cardReader.h

00001 #include "mbed.h"
00002 //  Define the card reader input pins.
00003 DigitalIn cardBit1(p21);
00004 DigitalIn cardBit2(p22);
00005 DigitalIn cardBit3(p23);
00006 DigitalIn cardBit4(p24);
00007 DigitalIn cardBit5(p25);
00008 DigitalIn cardBit6(p26);
00009 DigitalIn cardDetect(p29);
00010 
00011 /*  cardAcquisition()
00012  *  Reads the binary values of the card reader inputs and converts them into a decimal number.
00013  *  The decimal number is returned as an integer.
00014  */
00015  
00016 int cardAcquisition(){
00017         //Work out the number of the card
00018         int cardNumber = 0;
00019         //Bit 1
00020         if(cardBit1) cardNumber += 1;
00021         if(cardBit2) cardNumber += 2;
00022         if(cardBit3) cardNumber += 4;
00023         if(cardBit4) cardNumber += 8;
00024         if(cardBit5) cardNumber += 16;
00025         if(cardBit6) cardNumber += 32;
00026         
00027         return cardNumber;  
00028     }