main.cpp

00001 #include "mbed.h"
00002 
00003 //Global objects
00004 BusOut binaryOutput(D5, D6, D7);
00005 DigitalIn SW1(D4);
00006 
00007 //Function prototypes
00008 void waitForButtonPress();
00009 
00010 //Main function
00011 int main() {
00012 
00013     //Create a variable to hold the bit pattern
00014     unsigned int u;
00015 
00016     //Flash LED's to indicate the code is running
00017     binaryOutput = 7;
00018     wait(0.5);
00019     binaryOutput = 0;
00020 
00021     //Main Loop
00022     while(1) {
00023         
00024         u = 0;             //Set initial value
00025         binaryOutput = u;  //Show binary on LED's
00026         waitForButtonPress();   //Call function      
00027   
00028         //Here is the first - use | to set bit 1 
00029         u = u | 2;        //OR with binary 010
00030         binaryOutput = u; 
00031         waitForButtonPress();   
00032                                
00033         //Modify u with the | to set bit 2
00034         //WRITE CODE HERE 
00035 
00036         binaryOutput = u;   
00037         waitForButtonPress();                           
00038 
00039 
00040         //Modify u with the | to set bit 0
00041         //WRITE CODE HERE 
00042 
00043         binaryOutput = u;   
00044         waitForButtonPress();   
00045         
00046     } //end while(1)
00047 } //end main
00048 
00049 //This is known as a C function.
00050 //This saves a lot of code repetition
00051 void waitForButtonPress() {
00052     while (SW1 == 0);
00053     wait(0.25);
00054     while (SW1 == 1);
00055 }