main.cpp

00001 
00002 /* Library:     Hotboards_switches.h
00003  * Project:     dipsw_change
00004  * File:        main.cpp
00005  * Author:      Diego Perez
00006  * Modified by: Roman Valencia 
00007  * Contact:     http://www.hotboards.org/
00008  *
00009  * Read an entire dip switch composed by 8 interrupts, only when it changes its value
00010  */
00011 
00012 #include "mbed.h"
00013 #include "Hotboards_switches.h"
00014 
00015 // Creates a single sw object composed by 8 interrupts. theses interrupts will give us a
00016 // LOW(0) value when close because our dip switch works with pull-ups.
00017 Hotboards_switches dip_sw( PA_6 , PA_7 , PB_6 , PC_7 , PA_9 , PA_8 , PB_10 , PB_4 );
00018 // If your dip switch will gave you a HIGH(1) value when close, then we need to create the sw
00019 // object with an extra parameter: 
00020 // Hotboards_switches dip_sw( PA_6 , PA_7 , PB_6 , PC_7 , PA_9 , PA_8 , PB_10 , PB_4 , 1 );
00021 // In any case the functions will return a HIGH(1) value any time the sw is closed
00022 
00023 // For this example we will use the USB serial port, here we initialize it
00024 Serial pc(USBTX,USBRX);
00025 
00026 int i, j;
00027 uint8_t value;
00028 
00029 int main()
00030 {
00031     while(1)
00032     {
00033         if( dip_sw.hasItChange( ) )
00034         {
00035             // Reads the dip switch and puts it in value
00036             value = dip_sw.read();
00037             // Inverts the read value to make it coincide with the state of each
00038             // switch in binary
00039             value = ~value;
00040             // Sends throught USB serial the value in decimal
00041             pc.printf( "dec = " );
00042             pc.printf( "%d\r" , value );
00043             // Sends through USB serial the value in binary
00044             pc.printf( "bin = " );
00045             for(i=0;i<8;i++)            //Extracts and shows the binary value of each sw
00046             { 
00047                 j = value&0x80;         //Applies a mask(10000000) to extract the value of the bit in turn
00048                 j>>=7;                  //Moves this bit 7 positions to the right
00049                 pc.printf("%d",j);      //Sends through USB serial the value of the extracted bit
00050                 value <<=1;             //Moves the position 1 bit to the left to extract the next bit
00051             }
00052             pc.printf( "\n\r" );
00053             wait_ms( 250 );
00054         }
00055     }
00056 }