( ) )
00036             {
00037                 pc.printf( "sw = close (on)\n\r" );
00038             }
00039             else
00040             {
00041                 pc.printf( "sw = open (off)\n\r" );
00042             }
00043             // Wait 250 ms, just to not query so often
00044             wait_ms( 250 );
00045         }
00046     }
00047 }